$ git clone -n https://src.fedoraproject.org/rpms/golang-github-mattn-runewidth.git /var/lib/mock/f45-build-12242-440/root/chroot_tmpdir/scmroot/golang-github-mattn-runewidth
Cloning into '/var/lib/mock/f45-build-12242-440/root/chroot_tmpdir/scmroot/golang-github-mattn-runewidth'...
$ git fetch origin a4e36505ecf6d52ba850b5fde8b2ce3dba5f0400:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-mattn-runewidth
 * [new ref]         a4e36505ecf6d52ba850b5fde8b2ce3dba5f0400 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4e3650 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild