hab pkg export .. masks insufficient write permission on the filesystem error

[jeremymv2]

With hab version 0.85.0 and perhaps earlier versions, the hab pkg export <..> commands fail as expected when the user running the command does not have write permissions on the /hab filesystem.

However, the stated reason is a generic "not found" error message as opposed to the real insufficient permissions on the filesystem error.

[vagrant@chef-rpminstall ~]$ hab pkg export tar core/nginx
∵ Missing package for core/hab-pkg-export-tar/0.85.0
» Installing core/hab-pkg-export-tar/0.85.0
☁ Determining latest version of core/hab-pkg-export-tar/0.85.0 in the 'stable' channel
☛ Verifying core/hab-pkg-export-tar/0.85.0/20190916223634
» Installing core/hab-pkg-export-tar/0.85.0
☁ Determining latest version of core/hab-pkg-export-tar/0.85.0 in the 'stable' channel
☛ Verifying core/hab-pkg-export-tar/0.85.0/20190916223634
» Installing core/hab-pkg-export-tar/0.85.0
☁ Determining latest version of core/hab-pkg-export-tar/0.85.0 in the 'stable' channel
☛ Verifying core/hab-pkg-export-tar/0.85.0/20190916223634
» Installing core/hab-pkg-export-tar/0.85.0
☁ Determining latest version of core/hab-pkg-export-tar/0.85.0 in the 'stable' channel
☛ Verifying core/hab-pkg-export-tar/0.85.0/20190916223634
» Installing core/hab-pkg-export-tar/0.85.0
☁ Determining latest version of core/hab-pkg-export-tar/0.85.0 in the 'stable' channel
☛ Verifying core/hab-pkg-export-tar/0.85.0/20190916223634
» Installing core/hab-pkg-export-tar/0.85.0
☁ Determining latest version of core/hab-pkg-export-tar/0.85.0 in the 'stable' channel
☛ Verifying core/hab-pkg-export-tar/0.85.0/20190916223634
✗✗✗
✗✗✗ `hab-pkg-export-tar' was not found on the filesystem or in PATH
✗✗✗

When run with the sudo command, the pkg export succeeds as expected.
We should bubble up the real error message to the user when that userid lacks filesystem write permission.

This does not appear to affect hab pkg install .. command. In the same scenario, it fails with the expected and correct error message:

✗✗✗
✗✗✗ Permission denied (os error 13)
✗✗✗

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. We value your input and contribution. Please leave a comment if this issue still affects you.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. We value your input and contribution. Please leave a comment if this issue still affects you.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. We value your input and contribution. Please leave a comment if this issue still affects you.