$ git clone -n https://src.fedoraproject.org/rpms/libabigail.git /var/lib/mock/f42-build-side-1-3584142-46891/root/chroot_tmpdir/scmroot/libabigail
Cloning into '/var/lib/mock/f42-build-side-1-3584142-46891/root/chroot_tmpdir/scmroot/libabigail'...
$ git fetch origin 86d8734964cd696ec7825d4c7a227774854e1fb9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libabigail
 * [new ref]         86d8734964cd696ec7825d4c7a227774854e1fb9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86d8734 Update to usptream 2.8 tarball