From 4b1ddfb8358bcd57560406db26d7041c9c0cb90b Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 3 Feb 2008 00:03:56 +0100
Subject: [PATCH] implement overwriting import

---
 cli.c  | 15 ++++++++++---
 file.c | 71 +++++++++++++++++++++++++++++++++++++---------------------
 uci.h  |  3 ++-
 3 files changed, 60 insertions(+), 29 deletions(-)

diff --git a/cli.c b/cli.c
index 828c7b9..1a478bb 100644
--- a/cli.c
+++ b/cli.c
@@ -91,7 +91,7 @@ static int package_cmd(int cmd, char *package)
 	}
 	switch(cmd) {
 	case CMD_COMMIT:
-		if (uci_commit(ctx, &p) != UCI_OK)
+		if (uci_commit(ctx, &p, false) != UCI_OK)
 			uci_perror(ctx, appname);
 		break;
 	case CMD_EXPORT:
@@ -128,8 +128,17 @@ static int uci_do_import(int argc, char **argv)
 			package = NULL;
 	}
 	ret = uci_import(ctx, input, name, &package, (name != NULL));
-	if ((ret == UCI_OK) && (flags & CLI_FLAG_MERGE)) {
-		ret = uci_save(ctx, package);
+	if (ret == UCI_OK) {
+		if (flags & CLI_FLAG_MERGE) {
+			ret = uci_save(ctx, package);
+		} else {
+			struct uci_element *e;
+			/* loop through all config sections and overwrite existing data */
+			uci_foreach_element(&ctx->root, e) {
+				struct uci_package *p = uci_to_package(e);
+				ret = uci_commit(ctx, &p, true);
+			}
+		}
 	}
 
 	if (ret != UCI_OK) {
diff --git a/file.c b/file.c
index 9f47ef2..8e7f0ce 100644
--- a/file.c
+++ b/file.c
@@ -745,7 +745,8 @@ static void uci_load_history(struct uci_context *ctx, struct uci_package *p, boo
 
 	UCI_TRAP_SAVE(ctx, done);
 	f = uci_open_stream(ctx, filename, SEEK_SET, flush, false);
-	uci_parse_history(ctx, f, p);
+	if (p)
+		uci_parse_history(ctx, f, p);
 	UCI_TRAP_RESTORE(ctx);
 
 done:
@@ -760,6 +761,18 @@ done:
 }
 
 
+static char *uci_config_path(struct uci_context *ctx, const char *name)
+{
+	char *filename;
+
+	if (strchr(name, '/'))
+		UCI_THROW(ctx, UCI_ERR_INVAL);
+	filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
+	sprintf(filename, UCI_CONFDIR "/%s", name);
+
+	return filename;
+}
+
 int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
 {
 	char *filename;
@@ -783,10 +796,7 @@ int uci_load(struct uci_context *ctx, const char *name, struct uci_package **pac
 		break;
 	default:
 		/* config in /etc/config */
-		if (strchr(name, '/'))
-			UCI_THROW(ctx, UCI_ERR_INVAL);
-		filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
-		sprintf(filename, UCI_CONFDIR "/%s", name);
+		filename = uci_config_path(ctx, name);
 		confdir = true;
 		break;
 	}
@@ -824,7 +834,7 @@ int uci_save(struct uci_context *ctx, struct uci_package *p)
 	 * does not modify the uci_package pointer
 	 */
 	if (!p->confdir)
-		return uci_commit(ctx, &p);
+		return uci_commit(ctx, &p, false);
 
 	if (uci_list_empty(&p->history))
 		return 0;
@@ -866,7 +876,7 @@ done:
 	return 0;
 }
 
-int uci_commit(struct uci_context *ctx, struct uci_package **package)
+int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
 {
 	struct uci_package *p;
 	FILE *f = NULL;
@@ -878,7 +888,13 @@ int uci_commit(struct uci_context *ctx, struct uci_package **package)
 	p = *package;
 
 	UCI_ASSERT(ctx, p != NULL);
-	UCI_ASSERT(ctx, p->path != NULL);
+	if (!p->path) {
+		if (overwrite)
+			p->path = uci_config_path(ctx, p->e.name);
+		else
+			UCI_THROW(ctx, UCI_ERR_INVAL);
+	}
+
 
 	/* open the config file for writing now, so that it is locked */
 	f = uci_open_stream(ctx, p->path, SEEK_SET, true, true);
@@ -886,23 +902,28 @@ int uci_commit(struct uci_context *ctx, struct uci_package **package)
 	/* flush unsaved changes and reload from history file */
 	UCI_TRAP_SAVE(ctx, done);
 	if (p->confdir) {
-		name = uci_strdup(ctx, p->e.name);
-		path = uci_strdup(ctx, p->path);
-		if (!uci_list_empty(&p->history))
-			UCI_INTERNAL(uci_save, ctx, p);
-		uci_free_package(&p);
-		uci_file_cleanup(ctx);
-		UCI_INTERNAL(uci_import, ctx, f, name, &p, true);
-
-		p->path = path;
-		p->confdir = true;
-		*package = p;
-
-		/* freed together with the uci_package */
-		path = NULL;
-
-		/* check for updated history, just in case */
-		uci_load_history(ctx, p, true);
+		if (!overwrite) {
+			name = uci_strdup(ctx, p->e.name);
+			path = uci_strdup(ctx, p->path);
+			if (!uci_list_empty(&p->history))
+				UCI_INTERNAL(uci_save, ctx, p);
+			uci_free_package(&p);
+			uci_file_cleanup(ctx);
+			UCI_INTERNAL(uci_import, ctx, f, name, &p, true);
+
+			p->path = path;
+			p->confdir = true;
+			*package = p;
+
+			/* freed together with the uci_package */
+			path = NULL;
+
+			/* check for updated history, just in case */
+			uci_load_history(ctx, p, true);
+		} else {
+			/* flush history */
+			uci_load_history(ctx, NULL, true);
+		}
 	}
 
 	rewind(f);
diff --git a/uci.h b/uci.h
index 6b5de9a..574a384 100644
--- a/uci.h
+++ b/uci.h
@@ -214,11 +214,12 @@ extern int uci_save(struct uci_context *ctx, struct uci_package *p);
  * uci_commit: commit changes to a package
  * @ctx: uci context
  * @p: uci_package struct pointer
+ * @overwrite: overwrite existing config data and flush history
  *
  * committing may reload the whole uci_package data,
  * the supplied pointer is updated accordingly
  */
-extern int uci_commit(struct uci_context *ctx, struct uci_package **p);
+extern int uci_commit(struct uci_context *ctx, struct uci_package **p, bool overwrite);
 
 /**
  * uci_list_configs: List available uci config files
-- 
2.25.1