$ git clone -n https://src.fedoraproject.org/rpms/libabigail.git /var/lib/mock/f39-build-1591741-38297/root/chroot_tmpdir/scmroot/libabigail
Cloning into '/var/lib/mock/f39-build-1591741-38297/root/chroot_tmpdir/scmroot/libabigail'...
$ git fetch origin 9fb63acdcbac741aa013a683833a6527f139dbe6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libabigail
 * [new ref]         9fb63acdcbac741aa013a683833a6527f139dbe6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9fb63ac Update to 2.4 tarball