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This pull request introduces logic to detect if the system is running on ostree and updates the crypttab generation to include the 'x-initrd.attach' option when necessary. I have identified an issue where the ostree marker file is incorrectly being checked within the target sysroot instead of the host's runtime directory. Additionally, I have suggested updating the detection logic to support an environment variable override for better testability and recommended updating the test case to verify the full crypttab output.
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Add tests verifying x-initrd.attach option is added to crypttab entries on ostree systems. This prevents systemd-cryptsetup-generator from tearing down LUKS devices during soft-reboot. Related: coreos#2216
On ostree systems, soft-reboot fails with LUKS because systemd tears down the crypto device during shutdown. Unlike traditional systems where the kernel root mount prevents this, ostree's /sysroot is a regular mount. Add x-initrd.attach to crypttab entries on ostree systems (detected via /run/ostree-booted or OSTREE_BOOTED=1 env var). This tells systemd- cryptsetup-generator to skip adding Conflicts=umount.target, preventing device teardown. Non-ostree systems are unchanged. Fixes: coreos#2216
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