[scponly] Unison in chroot environment

[Martin Werthmoeller]

Hi *,

I found a little bug at scponly-4.3. A setup with unison in a chroot
environment will fail.

Unison needs the $HOME environment variable be set to the directory where
the .unison directory resides. At the jail this directory must be
accessible from the current root dir.

I've attached a patch where the $HOME variable will be set to '/' if it is
called with chroot.

The patch was tested at a current debian system (Kernel 2.6.8, glibc
2.3.2).
  It contains only the changes at scponly.c. The setup_chroot.sh shell
script should probably changed to create a .unison directory with write
permissions for the chrooted user at the root directory of the chroot
environment.

Best regards,
Martin Werthmoeller

-- 
LWsystems - IT-Service and Consulting
mw at lw-systems.de * http://www.lw-systems.de
-------------- next part --------------
--- scponly.c	2005-12-27 22:55:52.000000000 +0100
+++ scponly.c_mw	2006-01-07 17:53:49.513141746 +0100
@@ -579,6 +579,23 @@
 	if (valid_arg_vector(av))
 	{
 
+/**
+ * Unison needs the HOME environment variable be set to the directory
+ * where the .unison directory resides.
+ */
+#ifdef UNISON_COMPAT
+		if (chrooted)
+		{
+			if (setenv("HOME","/",1))
+			{
+				syslog(LOG_ERR, "could not set HOME environment variable(%s))", logstamp());
+				exit(EXIT_FAILURE);
+			}
+			if (debuglevel)
+				syslog(LOG_DEBUG, "set HOME environment variable to /", homedir, logstamp());
+		}
+#endif
+
 #ifdef USE_SAFE_ENVIRONMENT
 		safeenv[0] = NULL;
 		filter_allowed_env_vars();