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journalctl: add --list-boots to show boot IDs and times

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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.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2013-10-28 23:43:57 -04:00
parent c20fd707a2
commit f11880744c
4 changed files with 113 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
man/journalctl.xml
View File

@ -486,6 +486,17 @@
</listitem>
</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>

2
shell-completion/bash/journalctl
View File

@ -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

1
shell-completion/zsh/_journalctl
View File

@ -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' \

105
src/journal/journalctl.c
View File

@ -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"
@ -178,6 +181,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_NO_FULL,
ARG_NO_TAIL,
ARG_NEW_ID128,
ARG_LIST_BOOTS,
ARG_USER,
ARG_SYSTEM,
ARG_ROOT,
@ -216,6 +220,7 @@ 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 },
@ -370,6 +375,10 @@ 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;
@ -698,12 +707,93 @@ 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;
@ -749,7 +839,7 @@ 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;
@ -1409,6 +1499,11 @@ 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);