microstack.openstack unable to read files leading to tremedous trouble while using CLI

[Vishwa Mithra Tatta Tatta]

I was trying to add configuration file to my instace using
microstack.openstack server create \
--image ubi \
--flavor m1.small \
--security-group default \
--net-id=test \
--user-data=ud.txt \
r1

The error is that
"Permission denied:unable to read ud.txt"
The file ud.txt is present there, and is in 777 mode too.
This same issue repeats when I try to create a ssh-key with my own public/private key pair.
I believe, microstack is unable to read the files in the same directory for some reason.
I sincerely request you to rectify this.

[Jason C. Nucciarone (nuccitheboss)]

Hello there Vishwa. This issue is mostly caused by the same problem I reported in an earlier bug report: https://bugs.launchpad.net/microstack/+bug/1980993.

The inability to read files from your system is a problem with the confinement of the Microstack snap. The openstack-wrapper part of the snapcraft.yaml file is missing two critical interfaces: `home` and `removable-media`*. This interfaces are necessary for applications that read/write files from folders under the users home directory and removable drives. If you switch the snap to `devmode` confinement (--devmode), you should see no issues with reading files on your system.

I have a commit that fixes the issue, but it still needs to be approved by the MicroStack maintainers. Should hopefully be fixed soon.

*Doc pages for the home and removable-media interfaces:

- home: https://snapcraft.io/docs/home-interface
- removable-media: https://snapcraft.io/docs/removable-media-interface