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-rw-r--r--man/journalctl.xml74
-rw-r--r--src/journal/journalctl.c164
2 files changed, 121 insertions, 117 deletions
diff --git a/man/journalctl.xml b/man/journalctl.xml
index 3e03c45f13..65a59ea4e7 100644
--- a/man/journalctl.xml
+++ b/man/journalctl.xml
@@ -399,42 +399,50 @@
</varlistentry>
<varlistentry>
- <term><option>-b <optional><replaceable>ID</replaceable></optional></option></term>
- <term><option>--boot=<optional><replaceable>ID</replaceable></optional></option></term>
+ <term><option>-b <optional><replaceable>ID</replaceable></optional><optional><replaceable>±offset</replaceable></optional></option></term>
+ <term><option>--boot=<optional><replaceable>ID</replaceable></optional><optional><replaceable>±offset</replaceable></optional></option></term>
- <listitem><para>Show messages from the specified
- boot <replaceable>ID</replaceable> or from
- current boot if no <replaceable>ID</replaceable>
- is given. This will add a match for
+ <listitem><para>Show messages from a specific
+ boot. This will add a match for
<literal>_BOOT_ID=</literal>.</para>
- <para>The argument is a 128 bit ID given in
- short or UUID form and optionally followed by
- <literal>:n</literal> which identifies the nth
- boot relative to the boot ID given to the left
- of <literal>:</literal>. Supplying a negative
- value for n will look for a past boot and a
- positive value for a future boot. The boot IDs
- are searched for in chronological order. If no
- number is provided after <literal>:</literal>,
- <literal>-1</literal> is assumed. A value of 0
- is valid and equivalent to omitting
- <literal>:0</literal>.</para>
-
- <para>Alternatively, the argument may constist
- only of <literal>:n</literal>. In this case, a
- positive value will look up the nth boot
- starting from the beginning of the jouranl, a
- negative value will look up a previous boot
- relative to the current boot. <literal>:0</literal>
- will look for the current boot ID. Thus,
- <literal>:1</literal> is the first boot found in
- the journal, <literal>:2</literal> the second
- and so on; while <literal>:-1</literal> is the
- previous boot, <literal>:-2</literal> the boot
- before that and so on. Omitting a value after
- <literal>:</literal> will look for the previous
- boot.</para></listitem>
+ <para>The argument may be empty, in which case
+ logs for the current boot will be shown.</para>
+
+ <para>If the boot ID is omitted, a positive
+ <replaceable>offset</replaceable> will look up
+ the boots starting from the beginning of the
+ journal, and a equal-or-less-than zero
+ <replaceable>offset</replaceable> will look up
+ boots starting from the end of the
+ journal. Thus, <constant>1</constant> means the
+ first boot found in the journal in the
+ chronological order, <constant>2</constant> the
+ second and so on; while <constant>-0</constant>
+ is the last boot, <constant>-1</constant> the
+ boot before that, and so on. An empty
+ <replaceable>offset</replaceable> is equivalent
+ to specifying <constant>-0</constant>, except
+ when the current boot is not the last boot
+ (e.g. because <option>--directory</option> was
+ specified to look at logs from a different
+ machine).</para>
+
+ <para>If the 32 character
+ <replaceable>ID</replaceable> is specified, it
+ may optionally be followed by
+ <replaceable>offset</replaceable> which
+ identifies the boot relative to the one given by
+ boot <replaceable>ID</replaceable>. Negative
+ values mean earlier boots and a positive values
+ mean later boots. If
+ <replaceable>offset</replaceable> is not
+ specified, a value of zero is assumed and the
+ logs for the boot given by
+ <replaceable>ID</replaceable> are shown.
