$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Image-GD.git /var/lib/mock/f45-build-26689-618/root/chroot_tmpdir/scmroot/perl-Test-Image-GD
Cloning into '/var/lib/mock/f45-build-26689-618/root/chroot_tmpdir/scmroot/perl-Test-Image-GD'...
$ git fetch origin a6461c9cd0b85249855a21319eab88c63df2e382:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Image-GD
 * [new ref]         a6461c9cd0b85249855a21319eab88c63df2e382 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a6461c9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild