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sysext: Configure overlayfs mount options via envvar

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Implements #39314
This commit is contained in:
Nick Labich
2025-10-16 22:42:58 -04:00
committed by Lennart Poettering
parent 5b09b43106
commit 942ad8503a
3 changed files with 127 additions and 26 deletions
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8
docs/ENVIRONMENT.md
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@@ -413,6 +413,14 @@ All tools:
variable. Similarly, `$SYSTEMD_CONFEXT_MUTABLE_MODE` works for confext images
and supports the systemd-confext multi-call functionality of sysext.
* `$SYSTEMD_SYSEXT_OVERLAYFS_MOUNT_OPTIONS` — this variable may be used to
override the overlayfs mount options applied for hierarchies managed by
`systemd-sysext`. Similarly, `$SYSTEMD_CONFEXT_OVERLAYFS_MOUNT_OPTIONS` works
for confext images and supports the systemd-confext multi-call functionality
of sysext. Read-only hierarchies have no mount options added by
default. Mutable hierarchies have the following mount options added by
default: `redirect_dir=on,noatime,metacopy=off,index=off`.
`systemd-tmpfiles`:
* `$SYSTEMD_TMPFILES_FORCE_SUBVOL` — if unset, `v`/`q`/`Q` lines will create