$ git clone -n https://src.fedoraproject.org/rpms/golang-github-google-subcommands.git /var/lib/mock/f45-build-12016-437/root/chroot_tmpdir/scmroot/golang-github-google-subcommands
Cloning into '/var/lib/mock/f45-build-12016-437/root/chroot_tmpdir/scmroot/golang-github-google-subcommands'...
$ git fetch origin 9ef149142a12e1a7368eaa2b838907f101273e14:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-google-subcommands
 * [new ref]         9ef149142a12e1a7368eaa2b838907f101273e14 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ef1491 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild