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From e94957b964380c0c9b0f3264ba5e35166d543ca7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Mon, 28 Oct 2013 23:43:57 -0400
Subject: [PATCH] journalctl: add --list-boots to show boot IDs and times
Suggested by David Wilkins <dwilkins@maths.tcd.ie> in
https://bugzilla.redhat.com/show_bug.cgi?id=967521:
> [Specific boot ID is a] bit of a palaver to obtain. I consulted the
> verbose dump of the journal to discover the _BOOT_ID for the
> timestamp, and then generated the journal dump for that boot using
> journalctl _BOOT_ID=foo -o short-monotonic.
---
man/journalctl.xml | 11 ++++
shell-completion/bash/journalctl | 2 +-
shell-completion/zsh/_journalctl | 1 +
src/journal/journalctl.c | 105 +++++++++++++++++++++++++++++++++++++--
4 files changed, 113 insertions(+), 6 deletions(-)
diff --git a/man/journalctl.xml b/man/journalctl.xml
index b5a0c53..c0cc96d 100644
--- a/man/journalctl.xml
+++ b/man/journalctl.xml
@@ -478,6 +478,17 @@
</varlistentry>
<varlistentry>
+ <term><option>--list-boots</option></term>
+
+ <listitem><para>Show a tabular list of
+ boot numbers (relative to current
+ boot), their IDs, and the timestamps
+ of the first and last message
+ pertaining to the boot.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><option>-k</option></term>
<term><option>--dmesg</option></term>
diff --git a/shell-completion/bash/journalctl b/shell-completion/bash/journalctl
index 3c40d57..942a253 100644
--- a/shell-completion/bash/journalctl
+++ b/shell-completion/bash/journalctl
@@ -42,7 +42,7 @@ _journalctl() {
--disk-usage -f --follow --header
-h --help -l --local --new-id128 -m --merge --no-pager
--no-tail -q --quiet --setup-keys --this-boot --verify
- --version --list-catalog --update-catalog'
+ --version --list-catalog --update-catalog --list-boots'
[ARG]='-b --boot --this-boot -D --directory -F --field
-o --output -u --unit --user-unit'
[ARGUNKNOWN]='-c --cursor --interval -n --lines -p --priority --since --until
diff --git a/shell-completion/zsh/_journalctl b/shell-completion/zsh/_journalctl
index 73646b5..29ff3e3 100644
--- a/shell-completion/zsh/_journalctl
+++ b/shell-completion/zsh/_journalctl
@@ -70,6 +70,7 @@ _arguments -s \
{-q,--quiet}"[Don't show privilege warning]" \
{-m,--merge}'[Show entries from all available journals]' \
{-b+,--boot=}'[Show data only from the specified boot or offset]:boot id or offset:_journal_boots' \
+ '--list-boots[List boots ordered by time]' \
{-k,--dmesg}'[Show only kernel messages, Implies -b]' \
{-u+,--unit=}'[Show data only from the specified unit]:units:_journal_fields _SYSTEMD_UNIT' \
'--user-unit=[Show data only from the specified user session unit]:units:_journal_fields USER_UNIT' \
diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 0876ee6..a5c4779 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -104,12 +104,14 @@ static enum {
ACTION_DISK_USAGE,
ACTION_LIST_CATALOG,
ACTION_DUMP_CATALOG,
- ACTION_UPDATE_CATALOG
+ ACTION_UPDATE_CATALOG,
+ ACTION_LIST_BOOTS,
} arg_action = ACTION_SHOW;
typedef struct boot_id_t {
sd_id128_t id;
- uint64_t timestamp;
+ uint64_t first;
+ uint64_t last;
} boot_id_t;
static int help(void) {
@@ -125,6 +127,7 @@ static int help(void) {
" --after-cursor=CURSOR Start showing entries from specified cursor\n"
" --show-cursor Print the cursor after all the entries\n"
" -b --boot[=ID] Show data only from ID or current boot if unspecified\n"
+ " --list-boots Show terse information about recorded boots\n"
" -k --dmesg Show kernel message log from current boot\n"
