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journalctl: add --reverse option to show the newest lines first

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This commit is contained in:
Lukas Nykryn 2013-03-01 10:27:10 +01:00 committed by Lennart Poettering
parent 37d3ab1b7e
commit d89d6c86d9
2 changed files with 60 additions and 6 deletions
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8
man/journalctl.xml
View File

@ -184,6 +184,14 @@
<option>--lines=</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-r</option></term>
<term><option>--reverse</option></term>
<listitem><para>Reverse output, so the newest
entries are displayed first.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-o</option></term>
<term><option>--output=</option></term>

58
src/journal/journalctl.c
View File

@ -77,6 +77,7 @@ static bool arg_since_set = false, arg_until_set = false;
static const char *arg_unit = NULL;
static const char *arg_field = NULL;
static bool arg_catalog = false;
static bool arg_reverse = false;
static enum {
ACTION_SHOW,
@ -103,6 +104,7 @@ static int help(void) {
" -f --follow Follow 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-monotonic,\n"
" verbose, export, json, json-pretty, json-sse, cat)\n"
" -x --catalog Add message explanations where available\n"
@ -184,6 +186,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "catalog", no_argument, NULL, 'x' },
{ "list-catalog", no_argument, NULL, ARG_LIST_CATALOG },
{ "update-catalog",no_argument, NULL, ARG_UPDATE_CATALOG },
{ "reverse", no_argument, NULL, 'r' },
{ NULL, 0, NULL, 0 }
};
@ -192,7 +195,7 @@ static int parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hfo:an::qmbD:p:c:u:F:x", options, NULL)) >= 0) {
while ((c = getopt_long(argc, argv, "hfo:an::qmbD:p:c:u:F:xr", options, NULL)) >= 0) {
switch (c) {
@ -424,6 +427,10 @@ static int parse_argv(int argc, char *argv[]) {
arg_action = ACTION_UPDATE_CATALOG;
break;
case 'r':
arg_reverse = true;
break;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
@ -443,6 +450,11 @@ static int parse_argv(int argc, char *argv[]) {
return -EINVAL;
}
if (arg_follow && arg_reverse) {
log_error("Please specify either --reverse= or --follow=, not both.");
return -EINVAL;
}
return 1;
}
@ -997,10 +1009,12 @@ int main(int argc, char *argv[]) {
log_error("Failed to seek to cursor: %s", strerror(-r));
goto finish;
}
if (!arg_reverse)
r = sd_journal_next(j);
else
r = sd_journal_previous(j);
r = sd_journal_next(j);
} else if (arg_since_set) {
} else if (arg_since_set && !arg_reverse) {
r = sd_journal_seek_realtime_usec(j, arg_since);
if (r < 0) {
log_error("Failed to seek to date: %s", strerror(-r));
@ -1008,6 +1022,14 @@ int main(int argc, char *argv[]) {
}
r = sd_journal_next(j);
} else if (arg_until_set && arg_reverse) {
r = sd_journal_seek_realtime_usec(j, arg_until);
if (r < 0) {
log_error("Failed to seek to date: %s", strerror(-r));
goto finish;
}
r = sd_journal_previous(j);
} else if (arg_lines >= 0) {
r = sd_journal_seek_tail(j);
if (r < 0) {
@ -1017,6 +1039,15 @@ int main(int argc, char *argv[]) {
r = sd_journal_previous_skip(j, arg_lines);
} else if (arg_reverse) {
r = sd_journal_seek_tail(j);
if (r < 0) {
log_error("Failed to seek to tail: %s", strerror(-r));
goto finish;
}
r = sd_journal_previous(j);
} else {
r = sd_journal_seek_head(j);
if (r < 0) {
@ -1061,7 +1092,10 @@ int main(int argc, char *argv[]) {
int flags;
if (need_seek) {
r = sd_journal_next(j);
if(!arg_reverse)
r = sd_journal_next(j);
else
r = sd_journal_previous(j);
if (r < 0) {
log_error("Failed to iterate through journal: %s", strerror(-r));
goto finish;
@ -1071,7 +1105,7 @@ int main(int argc, char *argv[]) {
if (r == 0)
break;
if (arg_until_set) {
if (arg_until_set && !arg_reverse) {
usec_t usec;
r = sd_journal_get_realtime_usec(j, &usec);
@ -1083,6 +1117,18 @@ int main(int argc, char *argv[]) {
goto finish;
}
if (arg_since_set && arg_reverse) {
usec_t usec;
r = sd_journal_get_realtime_usec(j, &usec);
if (r < 0) {
log_error("Failed to determine timestamp: %s", strerror(-r));
goto finish;
}
if (usec < arg_since)
goto finish;
}
if (!arg_merge) {
sd_id128_t boot_id;