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journalctl: add new --fields switch to dump all currently used field names

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Fixes #2176
This commit is contained in:
Lennart Poettering 2016-01-27 19:01:42 +01:00
parent eb86030ec0
commit 69e714f3d8
2 changed files with 35 additions and 2 deletions
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7
man/journalctl.xml
View file

@ -571,6 +571,13 @@
field can take in all entries of the journal.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-N</option></term>
<term><option>--fields</option></term>
<listitem><para>Print all field names currently used in all entries of the journal.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--system</option></term>
<term><option>--user</option></term>

30
src/journal/journalctl.c
View file

@ -136,6 +136,8 @@ static enum {
ACTION_SYNC,
ACTION_ROTATE,
ACTION_VACUUM,
ACTION_LIST_FIELDS,
ACTION_LIST_FIELD_NAMES,
} arg_action = ACTION_SHOW;
typedef struct BootId {
@ -244,6 +246,7 @@ static void help(void) {
"\nCommands:\n"
" -h --help Show this help text\n"
" --version Show package version\n"
" -N --fields List all field names currently used\n"
" -F --field=FIELD List all values that a specified field takes\n"
" --disk-usage Show total disk usage of all journal files\n"
" --vacuum-size=BYTES Reduce disk usage below specified size\n"
@ -340,6 +343,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "unit", required_argument, NULL, 'u' },
{ "user-unit", required_argument, NULL, ARG_USER_UNIT },
{ "field", required_argument, NULL, 'F' },
{ "fields", no_argument, NULL, 'N' },
{ "catalog", no_argument, NULL, 'x' },
{ "list-catalog", no_argument, NULL, ARG_LIST_CATALOG },
{ "dump-catalog", no_argument, NULL, ARG_DUMP_CATALOG },
@ -361,7 +365,7 @@ static int parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hefo:aln::qmb::kD:p:c:S:U:t:u:F:xrM:", options, NULL)) >= 0)
while ((c = getopt_long(argc, argv, "hefo:aln::qmb::kD:p:c:S:U:t:u:NF:xrM:", options, NULL)) >= 0)
switch (c) {
@ -698,9 +702,14 @@ static int parse_argv(int argc, char *argv[]) {
break;
case 'F':
arg_action = ACTION_LIST_FIELDS;
arg_field = optarg;
break;
case 'N':
arg_action = ACTION_LIST_FIELD_NAMES;
break;
case 'x':
arg_catalog = true;
break;
@ -2003,6 +2012,8 @@ int main(int argc, char *argv[]) {
case ACTION_DISK_USAGE:
case ACTION_LIST_BOOTS:
case ACTION_VACUUM:
case ACTION_LIST_FIELDS:
case ACTION_LIST_FIELD_NAMES:
/* These ones require access to the journal files, continue below. */
break;
@ -2085,7 +2096,20 @@ int main(int argc, char *argv[]) {
goto finish;
}
case ACTION_LIST_FIELD_NAMES: {
const char *field;
SD_JOURNAL_FOREACH_FIELD(j, field) {
printf("%s\n", field);
n_shown ++;
}
r = 0;
goto finish;
}
case ACTION_SHOW:
case ACTION_LIST_FIELDS:
break;
default:
@ -2139,10 +2163,12 @@ int main(int argc, char *argv[]) {
log_debug("Journal filter: %s", filter);
}
if (arg_field) {
if (arg_action == ACTION_LIST_FIELDS) {
const void *data;
size_t size;
assert(arg_field);
r = sd_journal_set_data_threshold(j, 0);
if (r < 0) {
log_error_errno(r, "Failed to unset data size threshold: %m");