journalctl: add command line parsing

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

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 6f4342e59725c24a40198bf9137f671092450f06..5a1cb6e88a7ab8169d985f1aba913634fa67ec96 100644 (file)
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -28,10 +28,13 @@
 #include <stdlib.h>
 #include <sys/poll.h>
 #include <time.h>
+#include <getopt.h>
 
 #include "sd-journal.h"
 #include "log.h"
 #include "util.h"
+#include "build.h"
+#include "pager.h"
 
 #define PRINT_THRESHOLD 128
 
@@ -41,10 +44,11 @@ static enum {
         OUTPUT_EXPORT,
         OUTPUT_JSON,
         _OUTPUT_MAX
-} arg_output = OUTPUT_JSON;
+} arg_output = OUTPUT_SHORT;
 
 static bool arg_follow = false;
 static bool arg_show_all = false;
+static bool arg_no_pager = false;
 
 static bool contains_unprintable(const void *p, size_t l) {
         const char *j;
@@ -345,6 +349,96 @@ static int (*output_funcs[_OUTPUT_MAX])(sd_journal*j, unsigned line) = {
         [OUTPUT_JSON] = output_json
 };
 
+static int help(void) {
+
+        printf("%s [OPTIONS...] {COMMAND} ...\n\n"
+               "Send control commands to or query the login manager.\n\n"
+               "  -h --help           Show this help\n"
+               "     --version        Show package version\n"
+               "     --no-pager       Do not pipe output into a pager\n"
+               "  -a --all            Show all properties, including long and unprintable\n"
+               "  -f --follow         Follow journal\n"
+               "  -o --output=STRING  Change output mode (short, verbose, export, json)\n",
+               program_invocation_short_name);
+
+        return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+        enum {
+                ARG_VERSION = 0x100,
+                ARG_NO_PAGER
+        };
+
+        static const struct option options[] = {
+                { "help",      no_argument,       NULL, 'h'           },
+                { "version" ,  no_argument,       NULL, ARG_VERSION   },
+                { "no-pager",  no_argument,       NULL, ARG_NO_PAGER  },
+                { "follow",    no_argument,       NULL, 'f'           },
+                { "output",    required_argument, NULL, 'o'           },
+                { "all",       no_argument,       NULL, 'a'           },
+                { NULL,        0,                 NULL, 0             }
+        };
+
+        int c;
+
+        assert(argc >= 0);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "hfo:a", options, NULL)) >= 0) {
+
+                switch (c) {
+
+                case 'h':
+                        help();
+                        return 0;
+
+                case ARG_VERSION:
+                        puts(PACKAGE_STRING);
+                        puts(DISTRIBUTION);
+                        puts(SYSTEMD_FEATURES);
+                        return 0;
+
+                case ARG_NO_PAGER:
+                        arg_no_pager = true;
+                        break;
+
+                case 'f':
+                        arg_follow = true;
+                        break;
+
+                case 'o':
+                        if (streq(optarg, "short"))
+                                arg_output = OUTPUT_SHORT;
+                        else if (streq(optarg, "verbose"))
+                                arg_output = OUTPUT_VERBOSE;
+                        else if (streq(optarg, "export"))
+                                arg_output = OUTPUT_EXPORT;
+                        else if (streq(optarg, "json"))
+                                arg_output = OUTPUT_JSON;
+                        else {
+                                log_error("Unknown output '%s'.", optarg);
+                                return -EINVAL;
+                        }
+                        break;
+
+                case 'a':
+                        arg_show_all = true;
+                        break;
+
+                case '?':
+                        return -EINVAL;
+
+                default:
+                        log_error("Unknown option code %c", c);
+                        return -EINVAL;
+                }
+        }
+
+        return 1;
+}
+
 int main(int argc, char *argv[]) {
         int r, i, fd;
         sd_journal *j = NULL;
@@ -356,13 +450,17 @@ int main(int argc, char *argv[]) {
         log_parse_environment();
         log_open();
 
+        r = parse_argv(argc, argv);
+        if (r <= 0)
+                goto finish;
+
         r = sd_journal_open(&j);
         if (r < 0) {
                 log_error("Failed to open journal: %s", strerror(-r));
                 goto finish;
         }
 
-        for (i = 1; i < argc; i++) {
+        for (i = optind; i < argc; i++) {
                 r = sd_journal_add_match(j, argv[i], strlen(argv[i]));
                 if (r < 0) {
                         log_error("Failed to add match: %s", strerror(-r));
@@ -382,13 +480,30 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
-        if (arg_output == OUTPUT_JSON)
+        if (!arg_no_pager && !arg_follow) {
+                columns();
+                pager_open();
+        }
+
+        if (arg_output == OUTPUT_JSON) {
                 fputc('[', stdout);
+                fflush(stdout);
+        }
 
         for (;;) {
                 struct pollfd pollfd;
 
-                while (sd_journal_next(j) > 0) {
+                for (;;) {
+                        r = sd_journal_next(j);
+
+                        if (r < 0) {
+                                log_error("Failed to iterate through journal: %s", strerror(-r));
+                                goto finish;
+                        }
+
+                        if (r == 0)
+                                break;
+
                         line ++;
 
                         r = output_funcs[arg_output](j, line);
@@ -426,5 +541,7 @@ finish:
         if (j)
                 sd_journal_close(j);
 
+        pager_close();
+
         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }