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{"parentUuid":"04be3a76-c064-4f08-afeb-10cd0eb74ec8","isSidechain":true,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","agentId":"a7e7fd6","slug":"purrfect-soaring-sunbeam","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01Vy9THxTqfbcdiD4BJSqf2J","type":"tool_result","content":"     1→# FOSDEM Demo Guide: \"My Mainframe Runs Arch BTW\"\n     2→\n     3→## System Overview\n     4→\n     5→**Hardware**: IBM 8561 LT1 400 (IBM Z mainframe)\n     6→**Hypervisor**: z/VM 7.3.0\n     7→**Guest OS**: RHEL 9.6 (host) → KVM → Arch Linux s390x\n     8→**Architecture**: Native s390x execution via KVM\n     9→\n    10→## What You Actually Have\n    11→\n    12→Arch Linux running on real IBM mainframe hardware through KVM virtualization on z/VM. This is **legitimate mainframe execution** - KVM on s390x provides hardware-assisted virtualization, so Arch executes natively on the mainframe CPU.\n    13→\n    14→```\n    15→IBM Z Hardware (IBM 8561 LT1 400 - 145 CPUs)\n    16→└── LPAR \"SSI22\" (27 CPUs configured - hardware partitioning)\n    17→    └── z/VM 7.3.0 (hypervisor running in LPAR)\n    18→        └── z/VM Guest \"LOS0068E\" (RHEL 9.6)\n    19→            └── KVM: Arch Linux s390x (native execution)\n    20→```\n    21→\n    22→**Architecture Clarification:**\n    23→- **LPAR** (Logical Partition): Hardware-level partitioning of the physical mainframe\n    24→- **z/VM 7.3.0**: Hypervisor running in the LPAR, manages virtual machines\n    25→- **z/VM Guest**: RHEL 9.6 running as a guest under z/VM\n    26→- **KVM**: Arch Linux running in KVM inside the RHEL guest\n    27→\n    28→## Demo Commands\n    29→\n    30→### Access the Mainframe\n    31→```bash\n    32→ssh mainframe\n    33→```\n    34→\n    35→### Show Host System\n    36→```bash\n    37→cat /proc/sysinfo | grep -A 5 \"VM00\"\n    38→# Shows: z/VM 7.3.0\n    39→uname -a\n    40→# Shows: s390x architecture\n    41→```\n    42→\n    43→### Boot Arch Linux\n    44→```bash\n    45→sudo ~/boot-arch.sh\n    46→```\n    47→\n    48→### Inside Arch - Verification Commands\n    49→```bash\n    50→# Show it's really Arch\n    51→cat /etc/os-release\n    52→\n    53→# Show architecture\n    54→uname -a\n    55→# Output: Linux archlinux 6.18.6-arch1-1-s390x #1 SMP s390x GNU/Linux\n    56→\n    57→# Show disk space\n    58→df -h\n    59→\n    60→# Show available utilities (busybox)\n    61→busybox --list | wc -l\n    62→# 200+ utilities\n    63→\n    64→# Show system info\n    65→cat /proc/cpuinfo\n    66→free -h\n    67→```\n    68→\n    69→## Demo Script for FOSDEM\n    70→\n    71→### Opening (30 seconds)\n    72→\"I use Arch BTW... on an IBM mainframe. Let me show you.\"\n    73→\n    74→### Hardware Overview (1 minute)\n    75→```bash\n    76→ssh mainframe\n    77→cat /proc/sysinfo | head -30\n    78→```\n    79→\n    80→**Talk track:**\n    81→- Real IBM Z hardware (IBM 8561 LT1 400)\n    82→- 145 CPUs total, running under z/VM 7.3.0\n    83→- LPAR with 27 CPUs configured\n    84→- This is enterprise mainframe hardware\n    85→\n    86→### The Challenge (2 minutes)\n    87→**Talk track:**\n    88→- Arch Linux has no official s390x port\n    89→- Need to cross-compile kernel (x86_64 → s390x)\n    90→- Need to build userspace natively on s390x\n    91→- Hybrid build strategy required\n    92→\n    93→**Show on screen:**\n    94→```bash\n    95→# From your workstation\n    96→ls -lh boot/\n    97→# Shows: vmlinuz-linux (6.18.6-arch1 kernel), initramfs-linux.img\n    98→```\n    99→\n   100→### The Build Process (2 minutes)\n   101→**Talk track:**\n   102→- Kernel: Cross-compiled using Fedora containers with s390x-linux-gnu-gcc\n   103→- Initramfs: Modified mkinitcpio for cross-arch builds\n   104→- Busybox: Built natively on z/VM (static linking requires native compilation)\n   105→- systemd: Can be built natively post-installation\n   106→\n   107→**Show key files:**\n   108→```bash\n   109→# On workstation\n   110→cat arch-kernel/PKGBUILD | grep arch=\n   111→# Shows s390x architecture\n   112→\n   113→ls -lh boot/busybox-s390x-static\n   114→# 2.3MB static binary built on z/VM\n   115→```\n   116→\n   117→### The Boot (3 minutes - LIVE DEMO)\n   118→```bash\n   119→# On mainframe\n   120→sudo ~/boot-arch.sh\n   121→# Wait for boot (30-60 seconds)\n   122→\n   123→# Once booted\n   124→uname -a\n   125→cat /etc/os-release\n   126→df -h\n   127→busybox --list | head -20\n   128→```\n   129→\n   130→**Talk track:**\n   131→- Booting Arch Linux kernel 6.18.6-arch1\n   132→- Modified initramfs with s390x busybox\n   133→- Full Arch environment with 200+ utilities\n   134→- Running natively on mainframe CPU via KVM\n   135→\n   136→### Technical Deep Dive (4 minutes)\n   137→**Talk track:**\n   138→\n   139→**mkinitcpio Challenges:**\n   140→- Can't use x86_64 binaries in s390x initramfs\n   141→- Modified base hook to use static busybox\n   142→- All 60+ busybox applets included\n   143→- Fixed add_binary vs add_file handling\n   144→\n   145→**Kernel Requirements:**\n   146→- CONFIG_UNIX=y (systemd needs AF_UNIX sockets)\n   147→- CONFIG_KMOD=y (kernel module loading)\n   148→- s390x-specific drivers: DASD, QETH, channel I/O\n   149→\n   150→**Busybox Static Linking:**\n   151→- Must be built natively on s390x\n   152→- Cross-compilation produces broken static binaries\n   153→- Used z/VM RHEL system for native builds\n   154→\n   155→### System Demo (2 minutes)\n   156→```bash\n   157→# Show it works\n   158→ls /\n   159→cat /root/README.txt\n   160→mount\n   161→ps aux\n   162→```\n   163→\n   164→**Show practical usage:**\n   165→```bash\n   166→# Can use standard Linux tools\n   167→ls -la /etc\n   168→cat /etc/hostname\n   169→# archlinux-zvm\n   170→\n   171→# Networking would work (if configured)\n   172→# Package management (future work)\n   173→```\n   174→\n   175→### Wrap Up (1 minute)\n   176→**Talk track:**\n   177→- Full Arch Linux on IBM mainframe\n   178→- Hybrid build strategy (cross + native)\n   179→- Real s390x execution via KVM\n   180→- Demonstrates modern Linux distro portability\n   181→- More distros should support s390x!\n   182→\n   183→**Closing line:**\n   184→\"My mainframe runs Arch BTW. Your move, Gentoo users.\"\n   185→\n   186→## Quick Verification Script\n   187→\n   188→Create this for fast demo:\n   189→```bash\n   190→#!/bin/bash\n   191→# demo-verify.sh\n   192→\n   193→echo \"=== IBM Z Mainframe - Arch Linux Demo ===\"\n   194→echo \"\"\n   195→echo \"Hardware:\"\n   196→cat /proc/sysinfo | grep -E \"Type:|Model:|VM00 Name:|VM00 Control\"\n   197→echo \"\"\n   198→echo \"Host System:\"\n   199→uname -a\n   200→echo \"\"\n   201→echo \"Booting Arch Linux...\"\n   202→sudo ~/boot-arch.sh\n   203→```\n   204→\n   205→## Demo Tips\n   206→\n   207→### Before Demo\n   208→1. Test the full flow 2-3 times\n   209→2. Have terminal ready with proper font size (visible on projector)\n   210→3. Pre-connect to mainframe to save time\n   211→4. Have backup slides if live demo fails\n   212→\n   213→### During Demo\n   214→1. Explain what you're doing before typing\n   215→2. Let boot messages scroll (shows real boot process)\n   216→3. Point out key messages: \"z/VM guest\", \"s390x\", \"Arch Linux\"\n   217→4. Have prepared commands ready to paste\n   218→\n   219→### What to Show\n   220→- **Architecture verification**: `uname -m` → s390x\n   221→- **OS verification**: `cat /etc/os-release` → Arch Linux\n   222→- **Real execution**: Show it's not just a container\n   223→- **Functionality**: Demonstrate working commands\n   224→\n   225→### What to Avoid\n   226→- Don't get bogged down in build details (save for Q&A)\n   227→- Don't show failed attempts (have working system ready)\n   228→- Don't apologize for QEMU/KVM (it's legitimate virtualization)\n   229→\n   230→## Q&A Preparation\n   231→\n   232→**Q: Why use KVM instead of bare metal?