$ git clone -n https://src.fedoraproject.org/rpms/g2clib.git /var/lib/mock/f41-build-1208222-22498/root/chroot_tmpdir/scmroot/g2clib
Cloning into '/var/lib/mock/f41-build-1208222-22498/root/chroot_tmpdir/scmroot/g2clib'...
$ git fetch origin 98e59f85b5345f52ddb64b4a6e5023068eb24794:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/g2clib
 * [new ref]         98e59f85b5345f52ddb64b4a6e5023068eb24794 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98e59f8 Eliminate use of obsolete %patchN syntax (#2283636)