snapcraft builds a snap that won't install if + is in the name

[Ben Romer]

If you build a snap with plus (+) in the snap name, the resulting snap file cannot be installed.

$ snapcraft init
Created snap/snapcraft.yaml.
Edit the file to your liking or run `snapcraft` to get started
$ cd snap/
$ ls
snapcraft.yaml
$ vi snapcraft.yaml

Change the name of the snap to something with a plus.

$ cat snapcraft.yaml
name: snap+bug # you probably want to 'snapcraft register <name>'
version: '0.1' # just for humans, typically '1.2+git' or '1.3.2'
summary: Single-line elevator pitch for your amazing snap # 79 char long summary
description: |
  This is my-snap's description. You have a paragraph or two to tell the
  most important story about your snap. Keep it under 100 words though,
  we live in tweetspace and your description wants to look good in the snap
  store.

grade: devel # must be 'stable' to release into candidate/stable channels
confinement: devmode # use 'strict' once you have the right plugs and slots

parts:
  my-part:
    # See 'snapcraft plugins'
    plugin: nil

$ snapcraft
Preparing to pull my-part
Pulling my-part
Preparing to build my-part
Building my-part
Staging my-part
Priming my-part
Snapping 'snap+bug' |
Snapped snap+bug_0.1_amd64.snap

Try to install it.

$ snap install --dangerous snap+bug_0.1_amd64.snap
error: cannot read snap file: invalid snap name: "snap+bug"

[Cris Dywan (kalikiana)]

schema/snapcraft.yaml currently allows + in the pattern for the "name" property. This should be removed from the regular expression.

[Kyle Fazzari (kyrofa)]

Fix proposed here: https://github.com/snapcore/snapcraft/pull/1622#pullrequestreview-69759626