$ git clone -n https://src.fedoraproject.org/rpms/golang-modernc-ir.git /var/lib/mock/f45-build-12676-443/root/chroot_tmpdir/scmroot/golang-modernc-ir
Cloning into '/var/lib/mock/f45-build-12676-443/root/chroot_tmpdir/scmroot/golang-modernc-ir'...
$ git fetch origin 66acc792936986bd3ea0e4551eed8f430657eb5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-modernc-ir
 * [new ref]         66acc792936986bd3ea0e4551eed8f430657eb5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66acc79 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild