$ git clone -n https://src.fedoraproject.org/rpms/cryfs.git /var/lib/mock/f38-build-710121-93251/root/chroot_tmpdir/scmroot/cryfs
Cloning into '/var/lib/mock/f38-build-710121-93251/root/chroot_tmpdir/scmroot/cryfs'...
$ git fetch origin 6b6b5fc0d75a0ca970f2f659e0e779a73b74438d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cryfs
 * [new ref]         6b6b5fc0d75a0ca970f2f659e0e779a73b74438d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b6b5fc Add missing patch file