$ git clone -n https://src.fedoraproject.org/rpms/perl-YAML-LibYAML.git /var/lib/mock/f45-build-27610-625/root/chroot_tmpdir/scmroot/perl-YAML-LibYAML
Cloning into '/var/lib/mock/f45-build-27610-625/root/chroot_tmpdir/scmroot/perl-YAML-LibYAML'...
$ git fetch origin 4e40b9a6c2ed0739232fbaa63ae05ad38f09be06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-YAML-LibYAML
 * [new ref]         4e40b9a6c2ed0739232fbaa63ae05ad38f09be06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e40b9a Perl 5.44 re-rebuild of bootstrapped packages