$ git clone -n https://src.fedoraproject.org/rpms/golang-github-insomniacslk-xjson.git /var/lib/mock/f45-build-12074-437/root/chroot_tmpdir/scmroot/golang-github-insomniacslk-xjson
Cloning into '/var/lib/mock/f45-build-12074-437/root/chroot_tmpdir/scmroot/golang-github-insomniacslk-xjson'...
$ git fetch origin 8ed3fddb844ffae62febe7572cfcf31118b8d137:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-insomniacslk-xjson
 * [new ref]         8ed3fddb844ffae62febe7572cfcf31118b8d137 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ed3fdd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild