Instead of writing warnings to stderr, write them to a log.  Later, we'll
probably be daemonized, so writing to stderr will be pointless.

Signed-off-by: David Turner <[email protected]>
---
 Documentation/git-index-helper.txt |  3 +++
 index-helper.c                     | 29 ++++++++++++++++++++++++++---
 2 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/Documentation/git-index-helper.txt 
b/Documentation/git-index-helper.txt
index a5c058f..4eb3d95 100644
--- a/Documentation/git-index-helper.txt
+++ b/Documentation/git-index-helper.txt
@@ -51,6 +51,9 @@ command. The following commands are used to control the 
daemon:
 
 All commands and replies are terminated by a 0 byte.
 
+In the event of an error, messages may be written to
+$GIT_DIR/index-helper.log.
+
 GIT
 ---
 Part of the linkgit:git[1] suite
diff --git a/index-helper.c b/index-helper.c
index 5cadd0d..7400d68 100644
--- a/index-helper.c
+++ b/index-helper.c
@@ -19,6 +19,29 @@ static struct shm shm_index;
 static struct shm shm_base_index;
 static int to_verify = 1;
 
+static void log_warning(const char *warning, ...)
+{
+       va_list ap;
+       FILE *fp;
+
+       fp = fopen(git_path("index-helper.log"), "a");
+       if (!fp)
+               /*
+                * Probably nobody will see this, but it's the best
+                * we can do.
+                */
+               die("Failed to open log for warnings");
+
+       fprintf(fp, "%"PRIuMAX"\t", (uintmax_t)time(NULL));
+
+       va_start(ap, warning);
+       vfprintf(fp, warning, ap);
+       va_end(ap);
+
+       fputc('\n', fp);
+       fclose(fp);
+}
+
 static void release_index_shm(struct shm *is)
 {
        if (!is->shm)
@@ -132,7 +155,7 @@ static int verify_shm(void)
                ce = istate.cache[i];
                if (ce->ce_namelen != base->ce_namelen ||
                    strcmp(ce->name, base->name)) {
-                       warning("mismatch at entry %d", i);
+                       log_warning("mismatch at entry %d", i);
                        break;
                }
                ce_flags = ce->ce_flags;
@@ -146,7 +169,7 @@ static int verify_shm(void)
                ce->ce_flags = ce_flags;
                base->ce_flags = base_flags;
                if (ret) {
-                       warning("mismatch at entry %d", i);
+                       log_warning("mismatch at entry %d", i);
                        break;
                }
        }
@@ -263,7 +286,7 @@ static void loop(int fd, int idle_in_seconds)
                                 * alive, nothing to do.
                                 */
                        } else {
-                               warning("BUG: Bogus command %s", buf);
+                               log_warning("BUG: Bogus command %s", buf);
                        }
                } else {
                        /*
-- 
2.4.2.767.g62658d5-twtrsrc

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