treewide: a few more log_*_errno + return simplifications

[elogind.git] / src / sysctl / sysctl.c

diff --git a/src/sysctl/sysctl.c b/src/sysctl/sysctl.c
index 57112a7ef9eaf23c33f402f20948cb897f54f15e..2d1ae6e8b17e8677f1580a6268c0ffe18c7a24d0 100644 (file)
--- a/src/sysctl/sysctl.c
+++ b/src/sysctl/sysctl.c
@@ -38,22 +38,28 @@
 
 static char **arg_prefixes = NULL;
 
-static const char conf_file_dirs[] =
-        "/etc/sysctl.d\0"
-        "/run/sysctl.d\0"
-        "/usr/local/lib/sysctl.d\0"
-        "/usr/lib/sysctl.d\0"
-#ifdef HAVE_SPLIT_USR
-        "/lib/sysctl.d\0"
-#endif
-        ;
-
-static char *normalize_sysctl(char *s) {
+static const char conf_file_dirs[] = CONF_DIRS_NULSTR("sysctl");
+
+static char* normalize_sysctl(char *s) {
         char *n;
 
-        for (n = s; *n; n++)
+        n = strpbrk(s, "/.");
+        /* If the first separator is a slash, the path is
+         * assumed to be normalized and slashes remain slashes
+         * and dots remains dots. */
+        if (!n || *n == '/')
+                return s;
+
+        /* Otherwise, dots become slashes and slashes become
+         * dots. Fun. */
+        while (n) {
                 if (*n == '.')
                         *n = '/';
+                else
+                        *n = '.';
+
+                n = strpbrk(n + 1, "/.");
+        }
 
         return s;
 }
@@ -65,7 +71,7 @@ static int apply_sysctl(const char *property, const char *value) {
 
         log_debug("Setting '%s' to '%s'", property, value);
 
-        p = new(char, sizeof("/proc/sys/") + strlen(property));
+        p = new(char, strlen("/proc/sys/") + strlen(property) + 1);
         if (!p)
                 return log_oom();
 
@@ -123,13 +129,12 @@ static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_eno
 
         assert(path);
 
-        r = search_and_fopen_nulstr(path, "re", conf_file_dirs, &f);
+        r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f);
         if (r < 0) {
                 if (ignore_enoent && r == -ENOENT)
                         return 0;
 
-                log_error("Failed to open file '%s', ignoring: %s", path, strerror(-r));
-                return r;
+                return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path);
         }
 
         log_debug("parse: %s", path);
@@ -190,7 +195,7 @@ 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(-k));
+                        log_error_errno(k, "Failed to add sysctl variable %s to hashmap: %m", property);
                         free(property);
                         free(new_value);
                         return k;
@@ -200,16 +205,13 @@ static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_eno
         return r;
 }
 
-static int help(void) {
-
+static void help(void) {
         printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
                "Applies kernel sysctl settings.\n\n"
                "  -h --help             Show this help\n"
                "     --version          Show package version\n"
-               "     --prefix=PATH      Only apply rules that apply to paths with the specified prefix\n",
-               program_invocation_short_name);
-
-        return 0;
+               "     --prefix=PATH      Only apply rules with the specified prefix\n"
+               , program_invocation_short_name);
 }
 
 static int parse_argv(int argc, char *argv[]) {
@@ -231,12 +233,13 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
+        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 
                 switch (c) {
 
                 case 'h':
-                        return help();
+                        help();
+                        return 0;
 
                 case ARG_VERSION:
                         puts(PACKAGE_STRING);
@@ -245,13 +248,20 @@ static int parse_argv(int argc, char *argv[]) {
 
                 case ARG_PREFIX: {
                         char *p;
-                        char **l;
-
-                        for (p = optarg; *p; p++)
-                                if (*p == '.')
-                                        *p = '/';
 
-                        if (strv_extend(&arg_prefixes, optarg) < 0)
+                        /* We used to require people to specify absolute paths
+                         * in /proc/sys in the past. This is kinda useless, but
+                         * we need to keep compatibility. We now support any
+                         * sysctl name available. */
+                        normalize_sysctl(optarg);
+                        if (startswith(optarg, "/proc/sys"))
+                                p = strdup(optarg);
+                        else
+                                p = strappend("/proc/sys/", optarg);
+
+                        if (!p)
+                                return log_oom();
+                        if (strv_consume(&arg_prefixes, p) < 0)
                                 return log_oom();
 
                         break;
@@ -263,7 +273,6 @@ static int parse_argv(int argc, char *argv[]) {
                 default:
                         assert_not_reached("Unhandled option");
                 }
-        }
 
         return 1;
 }
@@ -282,7 +291,7 @@ int main(int argc, char *argv[]) {
 
         umask(0022);
 
-        sysctl_options = hashmap_new(string_hash_func, string_compare_func);
+        sysctl_options = hashmap_new(&string_hash_ops);
         if (!sysctl_options) {
                 r = log_oom();
                 goto finish;
@@ -304,7 +313,7 @@ int main(int argc, char *argv[]) {
 
                 r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
                 if (r < 0) {
-                        log_error("Failed to enumerate sysctl.d files: %s", strerror(-r));
+                        log_error_errno(r, "Failed to enumerate sysctl.d files: %m");
                         goto finish;
                 }