**\n   233→A: Safer for testing, RHEL still available, KVM on s390x is hardware-assisted native execution.\n   234→\n   235→**Q: Can you run systemd?**\n   236→A: Yes, we built systemd natively. Current demo uses busybox for simplicity.\n   237→\n   238→**Q: Why Arch?**\n   239→A: Rolling release, minimal base, good for demonstrating distro porting challenges.\n   240→\n   241→**Q: Performance?**\n   242→A: Native s390x execution via KVM, no performance penalty vs bare metal.\n   243→\n   244→**Q: Can I try this?**\n   245→A: GitHub repo has full build instructions, IBM LinuxONE Community Cloud offers free s390x access.\n   246→\n   247→**Q: Will this be in AUR?**\n   248→A: Future work - need to set up s390x package repositories first.\n   249→\n   250→## Files for Demo\n   251→\n   252→**On Mainframe:**\n   253→- `~/boot-arch.sh` - Boot script\n   254→- `~/arch-disk.img` - 20GB Arch installation\n   255→- `~/vmlinuz-linux` - Arch kernel\n   256→- `~/initramfs-linux.img` - Modified initramfs\n   257→\n   258→**On Workstation (to show):**\n   259→- `boot/` - Built artifacts\n   260→- `arch-kernel/` - Kernel PKGBUILD\n   261→- `scripts/build-arch-kernel.sh` - Build process\n   262→- `mkinitcpio-source/` - Modified mkinitcpio\n   263→\n   264→## Success Metrics\n   265→\n   266→After demo, audience should understand:\n   267→1. Arch Linux CAN run on mainframes\n   268→2. Hybrid build strategy (cross + native) works\n   269→3. Modern distros are portable with effort\n   270→4. s390x is still relevant and accessible\n   271→\n   272→## Backup Plan\n   273→\n   274→If live demo fails:\n   275→1. Have screenshots/recording ready\n   276→2. Show the build process instead\n   277→3. Talk through architecture and challenges\n   278→4. Show code and explain the port\n   279→\n   280→## Post-Demo\n   281→\n   282→**GitHub Repository:**\n   283→- Full source code\n   284→- Build instructions\n   285→- Documentation\n   286→- FOSDEM talk slides\n   287→\n   288→**Follow-up:**\n   289→- Blog post with detailed technical writeup\n   290→- AUR package (future)\n   291→- Contribute to Arch s390x support\n   292→\n   293→---\n   294→\n   295→**MY MAINFRAME RUNS ARCH BTW!**\n   296→\n\n<system-reminder>\nWhenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.\n</system-reminder>\n"}]},"uuid":"e94dab2e-6803-4fb5-91fa-f329a6259d61","timestamp":"2026-01-28T09:33:36.991Z","sourceToolAssistantUUID":"04be3a76-c064-4f08-afeb-10cd0eb74ec8"}
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{"parentUuid":"25daf9e9-340b-476f-a57b-88e80c3cc2b6","isSidechain":true,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","agentId":"a7e7fd6","slug":"purrfect-soaring-sunbeam","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_016CHKY7XPYf9GEaVPjnDHgz","type":"tool_result","content":"     1→---\n     2→title: \"my mainframe runs arch btw\"\n     3→subtitle: \"porting Arch Linux to IBM s390x\"\n     4→author: \"Josephine Pfeiffer\"\n     5→date: \"FOSDEM 2026\"\n     6→---\n     7→\n     8→## the premise\n     9→\n    10→I use Arch btw.\n    11→\n    12→. . .\n    13→\n    14→on an IBM mainframe.\n    15→\n    16→. . .\n    17→\n    18→an architecture lineage from 1964.\n    19→\n    20→---\n    21→\n    22→## s390x in 30 seconds\n    23→\n    24→- IBM Z / IBM LinuxONE\n    25→- 64-bit big-endian\n    26→- boots via **IPL**\n    27→- your bank runs on this\n    28→\n    29→---\n    30→\n    31→## \"why?\"\n    32→\n    33→---\n    34→\n    35→## \"why?\"\n    36→\n    37→\n    38→I thought it would be funny :p\n    39→\n    40→---\n    41→\n    42→## the problem\n    43→\n    44→Arch Linux assumes you build entirely on the target architecture.\n    45→\n    46→. . .\n    47→\n    48→I do not own a mainframe.\n    49→\n    50→. . .\n    51→\n    52→(but I have access to one)\n    53→\n    54→![](diagrams/mainframe.jpeg){ height=45% }\n    55→\n    56→---\n    57→\n    58→## the solution: a hybrid build\n    59→\n    60→![](diagrams/hybrid-build.png){ height=80% }\n    61→\n    62→---\n    63→\n    64→## step 1: the kernel\n    65→\n    66→cross-compile with `s390x-linux-gnu-gcc` in a Fedora container.\n    67→\n    68→```bash\n    69→make ARCH=s390 CROSS_COMPILE=s390x-linux-gnu- \\\n    70→     -j$(nproc) bzImage modules\n    71→```\n    72→\n    73→this part actually works fine.\n    74→\n    75→. . .\n    76→\n    77→this is the last time I will say that.\n    78→\n    79→---\n    80→\n    81→## step 2: busybox\n    82→\n    83→busybox must be statically linked for the initramfs.\n    84→\n    85→. . .\n    86→\n    87→reliably static-linking s390x binaries requires native compilation.\n    88→\n    89→. . .\n    90→\n    91→you need a real mainframe.\n    92→\n    93→```bash\n    94→$ ssh mainframe\n    95→$ make CONFIG_STATIC=y\n    96→$ scp busybox-s390x-static laptop:boot/\n    97→```\n    98→\n    99→2.3 MB. 60+ applets. built on hardware worth more than my apartment.\n   100→\n   101→::: notes\n   102→busybox is a single binary that provides stripped-down implementations of common Unix utilities (sh, cp, mount, etc). It replaces coreutils, util-linux, and a shell in a single statically-linked binary. The initramfs needs these tools before the real root filesystem is mounted, and busybox is the standard way to provide them in a minimal footprint. The \"ash\" applet in the later slide is busybox's Almquist shell implementation -- the shell that runs as /bin/sh in early boot.\n   103→:::\n   104→\n   105→---\n   106→\n   107→## step 3: mkinitcpio\n   108→\n   109→Arch's initramfs generator assumes it can *run* the binaries it packs.\n   110→\n   111→. . .\n   112→\n   113→it cannot run s390x binaries on x86_64.\n   114→\n   115→. . .\n   116→\n   117→```bash\n   118→# Can't do this on x86_64:\n   119→busybox --list\n   120→# So instead: hardcode all 60+ applet names\n   121→local busybox_applets=(\n   122→    \"[\" \"[[\" \"ash\" \"awk\" \"basename\" \"cat\"\n   123→    \"chmod\" \"cp\" \"dd\" \"df\" \"echo\" \"env\"\n   124→    # ... 50 more lines of this\n   125→)\n   126→```\n   127→\n   128→---\n   129→\n   130→## step 4: the CONFIG_UNIX incident\n   131→\n   132→systemd boots. systemd immediately dies.\n   133→\n   134→. . .\n   135→\n   136→hours later:\n   137→\n   138→```bash\n   139→CONFIG_UNIX=y\n   140→# AF_UNIX sockets. systemd needs these.\n   141→```\n   142→\n   143→---\n   144→\n   145→## the boot sequence\n   146→\n   147→![](diagrams/boot-sequence.png){ width=100% }\n   148→\n   149→total system image: **11 MB** -- smaller than most Electron apps.\n   150→\n   151→---\n   152→\n   153→## it works\n   154→\n   155→```bash\n   156→$ uname -a\n   157→Linux archlinux 6.18.6-arch1-1-s390x #1 SMP s390x GNU/Linux\n   158→\n   159→$ cat /etc/os-release\n   160→NAME=\"Arch Linux\"\n   161→PRETTY_NAME=\"Arch Linux\"\n   162→\n   163→$ busybox | head -1\n   164→BusyBox v1.37.0 (s390x) multi-call binary.\n   165→\n   166→$ systemctl status\n   167→  State: running\n   168→  Units: 12 loaded\n   169→```\n   170→\n   171→---\n   172→\n   173→## what I learned\n   174→\n   175→- cross-compilation has hard limits -- sometimes you need the real hardware\n   176→- distribution tooling has architecture assumptions everywhere\n   177→- `CONFIG_UNIX=y`\n   178→- the s390x boot process is fascinating and completely alien\n   179→\n   180→---\n   181→\n   182→## Arch Linux on s390x\n   183→\n   184→**working today:**\n   185→\n   186→- kernel, initramfs, busybox, systemd\n   187→- full boot to systemd shell\n   188→- QEMU emulation + real z/VM hardware\n   189→\n   190→**next:**\n   191→\n   192→- pacman and makepkg for s390x\n   193→- pacstrap and base packages\n   194→- convince the Arch community this is not a joke\n   195→\n   196→---\n   197→\n   198→## thank you\n   199→\n   200→github.com/pfeifferj/archlinux-s390x\n   201→\n\n<system-reminder>\nWhenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.\n</system-reminder>\n"}]},"uuid":"9cbab0cb-661a-4e8f-a13c-bcd800a1b7cc","timestamp":"2026-01-28T09:33:36.997Z","sourceToolAssistantUUID":"25daf9e9-340b-476f-a57b-88e80c3cc2b6"}
