$ git clone -n https://src.fedoraproject.org/rpms/at-spi2-core.git /var/lib/mock/f42-build-side-1-3502011-45976/root/chroot_tmpdir/scmroot/at-spi2-core
Cloning into '/var/lib/mock/f42-build-side-1-3502011-45976/root/chroot_tmpdir/scmroot/at-spi2-core'...
$ git fetch origin 1a6def0008a22d71e56238bd2d1330c95d3dc37e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/at-spi2-core
 * [new ref]         1a6def0008a22d71e56238bd2d1330c95d3dc37e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a6def0 Update to 2.56.1