$ git clone -n https://src.fedoraproject.org/rpms/GMT.git /var/lib/mock/f40-build-797472-141353/root/chroot_tmpdir/scmroot/GMT
Cloning into '/var/lib/mock/f40-build-797472-141353/root/chroot_tmpdir/scmroot/GMT'...
$ git fetch origin d78f3ed9b2256ad12e83fd6e539dcf51febc8dec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/GMT
 * [new ref]         d78f3ed9b2256ad12e83fd6e539dcf51febc8dec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d78f3ed Update to 6.5.0