base/SOURCES/0593-journalctl-when-we-fail-to-open-a-journal-file-print.patch

From 9f7b08ba18ac3d4fd51e70d78d44b60ffb65411f Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 2 Nov 2015 23:37:05 +0100
Subject: [PATCH] journalctl: when we fail to open a journal file, print why

When we enumerate journal files and encounter an invalid one, remember
which this, and show it to the user.

Note the possibly slightly surprising logic here: we store only one path
per error code. This means we show all error kinds but not every actual
error we encounter. This has the benefit of not requiring us to keep a
potentially unbounded list of errors with their sources around, but can
still provide a pretty complete overview on the errors we encountered.

Fixes #1669.

(cherry picked from commit 5768d2594940668506bb4cafa078f654cc20dc5a)

Resolves: #1465759
---
 src/journal/journal-internal.h |  2 +-
 src/journal/journalctl.c       | 27 ++++++++++++++++++-----
 src/journal/sd-journal.c       | 49 ++++++++++++++++++++++++++++++++++--------
 3 files changed, 63 insertions(+), 15 deletions(-)

diff --git a/src/journal/journal-internal.h b/src/journal/journal-internal.h
index 115d7776d..eb23ac28a 100644
--- a/src/journal/journal-internal.h
+++ b/src/journal/journal-internal.h
@@ -123,7 +123,7 @@ struct sd_journal {
         Hashmap *directories_by_path;
         Hashmap *directories_by_wd;
 
-        Set *errors;
+        Hashmap *errors;
 };
 
 char *journal_make_match_string(sd_journal *j);
diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 8c8379732..0be70764e 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -1783,33 +1783,50 @@ static int access_check_var_log_journal(sd_journal *j) {
 static int access_check(sd_journal *j) {
         Iterator it;
         void *code;
+        char *path;
         int r = 0;
 
         assert(j);
 
-        if (set_isempty(j->errors)) {
+        if (hashmap_isempty(j->errors)) {
                 if (ordered_hashmap_isempty(j->files))
                         log_notice("No journal files were found.");
 
                 return 0;
         }
 
-        if (set_contains(j->errors, INT_TO_PTR(-EACCES))) {
+        if (hashmap_contains(j->errors, INT_TO_PTR(-EACCES))) {
                 (void) access_check_var_log_journal(j);
 
                 if (ordered_hashmap_isempty(j->files))
                         r = log_error_errno(EACCES, "No journal files were opened due to insufficient permissions.");
         }
 
-        SET_FOREACH(code, j->errors, it) {
+        HASHMAP_FOREACH_KEY(path, code, j->errors, it) {
                 int err;
 
                 err = abs(PTR_TO_INT(code));
 
-                if (err == EACCES)
+                switch (err) {
+                case EACCES:
                         continue;
 
-                log_warning_errno(err, "An error was encountered while opening journal files, ignoring: %m");
+                case ENODATA:
+                        log_warning_errno(err, "Journal file %s is truncated, ignoring file.", path);
+                        break;
+
+                case EPROTONOSUPPORT:
+                        log_warning_errno(err, "Journal file %s uses an unsupported feature, ignoring file.", path);
+                        break;
+
+                case EBADMSG:
+                        log_warning_errno(err, "Journal file %s corrupted, ignoring file.", path);
+                        break;
+
+                default:
+                        log_warning_errno(err, "An error was encountered while opening journal file %s, ignoring file.", path);
+                        break;
+                }
         }
 
         return r;
diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
index 9895d9608..14b65cfed 100644
--- a/src/journal/sd-journal.c
+++ b/src/journal/sd-journal.c
@@ -62,19 +62,46 @@ static bool journal_pid_changed(sd_journal *j) {
         return j->original_pid != getpid();
 }
 
-/* We return an error here only if we didn't manage to
-   memorize the real error. */
-static int set_put_error(sd_journal *j, int r) {
+static int journal_put_error(sd_journal *j, int r, const char *path) {
+        char *copy;
         int k;
 
+        /* Memorize an error we encountered, and store which
+         * file/directory it was generated from. Note that we store
+         * only *one* path per error code, as the error code is the
+         * key into the hashmap, and the path is the value. This means
+         * we keep track only of all error kinds, but not of all error
+         * locations. This has the benefit that the hashmap cannot
+         * grow beyond bounds.
+         *
+         * We return an error here only if we didn't manage to
+         * memorize the real error. */
+
         if (r >= 0)
                 return r;
 
-        k = set_ensure_allocated(&j->errors, NULL);
+        k = hashmap_ensure_allocated(&j->errors, NULL);
         if (k < 0)
                 return k;
 
-        return set_put(j->errors, INT_TO_PTR(r));
+        if (path) {
+                copy = strdup(path);
+                if (!copy)
+                        return -ENOMEM;
+        } else
+                copy = NULL;
+
+        k = hashmap_put(j->errors, INT_TO_PTR(r), copy);
+        if (k < 0) {
+                free(copy);
+
+                if (k == -EEXIST)
+                        return 0;
+
+                return k;
+        }
+
+        return 0;
 }
 
 static void detach_location(sd_journal *j) {
@@ -1234,7 +1261,7 @@ static int add_any_file(sd_journal *j, const char *path) {
         return 0;
 
 fail:
-        k = set_put_error(j, r);
+        k = journal_put_error(j, r, path);
         if (k < 0)
                 return k;
 
@@ -1396,7 +1423,7 @@ static int add_directory(sd_journal *j, const char *prefix, const char *dirname)
         return 0;
 
 fail:
-        k = set_put_error(j, r);
+        k = journal_put_error(j, r, path ?: dirname);
         if (k < 0)
                 return k;
 
@@ -1487,7 +1514,7 @@ static int add_root_directory(sd_journal *j, const char *p, bool missing_ok) {
         return 0;
 
 fail:
-        k = set_put_error(j, r);
+        k = journal_put_error(j, r, p);
         if (k < 0)
                 return k;
 
@@ -1732,6 +1759,7 @@ fail:
 _public_ void sd_journal_close(sd_journal *j) {
         Directory *d;
         JournalFile *f;
+        char *p;
 
         if (!j)
                 return;
@@ -1759,10 +1787,13 @@ _public_ void sd_journal_close(sd_journal *j) {
                 mmap_cache_unref(j->mmap);
         }
 
+        while ((p = hashmap_steal_first(j->errors)))
+                free(p);
+        hashmap_free(j->errors);
+
         free(j->path);
         free(j->prefix);
         free(j->unique_field);
-        set_free(j->errors);
         free(j);
 }