$ git clone -n https://src.fedoraproject.org/rpms/jsonrpc-glib.git /var/lib/mock/f45-build-14480-461/root/chroot_tmpdir/scmroot/jsonrpc-glib
Cloning into '/var/lib/mock/f45-build-14480-461/root/chroot_tmpdir/scmroot/jsonrpc-glib'...
$ git fetch origin d54362accd47a01a84122f67a5c2e803646e59e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jsonrpc-glib
 * [new ref]         d54362accd47a01a84122f67a5c2e803646e59e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d54362a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild