$ git clone -n https://src.fedoraproject.org/rpms/squashfs-tools-ng.git /var/lib/mock/f40-build-2645639-66576/root/chroot_tmpdir/scmroot/squashfs-tools-ng
Cloning into '/var/lib/mock/f40-build-2645639-66576/root/chroot_tmpdir/scmroot/squashfs-tools-ng'...
$ git fetch origin ac6eee8f51ce4c27d3957c255f051f558d8b01f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/squashfs-tools-ng
 * [new ref]         ac6eee8f51ce4c27d3957c255f051f558d8b01f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac6eee8 fix sqfstar test checksums for zlib-ng