$ git clone -n https://src.fedoraproject.org/rpms/postgis.git /var/lib/mock/f41-build-812168-147723/root/chroot_tmpdir/scmroot/postgis
Cloning into '/var/lib/mock/f41-build-812168-147723/root/chroot_tmpdir/scmroot/postgis'...
$ git fetch origin 88d18ae68b32568cd8ae95da1a3127ea97208900:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/postgis
 * [new ref]         88d18ae68b32568cd8ae95da1a3127ea97208900 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 88d18ae Rebuild (gdal)