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maziggy
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Nightly backups to a mounted NAS share ran from May and then stopped, failing with [Errno 30] Read-only file system. The reporter checked folder permissions -- correctly: the mount is gid=backup,dir_mode=0775, the service user is in that group, and his own shell writes to the share fine. Errno 30 is EROFS. A permission problem is errno 13. EROFS means the filesystem refused the write, and it refused because we told it to: our systemd unit ships ProtectSystem=strict, which mounts everything read-only inside the service's mount namespace and carves back out only ReadWritePaths=<install> <data> <logs>. A NAS share is not one of those three. Reads are unaffected -- which is why the UI happily listed his existing backups from the share while being unable to write a new one -- and his shell is outside the namespace entirely, so every check he could think to run said the directory was fine. Both installers write the unit file wholesale, so a ReadWritePaths line added by hand disappeared on the next install, taking the backups with it. They now back the old unit up (.bak-<timestamp>) and carry the operator's extra writable paths forward, reporting which ones they kept. The unit template documents the carve-out. The output directory is probed with a real write when it is saved and when the backup card loads, so an unwritable path is caught there rather than at 03:00 for a week. On failure the card names the cause and hands over the fix with the operator's path already in it (systemctl edit bambuddy -> ReadWritePaths=...), and a failed run reports the same diagnosis rather than the raw OSError. EROFS outside systemd, permission-denied, out-of-space, not-a-directory and missing are told apart, in all 11 locales. Docker: a backup path that is not bind-mounted is writable -- the write lands in the container's ephemeral layer and is lost on the next compose up. The probe compares the directory's device against the container root and warns, with the compose snippet that mounts it properly.
41 lines
1.8 KiB
HTML
41 lines
1.8 KiB
HTML
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