$ git clone -n https://src.fedoraproject.org/rpms/rubygem-gobject-introspection.git /var/lib/mock/f42-build-865336-173025/root/chroot_tmpdir/scmroot/rubygem-gobject-introspection
Cloning into '/var/lib/mock/f42-build-865336-173025/root/chroot_tmpdir/scmroot/rubygem-gobject-introspection'...
$ git fetch origin f5355e0045a9400c68e6696f2df3e62bcc7d2eee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-gobject-introspection
 * [new ref]         f5355e0045a9400c68e6696f2df3e62bcc7d2eee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5355e0 Rebuild for https://fedoraproject.org/wiki/Changes/Ruby_3.4