From dfbd4e69bad07303f3bfcf3fe25dbe317fb5cf04 Mon Sep 17 00:00:00 2001
From: Nicolas Geniteau <nicolas@acu.epita.fr>
Date: Tue, 5 Nov 2013 17:29:06 +0100
Subject: [PATCH] ACU::Jail

---
 ACU/Jail.pm | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 ACU/Jail.pm

diff --git a/ACU/Jail.pm b/ACU/Jail.pm
new file mode 100644
index 0000000..3139925
--- /dev/null
+++ b/ACU/Jail.pm
@@ -0,0 +1,71 @@
+#! /usr/bin/env perl
+
+package Jail;
+
+use v5.10.1;
+use strict;
+use warnings;
+use Carp;
+use File::Temp qw(tempdir);
+use File::Path qw(remove_tree);
+use File::Copy::Recursive qw(dircopy);
+
+use ACU::Log;
+
+use constant {
+  JAILS_DIR => "/jail/",
+  RULESET_NO => 4,
+};
+
+sub run_command
+{
+    my $jail = shift;
+    my $command = shift;
+    my $readonly = shift;
+    my $work_dir = shift;
+
+    # Verifications
+    croak JAILS_DIR . "$jail doesn't exist." unless ( -d JAILS_DIR . $jail);
+    croak JAILS_DIR . "$jail/data doesn't exist." unless ( -d JAILS_DIR . "$jail/data");
+
+    
+    my $jail_path = JAILS_DIR . $jail;
+    my $mounts = "";
+    if ($readonly) {
+        $jail_path = tempdir();
+        $mounts  = "mount='" . JAILS_DIR . "$jail $jail_path nullfs ro 0 0' ";
+    }
+
+    $mounts .= "mount='tmpfs $jail_path/tmp tmpfs rw,mode=777 0 0' ";
+
+    my $jail_data_path = "$jail_path/data";
+
+    # Creating the working directory
+    if (defined ($work_dir) and $work_dir ne "") {
+        $mounts .= "mount='$work_dir $jail_data_path nullfs rw 0 0' ";
+    }
+
+    # Create and start jail
+    my $jail_cmd = "jail -c path='$jail_path' ";
+    $jail_cmd   .= "persist=false ";
+    $jail_cmd   .= "devfs_ruleset=". RULESET_NO ." ";
+    $jail_cmd   .= "$mounts";
+    if (defined ($work_dir) and $work_dir ne "") {
+        $jail_cmd   .= "exec.start='cd $jail_data_path && $command'";
+    } else {
+        $jail_cmd   .= "exec.start='$command'";
+    }
+    system($jail_cmd);
+    croak "Error while executing '$jail_cmd'" if ($?);
+
+    # Force umount
+    system("umount -f $jail_path/tmp");
+    if (defined ($work_dir) and $work_dir ne "") {
+        system("umount -f $jail_data_path");
+    }
+    if ($readonly) {
+        system("umount -f $jail_path");
+    }
+}
+
+1;