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[UPD] note why /dev/shm must exist before python is built

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Mathieu Benoit 2026-08-24 00:35:07 -04:00
parent fe9c58c1a3
commit f875649c96
1 changed files with 17 additions and 0 deletions
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17
scripts/build-stage2.sh
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@ -540,6 +540,23 @@ mount_chroot() {
# A tmpfs of its own rather than a bind: nothing here shares semaphores with # A tmpfs of its own rather than a bind: nothing here shares semaphores with
# anything outside the chroot. Mode 1777 because unprivileged builds write # anything outside the chroot. Mode 1777 because unprivileged builds write
# into it. # into it.
#
# AND IT MUST BE HERE BEFORE PYTHON IS BUILT. Mounting it later does not
# help: CPython's configure runs sem_open at BUILD time, and with no /dev/shm
# it concluded the platform has no working semaphores --
#
# POSIX_SEMAPHORES_NOT_ENABLED: 1 (in _sysconfigdata__*.py)
# HAVE_SEM_OPEN: 1 (the function exists)
#
# -- and compiled _multiprocessing without SemLock. Any package that imports
# multiprocessing then fails permanently, with a message blaming the
# platform:
#
# ImportError: This platform lacks a functioning sem_open implementation.
#
# nss is the one that found it. A python built in a chroot without this mount
# stays broken however many times the consumer is retried; the fix is to
# rebuild python, which is why this comment says so.
mountpoint -q "$ROOT/dev/shm" || mountpoint -q "$ROOT/dev/shm" ||
sudo mount -t tmpfs -o mode=1777,nosuid,nodev tmpfs "$ROOT/dev/shm" sudo mount -t tmpfs -o mode=1777,nosuid,nodev tmpfs "$ROOT/dev/shm"
# Sources and PKGBUILDs, already fetched by stage 1. Bind-mounting them # Sources and PKGBUILDs, already fetched by stage 1. Bind-mounting them