Report about syntax errors with metadata

The information about the unit for which files are being parsed
is passed all the way down. This way messages land in the journal
with proper UNIT=... or USER_UNIT=... attribution.

'systemctl status' and 'journalctl -u' not displaying those messages
has been a source of confusion for users, since the journal entry for
a misspelt setting was often logged quite a bit earlier than the
failure to start a unit.

Based-on-a-patch-by: Oleksii Shevchuk <alxchk@gmail.com>

3 files changed, 337 insertions, 259 deletions

diff --git a/src/shared/conf-parser.c b/src/shared/conf-parser.c
index a98805e215..7a986623fb 100644
--- a/src/shared/conf-parser.c
+++ b/src/shared/conf-parser.c
@@ -34,6 +34,45 @@
 #include "path-util.h"
 #include "set.h"
 #include "exit-status.h"
+#include "sd-messages.h"
+
+int log_syntax_internal(const char *unit, int level,
+                        const char *file, unsigned line, const char *func,
+                        const char *config_file, unsigned config_line,
+                        int error, const char *format, ...) {
+
+        _cleanup_free_ char *msg = NULL;
+        int r;
+        va_list ap;
+
+        va_start(ap, format);
+        r = vasprintf(&msg, format, ap);
+        va_end(ap);
+        if (r < 0)
+                return log_oom();
+
+        if (unit)
+                r = log_struct_internal(level,
+                                        file, line, func,
+                                        getpid() == 1 ? "UNIT=%s" : "USER_UNIT=%s", unit,
+                                        MESSAGE_ID(SD_MESSAGE_CONFIG_ERROR),
+                                        "CONFIG_FILE=%s", config_file,
+                                        "CONFIG_LINE=%u", config_line,
+                                        "ERRNO=%d", error > 0 ? error : EINVAL,
+                                        "MESSAGE=[%s:%u] %s", config_file, config_line, msg,
+                                        NULL);
+        else
+                r = log_struct_internal(level,
+                                        file, line, func,
+                                        MESSAGE_ID(SD_MESSAGE_CONFIG_ERROR),
+                                        "CONFIG_FILE=%s", config_file,
+                                        "CONFIG_LINE=%u", config_line,
+                                        "ERRNO=%d", error > 0 ? error : EINVAL,
+                                        "MESSAGE=[%s:%u] %s", config_file, config_line, msg,
+                                        NULL);
+        log_info("logged here: '%s': %d", msg, r);
+        return r;
+}
 
 int config_item_table_lookup(
                 void *table,
@@ -110,16 +149,16 @@ int config_item_perf_lookup(
 }
 
 /* Run the user supplied parser for an assignment */
-static int next_assignment(
-                const char *filename,
-                unsigned line,
-                ConfigItemLookup lookup,
-                void *table,
-                const char *section,
-                const char *lvalue,
-                const char *rvalue,
-                bool relaxed,
-                void *userdata) {
+static int next_assignment(const char *unit,
+                           const char *filename,
+                           unsigned line,
+                           ConfigItemLookup lookup,
+                           void *table,
+                           const char *section,
+                           const char *lvalue,
+                           const char *rvalue,
+                           bool relaxed,
+                           void *userdata) {
 
         ConfigParserCallback func = NULL;
         int ltype = 0;
@@ -138,29 +177,31 @@ static int next_assignment(
 
         if (r > 0) {
                 if (func)
-                        return func(filename, line, section, lvalue, ltype, rvalue, data, userdata);
+                        return func(unit, filename, line, section, lvalue, ltype,
+                                    rvalue, data, userdata);
 
                 return 0;
         }
 
         /* Warn about unknown non-extension fields. */
         if (!relaxed && !startswith(lvalue, "X-"))
-                log_info("[%s:%u] Unknown lvalue '%s' in section '%s'. Ignoring.", filename, line, lvalue, section);
+                log_syntax(unit, LOG_WARNING, filename, line, EINVAL,
+                           "Unknown lvalue '%s' in section '%s'", lvalue, section);
 
         return 0;
 }
 
 /* Parse a variable assignment line */
-static int parse_line(
-                const char *filename,
-                unsigned line,
-                const char *sections,
-                ConfigItemLookup lookup,
-                void *table,
-                bool relaxed,
-                char **section,
-                char *l,
-                void *userdata) {
+static int parse_line(const char* unit,
+                      const char *filename,
+                      unsigned line,
+                      const char *sections,
+                      ConfigItemLookup lookup,
+                      void *table,
+                      bool relaxed,
+                      char **section,
+                      char *l,
+                      void *userdata) {
 
         char *e;
 
@@ -178,17 +219,13 @@ static int parse_line(
                 return 0;
 
         if (startswith(l, ".include ")) {
-                char *fn;
-                int r;
+                char _cleanup_free_ *fn;
 
                 fn = file_in_same_dir(filename, strstrip(l+9));
                 if (!fn)
                         return -ENOMEM;
 
-                r = config_parse(fn, NULL, sections, lookup, table, relaxed, userdata);
-                free(fn);
-
-                return r;
+                return config_parse(unit, fn, NULL, sections, lookup, table, relaxed, userdata);
         }
 
         if (*l == '[') {
@@ -199,7 +236,8 @@ static int parse_line(
                 assert(k > 0);
 
                 if (l[k-1] != ']') {
-                        log_error("[%s:%u] Invalid section header.", filename, line);
+                        log_syntax(unit, LOG_ERR, filename, line, EBADMSG,
+                                   "Invalid section header '%s'", l);
                         return -EBADMSG;
                 }
 
@@ -210,7 +248,8 @@ static int parse_line(
                 if (sections && !nulstr_contains(sections, n)) {
 
                         if (!relaxed)
-                                log_info("[%s:%u] Unknown section '%s'. Ignoring.", filename, line, n);
+                                log_syntax(unit, LOG_WARNING, filename, line, EINVAL,
+                                           "Unknown section '%s'. Ignoring.", n);
 
                         free(n);
                         *section = NULL;
@@ -225,41 +264,42 @@ static int parse_line(
         if (sections && !*section) {
 
                 if (!relaxed)
-                        log_info("[%s:%u] Assignment outside of section. Ignoring.", filename, line);
+                        log_syntax(unit, LOG_WARNING, filename, line, EINVAL,
+                                   "Assignment outside of section. Ignoring.");
 
                 return 0;
         }
 
         e = strchr(l, '=');
         if (!e) {
-                log_error("[%s:%u] Missing '='.", filename, line);
+                log_syntax(unit, LOG_WARNING, filename, line, EINVAL, "Missing '='.");
                 return -EBADMSG;
         }
 
         *e = 0;
         e++;
 
-        return next_assignment(
-                        filename,
-                        line,
-                        lookup,
-                        table,
-                        *section,
-                        strstrip(l),
-                        strstrip(e),
-                        relaxed,
-                        userdata);
+        return next_assignment(unit,
+                               filename,
+                               line,
+                               lookup,
+                               table,
+                               *section,
+                               strstrip(l),
+                               strstrip(e),
+                               relaxed,
+                               userdata);
 }
 
 /* Go through the file and parse each line */
-int config_parse(
-                const char *filename,
-                FILE *f,
-                const char *sections,
-                ConfigItemLookup lookup,
-                void *table,
-                bool relaxed,
-                void *userdata) {
+int config_parse(const char *unit,
+                 const char *filename,
+                 FILE *f,
+                 const char *sections,
+                 ConfigItemLookup lookup,
+                 void *table,
+                 bool relaxed,
+                 void *userdata) {
 
         unsigned line = 0;
         char _cleanup_free_ *section = NULL, *continuation = NULL;
@@ -323,15 +363,16 @@ int config_parse(
                         continue;
                 }
 
-                r = parse_line(filename,
-                                ++line,
-                                sections,
-                                lookup,
-                                table,
-                                relaxed,
-                                &section,
-                                p,
-                                userdata);
+                r = parse_line(unit,
+                               filename,
+                               ++line,
+                               sections,
+                               lookup,
+                               table,
+                               relaxed,
+                               &section,
+                               p,
+                               userdata);
                 free(c);
 
                 if (r < 0)
@@ -342,7 +383,8 @@ int config_parse(
 }
 
 #define DEFINE_PARSER(type, vartype, conv_func)                         \
-        int config_parse_##type(const char *filename,                   \
+        int config_parse_##type(const char *unit,                       \
+                                const char *filename,                   \
                                 unsigned line,                          \
                                 const char *section,                    \
                                 const char *lvalue,                     \
@@ -361,8 +403,9 @@ int config_parse(
                                                                         \
                 r = conv_func(rvalue, i);                               \
                 if (r < 0)                                              \
-                        log_error("[%s:%u] Failed to parse %s value, ignoring: %s", \
-                                  filename, line, #vartype, rvalue);    \
+                        log_syntax(unit, LOG_ERR, filename, line, -r,   \
+                                   "Failed to parse %s value, ignoring: %s", \
+                                   #vartype, rvalue);                   \
                                                                         \
                 return 0;                                               \
         }
@@ -376,26 +419,29 @@ DEFINE_PARSER(nsec, nsec_t, parse_nsec)
 DEFINE_PARSER(sec, usec_t, parse_sec)
 
 
-int config_parse_bytes_size(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_bytes_size(const char* unit,
+                            const char *filename,
+                            unsigned line,
+                            const char *section,
+                            const char *lvalue,
+                            int ltype,
+                            const char *rvalue,
+                            void *data,
+                            void *userdata) {
 
         size_t *sz = data;
         off_t o;
+        int r;
 
         assert(filename);
         assert(lvalue);
         assert(rvalue);
         assert(data);
 
-        if (parse_bytes(rvalue, &o) < 0 || (off_t) (size_t) o != o) {
-                log_error("[%s:%u] Failed to parse byte value, ignoring: %s", filename, line, rvalue);
+        r = parse_bytes(rvalue, &o);
+        if (r < 0 || (off_t) (size_t) o != o) {
+                log_syntax(unit, LOG_ERR, filename, line, -r,
+                           "Failed to parse byte value, ignoring: %s", rvalue);
                 return 0;
         }
 
@@ -404,17 +450,18 @@ int config_parse_bytes_size(
 }
 
 
-int config_parse_bytes_off(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_bytes_off(const char* unit,
+                           const char *filename,
+                           unsigned line,
+                           const char *section,
+                           const char *lvalue,
+                           int ltype,
+                           const char *rvalue,
+                           void *data,
+                           void *userdata) {
 
         off_t *bytes = data;
+        int r;
 
         assert(filename);
         assert(lvalue);
@@ -423,23 +470,23 @@ int config_parse_bytes_off(
 
         assert_cc(sizeof(off_t) == sizeof(uint64_t));
 
-        if (parse_bytes(rvalue, bytes) < 0) {
-                log_error("[%s:%u] Failed to parse bytes value, ignoring: %s", filename, line, rvalue);
-                return 0;
-        }
+        r = parse_bytes(rvalue, bytes);
+        if (r < 0)
+                log_syntax(unit, LOG_ERR, filename, line, -r,
+                           "Failed to parse bytes value, ignoring: %s", rvalue);
 
         return 0;
 }
 
-int config_parse_bool(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_bool(const char* unit,
+                      const char *filename,
+                      unsigned line,
+                      const char *section,
+                      const char *lvalue,
+                      int ltype,
+                      const char *rvalue,
+                      void *data,
+                      void *userdata) {
 
         int k;
         bool *b = data;
@@ -449,8 +496,10 @@ int config_parse_bool(
         assert(rvalue);
         assert(data);
 
-        if ((k = parse_boolean(rvalue)) < 0) {
-                log_error("[%s:%u] Failed to parse boolean value, ignoring: %s", filename, line, rvalue);
+        k = parse_boolean(rvalue);
+        if (k < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, -k,
+                           "Failed to parse boolean value, ignoring: %s", rvalue);
                 return 0;
         }
 
@@ -458,15 +507,15 @@ int config_parse_bool(
         return 0;
 }
 
-int config_parse_tristate(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_tristate(const char *unit,
+                          const char *filename,
+                          unsigned line,
+                          const char *section,
+                          const char *lvalue,
+                          int ltype,
+                          const char *rvalue,
+                          void *data,
+                          void *userdata) {
 
         int k;
         int *b = data;
@@ -480,7 +529,8 @@ int config_parse_tristate(
 
         k = parse_boolean(rvalue);
         if (k < 0) {
-                log_error("[%s:%u] Failed to parse boolean value, ignoring: %s", filename, line, rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, -k,
+                           "Failed to parse boolean value, ignoring: %s", rvalue);
                 return 0;
         }
 
@@ -488,15 +538,15 @@ int config_parse_tristate(
         return 0;
 }
 
-int config_parse_string(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_string(const char *unit,
+                        const char *filename,
+                        unsigned line,
+                        const char *section,
+                        const char *lvalue,
+                        int ltype,
+                        const char *rvalue,
+                        void *data,
+                        void *userdata) {
 
         char **s = data;
         char *n;
@@ -511,7 +561,8 @@ int config_parse_string(
                 return log_oom();
 
         if (!utf8_is_valid(n)) {
-                log_error("[%s:%u] String is not UTF-8 clean, ignoring assignment: %s", filename, line, rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                           "String is not UTF-8 clean, ignoring assignment: %s", rvalue);
                 free(n);
                 return 0;
         }
@@ -527,15 +578,15 @@ int config_parse_string(
         return 0;
 }
 
-int config_parse_path(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_path(const char *unit,
+                      const char *filename,
+                      unsigned line,
+                      const char *section,
+                      const char *lvalue,
+                      int ltype,
+                      const char *rvalue,
+                      void *data,
+                      void *userdata) {
 
         char **s = data;
         char *n;
@@ -546,12 +597,14 @@ int config_parse_path(
         assert(data);
 
         if (!utf8_is_valid(rvalue)) {
-                log_error("[%s:%u] Path is not UTF-8 clean, ignoring assignment: %s", filename, line, rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                           "Path is not UTF-8 clean, ignoring assignment: %s", rvalue);
                 return 0;
         }
 
         if (!path_is_absolute(rvalue)) {
-                log_error("[%s:%u] Not an absolute path, ignoring: %s", filename, line, rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                           "Not an absolute path, ignoring: %s", rvalue);
                 return 0;
         }
 
@@ -567,15 +620,15 @@ int config_parse_path(
         return 0;
 }
 
-int config_parse_strv(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_strv(const char *unit,
+                      const char *filename,
+                      unsigned line,
+                      const char *section,
+                      const char *lvalue,
+                      int ltype,
+                      const char *rvalue,
+                      void *data,
+                      void *userdata) {
 
         char *** sv = data, *w, *state;
         size_t l;
@@ -610,7 +663,8 @@ int config_parse_strv(
                         return log_oom();
 
                 if (!utf8_is_valid(n)) {
-                        log_error("[%s:%u] String is not UTF-8 clean, ignoring: %s", filename, line, rvalue);
+                        log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                                   "String is not UTF-8 clean, ignoring: %s", rvalue);
                         continue;
                 }
 
@@ -622,15 +676,15 @@ int config_parse_strv(
         return 0;
 }
 
-int config_parse_path_strv(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_path_strv(const char *unit,
+                           const char *filename,
+                           unsigned line,
+                           const char *section,
+                           const char *lvalue,
+                           int ltype,
+                           const char *rvalue,
+                           void *data,
+                           void *userdata) {
 
         char*** sv = data, *w, *state;
         size_t l;
@@ -656,12 +710,14 @@ int config_parse_path_strv(
                         return log_oom();
 
                 if (!utf8_is_valid(n)) {
-                        log_error("[%s:%u] Path is not UTF-8 clean, ignoring assignment: %s", filename, line, rvalue);
+                        log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                                   "Path is not UTF-8 clean, ignoring assignment: %s", rvalue);
                         continue;
                 }
 
                 if (!path_is_absolute(n)) {
-                        log_error("[%s:%u] Not an absolute path, ignoring: %s", filename, line, rvalue);
+                        log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                                   "Not an absolute path, ignoring: %s", rvalue);
                         continue;
                 }
 
@@ -674,15 +730,15 @@ int config_parse_path_strv(
         return 0;
 }
 
-int config_parse_mode(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_mode(const char *unit,
+                      const char *filename,
+                      unsigned line,
+                      const char *section,
+                      const char *lvalue,
+                      int ltype,
+                      const char *rvalue,
+                      void *data,
+                      void *userdata) {
 
         mode_t *m = data;
         long l;
@@ -696,12 +752,14 @@ int config_parse_mode(
         errno = 0;
         l = strtol(rvalue, &x, 8);
         if (!x || x == rvalue || *x || errno) {
-                log_error("[%s:%u] Failed to parse mode value, ignoring: %s", filename, line, rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, errno,
+                           "Failed to parse mode value, ignoring: %s", rvalue);
                 return 0;
         }
 
         if (l < 0000 || l > 07777) {
-                log_error("[%s:%u] mode value out of range, ignoring: %s", filename, line, rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, ERANGE,
+                           "Mode value out of range, ignoring: %s", rvalue);
                 return 0;
         }
 
@@ -709,15 +767,15 @@ int config_parse_mode(
         return 0;
 }
 
-int config_parse_facility(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_facility(const char *unit,
+                          const char *filename,
+                          unsigned line,
+                          const char *section,
+                          const char *lvalue,
+                          int ltype,
+                          const char *rvalue,
+                          void *data,
+                          void *userdata) {
 
 
         int *o = data, x;
@@ -729,7 +787,8 @@ int config_parse_facility(
 
         x = log_facility_unshifted_from_string(rvalue);
         if (x < 0) {
-                log_error("[%s:%u] Failed to parse log facility, ignoring: %s", filename, line, rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                           "Failed to parse log facility, ignoring: %s", rvalue);
                 return 0;
         }
 
@@ -738,15 +797,15 @@ int config_parse_facility(
         return 0;
 }
 
-int config_parse_level(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_level(const char *unit,
+                       const char *filename,
+                       unsigned line,
+                       const char *section,
+                       const char *lvalue,
+                       int ltype,
+                       const char *rvalue,
+                       void *data,
+                       void *userdata) {
 
 
         int *o = data, x;
@@ -758,7 +817,8 @@ int config_parse_level(
 
         x = log_level_from_string(rvalue);
         if (x < 0) {
-                log_error("[%s:%u] Failed to parse log level, ignoring: %s", filename, line, rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                           "Failed to parse log level, ignoring: %s", rvalue);
                 return 0;
         }
 
@@ -766,15 +826,15 @@ int config_parse_level(
         return 0;
 }
 
-int config_parse_set_status(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+int config_parse_set_status(const char *unit,
+                            const char *filename,
+                            unsigned line,
+                            const char *section,
+                            const char *lvalue,
+                            int ltype,
+                            const char *rvalue,
+                            void *data,
+                            void *userdata) {
 
         char *w;
         size_t l;
@@ -817,18 +877,21 @@ int config_parse_set_status(
 
                                 r = set_put(status_set->signal, INT_TO_PTR(val));
                                 if (r < 0) {
-                                        log_error("[%s:%u] Unable to store: %s", filename, line, w);
+                                        log_syntax(unit, LOG_ERR, filename, line, -r,
+                                                   "Unable to store: %s", w);
                                         return r;
                                 }
                         } else {
-                                log_error("[%s:%u] Failed to parse value, ignoring: %s", filename, line, w);
+                                log_syntax(unit, LOG_ERR, filename, line, -val,
+                                           "Failed to parse value, ignoring: %s", w);
                                 return 0;
                         }
                 } else {
                         free(temp);
 
                         if (val < 0 || val > 255)
-                                log_warning("[%s:%u] Value %d is outside range 0-255, ignoring", filename, line, val);
+                                log_syntax(unit, LOG_ERR, filename, line, ERANGE,
+                                           "Value %d is outside range 0-255, ignoring", val);
                         else {
                                 r = set_ensure_allocated(&status_set->code, trivial_hash_func, trivial_compare_func);
                                 if (r < 0)
@@ -836,7 +899,8 @@ int config_parse_set_status(
 
                                 r = set_put(status_set->code, INT_TO_PTR(val));
                                 if (r < 0) {
-                                        log_error("[%s:%u] Unable to store: %s", filename, line, w);
+                                        log_syntax(unit, LOG_ERR, filename, line, -r,
+                                                   "Unable to store: %s", w);
                                         return r;
                                 }
                         }
diff --git a/src/shared/conf-parser.h b/src/shared/conf-parser.h
index 88194f6771..9ea84e652b 100644
--- a/src/shared/conf-parser.h
+++ b/src/shared/conf-parser.h
@@ -24,19 +24,21 @@
 #include <stdio.h>
 #include <stdbool.h>
 
+#include "macro.h"
+
 /* An abstract parser for simple, line based, shallow configuration
  * files consisting of variable assignments only. */
 
 /* Prototype for a parser for a specific configuration setting */
-typedef int (*ConfigParserCallback)(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata);
+typedef int (*ConfigParserCallback)(const char *unit,
+                                    const char *filename,
+                                    unsigned line,
+                                    const char *section,
+                                    const char *lvalue,
+                                    int ltype,
+                                    const char *rvalue,
+                                    void *data,
+                                    void *userdata);
 
 /* Wraps information for parsing a specific configuration variable, to
  * be stored in a simple array */
@@ -78,46 +80,57 @@ int config_item_table_lookup(void *table, const char *section, const char *lvalu
  * ConfigPerfItem tables */
 int config_item_perf_lookup(void *table, const char *section, const char *lvalue, ConfigParserCallback *func, int *ltype, void **data, void *userdata);
 
-int config_parse(
-                const char *filename,
-                FILE *f,
-                const char *sections,  /* nulstr */
-                ConfigItemLookup lookup,
-                void *table,
-                bool relaxed,
-                void *userdata);
+int config_parse(const char *unit,
+                 const char *filename,
+                 FILE *f,
+                 const char *sections,  /* nulstr */
+                 ConfigItemLookup lookup,
+                 void *table,
+                 bool relaxed,
+                 void *userdata);
 
 /* Generic parsers */
-int config_parse_int(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_unsigned(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_long(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_uint64(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_double(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_bytes_size(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_bytes_off(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_bool(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_tristate(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_string(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_path(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_strv(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_path_strv(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_sec(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_nsec(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_mode(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_facility(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_level(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
-int config_parse_set_status(const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_int(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_unsigned(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_long(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_uint64(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_double(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_bytes_size(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_bytes_off(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_bool(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_tristate(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_string(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_path(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_strv(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_path_strv(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_sec(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_nsec(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_mode(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_facility(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_level(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_set_status(const char *unit, const char *filename, unsigned line, const char *section, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+
+int log_syntax_internal(const char *unit, int level,
+                        const char *file, unsigned line, const char *func,
+                        const char *config_file, unsigned config_line,
+                        int error, const char *format, ...) _printf_attr_(9, 10);
+
+#define log_syntax(unit, level, config_file, config_line, error, ...)   \
+        log_syntax_internal(unit, level,                                \
+                            __FILE__, __LINE__, __func__,               \
+                            config_file, config_line,                   \
+                            error, __VA_ARGS__)
 
 #define DEFINE_CONFIG_PARSE_ENUM(function,name,type,msg)                \
-        int function(                                                   \
-                        const char *filename,                           \
-                        unsigned line,                                  \
-                        const char *section,                            \
-                        const char *lvalue,                             \
-                        int ltype,                                      \
-                        const char *rvalue,                             \
-                        void *data,                                     \
-                        void *userdata) {                               \
+        int function(const char *unit,                                  \
+                     const char *filename,                              \
+                     unsigned line,                                     \
+                     const char *section,                               \
+                     const char *lvalue,                                \
+                     int ltype,                                         \
+                     const char *rvalue,                                \
+                     void *data,                                        \
+                     void *userdata) {                                  \
                                                                         \
                 type *i = data, x;                                      \
                                                                         \
@@ -127,11 +140,11 @@ int config_parse_set_status(const char *filename, unsigned line, const char *sec
                 assert(data);                                           \
                                                                         \
                 if ((x = name##_from_string(rvalue)) < 0) {             \
-                        log_error("[%s:%u] " msg ", ignoring: %s", filename, line, rvalue); \
+                        log_syntax(unit, LOG_ERR, filename, line, -x,   \
+                                   msg ", ignoring: %s", rvalue);       \
                         return 0;                                       \
                 }                                                       \
                                                                         \
                 *i = x;                                                 \
-                                                                        \
                 return 0;                                               \
         }
diff --git a/src/shared/install.c b/src/shared/install.c
index 71e04335ef..75d6ca3619 100644
--- a/src/shared/install.c
+++ b/src/shared/install.c
@@ -921,15 +921,15 @@ static int install_info_add_auto(
                 return install_info_add(c, name_or_path, NULL);
 }
 
-static int config_parse_also(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+static int config_parse_also(const char *unit,
+                             const char *filename,
+                             unsigned line,
+                             const char *section,
+                             const char *lvalue,
+                             int ltype,
+                             const char *rvalue,
+                             void *data,
+                             void *userdata) {
 
         char *w;
         size_t l;
@@ -956,15 +956,15 @@ static int config_parse_also(
         return 0;
 }
 
-static int config_parse_user(
-                const char *filename,
-                unsigned line,
-                const char *section,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
+static int config_parse_user(const char *unit,
+                             const char *filename,
+                             unsigned line,
+                             const char *section,
+                             const char *lvalue,
+                             int ltype,
+                             const char *rvalue,
+                             void *data,
+                             void *userdata) {
 
         InstallInfo *i = data;
         char* printed;
@@ -1016,7 +1016,8 @@ static int unit_file_load(
                 return -ENOMEM;
         }
 
-        r = config_parse(path, f, NULL, config_item_table_lookup, (void*) items, true, info);
+        r = config_parse(NULL, path, f, NULL,
+                         config_item_table_lookup, (void*) items, true, info);
         if (r < 0)
                 return r;