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journalctl: New option --cursor-file
The option cursor-file takes a filename as argument. If the file exists and contains a valid cursor, this is used to start the output after this position. At the end, the last cursor gets written to the file. This allows for an easy implementation of a timer that regularly looks in the journal for some messages. journalctl --cursor-file err-cursor -b -p err journalctl --cursor-file audit-cursor -t audit --grep DENIED Or you might want to walk the journal in steps of 10 messages: journalctl --cursor-file ./curs -n10 --since=today -t systemd
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@ -618,6 +618,17 @@
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journal specified by the passed cursor.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--cursor-file=<replaceable>FILE</replaceable></option></term>
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<listitem><para>If <replaceable>FILE</replaceable> exists and contains a
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cursor, start showing entries <emphasis>after</emphasis> this location.
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Otherwise the show entries according the other given options. At the end,
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write the cursor of the last entry to <replaceable>FILE</replaceable>. Use
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this option to continually read the journal by sequentially calling
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<command>journalctl</command>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--after-cursor=</option></term>
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@ -48,7 +48,7 @@ _journalctl() {
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-M --machine -o --output -u --unit --user-unit -p --priority
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--root --case-sensitive'
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[ARGUNKNOWN]='-c --cursor --interval -n --lines -S --since -U --until
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--after-cursor --verify-key -g --grep
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--after-cursor --cursor-file --verify-key -g --grep
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--vacuum-size --vacuum-time --vacuum-files --output-fields'
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)
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@ -104,6 +104,7 @@ _arguments -s \
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{-p+,--priority=}'[Show only messages within the specified priority range]:priority:_journalctl_field_values PRIORITY' \
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{-t+,--identifier=}'[Show only messages with the specified syslog identifier]:identifier:_journalctl_field_values SYSLOG_IDENTIFIER' \
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{-c+,--cursor=}'[Start showing entries from the specified cursor]:cursors:_journalctl_field_values __CURSORS' \
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'--cursor-file=[Show entries using cursor store in file]:file:_files' \
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'--after-cursor=[Start showing entries from after the specified cursor]:cursors:_journalctl_field_values __CURSORS' \
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'--since=[Start showing entries on or newer than the specified date]:YYYY-MM-DD HH\:MM\:SS' \
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'--until=[Stop showing entries on or older than the specified date]:YYYY-MM-DD HH\:MM\:SS' \
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@ -119,6 +119,7 @@ static int arg_boot_offset = 0;
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static bool arg_dmesg = false;
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static bool arg_no_hostname = false;
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static const char *arg_cursor = NULL;
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static const char *arg_cursor_file = NULL;
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static const char *arg_after_cursor = NULL;
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static bool arg_show_cursor = false;
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static const char *arg_directory = NULL;
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@ -315,6 +316,7 @@ static int help(void) {
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" -c --cursor=CURSOR Show entries starting at the specified cursor\n"
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" --after-cursor=CURSOR Show entries after the specified cursor\n"
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" --show-cursor Print the cursor after all the entries\n"
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" --cursor-file=FILE Show entries after cursor in FILE and update FILE\n"
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" -b --boot[=ID] Show current boot or the specified boot\n"
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" --list-boots Show terse information about recorded boots\n"
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" -k --dmesg Show kernel message log from the current boot\n"
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@ -396,6 +398,7 @@ static int parse_argv(int argc, char *argv[]) {
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ARG_VERIFY_KEY,
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ARG_DISK_USAGE,
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ARG_AFTER_CURSOR,
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ARG_CURSOR_FILE,
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ARG_SHOW_CURSOR,
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ARG_USER_UNIT,
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ARG_LIST_CATALOG,
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@ -450,6 +453,7 @@ static int parse_argv(int argc, char *argv[]) {
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{ "verify-key", required_argument, NULL, ARG_VERIFY_KEY },
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{ "disk-usage", no_argument, NULL, ARG_DISK_USAGE },
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{ "cursor", required_argument, NULL, 'c' },
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{ "cursor-file", required_argument, NULL, ARG_CURSOR_FILE },
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{ "after-cursor", required_argument, NULL, ARG_AFTER_CURSOR },
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{ "show-cursor", no_argument, NULL, ARG_SHOW_CURSOR },
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{ "since", required_argument, NULL, 'S' },
