$ git clone -n https://src.fedoraproject.org/rpms/mkosi.git /var/lib/mock/f40-build-2613341-64062/root/chroot_tmpdir/scmroot/mkosi
Cloning into '/var/lib/mock/f40-build-2613341-64062/root/chroot_tmpdir/scmroot/mkosi'...
$ git fetch origin db1775cbc387eaa18016d62e41bee79ba3f83175:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mkosi
 * [new ref]         db1775cbc387eaa18016d62e41bee79ba3f83175 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db1775c Version 22