generator: Fix orphaned /etc/shadow and /etc/gshadow entries before sysusers#2207
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generator: Fix orphaned /etc/shadow and /etc/gshadow entries before sysusers#2207cgwalters wants to merge 1 commit into
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This pull request introduces a new systemd service and internal command to prune orphaned and duplicate entries from /etc/shadow and /etc/gshadow prior to systemd-sysusers execution. The implementation provides utilities for parsing shadow-style files, an RAII guard for file locking, and a systemd generator for conditional activation. Review feedback points out a potential race condition in file metadata retrieval and suggests optimizing string allocations during entry filtering.
…ysusers There's a bit of a trap in the movement from nss-altfiles to systemd-sysusers; if users/groups migrate from the former to the latter, they may leave orphaned entires in the shadow files. systemd-sysusers then tries to create those users/groups at boot it finds them already in the shadow files and fatally errors. Add a generator which enables a unit detects this situation and cleans up the shadow entries. Now in practice: we probably should have made sure that nss-altfiles users don't have shadow entries at all, but that ship has sailed. Fixes: bootc-dev#1179 Assisted-by: OpenCode (Claude Sonnet 4.6) Signed-off-by: Colin Walters <walters@verbum.org>
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There's a bit of a trap in the movement from nss-altfiles to systemd-sysusers; if users/groups migrate from the former to the latter, they may leave orphaned entires in the shadow files.
systemd-sysusers then tries to create those users/groups at boot it finds them already in the shadow files and fatally errors.
Add a generator which enables a unit detects this situation and cleans up the shadow entries.
Now in practice: we probably should have made sure that nss-altfiles users don't have shadow entries at all, but that ship has sailed.
Fixes: #1179
Assisted-by: OpenCode (Claude Sonnet 4.6)