Node snaps don't work out of the box with classic confinement

[Evan]

Snapcraft puts $SNAP/bin on $PATH when creating a strictly confined snap, but not on classic. This means that classic snaps using the node plugin won't find node out of the box:

$ heroku
/snap/heroku/485/bin/heroku: line 19: node: command not found

You have to explicitly include $SNAP/bin on the $PATH:

$ git diff
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index 4caa0d5..1fbd2ac 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -8,7 +8,7 @@ confinement: classic

 apps:
     heroku:
- command: bin/heroku
+ command: env PATH=$SNAP/bin:$PATH heroku

 parts:
   hello-node-snap:

This is not discoverable. It requires understanding of the internals of classic confinement.

[Sergio Schvezov (sergiusens)]

This is because classic is just hard, you would need to compile your interpreter for this to work transparently. I am guessing this is because bin/heroku has a wrong shebang.