$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Script.git /var/lib/mock/f39-build-1435163-31974/root/chroot_tmpdir/scmroot/perl-Test-Script
Cloning into '/var/lib/mock/f39-build-1435163-31974/root/chroot_tmpdir/scmroot/perl-Test-Script'...
$ git fetch origin bf318eb60f2f2ebd64b60bf8c9b10d42b6dfa0ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Script
 * [new ref]         bf318eb60f2f2ebd64b60bf8c9b10d42b6dfa0ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf318eb Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild