$ git clone -n https://src.fedoraproject.org/rpms/caja-extensions.git /var/lib/mock/f40-build-2208877-52147/root/chroot_tmpdir/scmroot/caja-extensions
Cloning into '/var/lib/mock/f40-build-2208877-52147/root/chroot_tmpdir/scmroot/caja-extensions'...
$ git fetch origin a4c332d69ee5543dcf2c36e85ce4c42184695f0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/caja-extensions
 * [new ref]         a4c332d69ee5543dcf2c36e85ce4c42184695f0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4c332d add upstream commits