$ git clone -n https://src.fedoraproject.org/rpms/at-spi2-core.git /var/lib/mock/f42-build-381-66/root/chroot_tmpdir/scmroot/at-spi2-core
Cloning into '/var/lib/mock/f42-build-381-66/root/chroot_tmpdir/scmroot/at-spi2-core'...
$ git fetch origin f48491b7d4d5a8670f58aa1387c542563f70bbf0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/at-spi2-core
 * [new ref]         f48491b7d4d5a8670f58aa1387c542563f70bbf0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f48491b Update to 2.56.3