From 47fd864adf60f70628e516d933c859229ff70912 Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@collectd.org>
Date: Thu, 21 Sep 2017 17:18:05 +0200
Subject: [PATCH] src/daemon/collectd.c: Fix implementation of the -B option.

Also add a manual page entry.

Issue: #2421
Pull-Request: #2422
---
 src/collectd.pod      |  8 +++++++-
 src/daemon/collectd.c | 26 ++++++++++++--------------
 2 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/src/collectd.pod b/src/collectd.pod
index 8e68fc01..1dd899b8 100644
--- a/src/collectd.pod
+++ b/src/collectd.pod
@@ -40,11 +40,17 @@ the read callbacks once. A return code not equal to zero indicates an error.
 
 =item B<-P> I<E<lt>pid-fileE<gt>>
 
-Specify an alternative pid file. This overwrites any settings in the config 
+Specify an alternative pid file. This overwrites any settings in the config
 file. This is thought for init-scripts that require the PID-file in a certain
 directory to work correctly. For everyday-usage use the B<PIDFile>
 config-option.
 
+=item B<-B>
+
+If set, collectd will I<not> try to create its base directory. If the base
+directory does not exist, it will exit rather than trying to create the
+directory.
+
 =item B<-f>
 
 Don't fork to the background. I<collectd> will also B<not> close standard file
diff --git a/src/daemon/collectd.c b/src/daemon/collectd.c
index dfd05ce2..af8fb568 100644
--- a/src/daemon/collectd.c
+++ b/src/daemon/collectd.c
@@ -158,7 +158,7 @@ static int init_global_variables(void) {
   return 0;
 } /* int init_global_variables */
 
-static int change_basedir(const char *orig_dir, int nocreate) {
+static int change_basedir(const char *orig_dir, _Bool create) {
   char *dir;
   size_t dirlen;
   int status;
@@ -183,7 +183,7 @@ static int change_basedir(const char *orig_dir, int nocreate) {
   if (status == 0) {
     free(dir);
     return 0;
-  } else if (errno != ENOENT) {
+  } else if (!create || (errno != ENOENT)) {
     char errbuf[1024];
     ERROR("change_basedir: chdir (%s): %s", dir,
           sstrerror(errno, errbuf, sizeof(errbuf)));
@@ -191,15 +191,13 @@ static int change_basedir(const char *orig_dir, int nocreate) {
     return -1;
   }
 
-  if (nocreate == 0) {
-    status = mkdir(dir, S_IRWXU | S_IRWXG | S_IRWXO);
-    if (status != 0) {
-      char errbuf[1024];
-      ERROR("change_basedir: mkdir (%s): %s", dir,
-            sstrerror(errno, errbuf, sizeof(errbuf)));
-      free(dir);
-      return -1;
-    }
+  status = mkdir(dir, S_IRWXU | S_IRWXG | S_IRWXO);
+  if (status != 0) {
+    char errbuf[1024];
+    ERROR("change_basedir: mkdir (%s): %s", dir,
+          sstrerror(errno, errbuf, sizeof(errbuf)));
+    free(dir);
+    return -1;
   }
 
   status = chdir(dir);
@@ -462,7 +460,7 @@ int main(int argc, char **argv) {
   int test_config = 0;
   int test_readall = 0;
   const char *basedir;
-  int basedir_nocreate = 0;
+  _Bool opt_create_basedir = 1;
 #if COLLECT_DAEMON
   pid_t pid;
   int daemonize = 1;
@@ -484,7 +482,7 @@ int main(int argc, char **argv) {
 
     switch (c) {
     case 'B':
-      basedir_nocreate = 1;
+      opt_create_basedir = 0;
       break;
     case 'C':
       configfile = optarg;
@@ -540,7 +538,7 @@ int main(int argc, char **argv) {
     fprintf(stderr,
             "Don't have a basedir to use. This should not happen. Ever.");
     return 1;
-  } else if (change_basedir(basedir, basedir_nocreate)) {
+  } else if (change_basedir(basedir, opt_create_basedir)) {
     fprintf(stderr, "Error: Unable to change to directory `%s'.\n", basedir);
     return 1;
   }
-- 
2.11.0