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fstab-generator: if usr= is specified, mount it to /sysusr/usr/ first

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This changes the fstab-generator to handle mounting of /usr/ a bit
differently than before. Instead of immediately mounting the fs to
/sysroot/usr/ we'll first mount it to /sysusr/usr/ and then add a
separate bind mount that mounts it from /sysusr/usr/ to /sysroot/usr/.

This way we can access /usr independently of the root fs, without for
waiting to be mounted via the /sysusr/ hierarchy. This is useful for
invoking systemd-repart while a root fs doesn't exist yet and for
creating it, with partition data read from the /usr/ hierarchy.

This introduces a new generic target initrd-usr-fs.target that may be
used to generically order services against /sysusr/ to become available.
This commit is contained in:
Lennart Poettering
2021-03-26 22:40:40 +01:00
parent ee7561d014
commit 29a24ab28e
7 changed files with 100 additions and 17 deletions
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4
units/initrd.target
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@@ -14,6 +14,6 @@ OnFailure=emergency.target
OnFailureJobMode=replace-irreversibly
AssertPathExists=/etc/initrd-release
Requires=basic.target
Wants=initrd-root-fs.target initrd-root-device.target initrd-fs.target initrd-parse-etc.service
After=initrd-root-fs.target initrd-root-device.target initrd-fs.target basic.target rescue.service rescue.target
Wants=initrd-root-fs.target initrd-root-device.target initrd-fs.target initrd-usr-fs.target initrd-parse-etc.service
After=initrd-root-fs.target initrd-root-device.target initrd-fs.target initrd-usr-fs.target basic.target rescue.service rescue.target
AllowIsolate=yes