{"parentUuid":"7c92581a-d200-4fb2-a655-adc21f7f57b1","isSidechain":true,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","agentId":"a7e7fd6","slug":"purrfect-soaring-sunbeam","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01KoDbGfARamJVTxKNkRg7js","type":"tool_result","content":"     1→# Speaker Script: My Mainframe Runs Arch BTW\n     2→\n     3→Total time: ~256 seconds. Timings are cumulative.\n     4→\n     5→---\n     6→\n     7→## Slide 1: Title [0:00 - 0:08]\n     8→\n     9→*[Walk on, click to first slide.]*\n    10→\n    11→Hi, I'm Josie. This talk is about Arch Linux on an IBM mainframe.\n    12→\n    13→---\n    14→\n    15→## Slide 2: The Premise [0:08 - 0:25]\n    16→\n    17→I use Arch btw.\n    18→\n    19→*[pause for recognition]*\n    20→\n    21→On an IBM mainframe.\n    22→\n    23→*[pause]*\n    24→\n    25→An architecture lineage from 1964. IBM System/360, now z/Architecture.\n    26→The machine your bank still runs its core software on. That one.\n    27→\n    28→---\n    29→\n    30→## Slide 3: s390x in 30 seconds [0:25 - 0:50]\n    31→\n    32→Quick primer. s390x is IBM Z, also branded LinuxONE. It's 64-bit,\n    33→big-endian -- basically the last big-endian architecture anyone still\n    34→manufactures. It doesn't boot, it does IPL -- Initial Program Load.\n    35→Storage isn't a disk, it's DASD. Networking is QETH -- QDIO Ethernet, because apparently regular\n    36→Ethernet wasn't complicated enough. Your bank runs on this hardware. Possibly your government too.\n    37→\n    38→---\n    39→\n    40→## Slide 4: \"Why?\" [0:50 - 1:00]\n    41→\n    42→*[Click once, blank \"Why?\" appears. Let it sit for a beat.]*\n    43→\n    44→Because nobody said I could.\n    45→\n    46→*[Click]*\n    47→\n    48→Also nobody said I couldn't.\n    49→\n    50→---\n    51→\n    52→## Slide 5: The Problem [1:00 - 1:20]\n    53→\n    54→So here's the thing. Arch Linux assumes you're building on the same\n    55→architecture you're targeting. That makes sense -- most people are.\n    56→\n    57→I am not building on a mainframe. I do not own a mainframe. I am\n    58→building on a laptop that cost roughly one millionth of what a mainframe\n    59→costs.\n    60→\n    61→---\n    62→\n    63→## Slide 6: The Hybrid Build [1:20 - 1:50]\n    64→\n    65→The solution is a hybrid. On my x86 laptop, I run a Fedora container\n    66→with the s390x cross-compiler for the kernel. That works fine.\n    67→\n    68→For userspace -- busybox, systemd -- I SSH into an actual z/VM instance\n    69→running RHEL 9.6 on real mainframe hardware, build natively there, and\n    70→SCP the binaries back to my laptop. It's like a distributed build\n    71→system, except one node is an IBM Z and the other is a ThinkPad.\n    72→\n    73→---\n    74→\n    75→## Slide 7: The Kernel [1:50 - 2:02]\n    76→\n    77→The kernel cross-compiles cleanly with the s390x GCC toolchain.\n    78→Standard `make ARCH=s390 CROSS_COMPILE=s390x-linux-gnu-`. This is the\n    79→last step that just works. I want you to appreciate this moment.\n    80→\n    81→---\n    82→\n    83→## Slide 8: Busybox [2:02 - 2:22]\n    84→\n    85→Busybox needs to be statically linked for the initramfs. Static linking\n    86→for s390x cannot be cross-compiled -- glibc static archives for s390x\n    87→don't exist on Fedora. So you SSH to the mainframe, build it there, and\n    88→SCP back 2.3 megabytes of pure native s390x binary. Built on hardware\n    89→worth more than my apartment.\n    90→\n    91→---\n    92→\n    93→## Slide 9: mkinitcpio [2:22 - 2:42]\n    94→\n    95→Arch uses mkinitcpio to build the initramfs. It has a reasonable\n    96→assumption: it can execute the binaries it's packing. Except mine are\n    97→s390x and I'm on x86. So it can't run `busybox --list` to discover\n    98→applets. My fix: hardcode all 60-plus applet names in a bash array.\n    99→Elegant? No. Works? Yes.\n   100→\n   101→---\n   102→\n   103→## Slide 10: CONFIG_UNIX [2:42 - 3:02]\n   104→\n   105→Then systemd. It boots. It immediately dies. No error. No log.\n   106→Just... nothing. After a few hours of staring at QEMU output, I find\n   107→it: `CONFIG_UNIX=y`. AF_UNIX socket support. Systemd will not function\n   108→without it. It will also not tell you this. You just have to know.\n   109→\n   110→---\n   111→\n   112→## Slide 11: Boot Sequence [3:02 - 3:22]\n   113→\n   114→But once you know -- it works. IPL, kernel loads, initramfs unpacks,\n   115→busybox runs early userspace, mounts the root filesystem, switch_root,\n   116→systemd becomes PID 1.\n   117→\n   118→Total image size: 13 megabytes. Smaller than most Electron apps.\n   119→\n   120→---\n   121→\n   122→## Slide 12: It Works [3:22 - 3:40]\n   123→\n   124→`uname -a` says s390x. `/etc/os-release` says Arch Linux. Busybox and\n   125→systemd are running. This is a real, booting, functional Arch Linux\n   126→system on mainframe architecture.\n   127→\n   128→---\n   129→\n   130→## Slide 13: What I Learned [3:40 - 3:55]\n   131→\n   132→Cross-compilation has hard limits. Distribution tooling has architecture\n   133→assumptions everywhere. CONFIG_UNIX=y. And IBM actually gives away free\n   134→mainframe access through the LinuxONE Community Cloud, so you can do\n   135→this too.\n   136→\n   137→---\n   138→\n   139→## Slide 14: Status / Next [3:55 - 4:06]\n   140→\n   141→Everything through systemd boot works today -- on both QEMU emulation\n   142→and real z/VM hardware. Next steps are building pacman and makepkg for\n   143→s390x, then pacstrap and base packages, and convincing the Arch\n   144→community this is not a joke.\n   145→\n   146→---\n   147→\n   148→## Slide 15: Thank You [4:06 - 4:16]\n   149→\n   150→Thank you. The repo is on GitHub. And yes -- I use Arch btw.\n   151→\n   152→*[Nod. Walk off.]*\n   153→\n\n<system-reminder>\nWhenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.\n</system-reminder>\n"}]},"uuid":"57364a4d-3229-4843-b77f-5a89247f82ba","timestamp":"2026-01-28T09:33:36.997Z","sourceToolAssistantUUID":"7c92581a-d200-4fb2-a655-adc21f7f57b1"}
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This lightning talk chronicles the journey of porting Arch Linux to s390x (IBM Z), tackling challenges from cross-compilation nightmares to systemd boot sequences on hardware designed in the 1960s.\n     8→\n     9→We'll cover:\n    10→- Why port Arch to a mainframe architecture (because we can)\n    11→- The hybrid build strategy: cross-compiling kernels while building userspace natively on real z/VM hardware\n    12→- Adapting mkinitcpio for cross-architecture builds\n    13→- Making systemd play nice with channel I/O and DASD storage\n    14→- The satisfying moment when `uname -a` finally shows \"s390x\" in an Arch console\n    15→\n    16→This is a tale of modern Linux distribution engineering meeting enterprise computing, with lessons learned about toolchain limitations, the importance of CONFIG_UNIX=y, and why sometimes you really do need access to a mainframe.\n    17→\n    18→## Track\n    19→Lightning Talks\n    20→\n    21→## Duration\n    22→15 minutes\n    23→\n    24→## Speaker Bio\n    25→Josephine Pfeiffer is a systems engineer who enjoys bringing modern Linux distributions to unexpected places. When not porting operating systems to architectures they weren't designed for, she works on cloud infrastructure and pretends to understand EBCDIC.\n    26→\n    27→## Technical Level\n    28→Intermediate - assumes basic knowledge of Linux boot process and cross-compilation, but accessible to anyone interested in distribution development or mainframe computing.\n    29→\n    30→## Additional Notes\n    31→The project is fully open source and demonstrates real-world challenges in:\n    32→- Cross-architecture Linux distribution ports\n    33→- Hybrid build environments (cross-compilation + native builds)\n    34→- Adapting distribution tooling (pacman, mkinitcpio) for new architectures\n    35→- Mainframe-specific considerations (IPL boot, channel I/O, DASD)\n    36→\n    37→Live demo will show the full boot sequence from IPL through systemd startup on QEMU s390x emulation.\n    38→\n    39→---\n    40→\n    41→## Talk Outline (15 minutes)\n    42→\n    43→### Introduction (2 min)\n    44→- \"I use Arch BTW\" meets \"I run mainframes BTW\"\n    45→- Why s390x? IBM Z architecture overview\n    46→- Project goals: full Arch Linux on mainframe hardware\n    47→\n    48→### The Challenge (3 min)\n    49→- No existing s390x support in Arch infrastructure\n    50→- Cross-compilation vs native compilation tradeoffs\n    51→- Toolchain limitations and static linking requirements\n    52→- The initramfs problem: can't run x86_64 binaries on s390x\n    53→\n    54→### The Solution (5 min)\n    55→- Hybrid build strategy:\n    56→  - Cross-compile kernel on Fedora containers\n    57→  - Native compilation on z/VM (RHEL 9.6) for userspace\n    58→- Modified mkinitcpio for cross-arch builds\n    59→- Static busybox built natively (2.3MB of self-contained goodness)\n    60→- Systemd kernel requirements discovery (CONFIG_UNIX=y adventure)\n    61→\n    62→### Boot Sequence (3 min)\n    63→- IPL (Initial Program Load) - mainframe boot process\n    64→- Kernel loads with s390x drivers (DASD, QETH, channel I/O)\n    65→- Initramfs unpacks and runs busybox init\n    66→- switch_root to real filesystem\n    67→- systemd takes over as PID 1\n    68→- Live demo on QEMU s390x\n    69→\n    70→### Lessons Learned (2 min)\n    71→- Cross-compilation has limits (busybox static linking failure)\n    72→- Distribution tooling assumptions (mkinitcpio expects same arch)\n    73→- Kernel config matters (systemd dependencies)\n    74→- Mainframes are cool and more accessible than you think\n    75→\n    76→### Conclusion (1 min)\n    77→- Project status: full systemd boot working\n    78→- Future: packaging for AUR, real hardware testing\n    79→- Call to action: more distros should support s390x\n    80→- Q&A\n    81→\n    82→---\n    83→\n    84→## Demo Plan\n    85→Quick QEMU s390x boot showing:\n    86→1. Kernel loading\n    87→2. Initramfs unpacking\n    88→3. systemd startup sequence\n    89→4. Login prompt on a mainframe (well, emulated)\n    90→5. `neofetch` showing Arch Linux on s390x\n    91→\n    92→Total demo time: ~60 seconds of actual boot, plus 30 seconds of glory\n    93→\n    94→---\n    95→\n    96→## Resources to Include\n    97→- GitHub repository link\n    98→- QEMU s390x setup instructions\n    99→- z/VM access options (IBM LinuxONE Community Cloud)\n   100→- Arch s390x package availability status\n   101→\n\n<system-reminder>\nWhenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.\n</system-reminder>\n"}]},"uuid":"f9a93ced-7b59-4bd1-8701-244528d5a157","timestamp":"2026-01-28T09:33:36.997Z","sourceToolAssistantUUID":"5a361d5c-9c4c-4043-9cdd-b05eec49f08d"}
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{"parentUuid":"132d53c9-f2fc-4ef2-ac4a-f38f916b2b93","isSidechain":true,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","agentId":"a7e7fd6","slug":"purrfect-soaring-sunbeam","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01J2XWvSJNXTwWrtFLEmM8PE","type":"tool_result","content":"     1→# Real z/VM Installation - Arch Linux s390x\n     2→\n     3→This guide walks through a **real installation** that will **replace your RHEL 9.6 system** with Arch Linux on the z/VM hardware.\n     4→\n     5→**WARNING: This will erase your current z/VM system!**\n     6→\n     7→## Pre-Installation Checklist\n     8→\n     9→- [ ] Backup important data from RHEL system\n    10→- [ ] Have console/terminal access to z/VM\n    11→- [ ] Know your DASD device (usually `/dev/dasda`)\n    12→- [ ] Network access to transfer files\n    13→- [ ] Ready to replace RHEL with Arch\n    14→\n    15→## Step 1: Backup Current System\n    16→\n    17→First, let's backup anything important from the current RHEL system:\n    18→\n    19→```bash\n    20→# SSH to current z/VM RHEL system\n    21→ssh linux1@148.100.77.9\n    22→\n    23→# Backup systemd build artifacts (if you want to keep them)\n    24→tar czf ~/systemd-backup-$(date +%Y%m%d).tar.gz \\\n    25→  /home/linux1/systemd-build \\\n    26→  /home/linux1/systemd-minimal \\\n    27→  2>/dev/null || true\n    28→\n    29→# Backup any other important files\n    30→tar czf ~/zvm-backup-$(date +%Y%m%d).tar.gz \\\n    31→  ~/.ssh \\\n    32→  ~/.bashrc \\\n    33→  ~/.profile \\\n    34→  2>/dev/null || true\n    35→\n    36→# Download backups to your local machine\n    37→# (From your workstation)\n    38→scp linux1@148.100.77.9:~/*backup*.tar.gz ~/backups/\n    39→```\n    40→\n    41→## Step 2: Transfer Arch Installation Files\n    42→\n    43→Transfer the Arch Linux installation files to z/VM:\n    44→\n    45→```bash\n    46→# From your workstation\n    47→cd ~/development/archlinuxarch-s390\n    48→\n    49→# Transfer kernel, initramfs, and root filesystem\n    50→scp boot/vmlinuz-linux linux1@148.100.77.9:~/\n    51→scp boot/initramfs-linux.img linux1@148.100.77.9:~/\n    52→scp boot/arch-s390x-install.img linux1@148.100.77.9:~/arch-rootfs.img\n    53→\n    54→# Verify transfer\n    55→ssh linux1@148.100.77.9 \"ls -lh vmlinuz-linux initramfs-linux.img arch-rootfs.img\"\n    56→```\n    57→\n    58→Expected output:\n    59→```\n    60→-rwxr-xr-x 1 linux1 linux1 6.1M ... vmlinuz-linux\n    61→-rw-r--r-- 1 linux1 linux1 5.0M ... initramfs-linux.img\n    62→-rw-r--r-- 1 linux1 linux1 500M ... arch-rootfs.img\n    63→```\n    64→\n    65→## Step 3: Identify DASD Disk\n    66→\n    67→On z/VM, identify your DASD storage device:\n    68→\n    69→```bash\n    70→# SSH to z/VM\n    71→ssh linux1@148.100.77.9\n    72→\n    73→# List DASD devices\n    74→lsdasd\n    75→\n    76→# Example output:\n    77→# 0.0.0100(ECKD) at ( 94:  0) is dasda      : active at blocksize: 4096, 600840 blocks, 2347 MB\n    78→\n    79→# Check current disk layout\n    80→fdisk -l /dev/dasda\n    81→\n    82→# Check what's currently using it\n    83→df -h\n    84→mount | grep dasda\n    85→```\n    86→\n    87→## Step 4: Prepare Installation Environment\n    88→\n    89→We'll use QEMU to boot the Arch installer, then install to the real DASD disk:\n    90→\n    91→```bash\n    92→# On z/VM, install QEMU if not present\n    93→sudo yum install -y qemu-system-s390x\n    94→\n    95→# Create a script to boot the installer with access to DASD\n    96→cat > boot-arch-installer.sh << 'EOF'\n    97→#!/bin/bash\n    98→# Boot Arch Linux installer with access to DASD\n    99→\n   100→# WARNING: This gives the installer access to /dev/dasda\n   101→# The installer can partition and format this disk\n   102→\n   103→qemu-system-s390x \\\n   104→  -M s390-ccw-virtio \\\n   105→  -m 2G \\\n   106→  -nographic \\\n   107→  -kernel vmlinuz-linux \\\n   108→  -initrd initramfs-linux.img \\\n   109→  -append \"root=/dev/vda rw console=ttyS0\" \\\n   110→  -drive file=arch-rootfs.img,if=none,id=drive0,format=raw \\\n   111→  -device virtio-blk-ccw,drive=drive0,devno=fe.0.0001 \\\n   112→  -drive file=/dev/dasda,if=none,id=dasd,format=raw,cache=none \\\n   113→  -device virtio-blk-ccw,drive=dasd,devno=fe.0.0002\n   114→\n   115→# To exit: Ctrl-A then X\n   116→EOF\n   117→\n   118→chmod +x boot-arch-installer.sh\n   119→```\n   120→\n   121→## Step 5: Boot Arch Installer and Install to DASD\n   122→\n   123→**POINT OF NO RETURN**: This will modify your DASD disk!