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journalctl.c
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journalctl.c
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <locale.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <errno.h>
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <getopt.h>
#include <signal.h>
#include <poll.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/inotify.h>
#include <linux/fs.h>
#ifdef HAVE_ACL
#include <sys/acl.h>
#include "acl-util.h"
#endif
#include "sd-journal.h"
#include "sd-bus.h"
#include "log.h"
#include "logs-show.h"
#include "util.h"
#include "path-util.h"
#include "fileio.h"
#include "build.h"
#include "pager.h"
#include "strv.h"
#include "set.h"
#include "sigbus.h"
#include "journal-internal.h"
#include "journal-def.h"
#include "journal-verify.h"
#include "journal-authenticate.h"
#include "journal-qrcode.h"
#include "journal-vacuum.h"
#include "fsprg.h"
#include "unit-name.h"
#include "catalog.h"
#include "mkdir.h"
#include "bus-util.h"
#include "bus-error.h"
#define DEFAULT_FSS_INTERVAL_USEC (15*USEC_PER_MINUTE)
enum {
/* Special values for arg_lines */
ARG_LINES_DEFAULT = -2,
ARG_LINES_ALL = -1,
};
static OutputMode arg_output = OUTPUT_SHORT;
static bool arg_utc = false;
static bool arg_pager_end = false;
static bool arg_follow = false;
static bool arg_full = true;
static bool arg_all = false;
static bool arg_no_pager = false;
static int arg_lines = ARG_LINES_DEFAULT;
static bool arg_no_tail = false;
static bool arg_quiet = false;
static bool arg_merge = false;
static bool arg_boot = false;
static sd_id128_t arg_boot_id = {};
static int arg_boot_offset = 0;
static bool arg_dmesg = false;
static const char *arg_cursor = NULL;
static const char *arg_after_cursor = NULL;
static bool arg_show_cursor = false;
static const char *arg_directory = NULL;
static char **arg_file = NULL;
static int arg_priorities = 0xFF;
static const char *arg_verify_key = NULL;
#ifdef HAVE_GCRYPT
static usec_t arg_interval = DEFAULT_FSS_INTERVAL_USEC;
static bool arg_force = false;
#endif
static usec_t arg_since, arg_until;
static bool arg_since_set = false, arg_until_set = false;
static char **arg_syslog_identifier = NULL;
static char **arg_system_units = NULL;
static char **arg_user_units = NULL;
static const char *arg_field = NULL;
static bool arg_catalog = false;
static bool arg_reverse = false;
static int arg_journal_type = 0;
static const char *arg_root = NULL;
static const char *arg_machine = NULL;
static off_t arg_vacuum_size = (off_t) -1;
static usec_t arg_vacuum_time = USEC_INFINITY;
static enum {
ACTION_SHOW,
ACTION_NEW_ID128,
ACTION_PRINT_HEADER,
ACTION_SETUP_KEYS,
ACTION_VERIFY,
ACTION_DISK_USAGE,
ACTION_LIST_CATALOG,
ACTION_DUMP_CATALOG,
ACTION_UPDATE_CATALOG,
ACTION_LIST_BOOTS,
ACTION_FLUSH,
ACTION_VACUUM,
} arg_action = ACTION_SHOW;
typedef struct boot_id_t {
sd_id128_t id;
uint64_t first;
uint64_t last;
} boot_id_t;
static void pager_open_if_enabled(void) {
if (arg_no_pager)
return;
pager_open(arg_pager_end);
}
static char *format_timestamp_maybe_utc(char *buf, size_t l, usec_t t) {
if (arg_utc)
return format_timestamp_utc(buf, l, t);
return format_timestamp(buf, l, t);
}
static int parse_boot_descriptor(const char *x, sd_id128_t *boot_id, int *offset) {
sd_id128_t id = SD_ID128_NULL;
int off = 0, r;
if (strlen(x) >= 32) {
char *t;
t = strndupa(x, 32);
r = sd_id128_from_string(t, &id);
if (r >= 0)
x += 32;
if (*x != '-' && *x != '+' && *x != 0)
return -EINVAL;
if (*x != 0) {
r = safe_atoi(x, &off);
if (r < 0)
return r;
}
} else {
r = safe_atoi(x, &off);
if (r < 0)
return r;
}
if (boot_id)
*boot_id = id;
if (offset)
*offset = off;
return 0;
}
static void help(void) {
pager_open_if_enabled();
printf("%s [OPTIONS...] [MATCHES...]\n\n"
"Query the journal.\n\n"
"Flags:\n"
" --system Show the system journal\n"
" --user Show the user journal for the current user\n"
" -M --machine=CONTAINER Operate on local container\n"
" --since=DATE Start showing entries on or newer than the specified date\n"
" --until=DATE Stop showing entries on or newer than the specified date\n"
" -c --cursor=CURSOR Start showing entries from the specified cursor\n"
" --after-cursor=CURSOR Start showing entries from after the specified cursor\n"
" --show-cursor Print the cursor after all the entries\n"
" -b --boot[=ID] Show data only from ID or, if unspecified, the current boot\n"
" --list-boots Show terse information about recorded boots\n"
" -k --dmesg Show kernel message log from the 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"
" -t --identifier=STRING Show only messages with the specified syslog identifier\n"
" -p --priority=RANGE Show only messages within the specified priority range\n"
" -e --pager-end Immediately jump to end of the journal in the pager\n"
" -f --follow Follow the journal\n"
" -n --lines[=INTEGER] Number of journal entries to show\n"
" --no-tail Show all lines, even in follow mode\n"
" -r --reverse Show the newest entries first\n"
" -o --output=STRING Change journal output mode (short, short-iso,\n"
" short-precise, short-monotonic, verbose,\n"
" export, json, json-pretty, json-sse, cat)\n"
" --utc Express time in Coordinated Universal Time (UTC)\n"
" -x --catalog Add message explanations where available\n"
" --no-full Ellipsize fields\n"
" -a --all Show all fields, including long and unprintable\n"
" -q --quiet Do not show privilege warning\n"
" --no-pager Do not pipe output into a pager\n"
" -m --merge Show entries from all available journals\n"
" -D --directory=PATH Show journal files from directory\n"
" --file=PATH Show journal file\n"
" --root=ROOT Operate on catalog files underneath the root ROOT\n"
#ifdef HAVE_GCRYPT
" --interval=TIME Time interval for changing the FSS sealing key\n"
" --verify-key=KEY Specify FSS verification key\n"
" --force Force overriding of the FSS key pair with --setup-keys\n"
#endif
"\nCommands:\n"
" -h --help Show this help text\n"
" --version Show package version\n"
" -F --field=FIELD List all values that a specified field takes\n"
" --new-id128 Generate a new 128-bit ID\n"
" --disk-usage Show total disk usage of all journal files\n"
" --vacuum-size=BYTES Remove old journals until disk space drops below size\n"
" --vacuum-time=TIME Remove old journals until none left older than\n"
" --flush Flush all journal data from /run into /var\n"
" --header Show journal header information\n"
" --list-catalog Show message IDs of all entries in the message catalog\n"
" --dump-catalog Show entries in the message catalog\n"
" --update-catalog Update the message catalog database\n"
#ifdef HAVE_GCRYPT
" --setup-keys Generate a new FSS key pair\n"
" --verify Verify journal file consistency\n"
#endif
, program_invocation_short_name);
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_NO_PAGER,
ARG_NO_FULL,
ARG_NO_TAIL,
ARG_NEW_ID128,
ARG_LIST_BOOTS,
ARG_USER,
ARG_SYSTEM,
ARG_ROOT,
ARG_HEADER,
ARG_SETUP_KEYS,
ARG_FILE,
ARG_INTERVAL,
ARG_VERIFY,
ARG_VERIFY_KEY,
ARG_DISK_USAGE,
ARG_SINCE,
ARG_UNTIL,
ARG_AFTER_CURSOR,
ARG_SHOW_CURSOR,
ARG_USER_UNIT,
ARG_LIST_CATALOG,
ARG_DUMP_CATALOG,
ARG_UPDATE_CATALOG,
ARG_FORCE,
ARG_UTC,
ARG_FLUSH,
ARG_VACUUM_SIZE,
ARG_VACUUM_TIME,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version" , no_argument, NULL, ARG_VERSION },
{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
{ "pager-end", no_argument, NULL, 'e' },
{ "follow", no_argument, NULL, 'f' },
{ "force", no_argument, NULL, ARG_FORCE },
{ "output", required_argument, NULL, 'o' },
{ "all", no_argument, NULL, 'a' },
{ "full", no_argument, NULL, 'l' },
{ "no-full", no_argument, NULL, ARG_NO_FULL },
{ "lines", optional_argument, NULL, 'n' },
{ "no-tail", no_argument, NULL, ARG_NO_TAIL },
{ "new-id128", no_argument, NULL, ARG_NEW_ID128 },
{ "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 },
{ "user", no_argument, NULL, ARG_USER },
{ "directory", required_argument, NULL, 'D' },
{ "file", required_argument, NULL, ARG_FILE },
{ "root", required_argument, NULL, ARG_ROOT },
{ "header", no_argument, NULL, ARG_HEADER },
{ "identifier", required_argument, NULL, 't' },
{ "priority", required_argument, NULL, 'p' },
{ "setup-keys", no_argument, NULL, ARG_SETUP_KEYS },
{ "interval", required_argument, NULL, ARG_INTERVAL },
{ "verify", no_argument, NULL, ARG_VERIFY },
{ "verify-key", required_argument, NULL, ARG_VERIFY_KEY },
{ "disk-usage", no_argument, NULL, ARG_DISK_USAGE },
{ "cursor", required_argument, NULL, 'c' },
{ "after-cursor", required_argument, NULL, ARG_AFTER_CURSOR },
{ "show-cursor", no_argument, NULL, ARG_SHOW_CURSOR },
{ "since", required_argument, NULL, ARG_SINCE },
{ "until", required_argument, NULL, ARG_UNTIL },
{ "unit", required_argument, NULL, 'u' },
{ "user-unit", required_argument, NULL, ARG_USER_UNIT },
{ "field", required_argument, NULL, 'F' },
{ "catalog", no_argument, NULL, 'x' },
{ "list-catalog", no_argument, NULL, ARG_LIST_CATALOG },
{ "dump-catalog", no_argument, NULL, ARG_DUMP_CATALOG },
{ "update-catalog", no_argument, NULL, ARG_UPDATE_CATALOG },
{ "reverse", no_argument, NULL, 'r' },
{ "machine", required_argument, NULL, 'M' },
{ "utc", no_argument, NULL, ARG_UTC },
{ "flush", no_argument, NULL, ARG_FLUSH },
{ "vacuum-size", required_argument, NULL, ARG_VACUUM_SIZE },
{ "vacuum-time", required_argument, NULL, ARG_VACUUM_TIME },
{}
};
int c, r;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hefo:aln::qmb::kD:p:c:t:u:F:xrM:", options, NULL)) >= 0)
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
puts(PACKAGE_STRING);
puts(SYSTEMD_FEATURES);
return 0;
case ARG_NO_PAGER:
arg_no_pager = true;
break;
case 'e':
arg_pager_end = true;
if (arg_lines == ARG_LINES_DEFAULT)
arg_lines = 1000;
break;
case 'f':
arg_follow = true;
break;
case 'o':
arg_output = output_mode_from_string(optarg);
if (arg_output < 0) {
log_error("Unknown output format '%s'.", optarg);
return -EINVAL;
}
if (arg_output == OUTPUT_EXPORT ||
arg_output == OUTPUT_JSON ||
arg_output == OUTPUT_JSON_PRETTY ||
arg_output == OUTPUT_JSON_SSE ||
arg_output == OUTPUT_CAT)
arg_quiet = true;
break;
case 'l':
arg_full = true;
break;
case ARG_NO_FULL:
arg_full = false;
break;
case 'a':
arg_all = true;
break;
case 'n':
if (optarg) {
if (streq(optarg, "all"))
arg_lines = ARG_LINES_ALL;
else {
r = safe_atoi(optarg, &arg_lines);
if (r < 0 || arg_lines < 0) {
log_error("Failed to parse lines '%s'", optarg);
return -EINVAL;
}
}
} else {
arg_lines = 10;
/* Hmm, no argument? Maybe the next
* word on the command line is
* supposed to be the argument? Let's
* see if there is one, and is
* parsable. */
if (optind < argc) {
int n;
if (streq(argv[optind], "all")) {
arg_lines = ARG_LINES_ALL;
optind++;
} else if (safe_atoi(argv[optind], &n) >= 0 && n >= 0) {
arg_lines = n;
optind++;
}
}
}
break;
case ARG_NO_TAIL:
arg_no_tail = true;
break;
case ARG_NEW_ID128:
arg_action = ACTION_NEW_ID128;
break;
case 'q':
arg_quiet = true;
break;
case 'm':
arg_merge = true;
break;
case 'b':
arg_boot = true;
if (optarg) {
r = parse_boot_descriptor(optarg, &arg_boot_id, &arg_boot_offset);
if (r < 0) {
log_error("Failed to parse boot descriptor '%s'", optarg);
return -EINVAL;
}
} else {
/* Hmm, no argument? Maybe the next
* word on the command line is
* supposed to be the argument? Let's
* see if there is one and is parsable
* as a boot descriptor... */
if (optind < argc &&
parse_boot_descriptor(argv[optind], &arg_boot_id, &arg_boot_offset) >= 0)
optind++;
}
break;
case ARG_LIST_BOOTS:
arg_action = ACTION_LIST_BOOTS;
break;
case 'k':
arg_boot = arg_dmesg = true;
break;
case ARG_SYSTEM:
arg_journal_type |= SD_JOURNAL_SYSTEM;
break;
case ARG_USER:
arg_journal_type |= SD_JOURNAL_CURRENT_USER;
break;
case 'M':
arg_machine = optarg;
break;
case 'D':
arg_directory = optarg;
break;
case ARG_FILE:
r = glob_extend(&arg_file, optarg);
if (r < 0)
return log_error_errno(r, "Failed to add paths: %m");
break;
case ARG_ROOT:
arg_root = optarg;
break;
case 'c':
arg_cursor = optarg;
break;
case ARG_AFTER_CURSOR:
arg_after_cursor = optarg;
break;
case ARG_SHOW_CURSOR:
arg_show_cursor = true;
break;
case ARG_HEADER:
arg_action = ACTION_PRINT_HEADER;
break;
case ARG_VERIFY:
arg_action = ACTION_VERIFY;
break;
case ARG_DISK_USAGE:
arg_action = ACTION_DISK_USAGE;
break;
case ARG_VACUUM_SIZE:
r = parse_size(optarg, 1024, &arg_vacuum_size);
if (r < 0) {
log_error("Failed to parse vacuum size: %s", optarg);
return r;
}
arg_action = ACTION_VACUUM;
break;
case ARG_VACUUM_TIME:
r = parse_sec(optarg, &arg_vacuum_time);
if (r < 0) {
log_error("Failed to parse vacuum time: %s", optarg);
return r;
}
arg_action = ACTION_VACUUM;
break;
#ifdef HAVE_GCRYPT
case ARG_FORCE:
arg_force = true;
break;
case ARG_SETUP_KEYS:
arg_action = ACTION_SETUP_KEYS;
break;
case ARG_VERIFY_KEY:
arg_action = ACTION_VERIFY;
arg_verify_key = optarg;
arg_merge = false;
break;
case ARG_INTERVAL:
r = parse_sec(optarg, &arg_interval);
if (r < 0 || arg_interval <= 0) {
log_error("Failed to parse sealing key change interval: %s", optarg);
return -EINVAL;
}
break;
#else
case ARG_SETUP_KEYS:
case ARG_VERIFY_KEY:
case ARG_INTERVAL:
case ARG_FORCE:
log_error("Forward-secure sealing not available.");
return -ENOTSUP;
#endif
case 'p': {
const char *dots;
dots = strstr(optarg, "..");
if (dots) {
char *a;
int from, to, i;
/* a range */
a = strndup(optarg, dots - optarg);
if (!a)
return log_oom();
from = log_level_from_string(a);
to = log_level_from_string(dots + 2);
free(a);
if (from < 0 || to < 0) {
log_error("Failed to parse log level range %s", optarg);
return -EINVAL;
}
arg_priorities = 0;
if (from < to) {
for (i = from; i <= to; i++)
arg_priorities |= 1 << i;
} else {
for (i = to; i <= from; i++)
arg_priorities |= 1 << i;
}
} else {
int p, i;
p = log_level_from_string(optarg);
if (p < 0) {
log_error("Unknown log level %s", optarg);
return -EINVAL;
}
arg_priorities = 0;
for (i = 0; i <= p; i++)
arg_priorities |= 1 << i;
}
break;
}
case ARG_SINCE:
r = parse_timestamp(optarg, &arg_since);
if (r < 0) {
log_error("Failed to parse timestamp: %s", optarg);
return -EINVAL;
}
arg_since_set = true;
break;
case ARG_UNTIL:
r = parse_timestamp(optarg, &arg_until);
if (r < 0) {
log_error("Failed to parse timestamp: %s", optarg);
return -EINVAL;
}
arg_until_set = true;
break;
case 't':
r = strv_extend(&arg_syslog_identifier, optarg);
if (r < 0)
return log_oom();
break;
case 'u':
r = strv_extend(&arg_system_units, optarg);
if (r < 0)
return log_oom();
break;
case ARG_USER_UNIT:
r = strv_extend(&arg_user_units, optarg);
if (r < 0)
return log_oom();
break;
case 'F':
arg_field = optarg;
break;
case 'x':
arg_catalog = true;
break;
case ARG_LIST_CATALOG:
arg_action = ACTION_LIST_CATALOG;
break;
case ARG_DUMP_CATALOG:
arg_action = ACTION_DUMP_CATALOG;
break;
case ARG_UPDATE_CATALOG:
arg_action = ACTION_UPDATE_CATALOG;
break;
case 'r':
arg_reverse = true;
break;
case ARG_UTC:
arg_utc = true;
break;
case ARG_FLUSH:
arg_action = ACTION_FLUSH;
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
if (arg_follow && !arg_no_tail && !arg_since && arg_lines == ARG_LINES_DEFAULT)
arg_lines = 10;
if (!!arg_directory + !!arg_file + !!arg_machine > 1) {
log_error("Please specify either -D/--directory= or --file= or -M/--machine=, not more than one.");
return -EINVAL;
}
if (arg_since_set && arg_until_set && arg_since > arg_until) {
log_error("--since= must be before --until=.");
return -EINVAL;
}
if (!!arg_cursor + !!arg_after_cursor + !!arg_since_set > 1) {
log_error("Please specify only one of --since=, --cursor=, and --after-cursor.");
return -EINVAL;
}
if (arg_follow && arg_reverse) {
log_error("Please specify either --reverse= or --follow=, not both.");
return -EINVAL;
}
if (arg_action != ACTION_SHOW && optind < argc) {
log_error("Extraneous arguments starting with '%s'", argv[optind]);
return -EINVAL;
}
return 1;
}
static int generate_new_id128(void) {
sd_id128_t id;
int r;
unsigned i;
r = sd_id128_randomize(&id);
if (r < 0)
return log_error_errno(r, "Failed to generate ID: %m");
printf("As string:\n"
SD_ID128_FORMAT_STR "\n\n"
"As UUID:\n"
"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n\n"
"As macro:\n"
"#define MESSAGE_XYZ SD_ID128_MAKE(",
SD_ID128_FORMAT_VAL(id),
SD_ID128_FORMAT_VAL(id));
for (i = 0; i < 16; i++)
printf("%02x%s", id.bytes[i], i != 15 ? "," : "");
fputs(")\n\n", stdout);
printf("As Python constant:\n"
">>> import uuid\n"
">>> MESSAGE_XYZ = uuid.UUID('" SD_ID128_FORMAT_STR "')\n",
SD_ID128_FORMAT_VAL(id));
return 0;
}
static int add_matches(sd_journal *j, char **args) {
char **i;
bool have_term = false;
assert(j);
STRV_FOREACH(i, args) {
int r;
if (streq(*i, "+")) {
if (!have_term)
break;
r = sd_journal_add_disjunction(j);
have_term = false;
} else if (path_is_absolute(*i)) {
_cleanup_free_ char *p, *t = NULL, *t2 = NULL;
const char *path;
_cleanup_free_ char *interpreter = NULL;
struct stat st;
p = canonicalize_file_name(*i);
path = p ? p : *i;
if (stat(path, &st) < 0)
return log_error_errno(errno, "Couldn't stat file: %m");
if (S_ISREG(st.st_mode) && (0111 & st.st_mode)) {
if (executable_is_script(path, &interpreter) > 0) {
_cleanup_free_ char *comm;
comm = strndup(basename(path), 15);
if (!comm)
return log_oom();
t = strappend("_COMM=", comm);
/* Append _EXE only if the interpreter is not a link.
Otherwise, it might be outdated often. */
if (lstat(interpreter, &st) == 0 &&
!S_ISLNK(st.st_mode)) {
t2 = strappend("_EXE=", interpreter);
if (!t2)
return log_oom();
}
} else
t = strappend("_EXE=", path);
} else if (S_ISCHR(st.st_mode)) {
if (asprintf(&t, "_KERNEL_DEVICE=c%u:%u",
major(st.st_rdev),
minor(st.st_rdev)) < 0)
return -ENOMEM;
} else if (S_ISBLK(st.st_mode)) {
if (asprintf(&t, "_KERNEL_DEVICE=b%u:%u",
major(st.st_rdev),
minor(st.st_rdev)) < 0)
return -ENOMEM;
} else {
log_error("File is neither a device node, nor regular file, nor executable: %s", *i);
return -EINVAL;
}
if (!t)
return log_oom();
r = sd_journal_add_match(j, t, 0);
if (t2)
r = sd_journal_add_match(j, t2, 0);
have_term = true;
} else {
r = sd_journal_add_match(j, *i, 0);
have_term = true;
}
if (r < 0)
return log_error_errno(r, "Failed to add match '%s': %m", *i);
}
if (!strv_isempty(args) && !have_term) {
log_error("\"+\" can only be used between terms");
return -EINVAL;
}
return 0;
}
static int boot_id_cmp(const void *a, const void *b) {
uint64_t _a, _b;
_a = ((const boot_id_t *)a)->first;
_b = ((const boot_id_t *)b)->first;
return _a < _b ? -1 : (_a > _b ? 1 : 0);
}
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;
size_t length, allocated = 0;
assert(j);
assert(boots);
assert(count);
r = sd_journal_query_unique(j, "_BOOT_ID");
if (r < 0)
return r;
*count = 0;
SD_JOURNAL_FOREACH_UNIQUE(j, data, length) {
boot_id_t *id;
assert(startswith(data, "_BOOT_ID="));
if (!GREEDY_REALLOC(*boots, allocated, *count + 1))
return log_oom();
id = *boots + *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 (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_get_realtime_usec(j, &id->last);
if (r < 0)
return r;
}
(*count)++;
flush:
sd_journal_flush_matches(j);
}
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;
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_maybe_utc(a, sizeof(a), id->first),
format_timestamp_maybe_utc(b, sizeof(b), id->last));
}
return 0;
}
static int get_boot_id_by_offset(sd_journal *j, sd_id128_t *boot_id, int offset) {
int r;
unsigned int count;
boot_id_t ref_boot_id = {}, *id;
_cleanup_free_ boot_id_t *all_ids = NULL;
assert(j);
assert(boot_id);
ref_boot_id.id = *boot_id;
r = get_boots(j, &all_ids, &count, &ref_boot_id);
if (r < 0)
return r;
if (sd_id128_equal(*boot_id, SD_ID128_NULL)) {
if (offset > (int) count || offset <= -(int)count)
return -EADDRNOTAVAIL;
*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 ||