Merge branch 'python-systemd-reader'

[elogind.git] / src / journal / journalctl.c

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index a74d43be7f2e2aecf76325b7dac8538e5f1dbb87..90845097049b183098417325c74239118b6e1697 100644 (file)
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -60,7 +60,7 @@ static bool arg_follow = false;
 static bool arg_full = false;
 static bool arg_all = false;
 static bool arg_no_pager = false;
-static unsigned arg_lines = 0;
+static int arg_lines = -1;
 static bool arg_no_tail = false;
 static bool arg_quiet = false;
 static bool arg_merge = false;
@@ -239,13 +239,30 @@ static int parse_argv(int argc, char *argv[]) {
 
                 case 'n':
                         if (optarg) {
-                                r = safe_atou(optarg, &arg_lines);
-                                if (r < 0 || arg_lines <= 0) {
+                                r = safe_atoi(optarg, &arg_lines);
+                                if (r < 0 || arg_lines < 0) {
                                         log_error("Failed to parse lines '%s'", optarg);
                                         return -EINVAL;
                                 }
-                        } else
-                                arg_lines = 10;
+                        } else {
+                                int n;
+
+                                /* Hmm, no argument? Maybe the next
+                                 * word on the command line is
+                                 * supposed to be the argument? Let's
+                                 * see if there is one, and is
+                                 * parsable as a positive
+                                 * integer... */
+
+                                if (optind < argc &&
+                                    safe_atoi(argv[optind], &n) >= 0 &&
+                                    n >= 0) {
+
+                                        arg_lines = n;
+                                        optind++;
+                                } else
+                                        arg_lines = 10;
+                        }
 
                         break;
 
@@ -413,10 +430,10 @@ static int parse_argv(int argc, char *argv[]) {
                 }
         }
 
-        if (arg_follow && !arg_no_tail && arg_lines <= 0)
+        if (arg_follow && !arg_no_tail && arg_lines < 0)
                 arg_lines = 10;
 
-        if (arg_since_set && arg_until_set && arg_since_set > arg_until_set) {
+        if (arg_since_set && arg_until_set && arg_since > arg_until) {
                 log_error("--since= must be before --until=.");
                 return -EINVAL;
         }
@@ -445,14 +462,17 @@ static int generate_new_id128(void) {
                "As UUID:\n"
                "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n\n"
                "As macro:\n"
-              "#define MESSAGE_XYZ SD_ID128_MAKE(",
+               "#define MESSAGE_XYZ SD_ID128_MAKE(",
                SD_ID128_FORMAT_VAL(id),
                SD_ID128_FORMAT_VAL(id));
-
         for (i = 0; i < 16; i++)
                 printf("%02x%s", id.bytes[i], i != 15 ? "," : "");
+        fputs(")\n\n", stdout);
 
-        fputs(")\n", stdout);
+        printf("As Python constant:\n"
+               ">>> import uuid\n"
+               ">>> MESSAGE_XYZ = uuid.UUID('" SD_ID128_FORMAT_STR "')\n",
+               SD_ID128_FORMAT_VAL(id));
 
         return 0;
 }
@@ -849,8 +869,8 @@ int main(int argc, char *argv[]) {
         sd_journal *j = NULL;
         bool need_seek = false;
         sd_id128_t previous_boot_id;
-        bool previous_boot_id_valid = false;
-        unsigned n_shown = 0;
+        bool previous_boot_id_valid = false, first_line = true;
+        int n_shown = 0;
 
         setlocale(LC_ALL, "");
         log_parse_environment();
@@ -937,6 +957,11 @@ int main(int argc, char *argv[]) {
         if (r < 0)
                 goto finish;
 
+        /* Opening the fd now means the first sd_journal_wait() will actually wait */
+        r = sd_journal_get_fd(j);
+        if (r < 0)
+                goto finish;
+
         if (arg_field) {
                 const void *data;
                 size_t size;
@@ -950,7 +975,7 @@ int main(int argc, char *argv[]) {
                 SD_JOURNAL_FOREACH_UNIQUE(j, data, size) {
                         const void *eq;
 
-                        if (arg_lines > 0 && n_shown >= arg_lines)
+                        if (arg_lines >= 0 && n_shown >= arg_lines)
                                 break;
 
                         eq = memchr(data, '=', size);
@@ -983,7 +1008,7 @@ int main(int argc, char *argv[]) {
                 }
                 r = sd_journal_next(j);
 
-        } else if (arg_lines > 0) {
+        } else if (arg_lines >= 0) {
                 r = sd_journal_seek_tail(j);
                 if (r < 0) {
                         log_error("Failed to seek to tail: %s", strerror(-r));
@@ -1032,7 +1057,7 @@ int main(int argc, char *argv[]) {
         }
 
         for (;;) {
-                while (arg_lines == 0 || arg_follow || n_shown < arg_lines) {
+                while (arg_lines < 0 || n_shown < arg_lines || (arg_follow && !first_line)) {
                         int flags;
 
                         if (need_seek) {
@@ -1054,6 +1079,8 @@ int main(int argc, char *argv[]) {
                                         log_error("Failed to determine timestamp: %s", strerror(-r));
                                         goto finish;
                                 }
+                                if (usec > arg_until)
+                                        goto finish;
                         }
 
                         if (!arg_merge) {
@@ -1077,7 +1104,7 @@ int main(int argc, char *argv[]) {
                                 arg_catalog * OUTPUT_CATALOG;
 
                         r = output_journal(stdout, j, arg_output, 0, flags);
-                        if (r < 0)
+                        if (r < 0 || ferror(stdout))
                                 goto finish;
 
                         need_seek = true;
@@ -1092,6 +1119,8 @@ int main(int argc, char *argv[]) {
                         log_error("Couldn't wait for journal event: %s", strerror(-r));
                         goto finish;
                 }
+
+                first_line = false;
         }
 
 finish: