Merge pull request #4459 from keszybz/commandline-parsing

Commandline parsing simplification and udev fix

16 files changed, 135 insertions, 161 deletions

diff --git a/man/journald.conf.xml b/man/journald.conf.xml
index df2e2246a1..9daa964803 100644
--- a/man/journald.conf.xml
+++ b/man/journald.conf.xml
@@ -301,22 +301,21 @@
         <term><varname>ForwardToConsole=</varname></term>
         <term><varname>ForwardToWall=</varname></term>
 
-        <listitem><para>Control whether log messages received by the
-        journal daemon shall be forwarded to a traditional syslog
-        daemon, to the kernel log buffer (kmsg), to the system
-        console, or sent as wall messages to all logged-in users.
-        These options take boolean arguments. If forwarding to syslog
-        is enabled but nothing reads messages from the socket,
-        forwarding to syslog has no effect. By default, only
-        forwarding to wall is enabled. These settings may be
-        overridden at boot time with the kernel command line options
-        <literal>systemd.journald.forward_to_syslog=</literal>,
-        <literal>systemd.journald.forward_to_kmsg=</literal>,
-        <literal>systemd.journald.forward_to_console=</literal>, and
-        <literal>systemd.journald.forward_to_wall=</literal>. When
-        forwarding to the console, the TTY to log to can be changed
-        with <varname>TTYPath=</varname>, described
-        below.</para></listitem>
+        <listitem><para>Control whether log messages received by the journal daemon shall
+        be forwarded to a traditional syslog daemon, to the kernel log buffer (kmsg), to
+        the system console, or sent as wall messages to all logged-in users.  These
+        options take boolean arguments. If forwarding to syslog is enabled but nothing
+        reads messages from the socket, forwarding to syslog has no effect. By default,
+        only forwarding to wall is enabled. These settings may be overridden at boot time
+        with the kernel command line options
+        <literal>systemd.journald.forward_to_syslog</literal>,
+        <literal>systemd.journald.forward_to_kmsg</literal>,
+        <literal>systemd.journald.forward_to_console</literal>, and
+        <literal>systemd.journald.forward_to_wall</literal>. If the option name is
+        specified without <literal>=</literal> and the following argument, true is
+        assumed. Otherwise, the argument is parsed as a boolean. When forwarding to the
+        console, the TTY to log to can be changed with <varname>TTYPath=</varname>,
+        described below.</para></listitem>
       </varlistentry>
 
       <varlistentry>
diff --git a/src/basic/log.c b/src/basic/log.c
index bd6c96c4f8..2ff70be255 100644
--- a/src/basic/log.c
+++ b/src/basic/log.c
@@ -967,7 +967,7 @@ int log_set_max_level_from_string(const char *e) {
         return 0;
 }
 
-static int parse_proc_cmdline_item(const char *key, const char *value) {
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
 
         /*
          * The systemd.log_xyz= settings are parsed by all tools, and
@@ -1012,7 +1012,7 @@ void log_parse_environment(void) {
                 /* Only try to read the command line in daemons.
                    We assume that anything that has a controlling
                    tty is user stuff. */
-                (void) parse_proc_cmdline(parse_proc_cmdline_item);
+                (void) parse_proc_cmdline(parse_proc_cmdline_item, NULL, true);
 
         e = secure_getenv("SYSTEMD_LOG_TARGET");
         if (e && log_set_target_from_string(e) < 0)
diff --git a/src/basic/proc-cmdline.c b/src/basic/proc-cmdline.c
index 0430beadaa..8297a222b7 100644
--- a/src/basic/proc-cmdline.c
+++ b/src/basic/proc-cmdline.c
@@ -42,7 +42,9 @@ int proc_cmdline(char **ret) {
                 return read_one_line_file("/proc/cmdline", ret);
 }
 
-int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value)) {
+int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value, void *data),
+                       void *data,
+                       bool strip_prefix) {
         _cleanup_free_ char *line = NULL;
         const char *p;
         int r;
@@ -56,7 +58,7 @@ int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value)) {
         p = line;
         for (;;) {
                 _cleanup_free_ char *word = NULL;
-                char *value = NULL;
+                char *value = NULL, *unprefixed;
 
                 r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
                 if (r < 0)
@@ -66,14 +68,15 @@ int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value)) {
 
                 /* Filter out arguments that are intended only for the
                  * initrd */
-                if (!in_initrd() && startswith(word, "rd."))
+                unprefixed = startswith(word, "rd.");
+                if (unprefixed && !in_initrd())
                         continue;
 
                 value = strchr(word, '=');
                 if (value)
                         *(value++) = 0;
 
-                r = parse_item(word, value);
+                r = parse_item(strip_prefix && unprefixed ? unprefixed : word, value, data);
                 if (r < 0)
                         return r;
         }
diff --git a/src/basic/proc-cmdline.h b/src/basic/proc-cmdline.h
index 452642a2f5..6d6ee95c11 100644
--- a/src/basic/proc-cmdline.h
+++ b/src/basic/proc-cmdline.h
@@ -20,7 +20,9 @@
 ***/
 
 int proc_cmdline(char **ret);
-int parse_proc_cmdline(int (*parse_word)(const char *key, const char *value));
+int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value, void *data),
+                       void *data,
+                       bool strip_prefix);
 int get_proc_cmdline_key(const char *parameter, char **value);
 
 int shall_restore_state(void);
diff --git a/src/core/main.c b/src/core/main.c
index 498e289a83..94602611a7 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -308,7 +308,7 @@ static int set_machine_id(const char *m) {
         return 0;
 }
 
-static int parse_proc_cmdline_item(const char *key, const char *value) {
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
 
         int r;
 
@@ -1569,7 +1569,7 @@ int main(int argc, char *argv[]) {
         }
 
         if (arg_system) {
-                r = parse_proc_cmdline(parse_proc_cmdline_item);
+                r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, false);
                 if (r < 0)
                         log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
         }
diff --git a/src/cryptsetup/cryptsetup-generator.c b/src/cryptsetup/cryptsetup-generator.c
index de0a3b6f9c..e2dc4327fe 100644
--- a/src/cryptsetup/cryptsetup-generator.c
+++ b/src/cryptsetup/cryptsetup-generator.c
@@ -277,12 +277,12 @@ static crypto_device *get_crypto_device(const char *uuid) {
         return d;
 }
 
-static int parse_proc_cmdline_item(const char *key, const char *value) {
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
         int r;
         crypto_device *d;
         _cleanup_free_ char *uuid = NULL, *uuid_value = NULL;
 
-        if (STR_IN_SET(key, "luks", "rd.luks") && value) {
+        if (streq(key, "luks") && value) {
 
                 r = parse_boolean(value);
                 if (r < 0)
@@ -290,7 +290,7 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
                 else
                         arg_enabled = r;
 
-        } else if (STR_IN_SET(key, "luks.crypttab", "rd.luks.crypttab") && value) {
+        } else if (streq(key, "luks.crypttab") && value) {
 
                 r = parse_boolean(value);
                 if (r < 0)
@@ -298,7 +298,7 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
                 else
                         arg_read_crypttab = r;
 
-        } else if (STR_IN_SET(key, "luks.uuid", "rd.luks.uuid") && value) {
+        } else if (streq(key, "luks.uuid") && value) {
 
                 d = get_crypto_device(startswith(value, "luks-") ? value+5 : value);
                 if (!d)
@@ -306,7 +306,7 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
 
                 d->create = arg_whitelist = true;
 
-        } else if (STR_IN_SET(key, "luks.options", "rd.luks.options") && value) {
+        } else if (streq(key, "luks.options") && value) {
 
                 r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value);
                 if (r == 2) {
@@ -320,7 +320,7 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
                 } else if (free_and_strdup(&arg_default_options, value) < 0)
                         return log_oom();
 
-        } else if (STR_IN_SET(key, "luks.key", "rd.luks.key") && value) {
+        } else if (streq(key, "luks.key") && value) {
 
                 r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value);
                 if (r == 2) {
@@ -334,7 +334,7 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
                 } else if (free_and_strdup(&arg_default_keyfile, value) < 0)
                         return log_oom();
 
-        } else if (STR_IN_SET(key, "luks.name", "rd.luks.name") && value) {
+        } else if (streq(key, "luks.name") && value) {
 
                 r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value);
                 if (r == 2) {
@@ -478,7 +478,7 @@ int main(int argc, char *argv[]) {
         if (!arg_disks)
                 goto cleanup;
 
-        r = parse_proc_cmdline(parse_proc_cmdline_item);
+        r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, true);
         if (r < 0) {
                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
                 r = EXIT_FAILURE;
diff --git a/src/debug-generator/debug-generator.c b/src/debug-generator/debug-generator.c
index 7e80af78e7..7f11ec724d 100644
--- a/src/debug-generator/debug-generator.c
+++ b/src/debug-generator/debug-generator.c
@@ -33,7 +33,7 @@ static char **arg_mask = NULL;
 static char **arg_wants = NULL;
 static bool arg_debug_shell = false;
 
-static int parse_proc_cmdline_item(const char *key, const char *value) {
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
         int r;
 
         assert(key);
@@ -178,7 +178,7 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
-        r = parse_proc_cmdline(parse_proc_cmdline_item);
+        r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, false);
         if (r < 0)
                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 
diff --git a/src/fsck/fsck.c b/src/fsck/fsck.c
index d32e1d923e..be25c6a2b2 100644
--- a/src/fsck/fsck.c
+++ b/src/fsck/fsck.c
@@ -94,7 +94,7 @@ static void start_target(const char *target, const char *mode) {
                 log_error("Failed to start unit: %s", bus_error_message(&error, r));
 }
 
-static int parse_proc_cmdline_item(const char *key, const char *value) {
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
         int r;
 
         assert(key);
@@ -293,7 +293,7 @@ int main(int argc, char *argv[]) {
 
         umask(0022);
 
-        r = parse_proc_cmdline(parse_proc_cmdline_item);
+        r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, true);
         if (r < 0)
                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 
diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
index 33af553d0d..e77bd71a52 100644
--- a/src/fstab-generator/fstab-generator.c
+++ b/src/fstab-generator/fstab-generator.c
@@ -590,7 +590,7 @@ static int add_sysroot_usr_mount(void) {
                          "/proc/cmdline");
 }
 
-static int parse_proc_cmdline_item(const char *key, const char *value) {
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
         int r;
 
         /* root=, usr=, usrfstype= and roofstype= may occur more than once, the last
@@ -674,7 +674,7 @@ int main(int argc, char *argv[]) {
 
         umask(0022);
 
-        r = parse_proc_cmdline(parse_proc_cmdline_item);
+        r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, false);
         if (r < 0)
                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 
diff --git a/src/gpt-auto-generator/gpt-auto-generator.c b/src/gpt-auto-generator/gpt-auto-generator.c
index 6cc1aad705..a098b27a8e 100644
--- a/src/gpt-auto-generator/gpt-auto-generator.c
+++ b/src/gpt-auto-generator/gpt-auto-generator.c
@@ -907,7 +907,7 @@ fallback:
         return 1;
 }
 
-static int parse_proc_cmdline_item(const char *key, const char *value) {
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
         int r;
 
         assert(key);
@@ -1018,7 +1018,7 @@ int main(int argc, char *argv[]) {
                 return EXIT_SUCCESS;
         }
 
-        r = parse_proc_cmdline(parse_proc_cmdline_item);
+        r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, false);
         if (r < 0)
                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 
diff --git a/src/hibernate-resume/hibernate-resume-generator.c b/src/hibernate-resume/hibernate-resume-generator.c
index d7ee80d58f..17e670604e 100644
--- a/src/hibernate-resume/hibernate-resume-generator.c
+++ b/src/hibernate-resume/hibernate-resume-generator.c
@@ -33,7 +33,7 @@
 static const char *arg_dest = "/tmp";
 static char *arg_resume_dev = NULL;
 
-static int parse_proc_cmdline_item(const char *key, const char *value) {
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
 
         if (streq(key, "resume") && value) {
                 free(arg_resume_dev);
@@ -88,7 +88,7 @@ int main(int argc, char *argv[]) {
         if (!in_initrd())
                 return EXIT_SUCCESS;
 
-        r = parse_proc_cmdline(parse_proc_cmdline_item);
+        r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, false);
         if (r < 0)
                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 
diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
index 44962bc5d6..908c7b8eeb 100644
--- a/src/journal/journald-server.c
+++ b/src/journal/journald-server.c
@@ -1526,85 +1526,68 @@ static int setup_signals(Server *s) {
         return 0;
 }
 
-static int server_parse_proc_cmdline(Server *s) {
-        _cleanup_free_ char *line = NULL;
-        const char *p;
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
+        Server *s = data;
         int r;
 
-        r = proc_cmdline(&line);
-        if (r < 0) {
-                log_warning_errno(r, "Failed to read /proc/cmdline, ignoring: %m");
-                return 0;
-        }
-
-        p = line;
-        for (;;) {
-                _cleanup_free_ char *word = NULL;
+        assert(s);
 
-                r = extract_first_word(&p, &word, NULL, 0);
+        if (streq(key, "systemd.journald.forward_to_syslog")) {
+                r = value ? parse_boolean(value) : true;
                 if (r < 0)
-                        return log_error_errno(r, "Failed to parse journald syntax \"%s\": %m", line);
-
-                if (r == 0)
-                        break;
-
-                if (startswith(word, "systemd.journald.forward_to_syslog=")) {
-                        r = parse_boolean(word + 35);
-                        if (r < 0)
-                                log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
-                        else
-                                s->forward_to_syslog = r;
-                } else if (startswith(word, "systemd.journald.forward_to_kmsg=")) {
-                        r = parse_boolean(word + 33);
-                        if (r < 0)
-                                log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
-                        else
-                                s->forward_to_kmsg = r;
-                } else if (startswith(word, "systemd.journald.forward_to_console=")) {
-                        r = parse_boolean(word + 36);
-                        if (r < 0)
-                                log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
-                        else
-                                s->forward_to_console = r;
-                } else if (startswith(word, "systemd.journald.forward_to_wall=")) {
-                        r = parse_boolean(word + 33);
-                        if (r < 0)
-                                log_warning("Failed to parse forward to wall switch %s. Ignoring.", word + 33);
-                        else
-                                s->forward_to_wall = r;
-                } else if (startswith(word, "systemd.journald.max_level_console=")) {
-                        r = log_level_from_string(word + 35);
-                        if (r < 0)
-                                log_warning("Failed to parse max level console value %s. Ignoring.", word + 35);
-                        else
-                                s->max_level_console = r;
-                } else if (startswith(word, "systemd.journald.max_level_store=")) {
-                        r = log_level_from_string(word + 33);
-                        if (r < 0)
-                                log_warning("Failed to parse max level store value %s. Ignoring.", word + 33);
-                        else
-                                s->max_level_store = r;
-                } else if (startswith(word, "systemd.journald.max_level_syslog=")) {
-                        r = log_level_from_string(word + 34);
-                        if (r < 0)
-                                log_warning("Failed to parse max level syslog value %s. Ignoring.", word + 34);
-                        else
-                                s->max_level_syslog = r;
-                } else if (startswith(word, "systemd.journald.max_level_kmsg=")) {
-                        r = log_level_from_string(word + 32);
-                        if (r < 0)
-                                log_warning("Failed to parse max level kmsg value %s. Ignoring.", word + 32);
-                        else
-                                s->max_level_kmsg = r;
-                } else if (startswith(word, "systemd.journald.max_level_wall=")) {
-                        r = log_level_from_string(word + 32);
-                        if (r < 0)
-                                log_warning("Failed to parse max level wall value %s. Ignoring.", word + 32);
-                        else
-                                s->max_level_wall = r;
-                } else if (startswith(word, "systemd.journald"))
-                        log_warning("Invalid systemd.journald parameter. Ignoring.");
-        }
+                        log_warning("Failed to parse forward to syslog switch \"%s\". Ignoring.", value);
+                else
+                        s->forward_to_syslog = r;
+        } else if (streq(key, "systemd.journald.forward_to_kmsg")) {
+                r = value ? parse_boolean(value) : true;
+                if (r < 0)
+                        log_warning("Failed to parse forward to kmsg switch \"%s\". Ignoring.", value);
+                else
+                        s->forward_to_kmsg = r;
+        } else if (streq(key, "systemd.journald.forward_to_console")) {
+                r = value ? parse_boolean(value) : true;
+                if (r < 0)
+                        log_warning("Failed to parse forward to console switch \"%s\". Ignoring.", value);
+                else
+                        s->forward_to_console = r;
+        } else if (streq(key, "systemd.journald.forward_to_wall")) {
+                r = value ? parse_boolean(value) : true;
+                if (r < 0)
+                        log_warning("Failed to parse forward to wall switch \"%s\". Ignoring.", value);
+                else
+                        s->forward_to_wall = r;
+        } else if (streq(key, "systemd.journald.max_level_console") && value) {
+                r = log_level_from_string(value);
+                if (r < 0)
+                        log_warning("Failed to parse max level console value \"%s\". Ignoring.", value);
+                else
+                        s->max_level_console = r;
+        } else if (streq(key, "systemd.journald.max_level_store") && value) {
+                r = log_level_from_string(value);
+                if (r < 0)
+                        log_warning("Failed to parse max level store value \"%s\". Ignoring.", value);
+                else
+                        s->max_level_store = r;
+        } else if (streq(key, "systemd.journald.max_level_syslog") && value) {
+                r = log_level_from_string(value);
+                if (r < 0)
+                        log_warning("Failed to parse max level syslog value \"%s\". Ignoring.", value);
+                else
+                        s->max_level_syslog = r;
+        } else if (streq(key, "systemd.journald.max_level_kmsg") && value) {
+                r = log_level_from_string(value);
+                if (r < 0)
+                        log_warning("Failed to parse max level kmsg value \"%s\". Ignoring.", value);
+                else
+                        s->max_level_kmsg = r;
+        } else if (streq(key, "systemd.journald.max_level_wall") && value) {
+                r = log_level_from_string(value);
+                if (r < 0)
+                        log_warning("Failed to parse max level wall value \"%s\". Ignoring.", value);
+                else
+                        s->max_level_wall = r;
+        } else if (startswith(key, "systemd.journald"))
+                log_warning("Unknown journald kernel command line option \"%s\". Ignoring.", key);
 
         /* do not warn about state here, since probably systemd already did */
         return 0;
@@ -1915,7 +1898,7 @@ int server_init(Server *s) {
         journal_reset_metrics(&s->runtime_storage.metrics);
 
         server_parse_config_file(s);
-        server_parse_proc_cmdline(s);
+        parse_proc_cmdline(parse_proc_cmdline_item, s, true);
 
         if (!!s->rate_limit_interval ^ !!s->rate_limit_burst) {
                 log_debug("Setting both rate limit interval and burst from "USEC_FMT",%u to 0,0",
diff --git a/src/modules-load/modules-load.c b/src/modules-load/modules-load.c
index f75015d8c3..0901fea8dc 100644
--- a/src/modules-load/modules-load.c
+++ b/src/modules-load/modules-load.c
@@ -59,10 +59,10 @@ static int add_modules(const char *p) {
         return 0;
 }
 
-static int parse_proc_cmdline_item(const char *key, const char *value) {
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
         int r;
 
-        if (STR_IN_SET(key, "modules-load", "rd.modules-load") && value) {
+        if (streq(key, "modules-load") && value) {
                 r = add_modules(value);
                 if (r < 0)
                         return r;
@@ -226,7 +226,7 @@ int main(int argc, char *argv[]) {
 
         umask(0022);
 
-        r = parse_proc_cmdline(parse_proc_cmdline_item);
+        r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, true);
         if (r < 0)
                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 
diff --git a/src/quotacheck/quotacheck.c b/src/quotacheck/quotacheck.c
index 6d8c05f046..2714cde5c7 100644
--- a/src/quotacheck/quotacheck.c
+++ b/src/quotacheck/quotacheck.c
@@ -32,7 +32,7 @@
 static bool arg_skip = false;
 static bool arg_force = false;
 
-static int parse_proc_cmdline_item(const char *key, const char *value) {
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
 
         if (streq(key, "quotacheck.mode") && value) {
 
@@ -88,7 +88,7 @@ int main(int argc, char *argv[]) {
 
         umask(0022);
 
-        r = parse_proc_cmdline(parse_proc_cmdline_item);
+        r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, false);
         if (r < 0)
                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 
diff --git a/src/test/test-proc-cmdline.c b/src/test/test-proc-cmdline.c
index 80ad5ed98b..4101678f19 100644
--- a/src/test/test-proc-cmdline.c
+++ b/src/test/test-proc-cmdline.c
@@ -25,15 +25,18 @@
 #include "string-util.h"
 #include "util.h"
 
-static int parse_item(const char *key, const char *value) {
+static int obj;
+
+static int parse_item(const char *key, const char *value, void *data) {
         assert_se(key);
+        assert_se(data == &obj);
 
         log_info("kernel cmdline option <%s> = <%s>", key, strna(value));
         return 0;
 }
 
 static void test_parse_proc_cmdline(void) {
-        assert_se(parse_proc_cmdline(parse_item) >= 0);
+        assert_se(parse_proc_cmdline(parse_item, &obj, true) >= 0);
 }
 
 static void test_runlevel_to_target(void) {
diff --git a/src/udev/udevd.c b/src/udev/udevd.c
index 535d317c27..badbab6205 100644
--- a/src/udev/udevd.c
+++ b/src/udev/udevd.c
@@ -1362,49 +1362,33 @@ static int listen_fds(int *rctrl, int *rnetlink) {
  *   udev.exec-delay=<number of seconds>       delay execution of every executed program
  *   udev.event-timeout=<number of seconds>    seconds to wait before terminating an event
  */
-static int parse_proc_cmdline_item(const char *key, const char *value) {
-        const char *full_key = key;
-        int r;
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
+        int r = 0;
 
         assert(key);
 
         if (!value)
                 return 0;
 
-        if (startswith(key, "rd."))
-                key += strlen("rd.");
-
-        if (startswith(key, "udev."))
-                key += strlen("udev.");
-        else
-                return 0;
-
-        if (streq(key, "log-priority")) {
-                int prio;
-
-                prio = util_log_priority(value);
-                if (prio < 0)
-                        goto invalid;
-                log_set_max_level(prio);
-        } else if (streq(key, "children-max")) {
+        if (streq(key, "udev.log-priority") && value) {
+                r = util_log_priority(value);
+                if (r >= 0)
+                        log_set_max_level(r);
+        } else if (streq(key, "udev.event-timeout") && value) {
+                r = safe_atou64(value, &arg_event_timeout_usec);
+                if (r >= 0) {
+                        arg_event_timeout_usec *= USEC_PER_SEC;
+                        arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
+                }
+        } else if (streq(key, "udev.children-max") && value)
                 r = safe_atou(value, &arg_children_max);
-                if (r < 0)
-                        goto invalid;
-        } else if (streq(key, "exec-delay")) {
+        else if (streq(key, "udev.exec-delay") && value)
                 r = safe_atoi(value, &arg_exec_delay);
-                if (r < 0)
-                        goto invalid;
-        } else if (streq(key, "event-timeout")) {
-                r = safe_atou64(value, &arg_event_timeout_usec);
-                if (r < 0)
-                        goto invalid;
-                arg_event_timeout_usec *= USEC_PER_SEC;
-                arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
-        }
+        else if (startswith(key, "udev."))
+                log_warning("Unknown udev kernel command line option \"%s\"", key);
 
-        return 0;
-invalid:
-        log_warning("invalid %s ignored: %s", full_key, value);
+        if (r < 0)
+                log_warning_errno(r, "Failed to parse \"%s=%s\", ignoring: %m", key, value);
         return 0;
 }
 
@@ -1665,7 +1649,7 @@ int main(int argc, char *argv[]) {
         if (r <= 0)
                 goto exit;
 
-        r = parse_proc_cmdline(parse_proc_cmdline_item);
+        r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, true);
         if (r < 0)
                 log_warning_errno(r, "failed to parse kernel command line, ignoring: %m");