The shared pacman cache was the first writable CacheDir on every arch runner and lab node. Our arch image sets DisableSandbox, so libalpm downloads straight into that directory (util.c _alpm_download_dir_setup only makes a per-process temp dir with the sandbox on), and the XferCommand writes <pkg>.part there with curl -C -o %o; two nodes fetching the same package appended to the same .part file, and the second rename failed or left a corrupt package in the shared cache.
pacman.sh now gives each node its own download directory <shared>/pacman/node-XXXXXX/ (created once with mktemp, reused from pacman.conf on later runs) as the CacheDir between the read-only host layer and <shared>/pacman/, and writes a PostTransaction hook to pacman.d/hooks/infinito-shared-cache.hook that renames every finished package and signature into <shared>/pacman/; .part files stay for the next resume. Both directories sit in one bind mount, so each publish is an atomic rename(2). pacman.sh fails when pacman.conf sets HookDir, since pacman would then skip the hook silently. Requirement 065 and cache.md describe the three layers.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Parallel compose slots, swarm lab clusters and GUI lanes each kept their own pip, npm and pacman downloads, and a failed swarm run left its cluster (about 25 GB of node docker data plus the rescue bundle in the act container) on the root filesystem until someone ran make swarm-down. INFINITO_CACHE_SHARED_HOST_PATH (default <DIR_CACHE>/shared) is now mounted read-write at the same path into every compose slot and every swarm lab node, with PIP_CACHE_DIR and npm_config_cache below it; empty, the renders stay byte-identical to before. On a host whose os-release ID is exactly arch running an arch stack, INFINITO_CACHE_HOST_PACMAN_PATH mounts the host pacman cache read-only and scripts/docker/cache/pacman.sh makes it the first CacheDir with <shared>/pacman/ second, so new downloads land in the shared folder and the host cache stays untouched; on Manjaro and every other host pacman uses the shared folder alone.
make swarm-zombie without keep=true now copies the act job's rescue diagnostics and Playwright artefacts to the host and then releases the lab nodes, the lab network, the NFS export volume and the act outer container, on success and on failure; when the copy fails the nodes still go, the act container stays and the run exits naming make swarm-down. make roundtrip passes keep to every swarm step, make clean-cache removes the shared folder, and the disc-space cleanup skips pacman cache directories it cannot write. apt and dnf keep their per-container caches behind the package-cache proxy, and no docker data root is shared between daemons. Requirement 065.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
kevinveenbirkenbachandClaude Opus 5.5