\n   124→\n   125→```bash\n   126→# Boot the installer\n   127→sudo ./boot-arch-installer.sh\n   128→```\n   129→\n   130→Inside the Arch installer environment:\n   131→\n   132→```bash\n   133→# Verify you can see both disks\n   134→ls -l /dev/vd*\n   135→\n   136→# /dev/vda = Arch installer root filesystem (500MB)\n   137→# /dev/vdb = Your DASD disk (full size, e.g., 2.3GB)\n   138→\n   139→# Partition the DASD disk\n   140→fdisk /dev/vdb\n   141→\n   142→# Partitioning scheme:\n   143→# 1. Press 'n' for new partition\n   144→# 2. Press 'p' for primary\n   145→# 3. Press '1' for partition 1 (boot)\n   146→# 4. Press Enter for default start\n   147→# 5. Type '+512M' for 512MB boot partition\n   148→# 6. Press 'n' for new partition\n   149→# 7. Press 'p' for primary\n   150→# 8. Press '2' for partition 2 (root)\n   151→# 9. Press Enter for default start\n   152→# 10. Press Enter for default end (use remaining space)\n   153→# 11. Press 'w' to write changes\n   154→\n   155→# Format partitions\n   156→mkfs.ext4 /dev/vdb1  # boot partition\n   157→mkfs.ext4 /dev/vdb2  # root partition\n   158→\n   159→# Mount target filesystem\n   160→mkdir -p /mnt\n   161→mount /dev/vdb2 /mnt\n   162→mkdir -p /mnt/boot\n   163→mount /dev/vdb1 /mnt/boot\n   164→\n   165→# Install base system\n   166→echo \"Installing Arch Linux to DASD...\"\n   167→\n   168→# Copy all system files\n   169→cp -a /bin /sbin /etc /usr /lib /mnt/\n   170→mkdir -p /mnt/{proc,sys,dev,tmp,var,run,home,root,opt,lib64}\n   171→\n   172→# Copy kernel and initramfs to boot partition\n   173→cp /vmlinuz-linux /mnt/boot/ 2>/dev/null || true\n   174→cp /initramfs-linux.img /mnt/boot/ 2>/dev/null || true\n   175→\n   176→# If kernel/initramfs aren't in root, download them\n   177→# (Keep another SSH session open to your workstation)\n   178→# From workstation: scp boot/vmlinuz-linux linux1@148.100.77.9:/tmp/\n   179→# From installer: cp /tmp/vmlinuz-linux /mnt/boot/\n   180→\n   181→# Configure fstab for DASD\n   182→cat > /mnt/etc/fstab << 'FSTAB_EOF'\n   183→# Arch Linux s390x fstab for DASD installation\n   184→/dev/vdb2  /      ext4  defaults,relatime  0 1\n   185→/dev/vdb1  /boot  ext4  defaults           0 2\n   186→proc       /proc  proc  defaults           0 0\n   187→sysfs      /sys   sysfs defaults           0 0\n   188→devtmpfs   /dev   devtmpfs defaults       0 0\n   189→tmpfs      /tmp   tmpfs defaults           0 0\n   190→FSTAB_EOF\n   191→\n   192→# Set hostname\n   193→echo \"archlinux-zvm\" > /mnt/etc/hostname\n   194→\n   195→# Update hosts\n   196→cat > /mnt/etc/hosts << 'HOSTS_EOF'\n   197→127.0.0.1   localhost\n   198→::1         localhost\n   199→127.0.1.1   archlinux-zvm.localdomain archlinux-zvm\n   200→HOSTS_EOF\n   201→\n   202→# Clear root password for easy first login\n   203→# (Set a password later after first boot)\n   204→sed -i 's/^root:.*$/root::19797:0:99999:7:::/' /mnt/etc/shadow\n   205→\n   206→# Create a boot script for easy rebooting\n   207→cat > /mnt/root/boot-from-dasd.sh << 'BOOT_EOF'\n   208→#!/bin/sh\n   209→# Boot directly from DASD (for testing before IPL setup)\n   210→\n   211→qemu-system-s390x \\\n   212→  -M s390-ccw-virtio \\\n   213→  -m 2G \\\n   214→  -nographic \\\n   215→  -kernel /boot/vmlinuz-linux \\\n   216→  -initrd /boot/initramfs-linux.img \\\n   217→  -append \"root=/dev/vda rw console=ttyS0\" \\\n   218→  -drive file=/dev/dasda,if=none,id=dasd,format=raw,cache=none \\\n   219→  -device virtio-blk-ccw,drive=dasd,devno=fe.0.0001\n   220→BOOT_EOF\n   221→\n   222→chmod +x /mnt/root/boot-from-dasd.sh\n   223→\n   224→# Unmount filesystems\n   225→umount /mnt/boot\n   226→umount /mnt\n   227→\n   228→echo \"\"\n   229→echo \"=========================================\"\n   230→echo \"Installation Complete!\"\n   231→echo \"=========================================\"\n   232→echo \"\"\n   233→echo \"Arch Linux has been installed to /dev/vdb (DASD)\"\n   234→echo \"\"\n   235→echo \"To exit: Press Ctrl-A then X\"\n   236→echo \"\"\n   237→```\n   238→\n   239→## Step 6: Exit and Test Boot\n   240→\n   241→Exit QEMU (Ctrl-A then X), then test booting from the installed DASD:\n   242→\n   243→```bash\n   244→# On z/VM RHEL system, create boot script\n   245→cat > ~/boot-arch-from-dasd.sh << 'EOF'\n   246→#!/bin/bash\n   247→# Boot Arch Linux from DASD installation\n   248→\n   249→sudo qemu-system-s390x \\\n   250→  -M s390-ccw-virtio \\\n   251→  -m 2G \\\n   252→  -nographic \\\n   253→  -kernel ~/vmlinuz-linux \\\n   254→  -initrd ~/initramfs-linux.img \\\n   255→  -append \"root=/dev/vda2 rw console=ttyS0\" \\\n   256→  -drive file=/dev/dasda,if=none,id=dasd,format=raw,cache=none \\\n   257→  -device virtio-blk-ccw,drive=dasd,devno=fe.0.0001\n   258→EOF\n   259→\n   260→chmod +x ~/boot-arch-from-dasd.sh\n   261→\n   262→# Test boot\n   263→sudo ./boot-arch-from-dasd.sh\n   264→```\n   265→\n   266→If it boots successfully, you should see:\n   267→```\n   268→Welcome to Arch Linux s390x!\n   269→Architecture: s390x\n   270→Kernel: 6.18.6-arch1-1\n   271→...\n   272→archlinux-zvm login:\n   273→```\n   274→\n   275→Login as `root` (no password needed initially).\n   276→\n   277→## Step 7: Configure Native Boot (IPL)\n   278→\n   279→To boot natively without QEMU, we need to set up IPL (Initial Program Load).\n   280→\n   281→**Option A: Continue using QEMU** (easier, boots from RHEL)\n   282→- Keep the `boot-arch-from-dasd.sh` script\n   283→- Boot Arch whenever needed with that script\n   284→- RHEL still exists, you just boot into Arch via QEMU\n   285→\n   286→**Option B: Replace RHEL completely with IPL** (advanced)\n   287→\n   288→This requires:\n   289→1. Installing a bootloader to DASD (zipl for s390x)\n   290→2. Configuring z/VM to IPL from DASD\n   291→3. This is complex and requires z/VM configuration access\n   292→\n   293→For now, **Option A is recommended** - you can boot Arch via QEMU while keeping RHEL as the base system for convenience.\n   294→\n   295→## Step 8: Post-Installation\n   296→\n   297→Once booted into Arch:\n   298→\n   299→```bash\n   300→# Set a root password\n   301→passwd root\n   302→\n   303→# Check system info\n   304→uname -a\n   305→cat /etc/os-release\n   306→df -h\n   307→free -h\n   308→\n   309→# Network configuration (if needed)\n   310→# Configure based on your z/VM network setup\n   311→\n   312→# Build systemd natively (optional)\n   313→/root/build-systemd.sh\n   314→```\n   315→\n   316→## Verification Checklist\n   317→\n   318→- [ ] Arch boots from DASD\n   319→- [ ] `uname -m` shows \"s390x\"\n   320→- [ ] `/etc/os-release` shows \"Arch Linux\"\n   321→- [ ] Can login as root\n   322→- [ ] Filesystem is writable (`touch /test`)\n   323→- [ ] Boot partition mounted (`ls /boot`)\n   324→\n   325→## Rollback Plan\n   326→\n   327→If something goes wrong:\n   328→\n   329→1. **RHEL is still bootable** (by default z/VM IPL)\n   330→2. Your DASD has Arch installed, but RHEL boots normally\n   331→3. To restore DASD: Just repartition and reinstall RHEL\n   332→\n   333→Your RHEL system files are unchanged unless you specifically configure z/VM to IPL from the DASD partition.\n   334→\n   335→## Architecture Overview\n   336→\n   337→```\n   338→z/VM System:\n   339→├── RHEL 9.6 (default boot, on system disk)\n   340→│   └── QEMU boots Arch from DASD\n   341→└── DASD Disk (/dev/dasda)\n   342→    ├── /dev/dasda1 - Arch boot partition (512MB)\n   343→    └── /dev/dasda2 - Arch root filesystem (remaining space)\n   344→```\n   345→\n   346→You boot RHEL normally, then run the script to boot Arch via QEMU with direct DASD access.\n   347→\n   348→## Next Steps\n   349→\n   350→1. Use Arch regularly via the boot script\n   351→2. Build systemd natively on Arch\n   352→3. Set up package repositories\n   353→4. Configure for production use\n   354→5. (Advanced) Set up true IPL boot to eliminate QEMU layer\n   355→\n   356→## Success!\n   357→\n   358→You now have Arch Linux running on IBM z/VM mainframe hardware!\n   359→\n   360→**My mainframe runs Arch BTW!**\n   361→\n\n<system-reminder>\nWhenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.\n</system-reminder>\n"}]},"uuid":"3173d358-ef9c-4f70-a297-df4672f644a8","timestamp":"2026-01-28T09:33:40.312Z","sourceToolAssistantUUID":"132d53c9-f2fc-4ef2-ac4a-f38f916b2b93"}
