initrd-parse-etc: override argv[0] to avoid dracut issue

Quoting https://github.com/systemd/systemd/pull/24054#issuecomment-1210501631:
> this would need a patch in dracut, specifically adding the
> systemd-sysroot-fstab-check to the list of installed stuff:
> https://github.com/dracutdevs/dracut/blob/fe8fa2b0cadbb33e27c8dd8b5851548dcd65835c/modules.d/00systemd/module-setup.sh#L47.
>
> I could do this manually in the CI (and I guess I'd have to do it anyway even
> if the patch lands in upstream, since it won't be available in C8S), but it
> should get there first before merging this PR, otherwise it's going to break
> Rawhide.

diff --git a/units/initrd-parse-etc.service.in b/units/initrd-parse-etc.service.in
index 5ac7a24bb01cc7d007360cc1554773bf2a231a07..fe0e860150c2862917b98ecb3872778bc092248f 100644 (file)
--- a/units/initrd-parse-etc.service.in
+++ b/units/initrd-parse-etc.service.in
@@ -21,7 +21,9 @@ OnFailureJobMode=replace-irreversibly
 [Service]
 Type=oneshot
 
-ExecStart={{ROOTLIBEXECDIR}}/systemd-sysroot-fstab-check
+# FIXME: once dracut is patched to install the symlink, change to:
+# ExecStart={{ROOTLIBEXECDIR}}/systemd-sysroot-fstab-check
+ExecStart=@{{SYSTEM_GENERATOR_DIR}}/systemd-fstab-generator systemd-sysroot-fstab-check
 
 # We want to enqueue initrd-cleanup.service/start after we finished the part
 # above. It can't be part of the initial transaction, because non-oneshot units