$ git clone -n https://src.fedoraproject.org/rpms/sage.git /var/lib/mock/f41-build-1190150-22180/root/chroot_tmpdir/scmroot/sage
Cloning into '/var/lib/mock/f41-build-1190150-22180/root/chroot_tmpdir/scmroot/sage'...
$ git fetch origin e32c5bb513eea947d79dfcac0e61e1c6a7e6b983:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sage
 * [new ref]         e32c5bb513eea947d79dfcac0e61e1c6a7e6b983 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e32c5bb Eliminate use of obsolete %patchN syntax (#2283636)