[pull] main from bootc-dev:main#167
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…eged processes The overlayfs merged view inherits its root permissions from the upperdir. When upper/ was created with 0700 (the same mode passed for work/), the merged / appeared as drwx------ to all non-root processes, causing dbus, systemd units that drop privileges, and anything using DAC to fail with EACCES immediately after switch-root. Fix: create upper/ with 0755 so the merged root is world-traversable. work/ remains 0700 — it is kernel-internal and never exposed in the merged view, so tighter permissions there are harmless. This mirrors what systemd does in volatile-root.c and nspawn-mount.c, and fixes the issue reported in composefs-rs#287. Assisted-by: OpenCode (claude-sonnet-4-6@default) Signed-off-by: Colin Walters <walters@verbum.org>
Image authors who ship /usr/lib/composefs/setup-root-conf.toml to configure composefs mount behaviour (e.g. transient /etc) previously had to add explicit --include flags to every dracut invocation in their Containerfile. Teach module-setup.sh to install the file automatically when present, mirroring what the composefs-rs dracut modules do. Use '[[ -e ]] && inst_simple' rather than inst_if_exists: the latter is not always available when dracut is invoked explicitly with --force in a Containerfile RUN layer (outside of kernel-install's dracut wrapper). Assisted-by: OpenCode (claude-sonnet-4-6@default) Signed-off-by: Colin Walters <walters@verbum.org>
overlay_transient() now returns a detached fsmount fd rather than immediately attaching it, letting the caller decide where to place the overlay. This is a correctness fix: on pre-6.15 kernels, the old code mounted the overlay then continued using the original composefs dirfd for subsequent submounts, which meant /etc and /var landed in the hidden lower layer rather than the visible merged view. The overlay source name now embeds the composefs digest as "transient:composefs=<hash>" so that composefs_booted() can extract the digest from the mount source after switch-root, the same way it does for the normal "composefs:<hash>" source. overlay_state() also loses its unused _mode parameter. Assisted-by: OpenCode (claude-sonnet-4-6@default) Signed-off-by: Colin Walters <walters@verbum.org>
When root.transient = true, bootc-root-setup wraps the composefs lower in an overlayfs whose source is "transient:composefs=<hash>" rather than "composefs:<hash>". Handle both prefixes uniformly so that composefs_booted() works correctly on transient root boots and soft-reboots are detected the same way in both cases. Assisted-by: OpenCode (Claude Sonnet 4.6) Signed-off-by: Colin Walters <walters@verbum.org>
…nux fix Transient overlays (/) inherit tmpfs_t from the upper dir's tmpfs via fs_use_trans at SELinux policy-load time. Add a generator-emitted oneshot unit, bootc-early-overlay-relabel.service, that runs 'bootc internals relabel-overlay-mountpoints' before sysinit.target to restore the correct label on each writable overlayfs mount point. Two detection paths, both needed because the generator runs before local-fs.target: - Root writability: inspect the mount source for the "transient:composefs=" prefix to detect a transient root overlay. - Subdir mounts (/etc): bootc-root-setup.service mounts these after the generator, so we read setup-root-conf.toml directly from the booted image to know whether /etc will be a transient overlay. The detection block runs before the OSTREE_BOOTED guard: native composefs boots do not write /run/ostree-booted, but still need the relabel unit. relabel_overlay_mountpoints() checks both OVERLAYFS_SUPER_MAGIC and !RDONLY to distinguish writable transient overlays from the read-only composefs root (both are overlayfs, only the former needs relabelling). Assisted-by: OpenCode (claude-sonnet-4-6@default) Signed-off-by: Colin Walters <walters@verbum.org>
Add TOML configuration (setup-root-conf.toml) for composefs mount behaviour: - [root] transient = true: wrap the composefs in a tmpfs overlay; all writes are discarded on reboot. - [etc] mount = transient|overlay|bind|none: control how /etc is mounted from the deployment state directory. - [var] mount = none|bind: control whether /var is bind-mounted from state. When mount = none, /var is left as an empty composefs directory. bootc-root-setup also detects the systemd.volatile=state kernel argument at boot time and automatically skips the /var state bind-mount when it is set, leaving /var empty for systemd-fstab-generator to mount a fresh tmpfs there at local-fs.target. This is the recommended way to get an ephemeral /var: it uses a plain tmpfs rather than overlayfs, which is compatible with tools like podman that use overlayfs under /var/lib/containers. Add inject-baseconfig CI helper, a test-baseconfigs CI job, and a 040-test-baseconfigs.nu integration test that boots each configuration in a VM and validates filesystem types, writability, SELinux labels, and podman graph driver compatibility. Assisted-by: OpenCode (claude-sonnet-4-6@default) Signed-off-by: Colin Walters <walters@verbum.org>
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