No description
Mathieu Benoit
2a1997e06d
pacman's resolver named 70 unresolved dependencies. Excluding python-brotli alone took that to 47 and removed `python` outright, with libffi, mpdecimal and gdbm behind it. python-libseccomp would have re-admitted the same tree, and nothing across 135 packages depends on either. Both wheels are unusable on the target anyway: built by the host's python 3.13, ABI-tagged cpython-313, while Arch ships 3.14. Stage 2 produces real ones. systemd-ukify is different -- it is architectural. ukify assembles a PE binary and its EFI_ARCH_MAP has no s390x entry, so guess_efi_arch() raises ValueError on this machine. Shipping it would put a program in the repository that cannot start. systemd-tests followed it out: a test suite behind --nocheck, and the only reason five more python packages were wanted. The dropped artefacts were still indexed in core.db afterwards. repo-add only adds, so a sub-package removed from pkgname leaves its last build installable forever. Removed by hand; TODO.md records the gap. --- FR --- Le résolveur de pacman nommait 70 dépendances non résolues. Écarter le seul python-brotli a ramené le compte à 47 et retiré `python` d'un coup, avec libffi, mpdecimal et gdbm derrière. python-libseccomp aurait réadmis le même arbre, et rien parmi 135 paquets ne dépend de l'un ou de l'autre. Les deux roues sont de toute façon inutilisables sur la cible : bâties par le python 3.13 de l'hôte, marquées cpython-313, quand Arch livre la 3.14. L'étage 2 en produira de vraies. systemd-ukify est d'une autre nature — architectural. ukify assemble un binaire PE et son EFI_ARCH_MAP n'a pas d'entrée s390x : guess_efi_arch() lève donc ValueError sur cette machine. Le livrer mettrait au dépôt un programme incapable de démarrer. systemd-tests l'a suivi : une suite de tests derrière --nocheck, et la seule raison de réclamer cinq paquets python de plus. Les artefacts écartés restaient indexés dans core.db. repo-add n'ajoute que : un sous-paquet retiré de pkgname laisse sa dernière compilation installable à jamais. Retirés à la main ; TODO.md consigne le manque. Assisted-by: Claude Opus 5 |
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Arch Linux s390x
A port of Arch Linux to IBM s390x mainframe architecture with systemd support.
Boots a full Arch Linux system on IBM mainframes (or QEMU s390x emulation) using a hybrid build: cross-compilation for the kernel, native s390x compilation on z/VM for userspace.
Quick Start
make container # build dev container (first time)
cp .env.example .env # configure z/VM access
make all # build kernel + initramfs + systemd
make test-systemd # boot it
What Works
- Arch Linux kernel 6.18.6-arch1 with Arch patches, cross-compiled
- Initramfs via modified mkinitcpio
- Static busybox built natively on z/VM, 2.3MB
- Root filesystem with ext4, switch_root to real rootfs
- Systemd as PID 1
Pacman, bash, and GNU coreutils are not yet ported.
Build System
The build uses two tiers:
Cross-compilation (x86_64 host): Kernel is built in a Fedora 43 container with s390x-linux-gnu-gcc. Initramfs is generated with a patched mkinitcpio that handles cross-architecture binary injection.
Native compilation (s390x z/VM): Busybox and systemd must be built on real s390x hardware. The z/VM system runs RHEL 9.6 with GCC 11.5.0. Scripts handle SSH deployment and retrieval automatically via .env configuration.