journal: introduce sd_journal_wait() to simplify writing synchronous clients

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

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index ebc2a6aa49efd743444123237caa71c415fde8a1..7d8b8e51c82f7beb0316c0e745e2ffbb643a199f 100644 (file)
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -29,11 +29,13 @@
 #include <sys/poll.h>
 #include <time.h>
 #include <getopt.h>
+#include <sys/stat.h>
 
 #include <systemd/sd-journal.h>
 
 #include "log.h"
 #include "util.h"
+#include "path-util.h"
 #include "build.h"
 #include "pager.h"
 #include "logs-show.h"
@@ -47,10 +49,11 @@ static bool arg_no_tail = false;
 static bool arg_new_id128 = false;
 static bool arg_quiet = false;
 static bool arg_local = false;
+static bool arg_this_boot = false;
 
 static int help(void) {
 
-        printf("%s [OPTIONS...] {COMMAND} ...\n\n"
+        printf("%s [OPTIONS...] [MATCH]\n\n"
                "Send control commands to or query the journal.\n\n"
                "  -h --help           Show this help\n"
                "     --version        Show package version\n"
@@ -62,8 +65,9 @@ static int help(void) {
                "  -o --output=STRING  Change journal output mode (short, short-monotonic,\n"
                "                      verbose, export, json, cat)\n"
                "  -q --quiet          Don't show privilege warning\n"
-               "     --new-id128      Generate a new 128 Bit id\n"
-               "  -l --local          Only local entries\n",
+               "  -l --local          Only local entries\n"
+               "  -b --this-boot      Show data only from current boot\n"
+               "     --new-id128      Generate a new 128 Bit id\n",
                program_invocation_short_name);
 
         return 0;
@@ -90,6 +94,7 @@ static int parse_argv(int argc, char *argv[]) {
                 { "new-id128", no_argument,       NULL, ARG_NEW_ID128 },
                 { "quiet",     no_argument,       NULL, 'q'           },
                 { "local",     no_argument,       NULL, 'l'           },
+                { "this-boot", no_argument,       NULL, 'b'           },
                 { NULL,        0,                 NULL, 0             }
         };
 
@@ -98,7 +103,7 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "hfo:an:ql", options, NULL)) >= 0) {
+        while ((c = getopt_long(argc, argv, "hfo:an:qlb", options, NULL)) >= 0) {
 
                 switch (c) {
 
@@ -157,6 +162,10 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_local = true;
                         break;
 
+                case 'b':
+                        arg_this_boot = true;
+                        break;
+
                 case '?':
                         return -EINVAL;
 
@@ -201,10 +210,11 @@ static int generate_new_id128(void) {
 }
 
 int main(int argc, char *argv[]) {
-        int r, i, fd;
+        int r, i;
         sd_journal *j = NULL;
         unsigned line = 0;
         bool need_seek = false;
+        struct stat st;
 
         log_parse_environment();
         log_open();
@@ -229,18 +239,86 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
+        if (arg_this_boot) {
+                char match[9+32+1] = "_BOOT_ID=";
+                sd_id128_t boot_id;
+
+                r = sd_id128_get_boot(&boot_id);
+                if (r < 0) {
+                        log_error("Failed to get boot id: %s", strerror(-r));
+                        goto finish;
+                }
+
+                sd_id128_to_string(boot_id, match + 9);
+
+                r = sd_journal_add_match(j, match, strlen(match));
+                if (r < 0) {
+                        log_error("Failed to add match: %s", strerror(-r));
+                        goto finish;
+                }
+        }
+
         for (i = optind; i < argc; i++) {
-                r = sd_journal_add_match(j, argv[i], strlen(argv[i]));
+                if (path_is_absolute(argv[i])) {
+                        char *p = NULL;
+                        const char *path;
+
+                        p = canonicalize_file_name(argv[i]);
+                        path = p ? p : argv[i];
+
+                        if (stat(path, &st) < 0)  {
+                                free(p);
+                                log_error("Couldn't stat file: %m");
+                                r = -errno;
+                                goto finish;
+                        }
+
+                        if (S_ISREG(st.st_mode) && (0111 & st.st_mode)) {
+                                char *t;
+
+                                t = strappend("_EXE=", path);
+                                if (!t) {
+                                        free(p);
+                                        log_error("Out of memory");
+                                        goto finish;
+                                }
+
+                                r = sd_journal_add_match(j, t, strlen(t));
+                                free(t);
+                        } else {
+                                free(p);
+                                log_error("File is not a regular file or is not executable: %s", argv[i]);
+                                goto finish;
+                        }
+
+                        free(p);
+                } else
+                        r = sd_journal_add_match(j, argv[i], strlen(argv[i]));
+
                 if (r < 0) {
                         log_error("Failed to add match: %s", strerror(-r));
                         goto finish;
                 }
         }
 
-        fd = sd_journal_get_fd(j);
-        if (fd < 0) {
-                log_error("Failed to get wakeup fd: %s", strerror(-fd));
-                goto finish;
+        if (!arg_quiet) {
+                usec_t start, end;
+                char start_buf[FORMAT_TIMESTAMP_MAX], end_buf[FORMAT_TIMESTAMP_MAX];
+
+                r = sd_journal_get_cutoff_realtime_usec(j, &start, &end);
+                if (r < 0) {
+                        log_error("Failed to get cutoff: %s", strerror(-r));
+                        goto finish;
+                }
+
+                if (r > 0) {
+                        if (arg_follow)
+                                printf("Logs begin at %s.\n", format_timestamp(start_buf, sizeof(start_buf), start));
+                        else
+                                printf("Logs begin at %s, end at %s.\n",
+                                       format_timestamp(start_buf, sizeof(start_buf), start),
+                                       format_timestamp(end_buf, sizeof(end_buf), end));
+                }
         }
 
         if (arg_lines >= 0) {
@@ -301,15 +379,9 @@ int main(int argc, char *argv[]) {
                 if (!arg_follow)
                         break;
 
-                r = fd_wait_for_event(fd, POLLIN, (usec_t) -1);
-                if (r < 0) {
-                        log_error("Couldn't wait for event: %s", strerror(-r));
-                        goto finish;
-                }
-
-                r = sd_journal_process(j);
+                r = sd_journal_wait(j, (uint64_t) -1);
                 if (r < 0) {
-                        log_error("Failed to process: %s", strerror(-r));
+                        log_error("Couldn't wait for log event: %s", strerror(-r));
                         goto finish;
                 }
         }