$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Regexp.git /var/lib/mock/f45-build-26760-619/root/chroot_tmpdir/scmroot/perl-Test-Regexp
Cloning into '/var/lib/mock/f45-build-26760-619/root/chroot_tmpdir/scmroot/perl-Test-Regexp'...
$ git fetch origin 7d77ffd93cdcafe60a0edea3121b99b28bf62dba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Regexp
 * [new ref]         7d77ffd93cdcafe60a0edea3121b99b28bf62dba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d77ffd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild