$ git clone -n https://src.fedoraproject.org/rpms/perl-Regexp-Pattern.git /var/lib/mock/f45-build-26009-614/root/chroot_tmpdir/scmroot/perl-Regexp-Pattern
Cloning into '/var/lib/mock/f45-build-26009-614/root/chroot_tmpdir/scmroot/perl-Regexp-Pattern'...
$ git fetch origin a08019465f19eab68730271a56b3bfe656f10208:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Regexp-Pattern
 * [new ref]         a08019465f19eab68730271a56b3bfe656f10208 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a080194 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild