$ git clone -n https://src.fedoraproject.org/rpms/golang-github-chzyer-test.git /var/lib/mock/f45-build-11793-435/root/chroot_tmpdir/scmroot/golang-github-chzyer-test
Cloning into '/var/lib/mock/f45-build-11793-435/root/chroot_tmpdir/scmroot/golang-github-chzyer-test'...
$ git fetch origin 5b54f4a8a239c6f9c88d6595d1ce500f9735d247:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-chzyer-test
 * [new ref]         5b54f4a8a239c6f9c88d6595d1ce500f9735d247 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b54f4a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild