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journalctl: allow --root argument for journal watching 

It is useful to look at a (possibly inactive) container or other os tree
with --root=/path/to/container. This is similar to specifying
--directory=/path/to/container/var/log/journal --directory=/path/to/container/run/systemd/journal
(if using --directory multiple times was allowed), but doesn't require
as much typing.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2016-08-12 00:34:45 -04:00
parent 16fefe9080
commit 0a1750934f
2 changed files with 10 additions and 6 deletions
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6
man/journalctl.xml
View File

@ -659,10 +659,12 @@
<term><option>--root=<replaceable>ROOT</replaceable></option></term>
<listitem><para>Takes a directory path as an argument. If
specified, journalctl will operate on catalog file hierarchy
specified, journalctl will operate on journal directories and catalog file hierarchy
underneath the specified directory instead of the root
directory (e.g. <option>--update-catalog</option> will create
<filename><replaceable>ROOT</replaceable>/var/lib/systemd/catalog/database</filename>).
<filename><replaceable>ROOT</replaceable>/var/lib/systemd/catalog/database</filename>,
and journal files under <filename><replaceable>ROOT</replaceable>/run/journal</filename>
or <filename><replaceable>ROOT</replaceable>/var/log/journal</filename> will be displayed).
</para></listitem>
</varlistentry>

10
src/journal/journalctl.c
View File

@ -310,7 +310,7 @@ static void help(void) {
" -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 below a root directory\n"
" --root=ROOT Operate on files below a root directory\n"
#ifdef HAVE_GCRYPT
" --interval=TIME Time interval for changing the FSS sealing key\n"
" --verify-key=KEY Specify FSS verification key\n"
@ -848,8 +848,8 @@ static int parse_argv(int argc, char *argv[]) {
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.");
if (!!arg_directory + !!arg_file + !!arg_machine + !!arg_root > 1) {
log_error("Please specify at most one of -D/--directory=, --file=, -M/--machine=, --root.");
return -EINVAL;
}
@ -1267,7 +1267,7 @@ static int add_boot(sd_journal *j) {
* We can do this only when we logs are coming from the current machine,
* so take the slow path if log location is specified. */
if (arg_boot_offset == 0 && sd_id128_is_null(arg_boot_id) &&
!arg_directory && !arg_file)
!arg_directory && !arg_file && !arg_root)
return add_match_this_boot(j, arg_machine);
@ -2161,6 +2161,8 @@ int main(int argc, char *argv[]) {
if (arg_directory)
r = sd_journal_open_directory(&j, arg_directory, arg_journal_type);
else if (arg_root)
r = sd_journal_open_directory(&j, arg_root, arg_journal_type | SD_JOURNAL_OS_ROOT);
else if (arg_file_stdin) {
int ifd = STDIN_FILENO;
r = sd_journal_open_files_fd(&j, &ifd, 1, 0);