$ git clone -n https://src.fedoraproject.org/rpms/golang-modernc-irgo.git /var/lib/mock/f45-build-12721-443/root/chroot_tmpdir/scmroot/golang-modernc-irgo
Cloning into '/var/lib/mock/f45-build-12721-443/root/chroot_tmpdir/scmroot/golang-modernc-irgo'...
$ git fetch origin bec5de70ffb6b6b665a9140d9eef8e442b1a349c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-modernc-irgo
 * [new ref]         bec5de70ffb6b6b665a9140d9eef8e442b1a349c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bec5de7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild