$ git clone -n https://src.fedoraproject.org/rpms/python-pebble.git /var/lib/mock/f40-build-1966359-25208/root/chroot_tmpdir/scmroot/python-pebble
Cloning into '/var/lib/mock/f40-build-1966359-25208/root/chroot_tmpdir/scmroot/python-pebble'...
$ git fetch origin 062a24698f9b0d814e59fd276611ccd9ce3e1096:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pebble
 * [new ref]         062a24698f9b0d814e59fd276611ccd9ce3e1096 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 062a246 Update to 5.0.7 (RHBZ#2270887)