$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-LibGumbo.git /var/lib/mock/f45-build-21607-587/root/chroot_tmpdir/scmroot/perl-Alien-LibGumbo
Cloning into '/var/lib/mock/f45-build-21607-587/root/chroot_tmpdir/scmroot/perl-Alien-LibGumbo'...
$ git fetch origin 98e5db18bf00274c9aa68d5b521394cbf0f94a25:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-LibGumbo
 * [new ref]         98e5db18bf00274c9aa68d5b521394cbf0f94a25 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98e5db1 0.06