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{"parentUuid":"898e6227-5794-48e1-870e-b88412d0af0e","isSidechain":true,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","agentId":"a7e7fd6","slug":"purrfect-soaring-sunbeam","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01AL7fTxSxfhHb891YbfQ9h4","type":"tool_result","content":"     1→# Arch Linux s390x - Real Installation Quick Start\n     2→\n     3→## TL;DR - Install Commands\n     4→\n     5→```bash\n     6→# On your workstation\n     7→cd ~/development/archlinuxarch-s390\n     8→\n     9→# Transfer files\n    10→scp boot/vmlinuz-linux linux1@148.100.77.9:~/\n    11→scp boot/initramfs-linux.img linux1@148.100.77.9:~/\n    12→scp boot/arch-s390x-install.img linux1@148.100.77.9:~/arch-rootfs.img\n    13→\n    14→# SSH to z/VM\n    15→ssh linux1@148.100.77.9\n    16→\n    17→# On z/VM - Install QEMU and create installer\n    18→sudo yum install -y qemu-system-s390x\n    19→\n    20→cat > ~/install-arch.sh << 'EOF'\n    21→#!/bin/bash\n    22→sudo qemu-system-s390x \\\n    23→  -M s390-ccw-virtio -m 2G -nographic \\\n    24→  -kernel ~/vmlinuz-linux -initrd ~/initramfs-linux.img \\\n    25→  -append \"root=/dev/vda rw console=ttyS0\" \\\n    26→  -drive file=arch-rootfs.img,if=none,id=drive0,format=raw \\\n    27→  -device virtio-blk-ccw,drive=drive0,devno=fe.0.0001 \\\n    28→  -drive file=/dev/dasda,if=none,id=dasd,format=raw,cache=none \\\n    29→  -device virtio-blk-ccw,drive=dasd,devno=fe.0.0002\n    30→EOF\n    31→\n    32→chmod +x ~/install-arch.sh\n    33→sudo ~/install-arch.sh\n    34→\n    35→# Inside Arch installer - Install to DASD\n    36→fdisk /dev/vdb  # n,p,1,Enter,+512M,n,p,2,Enter,Enter,w\n    37→mkfs.ext4 /dev/vdb1\n    38→mkfs.ext4 /dev/vdb2\n    39→mkdir -p /mnt && mount /dev/vdb2 /mnt && mkdir -p /mnt/boot && mount /dev/vdb1 /mnt/boot\n    40→cp -a /bin /sbin /etc /usr /lib /mnt/\n    41→mkdir -p /mnt/{proc,sys,dev,tmp,var,run,home,root,opt,lib64}\n    42→cat > /mnt/etc/fstab << 'FSTAB'\n    43→/dev/vdb2  /      ext4  defaults,relatime  0 1\n    44→/dev/vdb1  /boot  ext4  defaults           0 2\n    45→FSTAB\n    46→echo \"archlinux-zvm\" > /mnt/etc/hostname\n    47→sed -i 's/^root:.*$/root::19797:0:99999:7:::/' /mnt/etc/shadow\n    48→umount /mnt/boot && umount /mnt\n    49→# Ctrl-A then X to exit\n    50→\n    51→# Back on z/VM - Create boot script\n    52→cat > ~/boot-arch.sh << 'EOF'\n    53→#!/bin/bash\n    54→sudo qemu-system-s390x \\\n    55→  -M s390-ccw-virtio -m 2G -nographic \\\n    56→  -kernel ~/vmlinuz-linux -initrd ~/initramfs-linux.img \\\n    57→  -append \"root=/dev/vda2 rw console=ttyS0\" \\\n    58→  -drive file=/dev/dasda,if=none,id=dasd,format=raw,cache=none \\\n    59→  -device virtio-blk-ccw,drive=dasd,devno=fe.0.0001\n    60→EOF\n    61→\n    62→chmod +x ~/boot-arch.sh\n    63→sudo ~/boot-arch.sh\n    64→\n    65→# You should now be in Arch Linux on z/VM!\n    66→# Login as root (no password), then run: passwd root\n    67→```\n    68→\n    69→## What This Does\n    70→\n    71→1. Keeps RHEL 9.6 as base system (safe, can rollback)\n    72→2. Installs Arch to DASD disk `/dev/dasda`\n    73→3. Boot Arch via QEMU from RHEL\n    74→4. Full Arch environment with busybox userland\n    75→\n    76→## Files Available\n    77→\n    78→- `install-now.sh` - Interactive installer guide\n    79→- `REAL_INSTALL_GUIDE.md` - Complete detailed guide\n    80→- `ZVM_INSTALLATION.md` - Alternative installation methods\n    81→- `ZVM_INSTALL_READY.md` - Status and overview\n    82→\n    83→## Post-Install\n    84→\n    85→```bash\n    86→# Set root password\n    87→passwd root\n    88→\n    89→# Verify installation\n    90→uname -a                    # Should show s390x\n    91→cat /etc/os-release         # Should show Arch Linux\n    92→df -h                       # Check mounted filesystems\n    93→busybox --list              # See available commands\n    94→\n    95→# Build systemd (optional)\n    96→/root/build-systemd.sh\n    97→```\n    98→\n    99→## Rollback\n   100→\n   101→Just reboot into RHEL normally. Your RHEL system is unchanged.\n   102→\n   103→## Success!\n   104→\n   105→**MY MAINFRAME RUNS ARCH BTW!**\n   106→\n\n<system-reminder>\nWhenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.\n</system-reminder>\n"}]},"uuid":"060535ea-b413-42a7-bca2-26e8e9808bdb","timestamp":"2026-01-28T09:33:40.320Z","sourceToolAssistantUUID":"898e6227-5794-48e1-870e-b88412d0af0e"}
{"parentUuid":"d2f562c0-5d99-4d90-ac4b-7ea42edd9a34","isSidechain":true,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","agentId":"a7e7fd6","slug":"purrfect-soaring-sunbeam","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_018eso9FBaErdUxJ6Nx8mbGG","type":"tool_result","content":"     1→# Rootfs Build Moved to z/VM\n     2→\n     3→## Problem\n     4→\n     5→The rootfs was previously built locally on x86_64. The `create-rootfs.sh` script\n     6→called `sudo chroot /bin/busybox --install -s` to install busybox applet symlinks,\n     7→but since the busybox binary is s390x, the chroot silently failed on x86_64.\n     8→\n     9→This meant only 5 hardcoded critical applets (sh, mount, umount, switch_root, init)\n    10→were available. Standard commands like `uname`, `cat`, `ls`, `grep` etc. were missing\n    11→from the rootfs.\n    12→\n    13→## Solution\n    14→\n    15→New script `scripts/build-rootfs-zvm.sh` builds the rootfs image natively on z/VM\n    16→where `busybox --install -s` runs on real s390x hardware. This creates all 398 applet\n    17→symlinks across `/bin`, `/sbin`, `/usr/bin`, `/usr/sbin`.\n    18→\n    19→### Build flow\n    20→\n    21→1. Upload busybox binary, systemd tarball, and build script to z/VM\n    22→2. Script creates ext4 image, mounts it, populates directory structure\n    23→3. `chroot /bin/busybox --install -s` runs natively -- all applets installed\n    24→4. Systemd extracted from tarball, auto-login services configured\n    25→5. Image unmounted and scp'd back to local machine\n    26→\n    27→### Running it\n    28→\n    29→```bash\n    30→# Upload artifacts\n    31→scp -i zvm.pem boot/busybox-s390x-static linux1@$ZVM_HOST:~/busybox-s390x-static\n    32→scp -i zvm.pem output/systemd-minimal-s390x.tar.gz linux1@$ZVM_HOST:~/systemd-minimal-s390x.tar.gz\n    33→scp -i zvm.pem scripts/build-rootfs-zvm.sh linux1@$ZVM_HOST:~/build-rootfs-zvm.sh\n    34→\n    35→# Build on z/VM\n    36→ssh -i zvm.pem linux1@$ZVM_HOST \"chmod +x ~/build-rootfs-zvm.sh && ~/build-rootfs-zvm.sh\"\n    37→\n    38→# Pull image back\n    39→scp -i zvm.pem linux1@$ZVM_HOST:~/rootfs-s390x.img boot/rootfs-s390x.img\n    40→```\n    41→\n    42→### Other fixes in this session\n    43→\n    44→- **Containerfile**: Fedora 43 uses dnf5 which dropped `dnf config-manager --set-enabled`.\n    45→  Replaced the `dnf-plugins-core` install with a direct\n    46→  `sed -i 's/enabled=0/enabled=1/' /etc/yum.repos.d/fedora-updates-testing.repo`.\n    47→\n    48→- **PATH in rootfs**: Busybox `--install -s` puts applets in `/usr/bin` and `/usr/sbin`\n    49→  but the default shell PATH was only `/bin:/sbin`. Added `/etc/profile` with full PATH\n    50→  and `Environment=PATH=...` in the auto-login systemd services.\n    51→\n    52→- **z/VM SSH key**: The old `zvm.pem` (OpenSSH format) broke with OpenSSL 3.6 on Arch\n    53→  (`error in libcrypto`). Replaced with RSA PEM format key from new z/VM instance at\n    54→  148.100.85.59 (previous was 148.100.77.9).\n    55→\n    56→- **asciinema v3 upload**: asciinema.org returns HTTP 500 on v3 format uploads.\n    57→  The `record-demo.py` script writes v2 format directly which uploads fine.\n    58→\n\n<system-reminder>\nWhenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.\n</system-reminder>\n"}]},"uuid":"aad7e315-16e9-40ec-a769-95537ddaca89","timestamp":"2026-01-28T09:33:40.320Z","sourceToolAssistantUUID":"d2f562c0-5d99-4d90-ac4b-7ea42edd9a34"}
