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journalctl: Unify boot id lookup into common function get_boots

This commit is contained in:
Jan Janssen 2014-10-23 19:37:29 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent 2ec62d8e84
commit ea7061e4d4
1 changed files with 59 additions and 75 deletions
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134
src/journal/journalctl.c
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@ -844,28 +844,32 @@ static int boot_id_cmp(const void *a, const void *b) {
return _a < _b ? -1 : (_a > _b ? 1 : 0);
}
static int list_boots(sd_journal *j) {
static int get_boots(sd_journal *j,
boot_id_t **boots,
unsigned int *count,
boot_id_t *query_ref_boot) {
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;
assert(j);
assert(boots);
assert(count);
r = sd_journal_query_unique(j, "_BOOT_ID");
if (r < 0)
return r;
pager_open_if_enabled();
*count = 0;
SD_JOURNAL_FOREACH_UNIQUE(j, data, length) {
boot_id_t *id;
assert(startswith(data, "_BOOT_ID="));
if (!GREEDY_REALLOC(all_ids, allocated, count + 1))
if (!GREEDY_REALLOC(*boots, allocated, *count + 1))
return log_oom();
id = &all_ids[count];
id = *boots + *count;
r = sd_id128_from_string(((const char *)data) + strlen("_BOOT_ID="), &id->id);
if (r < 0)
@ -889,26 +893,48 @@ static int list_boots(sd_journal *j) {
if (r < 0)
return r;
r = sd_journal_seek_tail(j);
if (r < 0)
return r;
if (query_ref_boot) {
id->last = 0;
if (sd_id128_equal(id->id, query_ref_boot->id))
*query_ref_boot = *id;
} else {
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_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;
r = sd_journal_get_realtime_usec(j, &id->last);
if (r < 0)
return r;
}
count++;
(*count)++;
flush:
sd_journal_flush_matches(j);
}
qsort_safe(all_ids, count, sizeof(boot_id_t), boot_id_cmp);
qsort_safe(*boots, *count, sizeof(boot_id_t), boot_id_cmp);
return 0;
}
static int list_boots(sd_journal *j) {
int r, w, i;
unsigned int count;
boot_id_t *id;
_cleanup_free_ boot_id_t *all_ids = NULL;
assert(j);
r = get_boots(j, &all_ids, &count, NULL);
if (r < 0)
return r;
pager_open_if_enabled();
/* numbers are one less, but we need an extra char for the sign */
w = DECIMAL_STR_WIDTH(count - 1) + 1;
@ -926,76 +952,34 @@ static int list_boots(sd_journal *j) {
return 0;
}
static int get_relative_boot_id(sd_journal *j, sd_id128_t *boot_id, int relative) {
static int get_boot_id_by_offset(sd_journal *j, sd_id128_t *boot_id, int offset) {
int r;
const void *data;
unsigned int count = 0;
size_t length, allocated = 0;
boot_id_t ref_boot_id = {SD_ID128_NULL}, *id;
unsigned int count;
boot_id_t ref_boot_id = {}, *id;
_cleanup_free_ boot_id_t *all_ids = NULL;
assert(j);
assert(boot_id);
r = sd_journal_query_unique(j, "_BOOT_ID");
ref_boot_id.id = *boot_id;
r = get_boots(j, &all_ids, &count, &ref_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;
if (sd_id128_equal(id->id, *boot_id))
ref_boot_id = *id;
count++;
flush:
sd_journal_flush_matches(j);
}
qsort_safe(all_ids, count, sizeof(boot_id_t), boot_id_cmp);
if (sd_id128_equal(*boot_id, SD_ID128_NULL)) {
if (relative > (int) count || relative <= -(int)count)
if (offset > (int) count || offset <= -(int)count)
return -EADDRNOTAVAIL;
*boot_id = all_ids[(relative <= 0)*count + relative - 1].id;
*boot_id = all_ids[(offset <= 0)*count + offset - 1].id;
} else {
id = bsearch(&ref_boot_id, all_ids, count, sizeof(boot_id_t), boot_id_cmp);
if (!id ||
relative <= 0 ? (id - all_ids) + relative < 0 :
(id - all_ids) + relative >= (int) count)
offset <= 0 ? (id - all_ids) + offset < 0 :
(id - all_ids) + offset >= (int) count)
return -EADDRNOTAVAIL;
*boot_id = (id + relative)->id;
*boot_id = (id + offset)->id;
}
return 0;
@ -1013,7 +997,7 @@ static int add_boot(sd_journal *j) {
if (arg_boot_offset == 0 && sd_id128_equal(arg_boot_id, SD_ID128_NULL))
return add_match_this_boot(j, arg_machine);
r = get_relative_boot_id(j, &arg_boot_id, arg_boot_offset);
r = get_boot_id_by_offset(j, &arg_boot_id, arg_boot_offset);
if (r < 0) {
if (sd_id128_equal(arg_boot_id, SD_ID128_NULL))
log_error("Failed to look up boot %+i: %s", arg_boot_offset, strerror(-r));