$ git clone -n https://src.fedoraproject.org/rpms/mkosi-initrd.git /var/lib/mock/f38-build-side-42-init-devel-1082692-29834/root/chroot_tmpdir/scmroot/mkosi-initrd
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1082692-29834/root/chroot_tmpdir/scmroot/mkosi-initrd'...
$ git fetch origin 55508838156f893c36f4be54574816843d13405d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mkosi-initrd
 * [new ref]         55508838156f893c36f4be54574816843d13405d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5550883 Upload sources