From 4465f7686194b9da8d1cf1a0e5813b794b84aa38 Mon Sep 17 00:00:00 2001
From: Bernard Blackham <b-gitcommits@largestprime.net>
Date: Mon, 21 Jan 2013 02:50:15 +0000
Subject: [PATCH] Isolate: Add chdir flag. Repurpose --cg shorthand flag.

Using -c is consistent with mo-box.
---
 isolate/isolate.1.txt |  6 +++++-
 isolate/isolate.c     | 11 ++++++++++-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/isolate/isolate.1.txt b/isolate/isolate.1.txt
index b3252de..f59dadf 100644
--- a/isolate/isolate.1.txt
+++ b/isolate/isolate.1.txt
@@ -92,6 +92,10 @@ OPTIONS
 	Redirect standard error output to 'file'. The 'file' has to be accessible
 	inside the sandbox.
 
+*-c, --chdir=*'dir'::
+	Change directory to 'dir' before executing the program. This path must be
+	relative to the root of the sandbox.
+
 *-p, --processes*[*=*'max']::
 	Permit the program to create up to 'max' processes and/or threads. Please
 	keep in mind that time and memory limit do not work with multiple processes
@@ -169,7 +173,7 @@ to constrain programs consisting of multiple processes. Please note
 that this feature needs special system setup described in the REQUIREMENTS
 section.
 
-*-c, --cg*::
+*--cg*::
 	Enable use of control groups.
 
 *--cg-mem=*'size'::
diff --git a/isolate/isolate.c b/isolate/isolate.c
index 16ea06e..1131ddb 100644
--- a/isolate/isolate.c
+++ b/isolate/isolate.c
@@ -47,6 +47,7 @@ static int block_quota;
 static int inode_quota;
 static int max_processes = 1;
 static char *redir_stdin, *redir_stdout, *redir_stderr;
+static char *set_cwd;
 
 static int cg_enable;
 static int cg_memory_limit;
@@ -1134,6 +1135,9 @@ box_inside(void *arg)
   setup_rlimits();
   char **env = setup_environment();
 
+  if (set_cwd && chdir(set_cwd))
+    die("chdir: %m");
+
   execve(args[0], args, env);
   die("execve(\"%s\"): %m", args[0]);
 }
@@ -1287,6 +1291,7 @@ enum opt_code {
   OPT_RUN,
   OPT_CLEANUP,
   OPT_VERSION,
+  OPT_CG,
   OPT_CG_MEM,
   OPT_CG_TIMING,
 };
@@ -1295,7 +1300,8 @@ static const char short_opts[] = "b:c:d:eE:i:k:m:M:o:p::q:r:t:vw:x:";
 
 static const struct option long_opts[] = {
   { "box-id",		1, NULL, 'b' },
-  { "cg",		1, NULL, 'c' },
+  { "chdir",		1, NULL, 'c' },
+  { "cg",		0, NULL, OPT_CG },
   { "cg-mem",		1, NULL, OPT_CG_MEM },
   { "cg-timing",	0, NULL, OPT_CG_TIMING },
   { "cleanup",		0, NULL, OPT_CLEANUP },
@@ -1336,6 +1342,9 @@ main(int argc, char **argv)
 	box_id = atoi(optarg);
 	break;
       case 'c':
+	set_cwd = optarg;
+	break;
+      case OPT_CG:
 	cg_enable = 1;
 	break;
       case 'd':
-- 
2.39.2