$ git clone -n https://src.fedoraproject.org/rpms/perl-Regexp-Common.git /var/lib/mock/f45-build-26017-614/root/chroot_tmpdir/scmroot/perl-Regexp-Common
Cloning into '/var/lib/mock/f45-build-26017-614/root/chroot_tmpdir/scmroot/perl-Regexp-Common'...
$ git fetch origin 02b70b604c9ec90b21508791e03900bb7605bf10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Regexp-Common
 * [new ref]         02b70b604c9ec90b21508791e03900bb7605bf10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 02b70b6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild