$ git clone -n https://src.fedoraproject.org/rpms/golang-github-pkg-browser.git /var/lib/mock/f45-build-12357-441/root/chroot_tmpdir/scmroot/golang-github-pkg-browser
Cloning into '/var/lib/mock/f45-build-12357-441/root/chroot_tmpdir/scmroot/golang-github-pkg-browser'...
$ git fetch origin e8f6f40100162bba1447b926ecff20936b0bf52d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-pkg-browser
 * [new ref]         e8f6f40100162bba1447b926ecff20936b0bf52d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e8f6f40 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild