$ git clone -n https://src.fedoraproject.org/rpms/gprbuild.git /var/lib/mock/f41-build-1476464-23792/root/chroot_tmpdir/scmroot/gprbuild
Cloning into '/var/lib/mock/f41-build-1476464-23792/root/chroot_tmpdir/scmroot/gprbuild'...
$ git fetch origin ffdd21ff899690516431c08ec392ffa2b1f76dec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gprbuild
 * [new ref]         ffdd21ff899690516431c08ec392ffa2b1f76dec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffdd21f Added missing build dependencies on findutils and tar.