only overwrite config files at commit time when actual changes were made

diff --git a/file.c b/file.c
index c0141acd17964863f47e5c8b2447a49b89895802..bc6b5a9fb573a45c63471fda82bf5671e4f00533 100644 (file)
--- a/file.c
+++ b/file.c
@@ -676,10 +676,12 @@ int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overw
                        path = NULL;
 
                        /* check for updated history, flush */
-                       uci_load_history(ctx, p, true);
+                       if (!uci_load_history(ctx, p, true))
+                               goto done;
                } else {
                        /* flush history */
-                       uci_load_history(ctx, NULL, true);
+                       if (!uci_load_history(ctx, NULL, true))
+                               goto done;
                }
        }
 

diff --git a/history.c b/history.c
index 7ac8050291cfee8699e768dea6a55e3ce4e905a6..3a8b73e6e44db82092c3b2a424360b3029c1a336 100644 (file)
--- a/history.c
+++ b/history.c
@@ -97,9 +97,11 @@ error:
        UCI_THROW(ctx, UCI_ERR_PARSE);
 }
 
-static void uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_package *p)
+/* returns the number of changes that were successfully parsed */
+static int uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_package *p)
 {
        struct uci_parse_context *pctx;
+       int changes = 0;
 
        /* make sure no memory from previous parse attempts is leaked */
        ctx->internal = true;
@@ -121,6 +123,7 @@ static void uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_
                UCI_TRAP_SAVE(ctx, error);
                uci_parse_history_line(ctx, p, pctx->buf);
                UCI_TRAP_RESTORE(ctx);
+               changes++;
 error:
                continue;
        }
@@ -128,32 +131,38 @@ error:
        /* no error happened, we can get rid of the parser context now */
        ctx->internal = true;
        uci_cleanup(ctx);
+       return changes;
 }
 
-static void uci_load_history_file(struct uci_context *ctx, struct uci_package *p, char *filename, FILE **f, bool flush)
+/* returns the number of changes that were successfully parsed */
+static int uci_load_history_file(struct uci_context *ctx, struct uci_package *p, char *filename, FILE **f, bool flush)
 {
        FILE *stream = NULL;
+       int changes = 0;
 
        UCI_TRAP_SAVE(ctx, done);
        stream = uci_open_stream(ctx, filename, SEEK_SET, flush, false);
        if (p)
-               uci_parse_history(ctx, stream, p);
+               changes = uci_parse_history(ctx, stream, p);
        UCI_TRAP_RESTORE(ctx);
 done:
        if (f)
                *f = stream;
        else if (stream)
                uci_close_stream(stream);
+       return changes;
 }
 
-static void uci_load_history(struct uci_context *ctx, struct uci_package *p, bool flush)
+/* returns the number of changes that were successfully parsed */
+static int uci_load_history(struct uci_context *ctx, struct uci_package *p, bool flush)
 {
        struct uci_element *e;
        char *filename = NULL;
        FILE *f = NULL;
+       int changes = 0;
 
        if (!p->confdir)
-               return;
+               return 0;
 
        uci_foreach_element(&ctx->history_path, e) {
                if ((asprintf(&filename, "%s/%s", e->name, p->e.name) < 0) || !filename)
@@ -166,8 +175,8 @@ static void uci_load_history(struct uci_context *ctx, struct uci_package *p, boo
        if ((asprintf(&filename, "%s/%s", ctx->savedir, p->e.name) < 0) || !filename)
                UCI_THROW(ctx, UCI_ERR_MEM);
 
-       uci_load_history_file(ctx, p, filename, &f, flush);
-       if (flush && f) {
+       changes = uci_load_history_file(ctx, p, filename, &f, flush);
+       if (flush && f && (changes > 0)) {
                rewind(f);
                ftruncate(fileno(f), 0);
        }
@@ -175,6 +184,7 @@ static void uci_load_history(struct uci_context *ctx, struct uci_package *p, boo
                free(filename);
        uci_close_stream(f);
        ctx->errno = 0;
+       return changes;
 }
 
 static void uci_filter_history(struct uci_context *ctx, const char *name, char *section, char *option)