Merge lp:~jamesodhunt/upstart/handle-no-home-var into lp:upstart

[James Hunt]

Currently, if $HOME is unset and upstart is run as a Session Init, it will spin at 100% CPU,due to the following in main():

592 dirs = NIH_MUST (get_user_upstart_dirs ());

We could just change that logic, but a better approach is to query the password database to determine the users home directory as that is a more reliable method anyway.

[Dimitri John Ledkov (xnox)]

user-session init shouldn't be started without $HOME set in the environment. getpwent call can block on looking up NIS/ldap, and the expectation is that by the time upstart --user is run $HOME is properly available.

upstart as PID 2 shoudn't be running with --user flag, as we don't want /root/.config/upstart config dir nor logs in /root/.cache/upstart. We want it to read /etc/init and log into /var/log/upstart.

review: Disapprove

Unmerged revisions

1612. By James Hunt on 2014-03-12

* init/xdg.c: get_home_subdir() Try harder to establish users home
  directory to handle environments where $HOME may not be set.
* init/tests/test_xdg.c: Updated tests based on new safer behaviour of
  get_home_subdir().

=== modified file 'ChangeLog'
--- ChangeLog	2014-03-11 14:44:56 +0000
+++ ChangeLog	2014-03-12 14:34:54 +0000
@@ -1,3 +1,10 @@
[phone]  James Hunt  <[e-mail]>
+
+	* init/xdg.c: get_home_subdir() Try harder to establish users home
+	  directory to handle environments where $HOME may not be set.
+	* init/tests/test_xdg.c: Updated tests based on new safer behaviour of 
+	  get_home_subdir().
+
 2014-03-11  James Hunt  <[e-mail]>
 
 	* NEWS: Release 1.12.1
 
=== modified file 'init/tests/test_xdg.c'
--- init/tests/test_xdg.c	2013-11-12 12:17:30 +0000
+++ init/tests/test_xdg.c	2014-03-12 14:34:54 +0000
@@ -53,11 +53,19 @@
 	TEST_FUNCTION ("get_home_subdir");
 
 	TEST_FEATURE ("with HOME not set");
+	/* It should be possible to establish the home directory (via
+	 * the password database) even if $HOME is not set.
+	 */
 	TEST_EQ (unsetenv ("HOME"), 0);
 
 	TEST_ALLOC_FAIL {
 		dir = get_home_subdir ("test", FALSE);
-		TEST_EQ_P (dir, NULL);
+		if (test_alloc_failed) {
+			TEST_EQ_P (dir, NULL);
+		} else {
+			TEST_NE_P (dir, NULL);
+			nih_free (dir);
+		}
 	}
 
 	TEST_FEATURE ("with HOME set");
@@ -212,7 +220,12 @@
 	TEST_ALLOC_FAIL {
 		outname = NULL;
 		outname = function ();
-		TEST_EQ_P (outname, NULL);
+		if (test_alloc_failed) {
+			TEST_EQ_P (outname, NULL);
+		} else {
+			TEST_NE_P (outname, NULL);
+			nih_free (outname);
+		}
 	}
 
 	TEST_FEATURE ("without HOME set and without environment override");
@@ -220,7 +233,12 @@
 	TEST_ALLOC_FAIL {
 		outname = NULL;
 		outname = function ();
-		TEST_EQ_P (outname, NULL);
+		if (test_alloc_failed) {
+			TEST_EQ_P (outname, NULL);
+		} else {
+			TEST_NE_P (outname, NULL);
+			nih_free (outname);
+		}
 	}
 }
 
 
=== modified file 'init/xdg.c'
--- init/xdg.c	2013-11-16 12:42:57 +0000
+++ init/xdg.c	2014-03-12 14:34:54 +0000
@@ -26,6 +26,8 @@
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <sys/types.h>
+#include <pwd.h>
 
 #include <nih/alloc.h>
 #include <nih/logging.h>
@@ -85,13 +87,25 @@
 char *
 get_home_subdir (const char *suffix, int create)
 {
-	char *env;
+	char          *env;
+	struct passwd *pw;
 
 	env = getenv ("HOME");
-	if (! env)
-		return NULL;
-
+	if (env)
+		goto out;
+
+	pw = getpwent ();
+	if (! pw)
+		return NULL;
+
+	if (! pw->pw_dir)
+		return NULL;
+
+	env = pw->pw_dir;
+
+out:
 	return get_subdir (env, suffix, create);
+
 }
 
 /**