$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rmagick.git /var/lib/mock/f40-build-2270549-54829/root/chroot_tmpdir/scmroot/rubygem-rmagick
Cloning into '/var/lib/mock/f40-build-2270549-54829/root/chroot_tmpdir/scmroot/rubygem-rmagick'...
$ git fetch origin eaab5c9dd95ba1e0822309cf25fe199c1f044ed8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rmagick
 * [new ref]         eaab5c9dd95ba1e0822309cf25fe199c1f044ed8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eaab5c9 Rebuild for https://fedoraproject.org/wiki/Changes/Ruby_3.3