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@ -661,6 +665,10 @@ static int parse_argv(int argc, char *argv[]) {
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arg_cursor = optarg;
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break;
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case ARG_CURSOR_FILE:
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arg_cursor_file = optarg;
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break;
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case ARG_AFTER_CURSOR:
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arg_after_cursor = optarg;
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break;
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@ -2077,6 +2085,7 @@ static int wait_for_change(sd_journal *j, int poll_fd) {
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int main(int argc, char *argv[]) {
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bool previous_boot_id_valid = false, first_line = true, ellipsized = false, need_seek = false;
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bool use_cursor = false, after_cursor = false;
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_cleanup_(sd_journal_closep) sd_journal *j = NULL;
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sd_id128_t previous_boot_id;
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int n_shown = 0, r, poll_fd = -1;
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@ -2420,19 +2429,41 @@ int main(int argc, char *argv[]) {
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}
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}
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if (arg_cursor || arg_after_cursor) {
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r = sd_journal_seek_cursor(j, arg_cursor ?: arg_after_cursor);
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if (arg_cursor || arg_after_cursor || arg_cursor_file) {
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_cleanup_free_ char *cursor_from_file = NULL;
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const char *cursor = arg_cursor ?: arg_after_cursor;
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if (arg_cursor_file) {
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r = read_one_line_file(arg_cursor_file, &cursor_from_file);
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if (r < 0 && r != -ENOENT) {
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log_error_errno(r, "Failed to read cursor file %s: %m", arg_cursor_file);
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goto finish;
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}
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if (r > 0) {
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cursor = cursor_from_file;
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after_cursor = true;
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}
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} else
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after_cursor = !!arg_after_cursor;
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if (cursor) {
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r = sd_journal_seek_cursor(j, cursor);
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if (r < 0) {
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log_error_errno(r, "Failed to seek to cursor: %m");
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goto finish;
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}
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use_cursor = true;
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}
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}
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if (use_cursor) {
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if (!arg_reverse)
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r = sd_journal_next_skip(j, 1 + !!arg_after_cursor);
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r = sd_journal_next_skip(j, 1 + after_cursor);
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else
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r = sd_journal_previous_skip(j, 1 + !!arg_after_cursor);
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r = sd_journal_previous_skip(j, 1 + after_cursor);
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if (arg_after_cursor && r < 2) {
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if (after_cursor && r < 2) {
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/* We couldn't find the next entry after the cursor. */
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if (arg_follow)
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need_seek = true;
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@ -2661,14 +2692,26 @@ int main(int argc, char *argv[]) {
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if (n_shown == 0 && !arg_quiet)
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printf("-- No entries --\n");
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if (arg_show_cursor) {
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if (arg_show_cursor || arg_cursor_file) {
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_cleanup_free_ char *cursor = NULL;
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r = sd_journal_get_cursor(j, &cursor);
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if (r < 0 && r != -EADDRNOTAVAIL)
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log_error_errno(r, "Failed to get cursor: %m");
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else if (r >= 0)
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else if (r >= 0) {
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if (arg_show_cursor)
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printf("-- cursor: %s\n", cursor);
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if (arg_cursor_file) {
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r = write_string_file(arg_cursor_file, cursor,
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WRITE_STRING_FILE_CREATE |
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WRITE_STRING_FILE_ATOMIC);
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if (r < 0)
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log_error_errno(r,
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"Failed to write new cursor to %s: %m",
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arg_cursor_file);
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}
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}
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}
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break;
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