From e3435020cb50691abac53965a7ddf6f66991926f Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay@vrfy.org>
Date: Thu, 15 Aug 2013 18:35:03 +0200
Subject: [PATCH] sysctl: allow overwriting of values specified in "later"
 files

---
 NEWS                            |  9 +++++++++
 src/sysctl/sysctl.c             | 16 ++++++++--------
 units/systemd-sysctl.service.in |  1 -
 3 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/NEWS b/NEWS
index f9929d0..9d989d3 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,15 @@ systemd System and Service Manager
 
 CHANGES WITH 206:
 
+        * The systemd-sysctl tool does no longer natively read the
+          file /etc/sysctl.conf. If desired, the file should be
+          symlinked from /etc/sysctl.d/99-sysctl.conf. Apart from
+          providing legacy support by a symlink rather than built-in
+          code, it also makes the otherwise hidden order of application
+          of the different files visible.
+
+CHANGES WITH 206:
+
         * The documentation has been updated to cover the various new
           concepts introduced with 205.
 
diff --git a/src/sysctl/sysctl.c b/src/sysctl/sysctl.c
index db18dd9..b5670db 100644
--- a/src/sysctl/sysctl.c
+++ b/src/sysctl/sysctl.c
@@ -135,6 +135,7 @@ static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_eno
         log_debug("parse: %s\n", path);
         while (!feof(f)) {
                 char l[LINE_MAX], *p, *value, *new_value, *property, *existing;
+                void *v;
                 int k;
 
                 if (!fgets(l, sizeof(l), f)) {
@@ -167,13 +168,14 @@ static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_eno
                 p = normalize_sysctl(strstrip(p));
                 value = strstrip(value);
 
-                existing = hashmap_get(sysctl_options, p);
+                existing = hashmap_get2(sysctl_options, p, &v);
                 if (existing) {
-                        if (!streq(value, existing))
-                                log_warning("Duplicate assignment of %s in file '%s', ignoring.",
-                                            p, path);
+                        if (streq(value, existing))
+                                continue;
 
-                        continue;
+                        log_info("Overwriting earlier assignment of %s in file '%s'.", p, path);
+                        free(hashmap_remove(sysctl_options, p));
+                        free(v);
                 }
 
                 property = strdup(p);
@@ -188,7 +190,7 @@ static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_eno
 
                 k = hashmap_put(sysctl_options, property, new_value);
                 if (k < 0) {
-                        log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-r));
+                        log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-k));
                         free(property);
                         free(new_value);
                         return k;
@@ -304,8 +306,6 @@ int main(int argc, char *argv[]) {
                         goto finish;
                 }
 
-                r = parse_file(sysctl_options, "/etc/sysctl.conf", true);
-
                 STRV_FOREACH(f, files) {
                         k = parse_file(sysctl_options, *f, true);
                         if (k < 0 && r == 0)
diff --git a/units/systemd-sysctl.service.in b/units/systemd-sysctl.service.in
index 45e1ceb..5baf22c 100644
--- a/units/systemd-sysctl.service.in
+++ b/units/systemd-sysctl.service.in
@@ -13,7 +13,6 @@ Conflicts=shutdown.target
 After=systemd-readahead-collect.service systemd-readahead-replay.service
 Before=sysinit.target shutdown.target
 ConditionPathIsReadWrite=/proc/sys/
-ConditionPathExists=|/etc/sysctl.conf
 ConditionDirectoryNotEmpty=|/lib/sysctl.d
 ConditionDirectoryNotEmpty=|/usr/lib/sysctl.d
 ConditionDirectoryNotEmpty=|/usr/local/lib/sysctl.d