$ git clone -n https://src.fedoraproject.org/rpms/dwarves.git /var/lib/mock/f40-build-801349-143761/root/chroot_tmpdir/scmroot/dwarves
Cloning into '/var/lib/mock/f40-build-801349-143761/root/chroot_tmpdir/scmroot/dwarves'...
$ git fetch origin da8000922b0b7afc6980bbdfdb2f7645f8633aea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dwarves
 * [new ref]         da8000922b0b7afc6980bbdfdb2f7645f8633aea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da80009 New release: 1.26