[libvirt] [PATCH] Ensure virExec preserves logging environment

[Daniel P. Berrange]

The virFork call resets all logging handlers that may have been
set. Re-enable them after fork in virExec, so that env variables
fir LIBVIRT_LOG_OUTPUTS and LIBVIRT_LOG_FILTERS take effect
until the execve()

* src/util/util.c: Preserve logging in child in virExec
---
 src/util/util.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/util/util.c b/src/util/util.c
index f2fe58a..a0849e1 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -602,6 +602,9 @@ __virExec(const char *const*argv,
         childout = -1;
     }
 
+    /* Initialize full logging for a while */
+    virLogSetFromEnv();
+
     /* Daemonize as late as possible, so the parent process can detect
      * the above errors with wait* */
     if (flags & VIR_EXEC_DAEMON) {
@@ -650,6 +653,9 @@ __virExec(const char *const*argv,
         virClearCapabilities() < 0)
         goto fork_error;
 
+    /* Close logging again to ensure no FDs leak to child */
+    virLogReset();
+
     if (envp)
         execve(argv[0], (char **) argv, (char**)envp);
     else
-- 
1.7.2.3