$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-MockModule.git /var/lib/mock/f39-build-1439607-32270/root/chroot_tmpdir/scmroot/perl-Test-MockModule
Cloning into '/var/lib/mock/f39-build-1439607-32270/root/chroot_tmpdir/scmroot/perl-Test-MockModule'...
$ git fetch origin b9f5bcb1c11a0ca62a36705cff3fd6875a4356a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-MockModule
 * [new ref]         b9f5bcb1c11a0ca62a36705cff3fd6875a4356a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9f5bcb Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild