$ git clone -n https://src.fedoraproject.org/rpms/perl-YAML-Syck.git /var/lib/mock/f45-build-27590-625/root/chroot_tmpdir/scmroot/perl-YAML-Syck
Cloning into '/var/lib/mock/f45-build-27590-625/root/chroot_tmpdir/scmroot/perl-YAML-Syck'...
$ git fetch origin f6e2f2228a45521808941b3adf20061d099ddc5c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-YAML-Syck
 * [new ref]         f6e2f2228a45521808941b3adf20061d099ddc5c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f6e2f22 Perl 5.44 rebuild