$ git clone -n https://src.fedoraproject.org/rpms/rubygem-cairo-gobject.git /var/lib/mock/f42-build-865448-173142/root/chroot_tmpdir/scmroot/rubygem-cairo-gobject
Cloning into '/var/lib/mock/f42-build-865448-173142/root/chroot_tmpdir/scmroot/rubygem-cairo-gobject'...
$ git fetch origin d798eec93b2b8bf92669bb2712fb001b2da9c7ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-cairo-gobject
 * [new ref]         d798eec93b2b8bf92669bb2712fb001b2da9c7ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d798eec Rebuild for https://fedoraproject.org/wiki/Changes/Ruby_3.4