$ git clone -n https://src.fedoraproject.org/rpms/mkosi14.git /var/lib/mock/f41-build-731973-13178/root/chroot_tmpdir/scmroot/mkosi14
Cloning into '/var/lib/mock/f41-build-731973-13178/root/chroot_tmpdir/scmroot/mkosi14'...
$ git fetch origin c4e1dce6732d33968482ee4d4a581fa259356279:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mkosi14
 * [new ref]         c4e1dce6732d33968482ee4d4a581fa259356279 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c4e1dce This compat package is not provided for F41+