defs: rework CONF_DIRS_NULSTR() macro

The macro is generically useful for putting together search paths, hence
let's make it truly generic, by dropping the implicit ".d" appending it
does, and leave that to the caller. Also rename it from
CONF_DIRS_NULSTR() to CONF_PATHS_NULSTR(), since it's not strictly about
dirs that way, but any kind of file system path.

Also, mark CONF_DIR_SPLIT_USR() as internal macro by renaming it to
_CONF_PATHS_SPLIT_USR() so that the leading underscore indicates that
it's internal.

16 files changed, 41 insertions, 35 deletions

diff --git a/src/basic/def.h b/src/basic/def.h
index 950f693899..0657ac7367 100644
--- a/src/basic/def.h
+++ b/src/basic/def.h
@@ -76,17 +76,19 @@
 #define NOTIFY_FD_MAX 768
 #define NOTIFY_BUFFER_MAX PIPE_BUF
 
-/* Return a nulstr for a standard cascade of configuration directories,
- * suitable to pass to conf_files_list_nulstr or config_parse_many. */
-#define CONF_DIRS_NULSTR(n) \
-        "/etc/" n ".d\0" \
-        "/run/" n ".d\0" \
-        "/usr/local/lib/" n ".d\0" \
-        "/usr/lib/" n ".d\0" \
-        CONF_DIR_SPLIT_USR(n)
-
 #ifdef HAVE_SPLIT_USR
-#define CONF_DIR_SPLIT_USR(n) "/lib/" n ".d\0"
+#define _CONF_PATHS_SPLIT_USR(n) "/lib/" n "\0"
 #else
-#define CONF_DIR_SPLIT_USR(n)
+#define _CONF_PATHS_SPLIT_USR(n)
 #endif
+
+/* Return a nulstr for a standard cascade of configuration paths,
+ * suitable to pass to conf_files_list_nulstr() or config_parse_many()
+ * to implement drop-in directories for extending configuration
+ * files. */
+#define CONF_PATHS_NULSTR(n) \
+        "/etc/" n "\0" \
+        "/run/" n "\0" \
+        "/usr/local/lib/" n "\0" \
+        "/usr/lib/" n "\0" \
+        _CONF_PATHS_SPLIT_USR(n)
diff --git a/src/binfmt/binfmt.c b/src/binfmt/binfmt.c
index 42ad0adb02..03fb413fe5 100644
--- a/src/binfmt/binfmt.c
+++ b/src/binfmt/binfmt.c
@@ -37,7 +37,7 @@
 #include "strv.h"
 #include "util.h"
 
-static const char conf_file_dirs[] = CONF_DIRS_NULSTR("binfmt");
+static const char conf_file_dirs[] = CONF_PATHS_NULSTR("binfmt.d");
 
 static int delete_rule(const char *rule) {
         _cleanup_free_ char *x = NULL, *fn = NULL;
diff --git a/src/bootchart/bootchart.c b/src/bootchart/bootchart.c
index 852febb225..6a0e1d6b14 100644
--- a/src/bootchart/bootchart.c
+++ b/src/bootchart/bootchart.c
@@ -95,8 +95,6 @@ static void signal_handler(int sig) {
         exiting = 1;
 }
 
-#define BOOTCHART_CONF "/etc/systemd/bootchart.conf"
-
 #define BOOTCHART_MAX (16*1024*1024)
 
 static void parse_conf(void) {
@@ -117,8 +115,8 @@ static void parse_conf(void) {
                 { NULL, NULL, NULL, 0, NULL }
         };
 
-        config_parse_many(BOOTCHART_CONF,
-                          CONF_DIRS_NULSTR("systemd/bootchart.conf"),
+        config_parse_many(PKGSYSCONFDIR "/bootchart.conf",
+                          CONF_PATHS_NULSTR("systemd/bootchart.conf.d"),
                           NULL, config_item_table_lookup, items, true, NULL);
 
         if (init != NULL)
diff --git a/src/core/main.c b/src/core/main.c
index 950315e857..a86080642d 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -682,8 +682,14 @@ static int parse_config_file(void) {
 
         const char *fn, *conf_dirs_nulstr;
 
-        fn = arg_running_as == MANAGER_SYSTEM ? PKGSYSCONFDIR "/system.conf" : PKGSYSCONFDIR "/user.conf";
-        conf_dirs_nulstr = arg_running_as == MANAGER_SYSTEM ? CONF_DIRS_NULSTR("systemd/system.conf") : CONF_DIRS_NULSTR("systemd/user.conf");
+        fn = arg_running_as == MANAGER_SYSTEM ?
+                PKGSYSCONFDIR "/system.conf" :
+                PKGSYSCONFDIR "/user.conf";
+
+        conf_dirs_nulstr = arg_running_as == MANAGER_SYSTEM ?
+                CONF_PATHS_NULSTR("systemd/system.conf.d") :
+                CONF_PATHS_NULSTR("systemd/user.conf.d");
+
         config_parse_many(fn, conf_dirs_nulstr, "Manager\0",
                           config_item_table_lookup, items, false, NULL);
 
diff --git a/src/journal-remote/journal-remote.c b/src/journal-remote/journal-remote.c
index 6eb0ee9d9e..b2f5fbf6b4 100644
--- a/src/journal-remote/journal-remote.c
+++ b/src/journal-remote/journal-remote.c
@@ -1188,7 +1188,7 @@ static int parse_config(void) {
                 {}};
 
         return config_parse_many(PKGSYSCONFDIR "/journal-remote.conf",
-                                 CONF_DIRS_NULSTR("systemd/journal-remote.conf"),
+                                 CONF_PATHS_NULSTR("systemd/journal-remote.conf.d"),
                                  "Remote\0", config_item_table_lookup, items,
                                  false, NULL);
 }
diff --git a/src/journal-remote/journal-upload.c b/src/journal-remote/journal-upload.c
index 42d14dc7c4..6302266ccb 100644
--- a/src/journal-remote/journal-upload.c
+++ b/src/journal-remote/journal-upload.c
@@ -542,7 +542,7 @@ static int parse_config(void) {
                 {}};
 
         return config_parse_many(PKGSYSCONFDIR "/journal-upload.conf",
-                                 CONF_DIRS_NULSTR("systemd/journal-upload.conf"),
+                                 CONF_PATHS_NULSTR("systemd/journal-upload.conf.d"),
                                  "Upload\0", config_item_table_lookup, items,
                                  false, NULL);
 }
diff --git a/src/journal/coredump.c b/src/journal/coredump.c
index 4c83e311db..f750ddfcbd 100644
--- a/src/journal/coredump.c
+++ b/src/journal/coredump.c
@@ -126,8 +126,8 @@ static int parse_config(void) {
                 {}
         };
 
-        return config_parse_many("/etc/systemd/coredump.conf",
-                                 CONF_DIRS_NULSTR("systemd/coredump.conf"),
+        return config_parse_many(PKGSYSCONFDIR "/coredump.conf",
+                                 CONF_PATHS_NULSTR("systemd/coredump.conf.d"),
                                  "Coredump\0",
                                  config_item_table_lookup, items,
                                  false, NULL);
diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
index 7a70dcbc57..f0d3a26372 100644
--- a/src/journal/journald-server.c
+++ b/src/journal/journald-server.c
@@ -1360,8 +1360,8 @@ static int server_parse_proc_cmdline(Server *s) {
 static int server_parse_config_file(Server *s) {
         assert(s);
 
-        return config_parse_many("/etc/systemd/journald.conf",
-                                 CONF_DIRS_NULSTR("systemd/journald.conf"),
+        return config_parse_many(PKGSYSCONFDIR "/journald.conf",
+                                 CONF_PATHS_NULSTR("systemd/journald.conf.d"),
                                  "Journal\0",
                                  config_item_perf_lookup, journald_gperf_lookup,
                                  false, s);
diff --git a/src/login/logind.c b/src/login/logind.c
index 83896ea627..be6bbe5b5c 100644
--- a/src/login/logind.c
+++ b/src/login/logind.c
@@ -1102,8 +1102,8 @@ static int manager_run(Manager *m) {
 static int manager_parse_config_file(Manager *m) {
         assert(m);
 
-        return config_parse_many("/etc/systemd/logind.conf",
-                                 CONF_DIRS_NULSTR("systemd/logind.conf"),
+        return config_parse_many(PKGSYSCONFDIR "/logind.conf",
+                                 CONF_PATHS_NULSTR("systemd/logind.conf.d"),
                                  "Login\0",
                                  config_item_perf_lookup, logind_gperf_lookup,
                                  false, m);
diff --git a/src/modules-load/modules-load.c b/src/modules-load/modules-load.c
index 13784763f1..a7fdcb09cf 100644
--- a/src/modules-load/modules-load.c
+++ b/src/modules-load/modules-load.c
@@ -38,7 +38,7 @@
 
 static char **arg_proc_cmdline_modules = NULL;
 
