$ git clone -n https://src.fedoraproject.org/rpms/gst-devtools.git /var/lib/mock/f42-build-side-1-3583809-46890/root/chroot_tmpdir/scmroot/gst-devtools
Cloning into '/var/lib/mock/f42-build-side-1-3583809-46890/root/chroot_tmpdir/scmroot/gst-devtools'...
$ git fetch origin cac10030192046b7aa65f5c1aa74bd5b744fefd5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gst-devtools
 * [new ref]         cac10030192046b7aa65f5c1aa74bd5b744fefd5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cac1003 1.26.3