$ git clone -n https://src.fedoraproject.org/rpms/rubygem-gtksourceview2.git /var/lib/mock/f42-build-865340-173025/root/chroot_tmpdir/scmroot/rubygem-gtksourceview2
Cloning into '/var/lib/mock/f42-build-865340-173025/root/chroot_tmpdir/scmroot/rubygem-gtksourceview2'...
$ git fetch origin 8d4344b05fd10bfc3c8399c56bea8f87f60752bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-gtksourceview2
 * [new ref]         8d4344b05fd10bfc3c8399c56bea8f87f60752bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d4344b Rebuild for https://fedoraproject.org/wiki/Changes/Ruby_3.4