$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-File-ShareDir.git /var/lib/mock/f45-build-26675-618/root/chroot_tmpdir/scmroot/perl-Test-File-ShareDir
Cloning into '/var/lib/mock/f45-build-26675-618/root/chroot_tmpdir/scmroot/perl-Test-File-ShareDir'...
$ git fetch origin 5d30698714eb956c44f81ce46cc437243750af9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-File-ShareDir
 * [new ref]         5d30698714eb956c44f81ce46cc437243750af9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d30698 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild