Add glob support for extra file permissions

[TadCordle]

Fixes #1200.

Can now use glob patterns when setting extra files permissions. Permissions configured with explicit paths will take priority over globs (e.g. if both '/a/b/file': '777' and '**/file': '444' are configured, /a/b/file will have 777 permissions, and all other files named file will have 444 permissions).

If a file matches multiple globs (e.g. if there's a file /a/b/file, and permissions are configured for both /a/b/* and **/file), behavior is undefined at the moment first configured match wins.

[loosebazooka]

However, if a file matches multiple globs (e.g. if there's a file /a/b/file, and permissions are configured for both /a/b/* and **/file), behavior is undefined at the moment. Maybe we should sort the entry set or something when searching for matches so the behavior is more predictable?

It should be deterministic, like last configured pattern wins.

[TadCordle]

Actually, looks like Groovy maps are LinkedHashMaps, so behavior should already be predictable (first match wins). But if you think last match wins is better UX we can do that.

[loosebazooka]

Oh actually I don't know, it was just a suggestion. I was thinking we apply all rules we find to a file, but it seems like we go looking for matches and apply the first one we find -- which actually makes sense.

Should the pattern only match files? Can we accidentally end up making directories un-traversable?

[TadCordle]

We still traverse over every file/directory, but some glob patterns could end up being completely skipped. e.g. this will set everything to 777:

extraDirectories {
  permissions = [
    '/**': '777',
    '/a/**': '444'
  ]
}

But I think you can avoid this by just configuring the more specific patterns first. And again, if you configure permissions on files/directories without using a glob, those will override any permissions set using globs.

[loosebazooka]

And again, if you configure permissions on files/directories without using a glob, those will override any permissions set using globs.

so order doesn't matter for those?

[TadCordle]

Correct.

[TadCordle]

Actually, since we take the map from the gradle config and put it in a new map, we might not be maintaining order... will fix.