{"parentUuid":"f0c9d908-f852-4617-9562-8481d2246aac","isSidechain":true,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","agentId":"a7e7fd6","slug":"purrfect-soaring-sunbeam","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01LApXAQkFpgHH1BqKJcwjhv","type":"tool_result","content":"     1→# Installing Arch Linux s390x on z/VM\n     2→\n     3→This guide walks through installing Arch Linux on IBM z/VM hardware, replacing the existing RHEL 9.6 system.\n     4→\n     5→## Prerequisites\n     6→\n     7→- Access to z/VM system (148.100.77.9)\n     8→- SSH key configured in `.env`\n     9→- Built Arch Linux installation image (kernel, initramfs, rootfs)\n    10→\n    11→## Quick Start\n    12→\n    13→```bash\n    14→# 1. Build the installation image (if not already done)\n    15→make all\n    16→./scripts/install-arch-to-zvm.sh\n    17→\n    18→# 2. Deploy to z/VM\n    19→chmod +x scripts/deploy-to-zvm.sh\n    20→./scripts/deploy-to-zvm.sh\n    21→```\n    22→\n    23→## Installation Methods\n    24→\n    25→### Method 1: Test Boot with QEMU (Recommended First Step)\n    26→\n    27→This method boots Arch Linux in QEMU on the z/VM system without modifying the existing RHEL installation.\n    28→\n    29→1. Deploy files to z/VM:\n    30→   ```bash\n    31→   ./scripts/deploy-to-zvm.sh\n    32→   ```\n    33→\n    34→2. SSH to z/VM:\n    35→   ```bash\n    36→   ssh -i zvm.pem linux1@148.100.77.9\n    37→   ```\n    38→\n    39→3. Boot Arch in QEMU:\n    40→   ```bash\n    41→   qemu-system-s390x \\\n    42→     -M s390-ccw-virtio \\\n    43→     -m 2G \\\n    44→     -nographic \\\n    45→     -kernel vmlinuz-linux \\\n    46→     -initrd initramfs-linux.img \\\n    47→     -append \"root=/dev/vda rw console=ttyS0\" \\\n    48→     -drive file=arch-rootfs.img,if=none,id=drive0,format=raw \\\n    49→     -device virtio-blk-ccw,drive=drive0,devno=fe.0.0001\n    50→   ```\n    51→\n    52→4. You should see Arch Linux boot and land in a shell\n    53→\n    54→5. Verify it's working:\n    55→   ```bash\n    56→   cat /etc/os-release   # Should show \"Arch Linux\"\n    57→   uname -a              # Should show s390x architecture\n    58→   busybox --list        # See available commands\n    59→   ```\n    60→\n    61→6. Exit QEMU: Press `Ctrl-A` then `X`\n    62→\n    63→### Method 2: Install to DASD (Permanent Installation)\n    64→\n    65→This method installs Arch Linux directly to the z/VM DASD disk, replacing RHEL.\n    66→\n    67→**WARNING: This will erase your existing z/VM system!**\n    68→\n    69→#### Step 1: Backup Current System\n    70→\n    71→Before proceeding, backup any important data from the RHEL system.\n    72→\n    73→```bash\n    74→# SSH to z/VM\n    75→ssh -i zvm.pem linux1@148.100.77.9\n    76→\n    77→# Backup important files\n    78→tar czf backup-$(date +%Y%m%d).tar.gz /opt/arch-s390x /home/linux1\n    79→```\n    80→\n    81→#### Step 2: Identify Your DASD Disk\n    82→\n    83→```bash\n    84→# On the RHEL system, identify your DASD\n    85→lsdasd\n    86→# Example output: 0.0.0100(ECKD) at ( 94:  0) is dasda      : active at blocksize: 4096, 600840 blocks, 2347 MB\n    87→\n    88→# Check current disk layout\n    89→fdisk -l /dev/dasda\n    90→```\n    91→\n    92→#### Step 3: Boot Arch Installation Environment\n    93→\n    94→Option A: Using QEMU (safer):\n    95→```bash\n    96→# Create a larger disk for installation\n    97→qemu-img create -f raw arch-disk.img 10G\n    98→\n    99→# Boot with installation image AND target disk\n   100→qemu-system-s390x \\\n   101→  -M s390-ccw-virtio \\\n   102→  -m 2G \\\n   103→  -nographic \\\n   104→  -kernel vmlinuz-linux \\\n   105→  -initrd initramfs-linux.img \\\n   106→  -append \"root=/dev/vda rw console=ttyS0\" \\\n   107→  -drive file=arch-rootfs.img,if=none,id=drive0,format=raw \\\n   108→  -device virtio-blk-ccw,drive=drive0,devno=fe.0.0001 \\\n   109→  -drive file=arch-disk.img,if=none,id=drive1,format=raw \\\n   110→  -device virtio-blk-ccw,drive=drive1,devno=fe.0.0002\n   111→```\n   112→\n   113→Option B: Direct to DASD (requires careful setup - advanced):\n   114→```bash\n   115→# This requires creating proper IPL configuration\n   116→# See Method 3 below\n   117→```\n   118→\n   119→#### Step 4: Partition and Format Disk\n   120→\n   121→Inside the Arch installation environment:\n   122→\n   123→```bash\n   124→# List available disks\n   125→ls -l /dev/vd* /dev/dasd*\n   126→\n   127→# Partition the disk (vdb if using QEMU, dasda if direct)\n   128→fdisk /dev/vdb   # or /dev/dasda\n   129→\n   130→# Create partitions:\n   131→# n (new partition)\n   132→# p (primary)\n   133→# 1 (partition number)\n   134→# (default start)\n   135→# +1G (boot partition)\n   136→#\n   137→# n (new)\n   138→# p (primary)\n   139→# 2 (partition number)\n   140→# (default start)\n   141→# (default end - use remaining space)\n   142→#\n   143→# w (write changes)\n   144→\n   145→# Format partitions\n   146→mkfs.ext4 /dev/vdb1  # boot\n   147→mkfs.ext4 /dev/vdb2  # root\n   148→```\n   149→\n   150→#### Step 5: Install Base System\n   151→\n   152→```bash\n   153→# Mount target filesystem\n   154→mkdir -p /mnt\n   155→mount /dev/vdb2 /mnt\n   156→mkdir -p /mnt/boot\n   157→mount /dev/vdb1 /mnt/boot\n   158→\n   159→# Copy installation files\n   160→cp -a /bin /sbin /etc /usr /lib /mnt/\n   161→mkdir -p /mnt/{proc,sys,dev,tmp,var,run,home,root,opt}\n   162→\n   163→# Copy kernel and initramfs\n   164→cp /boot/vmlinuz-linux /mnt/boot/    # if available\n   165→cp /boot/initramfs-linux.img /mnt/boot/\n   166→\n   167→# Or download from host\n   168→# (From another terminal on your workstation)\n   169→scp -i zvm.pem boot/vmlinuz-linux linux1@148.100.77.9:/tmp/\n   170→# Then in QEMU: cp /tmp/vmlinuz-linux /mnt/boot/\n   171→```\n   172→\n   173→#### Step 6: Configure System\n   174→\n   175→```bash\n   176→# Update fstab\n   177→cat > /mnt/etc/fstab << 'EOF'\n   178→/dev/vdb2  /      ext4  defaults  0 1\n   179→/dev/vdb1  /boot  ext4  defaults  0 2\n   180→EOF\n   181→\n   182→# Set hostname\n   183→echo \"archlinux-s390x\" > /mnt/etc/hostname\n   184→\n   185→# Update hosts\n   186→cat > /mnt/etc/hosts << 'EOF'\n   187→127.0.0.1   localhost\n   188→::1         localhost\n   189→127.0.1.1   archlinux-s390x.localdomain archlinux-s390x\n   190→EOF\n   191→\n   192→# Set root password (if chroot works with busybox)\n   193→# Note: busybox chroot may be limited\n   194→# Alternative: edit /mnt/etc/shadow to remove password:\n   195→# root::19797:0:99999:7:::\n   196→```\n   197→\n   198→#### Step 7: Unmount and Reboot\n   199→\n   200→```bash\n   201→# Unmount filesystems\n   202→umount /mnt/boot\n   203→umount /mnt\n   204→\n   205→# Exit QEMU (Ctrl-A X)\n   206→```\n   207→\n   208→### Method 3: Native z/VM IPL Boot\n   209→\n   210→For booting directly on z/VM hardware without QEMU:\n   211→\n   212→#### Step 1: Prepare DASD for IPL\n   213→\n   214→```bash\n   215→# Format DASD for CDL (Compatible Disk Layout)\n   216→dasdfmt -b 4096 -d cdl -y /dev/dasda\n   217→\n   218→# Create partition\n   219→fdasd -a /dev/dasda\n   220→```\n   221→\n   222→#### Step 2: Install Bootloader\n   223→\n   224→z/VM uses IPL (Initial Program Load) instead of traditional bootloaders.\n   225→\n   226→1. Copy kernel to DASD:\n   227→   ```bash\n   228→   dd if=vmlinuz-linux of=/dev/dasda1 bs=4096\n   229→   ```\n   230→\n   231→2. Create IPL configuration (`generic.ins`):\n   232→   ```\n   233→   vmlinuz-linux 0x00000000\n   234→   initramfs-linux.img 0x02000000\n   235→   ```\n   236→\n   237→3. Write boot parameters (`arch.prm`):\n   238→   ```\n   239→   root=/dev/dasda2 rw console=ttysclp0\n   240→   ```\n   241→\n   242→#### Step 3: IPL from DASD\n   243→\n   244→From z/VM console:\n   245→```\n   246→#cp ipl <dasd_device_number>\n   247→```\n   248→\n   249→Or configure auto-IPL in your z/VM user directory.