Add ruby

.gitignore

@@ -1,3 +1,3 @@
 /app
-/containers/perl/rootfs/
+/containers/*/rootfs/
 /static.go

build-langs

@@ -2,6 +2,7 @@
 
 docker pull alpine:edge
 
+# Perl
 cd containers/perl
 
 docker build -t perl-build .
@@ -19,3 +20,19 @@ sudo chown -R $USER: rootfs
 
 find rootfs/usr/lib -name '*.h'   -delete
 find rootfs/usr/lib -name '*.pod' -delete
+
+# Ruby
+cd containers/ruby
+
+docker build -t ruby-build .
+
+id=`docker run -d ruby-build true`
+
+mkdir -p rootfs/lib rootfs/usr/{bin,lib}
+
+docker cp $id:/lib/ld-musl-x86_64.so.1 rootfs/lib
+docker cp $id:/usr/bin/ruby            rootfs/usr/bin
+docker cp $id:/usr/lib/ruby            rootfs/usr/lib
+docker rm $id
+
+sudo chown -R $USER: rootfs

code-golf.go

@@ -194,6 +194,7 @@ func runCode(lang, code string) string {
 		Args:   []string{"runc", "start", "id"},
 		Dir:    "containers/" + lang,
 		Path:   "/usr/bin/runc",
+		Stderr: os.Stdout,
 		Stdin:  strings.NewReader(code),
 		Stdout: &out,
 	}

containers/ruby/Dockerfile

@@ -0,0 +1,13 @@
+FROM alpine:edge
+
+RUN apk add --no-cache curl gcc linux-headers make musl-dev
+
+RUN curl https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.1.tar.xz \
+  | tar xJf -
+
+RUN cd ruby-2.4.1         \
+ && ./configure           \
+    --disable-install-doc \
+    --prefix=/usr         \
+ && make                  \
+ && make install

containers/ruby/config.json

@@ -0,0 +1,144 @@
+{
+	"process": {
+		"user": {},
+		"args": [
+			"/usr/bin/ruby"
+		],
+		"cwd": "/",
+		"capabilities": [
+			"CAP_AUDIT_WRITE",
+			"CAP_KILL",
+			"CAP_NET_BIND_SERVICE"
+		],
+		"rlimits": [
+			{
+				"type": "RLIMIT_NOFILE",
+				"hard": 1024,
+				"soft": 1024
+			}
+		],
+		"noNewPrivileges": true
+	},
+	"root": {
+		"path": "rootfs",
+		"readonly": true
+	},
+	"hostname": "ruby",
+	"mounts": [
+		{
+			"destination": "/proc",
+			"type": "proc",
+			"source": "proc"
+		},
+		{
+			"destination": "/dev",
+			"type": "tmpfs",
+			"source": "tmpfs",
+			"options": [
+				"nosuid",
+				"strictatime",
+				"mode=755",
+				"size=65536k"
+			]
+		},
+		{
+			"destination": "/dev/pts",
+			"type": "devpts",
+			"source": "devpts",
+			"options": [
+				"nosuid",
+				"noexec",
+				"newinstance",
+				"ptmxmode=0666",
+				"mode=0620",
+				"gid=5"
+			]
+		},
+		{
+			"destination": "/dev/shm",
+			"type": "tmpfs",
+			"source": "shm",
+			"options": [
+				"nosuid",
+				"noexec",
+				"nodev",
+				"mode=1777",
+				"size=65536k"
+			]
+		},
+		{
+			"destination": "/dev/mqueue",
+			"type": "mqueue",
+			"source": "mqueue",
+			"options": [
+				"nosuid",
+				"noexec",
+				"nodev"
+			]
+		},
+		{
+			"destination": "/sys",
+			"type": "sysfs",
+			"source": "sysfs",
+			"options": [
+				"nosuid",
+				"noexec",
+				"nodev",
+				"ro"
+			]
+		},
+		{
+			"destination": "/sys/fs/cgroup",
+			"type": "cgroup",
+			"source": "cgroup",
+			"options": [
+				"nosuid",
+				"noexec",
+				"nodev",
+				"relatime",
+				"ro"
+			]
+		}
+	],
+	"linux": {
+		"resources": {
+			"devices": [
+				{
+					"allow": false,
+					"access": "rwm"
+				}
+			]
+		},
+		"namespaces": [
+			{
+				"type": "pid"
+			},
+			{
+				"type": "network"
+			},
+			{
+				"type": "ipc"
+			},
+			{
+				"type": "uts"
+			},
+			{
+				"type": "mount"
+			}
+		],
+		"maskedPaths": [
+			"/proc/kcore",
+			"/proc/latency_stats",
+			"/proc/timer_stats",
+			"/proc/sched_debug"
+		],
+		"readonlyPaths": [
+			"/proc/asound",
+			"/proc/bus",
+			"/proc/fs",
+			"/proc/irq",
+			"/proc/sys",
+			"/proc/sysrq-trigger"
+		]
+	}
+}

examples.go

@@ -75,5 +75,6 @@ var examples = map[string]string{
         print("Fizz\n")
     else
         print("#{number}\n")
+    end
 end`,
 }