$ git clone -n https://src.fedoraproject.org/rpms/json-parser.git /var/lib/mock/f41-build-786006-13590/root/chroot_tmpdir/scmroot/json-parser
Cloning into '/var/lib/mock/f41-build-786006-13590/root/chroot_tmpdir/scmroot/json-parser'...
$ git fetch origin 290c867f9bf17d87ad83fa7366663ce9101ed5b0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/json-parser
 * [new ref]         290c867f9bf17d87ad83fa7366663ce9101ed5b0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 290c867 Eliminate use of obsolete %patchN syntax (#2283636)