$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Dir.git /var/lib/mock/f45-build-26626-618/root/chroot_tmpdir/scmroot/perl-Test-Dir
Cloning into '/var/lib/mock/f45-build-26626-618/root/chroot_tmpdir/scmroot/perl-Test-Dir'...
$ git fetch origin d9ea3cb236d5cc69bbef1d807f668315ea4b0782:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Dir
 * [new ref]         d9ea3cb236d5cc69bbef1d807f668315ea4b0782 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d9ea3cb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild