$ git clone -n https://src.fedoraproject.org/rpms/rubygem-mustermann.git /var/lib/mock/f39-build-1499371-34744/root/chroot_tmpdir/scmroot/rubygem-mustermann
Cloning into '/var/lib/mock/f39-build-1499371-34744/root/chroot_tmpdir/scmroot/rubygem-mustermann'...
$ git fetch origin dc100e5a968a4214b8298cfc2ebaa87d1b19f5b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-mustermann
 * [new ref]         dc100e5a968a4214b8298cfc2ebaa87d1b19f5b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc100e5 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild