output file is able to outside of output directory

[loynoir]

Story

Not a use case.
But just as a jsonnet starter, wonder what is I set output key begins with "/" and "..".
Seems there are two different logic.

1. "/" is chroot-jail alike
2. ".." is NOT chroot-jail alike

Don't know if it is a bug or a feature. So here I am.

Reproduce

$ cat foo.jsonnet 
{
  "a.json": {
    "a": 42
  },
  "/tmp/b.json": {
    "a": 42
  },
  "../c.json": {
    "a": 42
  }
}

Actual

'../c.json' is outside of 'dist'

$ jsonnet -c -m dist foo.jsonnet
dist/../c.json
dist//tmp/b.json
dist/a.json
$ tree
.
├── c.json
├── dist
│   ├── a.json
│   └── tmp
│       └── b.json
└── foo.jsonnet

Expected

'../c.json' is within of 'dist'

$ jsonnet -c -m dist foo.jsonnet
dist/c.json
dist//tmp/b.json
dist/a.json
$ tree
.
├── dist
│   ├── c.json
│   ├── a.json
│   └── tmp
│       └── b.json
└── foo.jsonnet

[sbarzowski]

Hmmm... I think it should never be able to escape the output dir. I'm going to mark this as a bug.