+ </para>
+
+ </listitem>
</varlistentry>
<varlistentry>
diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 7099706696..9a40d69a75 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -70,8 +70,8 @@ static int arg_lines = -1;
static bool arg_no_tail = false;
static bool arg_quiet = false;
static bool arg_merge = false;
-static bool arg_boot_id = false;
-static char *arg_boot_id_descriptor = NULL;
+static bool arg_boot = false;
+static char *arg_boot_descriptor = NULL;
static bool arg_dmesg = false;
static const char *arg_cursor = NULL;
static const char *arg_after_cursor = NULL;
@@ -346,17 +346,24 @@ static int parse_argv(int argc, char *argv[]) {
break;
case 'b':
+ arg_boot = true;
+
if (optarg)
- arg_boot_id_descriptor = optarg;
- else if (optind < argc && argv[optind][0] != '-') {
- arg_boot_id_descriptor = argv[optind];
- optind++;
+ arg_boot_descriptor = optarg;
+ else if (optind < argc) {
+ int boot;
+
+ if (argv[optind][0] != '-' ||
+ safe_atoi(argv[optind], &boot) >= 0) {
+ arg_boot_descriptor = argv[optind];
+ optind++;
+ }
}
- arg_boot_id = true;
+
break;
case 'k':
- arg_boot_id = arg_dmesg = true;
+ arg_boot = arg_dmesg = true;
break;
case ARG_SYSTEM:
@@ -671,23 +678,17 @@ static int boot_id_cmp(const void *a, const void *b) {
static int get_relative_boot_id(sd_journal *j, sd_id128_t *boot_id, int relative) {
int r;
const void *data;
- unsigned int id_count = 0;
+ unsigned int count = 0;
size_t length, allocated = 0;
- boot_id_t ref_boot_id, *id;
+ boot_id_t ref_boot_id = {SD_ID128_NULL}, *id;
_cleanup_free_ boot_id_t *all_ids = NULL;
- bool find_first_boot = false, ref_boot_found = false;
assert(j);
assert(boot_id);
- if (relative == 0)
+ if (relative == 0 && !sd_id128_equal(*boot_id, SD_ID128_NULL))
return 0;
- if (sd_id128_equal(*boot_id, SD_ID128_NULL) && relative > 0) {
- find_first_boot = true;
- relative--;
- }
-
r = sd_journal_query_unique(j, "_BOOT_ID");
if (r < 0)
return r;
@@ -696,123 +697,118 @@ static int get_relative_boot_id(sd_journal *j, sd_id128_t *boot_id, int relative
if (length < strlen("_BOOT_ID="))
continue;
- if (!GREEDY_REALLOC(all_ids, allocated, id_count + 1))
+ if (!GREEDY_REALLOC(all_ids, allocated, count + 1))
return log_oom();
- id = &all_ids[id_count];
+ id = &all_ids[count];
r = sd_id128_from_string(((const char *)data) + strlen("_BOOT_ID="), &id->id);
- if (r < 0) {
+ if (r < 0)
continue;
- }
- sd_journal_flush_matches(j);
r = sd_journal_add_match(j, data, length);
if (r < 0)
- continue;
+ return r;
r = sd_journal_seek_head(j);
if (r < 0)
- continue;
+ return r;
r = sd_journal_next(j);
- if (r <= 0)
- continue;
+ if (r < 0)
+ return r;
+ else if (r == 0)
+ goto flush;
r = sd_journal_get_realtime_usec(j, &id->timestamp);
if (r < 0)
- continue;
+ return r;
- if (!find_first_boot && sd_id128_equal(id->id, *boot_id)) {
+ if (sd_id128_equal(id->id, *boot_id))
ref_boot_id = *id;
- ref_boot_found = true;
- }
- id_count++;
+ count++;
+ flush:
+ sd_journal_flush_matches(j);
}
- *boot_id = SD_ID128_NULL;
- sd_journal_flush_matches(j);
+ qsort(all_ids, count, sizeof(boot_id_t), boot_id_cmp);
- if (id_count == 0 || (!find_first_boot && !ref_boot_found))
- return 0;
+ if (sd_id128_equal(*boot_id, SD_ID128_NULL)) {
+ if (relative > (int) count || relative <= -(int)count)
+ return -EADDRNOTAVAIL;
- qsort(all_ids, id_count, sizeof(boot_id_t), boot_id_cmp);
- if (find_first_boot)
- id = all_ids;
- else
- id = bsearch(&ref_boot_id, all_ids, id_count, sizeof(boot_id_t), boot_id_cmp);
+ *boot_id = all_ids[(relative <= 0)*count + relative - 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) ||
- (relative >= 0 && (unsigned long)((id - all_ids) + relative) >= id_count))
- return 0;
+ if (!id ||
+ relative <= 0 ? (id - all_ids) + relative < 0 :
+ (id - all_ids) + relative >= count)
+ return -EADDRNOTAVAIL;
+
+ *boot_id = (id + relative)->id;
+ }
- id += relative;
- *boot_id = id->id;
return 0;
}
static int add_boot(sd_journal *j) {
char match[9+32+1] = "_BOOT_ID=";
- char *marker;
- sd_id128_t boot_id;
+ char *offset;
+ sd_id128_t boot_id = SD_ID128_NULL;
int r, relative = 0;
assert(j);
- if (!arg_boot_id)
+ if (!arg_boot)
return 0;
- if (arg_boot_id_descriptor) {
- marker = strchr(arg_boot_id_descriptor, ':');
- if (marker) {
- *marker = '\0';
- marker++;
+ if (!arg_boot_descriptor)
+ return add_match_this_boot(j);
- if (*marker == '\0')
- relative = -1;
- else {
- r = safe_atoi(marker, &relative);
- if (r < 0) {
- log_error("Failed to parse relative boot ID number '%s'", marker);
- return -EINVAL;
- }
- }
+ if (strlen(arg_boot_descriptor) >= 32) {
+ char tmp = arg_boot_descriptor[32];
+ arg_boot_descriptor[32] = '\0';
+ r = sd_id128_from_string(arg_boot_descriptor, &boot_id);
+ arg_boot_descriptor[32] = tmp;
+
+ if (r < 0) {
+ log_error("Failed to parse boot ID '%.32s': %s",
+ arg_boot_descriptor, strerror(-r));
+ return r;
}
- }
- if (isempty(arg_boot_id_descriptor)) {
- if (relative > 0) {
- /* We cannot look into the future. Instead, we look
- * into the past (starting from first boot). The ID
- * will be looked up later */
- boot_id = SD_ID128_NULL;
- } else {
- r = sd_id128_get_boot(&boot_id);
- if (r < 0) {
- log_error("Failed to get boot ID: %s", strerror(-r));
- return r;
- }
+ offset = arg_boot_descriptor + 32;
+
+ if (*offset != '-' && *offset != '+') {
+ log_error("Relative boot ID offset must start with a '+' or a '-', found '%s' ", offset);
+ return -EINVAL;
}
- } else {
- r = sd_id128_from_string(arg_boot_id_descriptor, &boot_id);
+ } else
+ offset = arg_boot_descriptor;
+
+ if (*offset) {
+ r = safe_atoi(offset, &relative);
if (r < 0) {
- log_error("Failed to parse boot ID: %s", strerror(-r));
- return r;
+ log_error("Failed to parse relative boot ID number '%s'", offset);
+ return -EINVAL;
}
}
r = get_relative_boot_id(j, &boot_id, relative);
if (r < 0) {
- log_error("Failed to look up boot ID: %s", strerror(-r));
+ if (sd_id128_equal(boot_id, SD_ID128_NULL))
+ log_error("Failed to look up boot %+d: %s", relative, strerror(-r));
+ else
+ log_error("Failed to look up boot ID "SD_ID128_FORMAT_STR"%+d: %s",
+ SD_ID128_FORMAT_VAL(boot_id), relative, strerror(-r));
return r;
- } else if (sd_id128_equal(boot_id, SD_ID128_NULL)) {
- log_error("Failed to find boot ID");
- return -1;
}
sd_id128_to_string(boot_id, match + 9);
- r = sd_journal_add_match(j, match, strlen(match));
+
+ r = sd_journal_add_match(j, match, sizeof(match) - 1);
if (r < 0) {
log_error("Failed to add match: %s", strerror(-r));
return r;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-10 16:47:39 +0000