$ git clone -n https://src.fedoraproject.org/rpms/rubygem-concurrent-ruby.git /var/lib/mock/f40-build-732432-13186/root/chroot_tmpdir/scmroot/rubygem-concurrent-ruby
Cloning into '/var/lib/mock/f40-build-732432-13186/root/chroot_tmpdir/scmroot/rubygem-concurrent-ruby'...
$ git fetch origin 540d8d463c471cec441b777e0e270f400465a56e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-concurrent-ruby
 * [new ref]         540d8d463c471cec441b777e0e270f400465a56e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 540d8d4 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild