Add feature: deno-cache.

Author: CodeMan99

src/deno-cache/NOTES.md

@@ -0,0 +1,6 @@
+# Deno Cache
+
+Setup the [deno cache](https://jsr.io/@deno/cache-dir) as a volume.
+
+Intended for usage with the `denoland/deno:debian` docker image. Otherwise,
+will create a `deno` group with read-write permissions on the cache directory.

src/deno-cache/devcontainer-feature.json

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+{
+    "id": "deno-cache",
+    "name": "Deno cache setup",
+    "version": "0.1.0",
+    "containerEnv": {
+        "DENO_DIR": "/deno-dir"
+    },
+    "options": {
+        "username": {
+            "description": "Add the 'deno' group to the given non-root user. Defaults to the value of `remoteUser`.",
+            "default": "automatic",
+            "type": "string"
+        }
+    },
+    "mounts": [
+        {
+            "source": "deno-cache-${devcontainerId}",
+            "target": "/deno-dir",
+            "type": "volume"
+        }
+    ],
+    "installsAfter": [
+        "ghcr.io/devcontainers/features/common-utils"
+    ]
+}

src/deno-cache/install.sh

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+#!/usr/bin/env bash
+
+set -e
+
+GROUP=deno
+
+echo "Creating cache directory: $DENO_DIR"
+mkdir --parents "$DENO_DIR"
+
+echo "Creating user group: $GROUP"
+groupadd --force --key GID_MIN=1993 "$GROUP"
+
+echo "Assigning group to cache directory..."
+chgrp --changes --recursive "$GROUP" "$DENO_DIR"
+
+echo "Assigning permissions with sticky group..."
+chmod --changes --recursive 2775     "$DENO_DIR"
+
+echo "Appending group ${GROUP@Q} to user..."
+if [[ "$USERNAME" == "automatic" ]]; then
+    usermod --append --groups "$GROUP" "$_REMOTE_USER"
+elif [[ -n "$USERNAME" && "$USERNAME" != "root" ]]; then
+    usermod --append --groups "$GROUP" "$USERNAME"
+fi

test/deno-cache/denoland_deno__debian__custom_user.sh

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+#!/bin/bash
+
+set -e
+
+source dev-container-features-test-lib
+
+check "Group exists" getent group deno
+check "Directory /deno-dir exists" test -d "$DENO_DIR"
+check "Group is set" test "$(stat --printf="%G" "$DENO_DIR")" == "deno"
+check "Permissions are set" test "$(stat --printf="%a" "$DENO_DIR")" -eq 2775
+check "Remote user is in the deno group" bash -c "getent group deno | grep jsr"
+check "Run deno info" deno info "jsr:@deno/cache-dir"
+
+reportResults

test/deno-cache/scenarios.json

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+{
+    "denoland_deno__debian__custom_user": {
+        "image": "denoland/deno:debian",
+        "remoteUser": "jsr",
+        "features": {
+            "deno-cache": {},
+            "ghcr.io/devcontainers/features/common-utils:2": {
+                "username": "jsr"
+            }
+        }
+    }
+}

test/deno-cache/test.sh

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+#!/bin/bash
+
+set -e
+
+source dev-container-features-test-lib
+
+check "Group exists" getent group deno
+check "Directory /deno-dir exists" test -d "$DENO_DIR"
+check "Group is set" test "$(stat --printf="%G" "$DENO_DIR")" == "deno"
+check "Permissions are set" test "$(stat --printf="%a" "$DENO_DIR")" -eq 2775
+
+reportResults