-static const char conf_file_dirs[] = CONF_DIRS_NULSTR("modules-load");
+static const char conf_file_dirs[] = CONF_PATHS_NULSTR("modules-load.d");
 
 static void systemd_kmod_log(void *data, int priority, const char *file, int line,
                              const char *fn, const char *format, va_list args) {
diff --git a/src/resolve/resolved-conf.c b/src/resolve/resolved-conf.c
index de1bd26174..9207719551 100644
--- a/src/resolve/resolved-conf.c
+++ b/src/resolve/resolved-conf.c
@@ -150,8 +150,8 @@ int config_parse_support(
 int manager_parse_config_file(Manager *m) {
         assert(m);
 
-        return config_parse_many("/etc/systemd/resolved.conf",
-                                 CONF_DIRS_NULSTR("systemd/resolved.conf"),
+        return config_parse_many(PKGSYSCONFDIR "/resolved.conf",
+                                 CONF_PATHS_NULSTR("systemd/resolved.conf.d"),
                                  "Resolve\0",
                                  config_item_perf_lookup, resolved_gperf_lookup,
                                  false, m);
diff --git a/src/shared/sleep-config.c b/src/shared/sleep-config.c
index 102c5cc992..39b836d053 100644
--- a/src/shared/sleep-config.c
+++ b/src/shared/sleep-config.c
@@ -54,7 +54,7 @@ int parse_sleep_config(const char *verb, char ***_modes, char ***_states) {
         };
 
         config_parse_many(PKGSYSCONFDIR "/sleep.conf",
-                          CONF_DIRS_NULSTR("systemd/sleep.conf"),
+                          CONF_PATHS_NULSTR("systemd/sleep.conf.d"),
                           "Sleep\0", config_item_table_lookup, items,
                           false, NULL);
 
diff --git a/src/sysctl/sysctl.c b/src/sysctl/sysctl.c
index 152c98b348..25b5ff52ea 100644
--- a/src/sysctl/sysctl.c
+++ b/src/sysctl/sysctl.c
@@ -41,7 +41,7 @@
 
 static char **arg_prefixes = NULL;
 
-static const char conf_file_dirs[] = CONF_DIRS_NULSTR("sysctl");
+static const char conf_file_dirs[] = CONF_PATHS_NULSTR("sysctl.d");
 
 static int apply_all(Hashmap *sysctl_options) {
         char *property, *value;
diff --git a/src/sysusers/sysusers.c b/src/sysusers/sysusers.c
index 008b1bde24..675f94906b 100644
--- a/src/sysusers/sysusers.c
+++ b/src/sysusers/sysusers.c
@@ -72,7 +72,7 @@ typedef struct Item {
 
 static char *arg_root = NULL;
 
-static const char conf_file_dirs[] = CONF_DIRS_NULSTR("sysusers");
+static const char conf_file_dirs[] = CONF_PATHS_NULSTR("sysusers.d");
 
 static Hashmap *users = NULL, *groups = NULL;
 static Hashmap *todo_uids = NULL, *todo_gids = NULL;
diff --git a/src/timesync/timesyncd-conf.c b/src/timesync/timesyncd-conf.c
index 001a0f4d41..5881bc0c45 100644
--- a/src/timesync/timesyncd-conf.c
+++ b/src/timesync/timesyncd-conf.c
@@ -100,8 +100,8 @@ int config_parse_servers(
 int manager_parse_config_file(Manager *m) {
         assert(m);
 
-        return config_parse_many("/etc/systemd/timesyncd.conf",
-                                 CONF_DIRS_NULSTR("systemd/timesyncd.conf"),
+        return config_parse_many(PKGSYSCONFDIR "/timesyncd.conf",
+                                 CONF_PATHS_NULSTR("systemd/timesyncd.conf.d"),
                                  "Time\0",
                                  config_item_perf_lookup, timesyncd_gperf_lookup,
                                  false, m);
diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c
index ffae91a3ca..64f0c9396c 100644
--- a/src/tmpfiles/tmpfiles.c
+++ b/src/tmpfiles/tmpfiles.c
@@ -159,7 +159,7 @@ static char **arg_include_prefixes = NULL;
 static char **arg_exclude_prefixes = NULL;
 static char *arg_root = NULL;
 
-static const char conf_file_dirs[] = CONF_DIRS_NULSTR("tmpfiles");
+static const char conf_file_dirs[] = CONF_PATHS_NULSTR("tmpfiles.d");
 
 #define MAX_DEPTH 256