$ git clone -n https://src.fedoraproject.org/rpms/golang-modernc-opt.git /var/lib/mock/f40-build-2700964-70335/root/chroot_tmpdir/scmroot/golang-modernc-opt
Cloning into '/var/lib/mock/f40-build-2700964-70335/root/chroot_tmpdir/scmroot/golang-modernc-opt'...
$ git fetch origin 52e771b841169f7605c4050efc7cb6bb211fe911:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-modernc-opt
 * [new ref]         52e771b841169f7605c4050efc7cb6bb211fe911 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52e771b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild