$ git clone -n https://src.fedoraproject.org/rpms/perl-Syntax-Keyword-Gather.git /var/lib/mock/f45-build-26381-617/root/chroot_tmpdir/scmroot/perl-Syntax-Keyword-Gather
Cloning into '/var/lib/mock/f45-build-26381-617/root/chroot_tmpdir/scmroot/perl-Syntax-Keyword-Gather'...
$ git fetch origin d121e5a837c966b29ee616091c1f9c3db4dda497:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Syntax-Keyword-Gather
 * [new ref]         d121e5a837c966b29ee616091c1f9c3db4dda497 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d121e5a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild