add a prefix option for messages streamed using logread

Signed-off-by: Robin Kuck <robin@basicinside.de>

diff --git a/logread.c b/logread.c
index bd8c69710bb50671e225a0783444a5c5a1b0296b..81d220452f5a0ec5aae5e57803789ba7b5070b15 100644 (file)
--- a/logread.c
+++ b/logread.c
@@ -56,7 +56,7 @@ static const struct blobmsg_policy log_policy[] = {
 static struct ubus_subscriber log_event;
 static struct uloop_timeout retry;
 static struct uloop_fd sender;
-static const char *log_file, *log_ip, *log_port, *pid_file;
+static const char *log_file, *log_ip, *log_port, *log_prefix, *pid_file;
 static int log_type = LOG_STDOUT;
 static int log_size, log_udp;
 
@@ -104,7 +104,7 @@ static int log_notify(struct ubus_context *ctx, struct ubus_object *obj,
 {
        struct blob_attr *tb[__LOG_MAX];
        struct stat s;
-       char buf[256];
+       char buf[512];
        uint32_t p;
        char *str;
        time_t t;
@@ -140,8 +140,15 @@ static int log_notify(struct ubus_context *ctx, struct ubus_object *obj,
        str = blobmsg_format_json(msg, true);
        if (log_type == LOG_NET) {
                int err;
+               int len;
 
-               snprintf(buf, sizeof(buf), "%s%s\n",
+               *buf = '\0';
+               if (log_prefix)
+                       snprintf(buf, sizeof(buf), "%s: ", log_prefix);
+
+               len = strlen(buf);
+
+               snprintf(&buf[len], sizeof(buf) - len, "%s%s\n",
                        (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("") : ("kernel: "),
                        method);
                if (log_udp)
@@ -280,6 +287,7 @@ static int usage(const char *prog)
                "    -F <file>          Log file\n"
                "    -S <bytes>         Log size\n"
                "    -p <file>          PID file\n"
+               "    -P <prefix>        Prefix custom text to streamed messages\n"
                "    -f                 Follow log messages\n"
                "    -u                 Use UDP as the protocol\n"
                "\n", prog);
@@ -294,7 +302,7 @@ int main(int argc, char **argv)
        int ch, ret, subscribe = 0, lines = 0;
        static struct blob_buf b;
 
-       while ((ch = getopt(argc, argv, "ufcs:l:r:F:p:S:")) != -1) {
+       while ((ch = getopt(argc, argv, "ufcs:l:r:F:p:S:P:")) != -1) {
                switch (ch) {
                case 'u':
                        log_udp = 1;
@@ -312,6 +320,9 @@ int main(int argc, char **argv)
                case 'p':
                        pid_file = optarg;
                        break;
+               case 'P':
+                       log_prefix = optarg;
+                       break;
                case 'f':
                        subscribe = 1;
                        break;