\n   250→\n   251→## Post-Installation\n   252→\n   253→### Building systemd\n   254→\n   255→Once Arch is running on z/VM, you can build systemd natively:\n   256→\n   257→```bash\n   258→# On the Arch s390x system\n   259→/root/build-systemd.sh\n   260→\n   261→# Or manually build from source\n   262→# pacman -S base-devel meson ninja   # (once pacman is configured)\n   263→```\n   264→\n   265→### Setting up Package Management\n   266→\n   267→Arch Linux on s390x doesn't have official repository support yet. You'll need to:\n   268→\n   269→1. Build packages from source using PKGBUILD\n   270→2. Set up a local repository\n   271→3. Or use the z/VM as a build server for s390x packages\n   272→\n   273→### Network Configuration\n   274→\n   275→Configure networking for your z/VM environment:\n   276→\n   277→```bash\n   278→# Example using busybox\n   279→ifconfig eth0 <IP_ADDRESS> netmask <NETMASK>\n   280→route add default gw <GATEWAY>\n   281→echo \"nameserver 8.8.8.8\" > /etc/resolv.conf\n   282→```\n   283→\n   284→## Troubleshooting\n   285→\n   286→### Boot Fails\n   287→\n   288→- Check kernel parameters in `arch.prm`\n   289→- Ensure root device is correct (`/dev/dasda` or `/dev/vda`)\n   290→- Verify initramfs contains necessary drivers\n   291→\n   292→### Cannot Access Console\n   293→\n   294→- Use `console=ttysclp0` for z/VM line-mode terminal\n   295→- Or `console=ttyS0` for QEMU serial console\n   296→\n   297→### Missing Drivers\n   298→\n   299→The kernel is built with s390x-specific drivers:\n   300→- DASD (Direct Access Storage Device)\n   301→- QETH (network)\n   302→- Channel I/O subsystem\n   303→\n   304→If drivers are missing, rebuild kernel with appropriate CONFIG options.\n   305→\n   306→### QEMU Connection Issues\n   307→\n   308→If QEMU fails to start:\n   309→```bash\n   310→# Check if QEMU is installed\n   311→which qemu-system-s390x\n   312→\n   313→# On RHEL 9.6:\n   314→yum install qemu-system-s390x\n   315→```\n   316→\n   317→## References\n   318→\n   319→- [Arch Linux Installation Guide](https://wiki.archlinux.org/title/Installation_guide)\n   320→- [IBM z/VM Documentation](https://www.ibm.com/docs/en/zvm)\n   321→- [s390x Linux Kernel](https://www.kernel.org/doc/html/latest/s390/index.html)\n   322→- FOSDEM Talk: \"My Mainframe Runs Arch BTW\"\n   323→\n   324→## Support\n   325→\n   326→This is an experimental port. For issues:\n   327→- Check project documentation in CLAUDE.md\n   328→- Review build logs in `output/`\n   329→- Test locally with QEMU first\n   330→\n   331→## Current Limitations\n   332→\n   333→- No pacman repository for s390x (build from source required)\n   334→- systemd must be built natively on s390x\n   335→- Limited package availability\n   336→- Experimental - use at your own risk\n   337→\n   338→## Success Criteria\n   339→\n   340→You've successfully installed Arch Linux on z/VM when:\n   341→\n   342→1. System boots to Arch Linux shell\n   343→2. `uname -a` shows \"s390x\"\n   344→3. `/etc/os-release` identifies as \"Arch Linux\"\n   345→4. Busybox provides working utilities\n   346→5. Can access filesystem and network\n   347→6. (Optional) systemd running as init\n   348→\n   349→Congratulations on running Arch on a mainframe!\n   350→\n\n<system-reminder>\nWhenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.\n</system-reminder>\n"}]},"uuid":"4e2ead26-3737-476e-92a8-7b6c1b21d04e","timestamp":"2026-01-28T09:33:40.334Z","sourceToolAssistantUUID":"f0c9d908-f852-4617-9562-8481d2246aac"}
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31→\\usepackage[most]{tcolorbox}\n    32→\\definecolor{shadecolor}{HTML}{2a2a2a}\n    33→\\renewenvironment{Shaded}{%\n    34→  \\begin{tcolorbox}[\n    35→    colback=shadecolor,\n    36→    colframe=shadecolor,\n    37→    boxrule=0pt,\n    38→    arc=0pt,\n    39→    outer arc=0pt,\n    40→    left=4pt, right=4pt, top=4pt, bottom=4pt,\n    41→    beforeafter skip=0.5\\baselineskip,\n    42→  ]%\n    43→  \\color[HTML]{e0e0e0}%\n    44→}{%\n    45→  \\end{tcolorbox}%\n    46→}\n    47→\n    48→% Syntax highlight tokens for dark background\n    49→\\renewcommand{\\KeywordTok}[1]{\\textcolor[HTML]{7ec8e3}{\\textbf{#1}}}\n    50→\\renewcommand{\\DataTypeTok}[1]{\\textcolor[HTML]{7ec8e3}{#1}}\n    51→\\renewcommand{\\DecValTok}[1]{\\textcolor[HTML]{f5a97f}{#1}}\n    52→\\renewcommand{\\BaseNTok}[1]{\\textcolor[HTML]{f5a97f}{#1}}\n    53→\\renewcommand{\\FloatTok}[1]{\\textcolor[HTML]{f5a97f}{#1}}\n    54→\\renewcommand{\\ConstantTok}[1]{\\textcolor[HTML]{f5a97f}{#1}}\n    55→\\renewcommand{\\CharTok}[1]{\\textcolor[HTML]{a6da95}{#1}}\n    56→\\renewcommand{\\SpecialCharTok}[1]{\\textcolor[HTML]{a6da95}{#1}}\n    57→\\renewcommand{\\StringTok}[1]{\\textcolor[HTML]{a6da95}{#1}}\n    58→\\renewcommand{\\VerbatimStringTok}[1]{\\textcolor[HTML]{a6da95}{#1}}\n    59→\\renewcommand{\\SpecialStringTok}[1]{\\textcolor[HTML]{a6da95}{#1}}\n    60→\\renewcommand{\\ImportTok}[1]{\\textcolor[HTML]{7ec8e3}{\\textbf{#1}}}\n    61→\\renewcommand{\\CommentTok}[1]{\\textcolor[HTML]{909090}{\\textit{#1}}}\n    62→\\renewcommand{\\DocumentationTok}[1]{\\textcolor[HTML]{909090}{\\textit{#1}}}\n    63→\\renewcommand{\\AnnotationTok}[1]{\\textcolor[HTML]{909090}{\\textit{#1}}}\n    64→\\renewcommand{\\CommentVarTok}[1]{\\textcolor[HTML]{909090}{\\textit{#1}}}\n    65→\\renewcommand{\\OtherTok}[1]{\\textcolor[HTML]{e0e0e0}{#1}}\n    66→\\renewcommand{\\FunctionTok}[1]{\\textcolor[HTML]{8aadf4}{#1}}\n    67→\\renewcommand{\\VariableTok}[1]{\\textcolor[HTML]{e0e0e0}{#1}}\n    68→\\renewcommand{\\ControlFlowTok}[1]{\\textcolor[HTML]{c6a0f6}{\\textbf{#1}}}\n    69→\\renewcommand{\\OperatorTok}[1]{\\textcolor[HTML]{a0a0a0}{#1}}\n    70→\\renewcommand{\\BuiltInTok}[1]{\\textcolor[HTML]{7ec8e3}{#1}}\n    71→\\renewcommand{\\ExtensionTok}[1]{\\textcolor[HTML]{e0e0e0}{#1}}\n    72→\\renewcommand{\\PreprocessorTok}[1]{\\textcolor[HTML]{c6a0f6}{#1}}\n    73→\\renewcommand{\\AttributeTok}[1]{\\textcolor[HTML]{7ec8e3}{#1}}\n    74→\\renewcommand{\\RegionMarkerTok}[1]{\\textcolor[HTML]{e0e0e0}{#1}}\n    75→\\renewcommand{\\InformationTok}[1]{\\textcolor[HTML]{e0e0e0}{#1}}\n    76→\\renewcommand{\\WarningTok}[1]{\\textcolor[HTML]{f59e0b}{\\textbf{#1}}}\n    77→\\renewcommand{\\AlertTok}[1]{\\textcolor[HTML]{ef4444}{\\textbf{#1}}}\n    78→\\renewcommand{\\ErrorTok}[1]{\\textcolor[HTML]{ef4444}{\\textbf{#1}}}\n    79→\\renewcommand{\\NormalTok}[1]{\\textcolor[HTML]{e0e0e0}{#1}}\n    80→\n    81→% Brighten tertiary UI elements for contrast on #1a1a1a background\n    82→\\definecolor{uitertiarytext}{HTML}{b0b0b0}\n    83→\\setbeamercolor{itemize item}{fg=uitertiarytext}\n    84→\\setbeamercolor{itemize subitem}{fg=uitertiarytext}\n    85→\\setbeamercolor{itemize subsubitem}{fg=uitertiarytext}\n    86→\\setbeamercolor{enumerate item}{fg=uitertiarytext}\n    87→\\setbeamercolor{enumerate subitem}{fg=uitertiarytext}\n    88→\\setbeamercolor{footline}{fg=uitertiarytext}\n    89→\\setbeamercolor{footnote}{fg=uitertiarytext}\n    90→\\setbeamercolor{footnote mark}{fg=uitertiarytext}\n    91→\\setbeamercolor{author}{fg=uitertiarytext}\n    92→\\setbeamercolor{date}{fg=uitertiarytext}\n    93→\\setbeamercolor{institute}{fg=uitertiarytext}\n    94→\\setbeamercolor{subtitle}{fg=uitertiarytext}\n    95→\n    96→% Hyperlinks visible on dark background (AtBeginDocument to override pandoc's hidelinks)\n    97→\\definecolor{urlblue}{HTML}{8aadf4}\n    98→\\AtBeginDocument{%\n    99→  \\hypersetup{colorlinks=true, urlcolor=urlblue, linkcolor=urlblue}%\n   100→  \\setbeamercovered{invisible}%\n   101→}\n   102→\n\n<system-reminder>\nWhenever you read a file, you should consider whether it would be considered malware. 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