Introspect and monitor dropin configuration

[elogind.git] / src / core / load-dropin.c

diff --git a/src/core/load-dropin.c b/src/core/load-dropin.c
index 86f81c7484ea6674c4661f2252130800fe5c0d26..942ad027e9c21c67f986eba9039812cf144a4817 100644 (file)
--- a/src/core/load-dropin.c
+++ b/src/core/load-dropin.c
@@ -27,51 +27,66 @@
 #include "log.h"
 #include "strv.h"
 #include "unit-name.h"
+#include "conf-parser.h"
+#include "load-fragment.h"
+#include "conf-files.h"
 
-static int iterate_dir(Unit *u, const char *path, UnitDependency dependency) {
-        DIR *d;
-        struct dirent *de;
+static int iterate_dir(Unit *u, const char *path, UnitDependency dependency, char ***strv) {
+        _cleanup_closedir_ DIR *d = NULL;
         int r;
 
         assert(u);
         assert(path);
 
+        /* The config directories are special, since the order of the
+         * drop-ins matters */
+        if (dependency < 0)  {
+                r = strv_extend(strv, path);
+                if (r < 0)
+                        return log_oom();
+
+                return 0;
+        }
+
         d = opendir(path);
         if (!d) {
-
                 if (errno == ENOENT)
                         return 0;
 
                 return -errno;
         }
 
-        while ((de = readdir(d))) {
-                char *f;
+        for (;;) {
+                struct dirent *de;
+                union dirent_storage buf;
+                _cleanup_free_ char *f = NULL;
+                int k;
+
+                k = readdir_r(d, &buf.de, &de);
+                if (k != 0) {
+                        log_error("Failed to read directory %s: %s", path, strerror(k));
+                        return -k;
+                }
+
+                if (!de)
+                        break;
 
                 if (ignore_file(de->d_name))
                         continue;
 
                 f = strjoin(path, "/", de->d_name, NULL);
-                if (!f) {
-                        r = -ENOMEM;
-                        goto finish;
-                }
+                if (!f)
+                        return log_oom();
 
                 r = unit_add_dependency_by_name(u, dependency, de->d_name, f, true);
-                free(f);
-
                 if (r < 0)
                         log_error("Cannot add dependency %s to %s, ignoring: %s", de->d_name, u->id, strerror(-r));
         }
 
-        r = 0;
-
-finish:
-        closedir(d);
-        return r;
+        return 0;
 }
 
-static int process_dir(Unit *u, const char *unit_path, const char *name, const char *suffix, UnitDependency dependency) {
+static int process_dir(Unit *u, const char *unit_path, const char *name, const char *suffix, UnitDependency dependency, char ***strv) {
         int r;
         char *path;
 
@@ -88,7 +103,7 @@ static int process_dir(Unit *u, const char *unit_path, const char *name, const c
             !set_get(u->manager->unit_path_cache, path))
                 r = 0;
         else
-                r = iterate_dir(u, path, dependency);
+                r = iterate_dir(u, path, dependency, strv);
         free(path);
 
         if (r < 0)
@@ -112,7 +127,7 @@ static int process_dir(Unit *u, const char *unit_path, const char *name, const c
                     !set_get(u->manager->unit_path_cache, path))
                         r = 0;
                 else
-                        r = iterate_dir(u, path, dependency);
+                        r = iterate_dir(u, path, dependency, strv);
                 free(path);
 
                 if (r < 0)
@@ -122,9 +137,44 @@ static int process_dir(Unit *u, const char *unit_path, const char *name, const c
         return 0;
 }
 
-int unit_load_dropin(Unit *u) {
+char **unit_find_dropin_paths(Unit *u) {
         Iterator i;
         char *t;
+        _cleanup_strv_free_ char **strv = NULL;
+        char **configs = NULL;
+        int r;
+
+        assert(u);
+
+        SET_FOREACH(t, u->names, i) {
+                char **p;
+
+                STRV_FOREACH(p, u->manager->lookup_paths.unit_path) {
+                        /* This loads the drop-in config snippets */
+                        r = process_dir(u, *p, t, ".d", _UNIT_DEPENDENCY_INVALID, &strv);
+                        if (r < 0)
+                                return NULL;
+                }
+        }
+
+        if (!strv_isempty(strv)) {
+                r = conf_files_list_strv(&configs, ".conf", NULL, (const char**) strv);
+                if (r < 0) {
+                        log_error("Failed to get list of configuration files: %s", strerror(-r));
+                        strv_free(configs);
+                        return NULL;
+                }
+
+        }
+
+        return configs;
+}
+
+int unit_load_dropin(Unit *u) {
+        Iterator i;
+        char *t, **f;
+        _cleanup_strv_free_ char **strv = NULL;
+        int r;
 
         assert(u);
 
@@ -134,17 +184,27 @@ int unit_load_dropin(Unit *u) {
                 char **p;
 
                 STRV_FOREACH(p, u->manager->lookup_paths.unit_path) {
-                        int r;
-
-                        r = process_dir(u, *p, t, ".wants", UNIT_WANTS);
+                        r = process_dir(u, *p, t, ".wants", UNIT_WANTS, NULL);
                         if (r < 0)
                                 return r;
 
-                        r = process_dir(u, *p, t, ".requires", UNIT_REQUIRES);
+                        r = process_dir(u, *p, t, ".requires", UNIT_REQUIRES, NULL);
                         if (r < 0)
                                 return r;
                 }
         }
 
+        u->dropin_paths = unit_find_dropin_paths(u);
+        if (! u->dropin_paths)
+                return 0;
+
+        STRV_FOREACH(f, u->dropin_paths) {
+                r = config_parse(*f, NULL, UNIT_VTABLE(u)->sections, config_item_perf_lookup, (void*) load_fragment_gperf_lookup, false, u);
+                if (r < 0)
+                        return r;
+        }
+
+        u->dropin_mtime = now(CLOCK_REALTIME);
+
         return 0;
 }