From 5ec508cc5c13d831c93ce98d84b1d9cedb0117a7 Mon Sep 17 00:00:00 2001
From: Jan Synacek <jsynacek@redhat.com>
Date: Mon, 1 Feb 2016 09:23:58 +0100
Subject: [PATCH] sd-journal: introduce has_runtime_files and
has_persistent_files
Also introduce sd_journal_has_runtime_files() and
sd_journal_has_persistent_files() to the public API. These functions
can be used to easily find out if the open journal files are runtime
and/or persistent.
Cherry-picked from: 39fd5b08a73f144a20202a665bd25cad51d8a90b
Resolves: #1082179
---
Makefile-man.am | 7 +++
man/sd-journal.xml | 8 ++-
man/sd_journal_has_runtime_files.xml | 95 ++++++++++++++++++++++++++++++++++++
src/journal/journal-internal.h | 2 +
src/journal/sd-journal.c | 29 +++++++----
src/systemd/sd-journal.h | 3 ++
6 files changed, 133 insertions(+), 11 deletions(-)
create mode 100644 man/sd_journal_has_runtime_files.xml
diff --git a/Makefile-man.am b/Makefile-man.am
index 497be6612..7ec709c8b 100644
--- a/Makefile-man.am
+++ b/Makefile-man.am
@@ -40,6 +40,7 @@ MANPAGES += \
man/sd_journal_get_fd.3 \
man/sd_journal_get_realtime_usec.3 \
man/sd_journal_get_usage.3 \
+ man/sd_journal_has_runtime_files.3 \
man/sd_journal_next.3 \
man/sd_journal_open.3 \
man/sd_journal_print.3 \
@@ -176,6 +177,7 @@ MANPAGES_ALIAS += \
man/sd_journal_get_events.3 \
man/sd_journal_get_monotonic_usec.3 \
man/sd_journal_get_timeout.3 \
+ man/sd_journal_has_persistent_files.3 \
man/sd_journal_next_skip.3 \
man/sd_journal_open_container.3 \
man/sd_journal_open_directory.3 \
@@ -287,6 +289,7 @@ man/sd_journal_get_data_threshold.3: man/sd_journal_get_data.3
man/sd_journal_get_events.3: man/sd_journal_get_fd.3
man/sd_journal_get_monotonic_usec.3: man/sd_journal_get_realtime_usec.3
man/sd_journal_get_timeout.3: man/sd_journal_get_fd.3
+man/sd_journal_has_persistent_files.3: man/sd_journal_has_runtime_files.3
man/sd_journal_next_skip.3: man/sd_journal_next.3
man/sd_journal_open_container.3: man/sd_journal_open.3
man/sd_journal_open_directory.3: man/sd_journal_open.3
@@ -500,6 +503,9 @@ man/sd_journal_get_monotonic_usec.html: man/sd_journal_get_realtime_usec.html
man/sd_journal_get_timeout.html: man/sd_journal_get_fd.html
$(html-alias)
+man/sd_journal_has_persistent_files.html: man/sd_journal_has_runtime_files.html
+ $(html-alias)
+
man/sd_journal_next_skip.html: man/sd_journal_next.html
$(html-alias)
@@ -1727,6 +1733,7 @@ EXTRA_DIST += \
man/sd_journal_get_fd.xml \
man/sd_journal_get_realtime_usec.xml \
man/sd_journal_get_usage.xml \
+ man/sd_journal_has_runtime_files.xml \
man/sd_journal_next.xml \
man/sd_journal_open.xml \
man/sd_journal_print.xml \
diff --git a/man/sd-journal.xml b/man/sd-journal.xml
index 9b1a52207..a1185d372 100644
--- a/man/sd-journal.xml
+++ b/man/sd-journal.xml
@@ -81,9 +81,11 @@
<citerefentry><refentrytitle>sd_journal_get_cutoff_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_get_cutoff_monotonic_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_get_usage</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_journal_get_catalog</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ <citerefentry><refentrytitle>sd_journal_get_catalog</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_journal_get_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_journal_has_runtime_files</refentrytitle><manvolnum>3</manvolnum></citerefentry>
and
- <citerefentry><refentrytitle>sd_journal_get_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ <citerefentry><refentrytitle>sd_journal_has_persistent_files</refentrytitle><manvolnum>3</manvolnum></citerefentry>
for more information about the functions implemented.</para>
<para>Command line access for submitting entries to the journal is
@@ -116,6 +118,8 @@
<citerefentry><refentrytitle>sd_journal_get_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_query_unique</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_get_catalog</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_journal_has_runtime_files</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_journal_has_persistent_files</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
diff --git a/man/sd_journal_has_runtime_files.xml b/man/sd_journal_has_runtime_files.xml
new file mode 100644
index 000000000..237e64920
--- /dev/null
+++ b/man/sd_journal_has_runtime_files.xml
@@ -0,0 +1,95 @@
+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+ This file is part of systemd.
+
+ Copyright 2016 Jan Synáček
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="sd_journal_has_runtime_files">
+
+ <refentryinfo>
+ <title>sd_journal_has_runtime_files</title>
+ <productname>systemd</productname>
+
+ <authorgroup>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Jan</firstname>
+ <surname>Synáček</surname>
+ <email>jan.synacek@gmail.com</email>
+ </author>
+ </authorgroup>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_journal_has_runtime_files</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_journal_has_runtime_files</refname>
+ <refname>sd_journal_has_persistent_files</refname>
+ <refpurpose>Query availability of runtime or persistent journal files.</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_journal_has_runtime_files</function></funcdef>
+ <paramdef>sd_journal *<parameter>j</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_journal_has_persistent_files</function></funcdef>
+ <paramdef>sd_journal *<parameter>j</parameter></paramdef>
+ </funcprototype>
+
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_journal_has_runtime_files()</function> returns a positive value
+ if runtime journal files (present in /run/systemd/journal/) have been found.
+ Otherwise returns 0.</para>
+
+ <para><function>sd_journal_has_persistent_files()</function> returns a positive value
+ if persistent journal files (present in /var/log/journal/) have been found.
+ Otherwise returns 0.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return value</title>
+ <para>Both <function>sd_journal_has_runtime_files()</function>
+ and <function>sd_journal_has_persistent_files()</function> return -EINVAL
+ if their argument is NULL.
+ </para>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/src/journal/journal-internal.h b/src/journal/journal-internal.h
index b51ecdb60..115d7776d 100644
--- a/src/journal/journal-internal.h
+++ b/src/journal/journal-internal.h
@@ -115,6 +115,8 @@ struct sd_journal {
removed, and there were no more
files, so sd_j_enumerate_unique
will return a value equal to 0. */
+ bool has_runtime_files:1;
+ bool has_persistent_files:1;
size_t data_threshold;
diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
index 9b9e8ac85..20456c3a1 100644
--- a/src/journal/sd-journal.c
+++ b/src/journal/sd-journal.c
@@ -1230,8 +1230,7 @@ static int add_any_file(sd_journal *j, const char *path) {
}
static int add_file(sd_journal *j, const char *prefix, const char *filename) {
- _cleanup_free_ char *path = NULL;
- int r;
+ char *path = NULL;
assert(j);
assert(prefix);
@@ -1241,14 +1240,14 @@ static int add_file(sd_journal *j, const char *prefix, const char *filename) {
!file_type_wanted(j->flags, filename))
return 0;
- path = strjoin(prefix, "/", filename, NULL);
- if (!path)
- return -ENOMEM;
+ path = strjoina(prefix, "/", filename);
- r = add_any_file(j, path);
- if (r == -ENOENT)
- return 0;
- return r;
+ if (!j->has_runtime_files && path_startswith(path, "/run/log/journal"))
+ j->has_runtime_files = true;
+ else if (!j->has_persistent_files && path_startswith(path, "/var/log/journal"))
+ j->has_persistent_files = true;
+
+ return add_any_file(j, path);
}
static int remove_file(sd_journal *j, const char *prefix, const char *filename) {
@@ -2616,3 +2615,15 @@ _public_ int sd_journal_get_data_threshold(sd_journal *j, size_t *sz) {
*sz = j->data_threshold;
return 0;
}
+
+_public_ int sd_journal_has_runtime_files(sd_journal *j) {
+ assert_return(j, -EINVAL);
+
+ return j->has_runtime_files;
+}
+
+_public_ int sd_journal_has_persistent_files(sd_journal *j) {
+ assert_return(j, -EINVAL);
+
+ return j->has_persistent_files;
+}
diff --git a/src/systemd/sd-journal.h b/src/systemd/sd-journal.h
index 00237a215..d5fd46eea 100644
--- a/src/systemd/sd-journal.h
+++ b/src/systemd/sd-journal.h
@@ -138,6 +138,9 @@ int sd_journal_reliable_fd(sd_journal *j);
int sd_journal_get_catalog(sd_journal *j, char **text);
int sd_journal_get_catalog_for_message_id(sd_id128_t id, char **text);
+int sd_journal_has_runtime_files(sd_journal *j);
+int sd_journal_has_persistent_files(sd_journal *j);
+
/* the inverse condition avoids ambiguity of danling 'else' after the macro */
#define SD_JOURNAL_FOREACH(j) \
if (sd_journal_seek_head(j) < 0) { } \