$ git clone -n https://src.fedoraproject.org/rpms/php-pecl-json-post.git /var/lib/mock/f40-build-2244120-53701/root/chroot_tmpdir/scmroot/php-pecl-json-post
Cloning into '/var/lib/mock/f40-build-2244120-53701/root/chroot_tmpdir/scmroot/php-pecl-json-post'...
$ git fetch origin 89deb4695d32ec7e4c48a26a18f7af238f42c9d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-pecl-json-post
 * [new ref]         89deb4695d32ec7e4c48a26a18f7af238f42c9d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89deb46 rebuild for https://fedoraproject.org/wiki/Changes/php83