$ git clone -n https://src.fedoraproject.org/rpms/rubygem-nokogiri.git /var/lib/mock/f42-build-865197-172845/root/chroot_tmpdir/scmroot/rubygem-nokogiri
Cloning into '/var/lib/mock/f42-build-865197-172845/root/chroot_tmpdir/scmroot/rubygem-nokogiri'...
$ git fetch origin 37ea4b420c0fda264c5497aff61137760ff3b22a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-nokogiri
 * [new ref]         37ea4b420c0fda264c5497aff61137760ff3b22a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37ea4b4 Rebuild for https://fedoraproject.org/wiki/Changes/Ruby_3.4