$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-format.git /var/lib/mock/f40-build-2590689-62633/root/chroot_tmpdir/scmroot/gap-pkg-format
Cloning into '/var/lib/mock/f40-build-2590689-62633/root/chroot_tmpdir/scmroot/gap-pkg-format'...
$ git fetch origin 3f1ac61ccb391b3472afb349864b49ebbae2043d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-format
 * [new ref]         3f1ac61ccb391b3472afb349864b49ebbae2043d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f1ac61 Rebuild for gap 4.13.0