journalctl: add new switch -b to show data from current boot only

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

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index daf428106518a55632d0297e282aafd419250b19..6929b7601867302d466abf960f3324eb4acb5016 100644 (file)
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -35,12 +35,11 @@
 
 #include "log.h"
 #include "util.h"
+#include "path-util.h"
 #include "build.h"
 #include "pager.h"
 #include "logs-show.h"
 
-#define SD_JOURNALCTL_EXE "_EXE="
-
 static OutputMode arg_output = OUTPUT_SHORT;
 static bool arg_follow = false;
 static bool arg_show_all = false;
@@ -50,6 +49,7 @@ 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) {
 
@@ -65,8 +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;
@@ -93,6 +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             }
         };
 
@@ -101,7 +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) {
 
@@ -160,6 +162,10 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_local = true;
                         break;
 
+                case 'b':
+                        arg_this_boot = true;
+                        break;
+
                 case '?':
                         return -EINVAL;
 
@@ -209,7 +215,6 @@ int main(int argc, char *argv[]) {
         unsigned line = 0;
         bool need_seek = false;
         struct stat st;
-        char* journal_exe_buff;
 
         log_parse_environment();
         log_open();
@@ -234,26 +239,62 @@ 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++) {
-                if (strchr(argv[i], '=')) {
-                        r = sd_journal_add_match(j, argv[i], strlen(argv[i]));
-                } else {
-                        if (stat(argv[i], &st) < 0) {
-                                log_error("Failed to add match: %s", strerror(-r));
-                                goto finish; /* maybe try sd_journal_add_match() when stat() fails,
-                                              * even thought we know there is no '=' ? */
-                        } else if (S_ISREG(st.st_mode) &&
-                                   S_IXUSR & st.st_mode) {
-                                journal_exe_buff = malloc(strlen(SD_JOURNALCTL_EXE) + strlen(argv[i]) + 1);
-                                journal_exe_buff = strcpy(journal_exe_buff, SD_JOURNALCTL_EXE);
-                                strncat(journal_exe_buff, argv[i], strlen(argv[i]));
-                                r = sd_journal_add_match(j, journal_exe_buff, strlen(journal_exe_buff));
-                                free(journal_exe_buff);
+                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;
@@ -266,6 +307,26 @@ int main(int argc, char *argv[]) {
                 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) {
                 r = sd_journal_seek_tail(j);
                 if (r < 0) {