Deployin CRW in air gapped environment fails on pluginregistry trying to do --in-place sed for meta.yaml files.
It cannot create temporary file, which sed requires for --in-place replacements.

This is the error message:

Checking meta /var/www/html/v3/plugins/che-incubator/cpptools/0.1/meta.yaml
    Updating image registry to image-registry.openshift-image-registry.svc:5000
sed: couldn't open temporary file /var/www/html/v3/plugins/che-incubator/cpptools/0.1/sedtACkaV: Permission denied

Looking at file permissions in /var/www/html/v3/ shows, that group doesn't have write rights, which may be the problem.

Note: The same mechanism works in devfile registry. Inspecting devfile registry image shows, that directories in /var/www/html have drwxrwxr-x rights (pluginregistry has just drwxr-xr-x