continue work with error messages, log_oom()

Adds messages for formally silent errors: new "Failed on cmdline argument %s: %s".

Removes some specific error messages for -ENOMEM in mount-setup.c. A few specific
ones have been left in other binaries.

5 files changed, 33 insertions, 26 deletions

diff --git a/TODO b/TODO
index 41d09434e6..6dc36cb99d 100644
--- a/TODO
+++ b/TODO
@@ -479,7 +479,7 @@ Regularly:
 
 * Use PR_SET_PROCTITLE_AREA if it becomes available in the kernel
 
-* %m in printf() instead of strerror();
+* %m in printf() instead of strerror(errno);
 
 * pahole
 
diff --git a/src/binfmt/binfmt.c b/src/binfmt/binfmt.c
index 0399ab75e0..788fd4b1a4 100644
--- a/src/binfmt/binfmt.c
+++ b/src/binfmt/binfmt.c
@@ -40,7 +40,7 @@ static int delete_rule(const char *rule) {
         assert(rule[0]);
 
         if (!(x = strdup(rule)))
-                return -ENOMEM;
+                return log_oom();
 
         e = strchrnul(x+1, x[0]);
         *e = 0;
@@ -49,7 +49,7 @@ static int delete_rule(const char *rule) {
         free(x);
 
         if (!fn)
-                return -ENOMEM;
+                return log_oom();
 
         r = write_one_line_file(fn, "-1");
         free(fn);
diff --git a/src/cgtop/cgtop.c b/src/cgtop/cgtop.c
index a57a468b2c..3756328fa7 100644
--- a/src/cgtop/cgtop.c
+++ b/src/cgtop/cgtop.c
@@ -782,5 +782,10 @@ finish:
         group_hashmap_free(a);
         group_hashmap_free(b);
 
-        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+        if (r < 0) {
+                log_error("Exiting with failure: %s", strerror(-r));
+                return EXIT_FAILURE;
+        }
+
+        return EXIT_SUCCESS;
 }
diff --git a/src/core/main.c b/src/core/main.c
index 1326b94f68..3c0f5f9a94 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -168,12 +168,12 @@ _noreturn_ static void crash(int sig) {
 
                 pid = fork();
                 if (pid < 0)
-                        log_error("Failed to fork off crash shell: %s", strerror(errno));
+                        log_error("Failed to fork off crash shell: %m");
                 else if (pid == 0) {
                         make_console_stdio();
                         execl("/bin/sh", "/bin/sh", NULL);
 
-                        log_error("execl() failed: %s", strerror(errno));
+                        log_error("execl() failed: %m");
                         _exit(1);
                 }
 
@@ -350,12 +350,12 @@ static int parse_proc_cmdline_word(const char *word) {
                 if (!eq) {
                         r = unsetenv(cenv);
                         if (r < 0)
-                                log_warning("unsetenv failed %s. Ignoring.", strerror(errno));
+                                log_warning("unsetenv failed %m. Ignoring.");
                 } else {
                         *eq = 0;
                         r = setenv(cenv, eq + 1, 1);
                         if (r < 0)
-                                log_warning("setenv failed %s. Ignoring.", strerror(errno));
+                                log_warning("setenv failed %m. Ignoring.");
                 }
                 free(cenv);
 
@@ -495,14 +495,14 @@ static int config_parse_cpu_affinity2(
                 unsigned cpu;
 
                 if (!(t = strndup(w, l)))
-                        return -ENOMEM;
+                        return log_oom();
 
                 r = safe_atou(t, &cpu);
                 free(t);
 
                 if (!c)
                         if (!(c = cpu_set_malloc(&ncpus)))
-                                return -ENOMEM;
+                                return log_oom();
 
                 if (r < 0 || cpu >= ncpus) {
                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
@@ -568,7 +568,7 @@ static int config_parse_join_controllers(
 
                 s = strndup(w, length);
                 if (!s)
-                        return -ENOMEM;
+                        return log_oom();
 
                 l = strv_split(s, ",");
                 free(s);
@@ -584,7 +584,7 @@ static int config_parse_join_controllers(
                         arg_join_controllers = new(char**, 2);
                         if (!arg_join_controllers) {
                                 strv_free(l);
-                                return -ENOMEM;
+                                return log_oom();
                         }
 
