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| author | Danilo M. <danix@danix.xyz> | 2026-09-25 09:25:17 +0200 |
|---|---|---|
| committer | Danilo M. <danix@danix.xyz> | 2026-09-25 09:25:17 +0200 |
| commit | 2fd4fa399e980e3ea351df435d0f0eb2841679d8 (patch) | |
| tree | 4a9e36626d52efd231123a39859216060c072b05 /docs/specs | |
| parent | 5fb8cef38353f27d40b89b62a60b1c48e1a1dd5f (diff) | |
| download | sbo-dockerbuild-2fd4fa399e980e3ea351df435d0f0eb2841679d8.tar.gz sbo-dockerbuild-2fd4fa399e980e3ea351df435d0f0eb2841679d8.zip | |
image-builder: document the XDG_RUNTIME_DIR dockerd trap
A dockerd restarted from a root login shell inherits
XDG_RUNTIME_DIR=/run/user/0. BuildKit's overlay differ creates its temp
dir there, and once elogind removes it at logout every image export
fails with a misleading "ref ... locked" error. This stalled the
-current full image for three nights. The fix on the VM is
`unset XDG_RUNTIME_DIR` in /etc/default/docker, which rc.docker sources.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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