" -u --unit=UNIT Show data only from the specified unit\n"
" --user-unit=UNIT Show data only from the specified user session unit\n"
@@ -177,6 +180,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_NO_PAGER,
ARG_NO_TAIL,
ARG_NEW_ID128,
+ ARG_LIST_BOOTS,
ARG_USER,
ARG_SYSTEM,
ARG_ROOT,
@@ -214,6 +218,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "quiet", no_argument, NULL, 'q' },
{ "merge", no_argument, NULL, 'm' },
{ "boot", optional_argument, NULL, 'b' },
+ { "list-boots", no_argument, NULL, ARG_LIST_BOOTS },
{ "this-boot", optional_argument, NULL, 'b' }, /* deprecated */
{ "dmesg", no_argument, NULL, 'k' },
{ "system", no_argument, NULL, ARG_SYSTEM },
@@ -364,6 +369,10 @@ static int parse_argv(int argc, char *argv[]) {
break;
+ case ARG_LIST_BOOTS:
+ arg_action = ACTION_LIST_BOOTS;
+ break;
+
case 'k':
arg_boot = arg_dmesg = true;
break;
@@ -692,12 +701,93 @@ static int add_matches(sd_journal *j, char **args) {
static int boot_id_cmp(const void *a, const void *b) {
uint64_t _a, _b;
- _a = ((const boot_id_t *)a)->timestamp;
- _b = ((const boot_id_t *)b)->timestamp;
+ _a = ((const boot_id_t *)a)->first;
+ _b = ((const boot_id_t *)b)->first;
return _a < _b ? -1 : (_a > _b ? 1 : 0);
}
+static int list_boots(sd_journal *j) {
+ int r;
+ const void *data;
+ unsigned int count = 0;
+ int w, i;
+ size_t length, allocated = 0;
+ boot_id_t *id;
+ _cleanup_free_ boot_id_t *all_ids = NULL;
+
+ r = sd_journal_query_unique(j, "_BOOT_ID");
+ if (r < 0)
+ return r;
+
+ SD_JOURNAL_FOREACH_UNIQUE(j, data, length) {
+ if (length < strlen("_BOOT_ID="))
+ continue;
+
+ if (!GREEDY_REALLOC(all_ids, allocated, count + 1))
+ return log_oom();
+
+ id = &all_ids[count];
+
+ r = sd_id128_from_string(((const char *)data) + strlen("_BOOT_ID="), &id->id);
+ if (r < 0)
+ continue;
+
+ r = sd_journal_add_match(j, data, length);
+ if (r < 0)
+ return r;
+
+ r = sd_journal_seek_head(j);
+ if (r < 0)
+ return r;
+
+ r = sd_journal_next(j);
+ if (r < 0)
+ return r;
+ else if (r == 0)
+ goto flush;
+
+ r = sd_journal_get_realtime_usec(j, &id->first);
+ if (r < 0)
+ return r;
+
+ r = sd_journal_seek_tail(j);
+ if (r < 0)
+ return r;
+
+ r = sd_journal_previous(j);
+ if (r < 0)
+ return r;
+ else if (r == 0)
+ goto flush;
+
+ r = sd_journal_get_realtime_usec(j, &id->last);
+ if (r < 0)
+ return r;
+
+ count++;
+ flush:
+ sd_journal_flush_matches(j);
+ }
+
+ qsort_safe(all_ids, count, sizeof(boot_id_t), boot_id_cmp);
+
+ /* numbers are one less, but we need an extra char for the sign */
+ w = DECIMAL_STR_WIDTH(count - 1) + 1;
+
+ for (id = all_ids, i = 0; id < all_ids + count; id++, i++) {
+ char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
+
+ printf("% *i " SD_ID128_FORMAT_STR " %s—%s\n",
+ w, i - count + 1,
+ SD_ID128_FORMAT_VAL(id->id),
+ format_timestamp(a, sizeof(a), id->first),
+ format_timestamp(b, sizeof(b), id->last));
+ }
+
+ return 0;
+}
+
static int get_relative_boot_id(sd_journal *j, sd_id128_t *boot_id, int relative) {
int r;
const void *data;
@@ -743,7 +833,7 @@ static int get_relative_boot_id(sd_journal *j, sd_id128_t *boot_id, int relative
else if (r == 0)
goto flush;
- r = sd_journal_get_realtime_usec(j, &id->timestamp);
+ r = sd_journal_get_realtime_usec(j, &id->first);
if (r < 0)
return r;
@@ -1403,6 +1493,11 @@ int main(int argc, char *argv[]) {
return EXIT_SUCCESS;
}
+ if (arg_action == ACTION_LIST_BOOTS) {
+ r = list_boots(j);
+ goto finish;
+ }
+
/* add_boot() must be called first!
* It may need to seek the journal to find parent boot IDs. */
r = add_boot(j);
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