From 84d816c48b57b43e833e2917bbd278c116816fcf Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 28 Jan 2016 20:15:49 +0100
Subject: [PATCH] nspawn: make journal linking non-fatal in try and auto modes

Fixes #2091
---
 src/nspawn/nspawn.c | 39 ++++++++++++++++++++-------------------
 1 file changed, 20 insertions(+), 19 deletions(-)

diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index f6a2c03..97ea51a 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -1338,6 +1338,7 @@ static int setup_journal(const char *directory) {
         sd_id128_t machine_id, this_id;
         _cleanup_free_ char *b = NULL, *d = NULL;
         const char *etc_machine_id, *p, *q;
+        bool try;
         char *id;
         int r;
 
@@ -1345,16 +1346,21 @@ static int setup_journal(const char *directory) {
         if (arg_ephemeral)
                 return 0;
 
+        if (arg_link_journal == LINK_NO)
+                return 0;
+
+        try = arg_link_journal_try || arg_link_journal == LINK_AUTO;
+
         etc_machine_id = prefix_roota(directory, "/etc/machine-id");
 
         r = read_one_line_file(etc_machine_id, &b);
-        if (r == -ENOENT && arg_link_journal == LINK_AUTO)
+        if (r == -ENOENT && try)
                 return 0;
         else if (r < 0)
                 return log_error_errno(r, "Failed to read machine ID from %s: %m", etc_machine_id);
 
         id = strstrip(b);
-        if (isempty(id) && arg_link_journal == LINK_AUTO)
+        if (isempty(id) && try)
                 return 0;
 
         /* Verify validity */
@@ -1367,16 +1373,13 @@ static int setup_journal(const char *directory) {
                 return log_error_errno(r, "Failed to retrieve machine ID: %m");
 
         if (sd_id128_equal(machine_id, this_id)) {
-                log_full(arg_link_journal == LINK_AUTO ? LOG_WARNING : LOG_ERR,
+                log_full(try ? LOG_WARNING : LOG_ERR,
                          "Host and machine ids are equal (%s): refusing to link journals", id);
-                if (arg_link_journal == LINK_AUTO)
+                if (try)
                         return 0;
                 return -EEXIST;
         }
 
-        if (arg_link_journal == LINK_NO)
-                return 0;
-
         r = userns_mkdir(directory, "/var", 0755, 0, 0);
         if (r < 0)
                 return log_error_errno(r, "Failed to create /var: %m");
@@ -1393,21 +1396,19 @@ static int setup_journal(const char *directory) {
         q = prefix_roota(directory, p);
 
         if (path_is_mount_point(p, 0) > 0) {
-                if (arg_link_journal != LINK_AUTO) {
-                        log_error("%s: already a mount point, refusing to use for journal", p);
-                        return -EEXIST;
-                }
+                if (try)
+                        return 0;
 
-                return 0;
+                log_error("%s: already a mount point, refusing to use for journal", p);
+                return -EEXIST;
         }
 
         if (path_is_mount_point(q, 0) > 0) {
-                if (arg_link_journal != LINK_AUTO) {
-                        log_error("%s: already a mount point, refusing to use for journal", q);
-                        return -EEXIST;
-                }
+                if (try)
+                        return 0;
 
-                return 0;
+                log_error("%s: already a mount point, refusing to use for journal", q);
+                return -EEXIST;
         }
 
         r = readlink_and_make_absolute(p, &d);
@@ -1441,7 +1442,7 @@ static int setup_journal(const char *directory) {
         if (arg_link_journal == LINK_GUEST) {
 
                 if (symlink(q, p) < 0) {
-                        if (arg_link_journal_try) {
+                        if (try) {
                                 log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p);
                                 return 0;
                         } else
@@ -1459,7 +1460,7 @@ static int setup_journal(const char *directory) {
                  * permanent journal set up, don't force it here */
                 r = mkdir(p, 0755);
                 if (r < 0) {
-                        if (arg_link_journal_try) {
+                        if (try) {
                                 log_debug_errno(errno, "Failed to create %s, skipping journal setup: %m", p);
                                 return 0;
                         } else
-- 
2.7.0