From 574edc90066c3faeadcf4666928ed9b0ac409c75 Mon Sep 17 00:00:00 2001
From: Martin Pitt <martin.pitt@ubuntu.com>
Date: Thu, 20 Nov 2014 14:30:52 +0100
Subject: nspawn: Add try-{host,guest} journal link modes

--link-journal={host,guest} fail if the host does not have persistent
journalling enabled and /var/log/journal/ does not exist. Even worse, as there
is no stdout/err any more, there is no error message to point that out.

Introduce two new modes "try-host" and "try-guest" which don't fail in this
case, and instead just silently skip the guest journal setup.

Change -j to mean "try-guest" instead of "guest", and fix the wrong --help
output for it (it said "host" before).

Change systemd-nspawn@.service.in to use "try-guest" so that this unit works
with both persistent and non-persistent journals on the host without failing.

https://bugs.debian.org/770275
---
 man/systemd-nspawn.xml | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

(limited to 'man')

diff --git a/man/systemd-nspawn.xml b/man/systemd-nspawn.xml
index b3a2d32855..75db65eac0 100644
--- a/man/systemd-nspawn.xml
+++ b/man/systemd-nspawn.xml
@@ -439,7 +439,9 @@
                                 versa). Takes one of
                                 <literal>no</literal>,
                                 <literal>host</literal>,
+                                <literal>try-host</literal>,
                                 <literal>guest</literal>,
+                                <literal>try-guest</literal>,
                                 <literal>auto</literal>. If
                                 <literal>no</literal>, the journal is
                                 not linked. If <literal>host</literal>,
@@ -453,8 +455,11 @@
                                 guest file system (beneath
                                 <filename>/var/log/journal/<replaceable>machine-id</replaceable></filename>)
                                 and the subdirectory is symlinked into the host
-                                at the same location. If
-                                <literal>auto</literal> (the default),
+                                at the same location. <literal>try-host</literal>
+                                and <literal>try-guest</literal> do the same
+                                but do not fail if the host does not have
+                                persistant journalling enabled.
+                                If <literal>auto</literal> (the default),
                                 and the right subdirectory of
                                 <filename>/var/log/journal</filename>
                                 exists, it will be bind mounted
@@ -473,7 +478,7 @@
                                 <term><option>-j</option></term>
 
                                 <listitem><para>Equivalent to
-                                <option>--link-journal=guest</option>.</para></listitem>
+                                <option>--link-journal=try-guest</option>.</para></listitem>
                         </varlistentry>
 
                         <varlistentry>
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