$ git clone -n https://src.fedoraproject.org/rpms/ruby.git /var/lib/mock/f42-build-3272208-41305/root/chroot_tmpdir/scmroot/ruby
Cloning into '/var/lib/mock/f42-build-3272208-41305/root/chroot_tmpdir/scmroot/ruby'...
$ git fetch origin 7b420c76e8492b9b2c51cc33a976485164b1e23f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ruby
 * [new ref]         7b420c76e8492b9b2c51cc33a976485164b1e23f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b420c7 Upgrade to Ruby 3.4.1.