$ git clone -n https://src.fedoraproject.org/rpms/perl-Validation-Class.git /var/lib/mock/f45-build-27361-622/root/chroot_tmpdir/scmroot/perl-Validation-Class
Cloning into '/var/lib/mock/f45-build-27361-622/root/chroot_tmpdir/scmroot/perl-Validation-Class'...
$ git fetch origin 6bf364bf458090faf4acbd2f2f3472c37c415da7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Validation-Class
 * [new ref]         6bf364bf458090faf4acbd2f2f3472c37c415da7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6bf364b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild