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journalctl: implement quering field values with new -F switch 

Example:

        journalctl -F _SYSTEMD_UNIT

will list all units that ever logged to the journal.
This commit is contained in:
Lennart Poettering 2012-10-18 03:33:44 +02:00
parent 3c1668da62
commit 15119c1602
2 changed files with 50 additions and 7 deletions
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10
man/journalctl.xml
View File

@ -349,6 +349,16 @@
time, respectively.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--field=</option></term>
<term><option>-f</option></term>
<listitem><para>Print all possible
data values the specified field can
take in all entries of the
journal.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--directory=</option></term>
<term><option>-D</option></term>

47
src/journal/journalctl.c
View File

@ -88,9 +88,8 @@ static enum {
static int help(void) {
printf("%s [OPTIONS...] [MATCH]\n\n"
"Send control commands to or query the journal.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
"Query the journal.\n\n"
"Flags:\n"
" -c --cursor=CURSOR Start showing entries from specified cursor\n"
" --since=DATE Start showing entries newer or of the specified date\n"
" --until=DATE Stop showing entries older or of the specified date\n"
@ -107,15 +106,20 @@ static int help(void) {
" --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"
"Commands:\n"
#ifdef HAVE_GCRYPT
" --interval=TIME Time interval for changing the FSS sealing key\n"
" --verify-key=KEY Specify FSS verification key\n"
#endif
"\nCommands:\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --new-id128 Generate a new 128 Bit ID\n"
" --header Show journal header information\n"
" --disk-usage Show total disk usage\n"
" -F --field=FIELD List all values a certain field takes\n"
#ifdef HAVE_GCRYPT
" --setup-keys Generate new FSS key pair\n"
" --interval=TIME Time interval for changing the FSS sealing key\n"
" --verify Verify journal file consistency\n"
" --verify-key=KEY Specify FSS verification key\n"
#endif
, program_invocation_short_name);
@ -164,6 +168,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "since", required_argument, NULL, ARG_SINCE },
{ "until", required_argument, NULL, ARG_UNTIL },
{ "unit", required_argument, NULL, 'u' },
{ "field", required_argument, NULL, 'F' },
{ NULL, 0, NULL, 0 }
};
@ -172,7 +177,7 @@ 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:", options, NULL)) >= 0) {
while ((c = getopt_long(argc, argv, "hfo:an::qmbD:p:c:u:F:", options, NULL)) >= 0) {
switch (c) {
@ -369,6 +374,10 @@ static int parse_argv(int argc, char *argv[]) {
case '?':
return -EINVAL;
case 'F':
arg_field = optarg;
break;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
@ -898,6 +907,30 @@ int main(int argc, char *argv[]) {
if (r < 0)
goto finish;
if (arg_field) {
const void *data;
size_t size;
r = sd_journal_query_unique(j, arg_field);
if (r < 0) {
log_error("Failed to query unique data objects: %s", strerror(-r));
goto finish;
}
SD_JOURNAL_FOREACH_UNIQUE(j, data, size) {
const void *eq;
eq = memchr(data, '=', size);
if (eq)
printf("%.*s\n", (int) (size - ((const uint8_t*) eq - (const uint8_t*) data + 1)), (const char*) eq + 1);
else
printf("%.*s\n", (int) size, (const char*) data);
}
r = 0;
goto finish;
}
if (arg_cursor) {
r = sd_journal_seek_cursor(j, arg_cursor);
if (r < 0) {