                         arg_join_controllers[0] = l;
@@ -598,7 +598,7 @@ static int config_parse_join_controllers(
                         t = new0(char**, n+2);
                         if (!t) {
                                 strv_free(l);
-                                return -ENOMEM;
+                                return log_oom();
                         }
 
                         n = 0;
@@ -612,7 +612,7 @@ static int config_parse_join_controllers(
                                         if (!c) {
                                                 strv_free(l);
                                                 strv_free_free(t);
-                                                return -ENOMEM;
+                                                return log_oom();
                                         }
 
                                         strv_free(l);
@@ -624,7 +624,7 @@ static int config_parse_join_controllers(
                                         if (!c) {
                                                 strv_free(l);
                                                 strv_free_free(t);
-                                                return -ENOMEM;
+                                                return log_oom();
                                         }
 
                                         t[n++] = c;
@@ -729,8 +729,10 @@ static int parse_proc_cmdline(void) {
                 r = parse_proc_cmdline_word(word);
                 free(word);
 
-                if (r < 0)
+                if (r < 0) {
+                        log_error("Failed on cmdline argument %s: %s", word, strerror(-r));
                         goto finish;
+                }
         }
 
         r = 0;
@@ -1017,8 +1019,10 @@ static int parse_argv(int argc, char *argv[]) {
                  * instead. */
 
                 for (a = argv; a < argv + argc; a++)
-                        if ((r = parse_proc_cmdline_word(*a)) < 0)
+                        if ((r = parse_proc_cmdline_word(*a)) < 0) {
+                                log_error("Failed on cmdline argument %s: %s", *a, strerror(-r));
                                 return r;
+                        }
         }
 
         return 0;
@@ -1293,8 +1297,10 @@ int main(int argc, char *argv[]) {
         }
 
         /* Initialize default unit */
-        if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
+        if (r == set_default_unit(SPECIAL_DEFAULT_TARGET) < 0) {
+                log_error("Failed to set default unit %s: %s", SPECIAL_DEFAULT_TARGET, strerror(-r));
                 goto finish;
+        }
 
         /* By default, mount "cpu" and "cpuacct" together */
         arg_join_controllers = new(char**, 2);
diff --git a/src/core/mount-setup.c b/src/core/mount-setup.c
index 07794df049..c10c6dad1c 100644
--- a/src/core/mount-setup.c
+++ b/src/core/mount-setup.c
@@ -190,8 +190,7 @@ int mount_cgroup_controllers(char ***join_controllers) {
 
         controllers = set_new(string_hash_func, string_compare_func);
         if (!controllers) {
-                r = -ENOMEM;
-                log_error("Failed to allocate controller set.");
+                r = log_oom();
                 goto finish;
         }
 
@@ -262,9 +261,8 @@ int mount_cgroup_controllers(char ***join_controllers) {
 
                         options = strv_join(*k, ",");
                         if (!options) {
-                                log_error("Failed to join options");
                                 free(controller);
-                                r = -ENOMEM;
+                                r = log_oom();
                                 goto finish;
                         }
 
@@ -275,9 +273,8 @@ int mount_cgroup_controllers(char ***join_controllers) {
 
                 where = strappend("/sys/fs/cgroup/", options);
                 if (!where) {
-                        log_error("Failed to build path");
                         free(options);
-                        r = -ENOMEM;
+                        r = log_oom();
                         goto finish;
                 }
 
@@ -306,8 +303,7 @@ int mount_cgroup_controllers(char ***join_controllers) {
 
                                 t = strappend("/sys/fs/cgroup/", *i);
                                 if (!t) {
-                                        log_error("Failed to build path");
-                                        r = -ENOMEM;
+                                        r = log_oom();
                                         free(options);
                                         goto finish;
                                 }