X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fuci.git;a=blobdiff_plain;f=history.c;h=a31dbfaf1cb23d5ed196e4f6cbc66daf0a4ea042;hp=5b652b92f63ffc00e5f9b20ebaae24879674ae01;hb=c7430fd3578af03d9fe998f3195756603295ce2f;hpb=818f7b8433ae369c20fc56cccbb55b22043b9024

diff --git a/history.c b/history.c
index 5b652b9..a31dbfa 100644
--- a/history.c
+++ b/history.c
@@ -26,6 +26,42 @@
 #include <stdio.h>
 #include <ctype.h>
 
+/* record a change that was done to a package */
+void
+uci_add_history(struct uci_context *ctx, struct uci_list *list, int cmd, const char *section, const char *option, const char *value)
+{
+	struct uci_history *h;
+	int size = strlen(section) + 1;
+	char *ptr;
+
+	if (value)
+		size += strlen(value) + 1;
+
+	h = uci_alloc_element(ctx, history, option, size);
+	ptr = uci_dataptr(h);
+	h->cmd = cmd;
+	h->section = strcpy(ptr, section);
+	if (value) {
+		ptr += strlen(ptr) + 1;
+		h->value = strcpy(ptr, value);
+	}
+	uci_list_add(list, &h->e.list);
+}
+
+void
+uci_free_history(struct uci_history *h)
+{
+	if (!h)
+		return;
+	if ((h->section != NULL) &&
+		(h->section != uci_dataptr(h))) {
+		free(h->section);
+		free(h->value);
+	}
+	uci_free_element(&h->e);
+}
+
+
 int uci_set_savedir(struct uci_context *ctx, const char *dir)
 {
 	char *sdir;
@@ -52,51 +88,96 @@ int uci_add_history_path(struct uci_context *ctx, const char *dir)
 	return 0;
 }
 
-static void uci_parse_history_line(struct uci_context *ctx, struct uci_package *p, char *buf)
+static inline int uci_parse_history_tuple(struct uci_context *ctx, char **buf, struct uci_ptr *ptr)
 {
-	bool delete = false;
-	bool rename = false;
-	char *package = NULL;
-	char *section = NULL;
-	char *option = NULL;
-	char *value = NULL;
-
-	if (buf[0] == '-') {
-		delete = true;
-		buf++;
-	} else if (buf[0] == '@') {
-		rename = true;
-		buf++;
+	int c = UCI_CMD_CHANGE;
+
+	switch(**buf) {
+	case '-':
+		c = UCI_CMD_REMOVE;
+		break;
+	case '@':
+		c = UCI_CMD_RENAME;
+		break;
+	case '+':
+		/* UCI_CMD_ADD is used for anonymous sections or list values */
+		c = UCI_CMD_ADD;
+		break;
+	case '|':
+		c = UCI_CMD_LIST_ADD;
+		break;
 	}
 
-	UCI_INTERNAL(uci_parse_tuple, ctx, buf, &package, &section, &option, &value);
-	if (!package || (strcmp(package, p->e.name) != 0))
-		goto error;
-	if (!uci_validate_name(section))
-		goto error;
-	if (option && !uci_validate_name(option))
+	if (c != UCI_CMD_CHANGE)
+		*buf += 1;
+
+	UCI_INTERNAL(uci_parse_ptr, ctx, ptr, *buf);
+
+	if (!ptr->section)
 		goto error;
-	if ((rename || !delete) && !uci_validate_name(value))
+	if (ptr->flags & UCI_LOOKUP_EXTENDED)
 		goto error;
 
-	if (rename)
-		UCI_INTERNAL(uci_rename, ctx, p, section, option, value);
-	else if (delete)
-		UCI_INTERNAL(uci_delete, ctx, p, section, option);
-	else
-		UCI_INTERNAL(uci_set, ctx, p, section, option, value);
+	switch(c) {
+	case UCI_CMD_RENAME:
+		if (!ptr->value || !uci_validate_name(ptr->value))
+			goto error;
+		break;
+	case UCI_CMD_LIST_ADD:
+		if (!ptr->option)
+			goto error;
+	}
+
+	return c;
 
+error:
+	UCI_THROW(ctx, UCI_ERR_INVAL);
+	return 0;
+}
+
+static void uci_parse_history_line(struct uci_context *ctx, struct uci_package *p, char *buf)
+{
+	struct uci_element *e = NULL;
+	struct uci_ptr ptr;
+	int cmd;
+
+	cmd = uci_parse_history_tuple(ctx, &buf, &ptr);
+	if (strcmp(ptr.package, p->e.name) != 0)
+		goto error;
+
+	if (ctx->flags & UCI_FLAG_SAVED_HISTORY)
+		uci_add_history(ctx, &p->saved_history, cmd, ptr.section, ptr.option, ptr.value);
+
+	switch(cmd) {
+	case UCI_CMD_RENAME:
+		UCI_INTERNAL(uci_rename, ctx, &ptr);
+		break;
+	case UCI_CMD_REMOVE:
+		UCI_INTERNAL(uci_delete, ctx, &ptr);
+		break;
+	case UCI_CMD_LIST_ADD:
+		UCI_INTERNAL(uci_add_list, ctx, &ptr);
+		break;
+	case UCI_CMD_ADD:
+	case UCI_CMD_CHANGE:
+		UCI_INTERNAL(uci_set, ctx, &ptr);
+		e = ptr.last;
+		if (!ptr.option && e && (cmd == UCI_CMD_ADD))
+			uci_to_section(e)->anonymous = true;
+		break;
+	}
 	return;
 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;
 	uci_cleanup(ctx);
 
 	pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
@@ -115,39 +196,45 @@ 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;
 	}
 
 	/* 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;
+	if (!p->has_history)
+		return 0;
 
 	uci_foreach_element(&ctx->history_path, e) {
 		if ((asprintf(&filename, "%s/%s", e->name, p->e.name) < 0) || !filename)
@@ -160,15 +247,129 @@ 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);
 	}
 	if (filename)
 		free(filename);
 	uci_close_stream(f);
-	ctx->errno = 0;
+	ctx->err = 0;
+	return changes;
+}
+
+static void uci_filter_history(struct uci_context *ctx, const char *name, const char *section, const char *option)
+{
+	struct uci_parse_context *pctx;
+	struct uci_element *e, *tmp;
+	struct uci_list list;
+	char *filename = NULL;
+	struct uci_ptr ptr;
+	FILE *f = NULL;
+
+	uci_list_init(&list);
+	uci_alloc_parse_context(ctx);
+	pctx = ctx->pctx;
+
+	if ((asprintf(&filename, "%s/%s", ctx->savedir, name) < 0) || !filename)
+		UCI_THROW(ctx, UCI_ERR_MEM);
+
+	UCI_TRAP_SAVE(ctx, done);
+	f = uci_open_stream(ctx, filename, SEEK_SET, true, false);
+	pctx->file = f;
+	while (!feof(f)) {
+		struct uci_element *e;
+		char *buf;
+
+		uci_getln(ctx, 0);
+		buf = pctx->buf;
+		if (!buf[0])
+			continue;
+
+		/* NB: need to allocate the element before the call to 
+		 * uci_parse_history_tuple, otherwise the original string 
+		 * gets modified before it is saved */
+		e = uci_alloc_generic(ctx, UCI_TYPE_HISTORY, pctx->buf, sizeof(struct uci_element));
+		uci_list_add(&list, &e->list);
+
+		uci_parse_history_tuple(ctx, &buf, &ptr);
+		if (section) {
+			if (!ptr.section || (strcmp(section, ptr.section) != 0))
+				continue;
+		}
+		if (option) {
+			if (!ptr.option || (strcmp(option, ptr.option) != 0))
+				continue;
+		}
+		/* match, drop this element again */
+		uci_free_element(e);
+	}
+
+	/* rebuild the history file */
+	rewind(f);
+	ftruncate(fileno(f), 0);
+	uci_foreach_element_safe(&list, tmp, e) {
+		fprintf(f, "%s\n", e->name);
+		uci_free_element(e);
+	}
+	UCI_TRAP_RESTORE(ctx);
+
+done:
+	if (filename)
+		free(filename);
+	uci_close_stream(pctx->file);
+	uci_foreach_element_safe(&list, tmp, e) {
+		uci_free_element(e);
+	}
+	uci_cleanup(ctx);
+}
+
+int uci_revert(struct uci_context *ctx, struct uci_ptr *ptr)
+{
+	char *package = NULL;
+	char *section = NULL;
+	char *option = NULL;
+
+	UCI_HANDLE_ERR(ctx);
+	expand_ptr(ctx, ptr, false);
+	UCI_ASSERT(ctx, ptr->p->has_history);
+
+	/* 
+	 * - flush unwritten changes
+	 * - save the package name
+	 * - unload the package
+	 * - filter the history
+	 * - reload the package
+	 */
+	UCI_TRAP_SAVE(ctx, error);
+	UCI_INTERNAL(uci_save, ctx, ptr->p);
+
+	/* NB: need to clone package, section and option names, 
+	 * as they may get freed on uci_free_package() */
+	package = uci_strdup(ctx, ptr->p->e.name);
+	if (ptr->section)
+		section = uci_strdup(ctx, ptr->section);
+	if (ptr->option)
+		option = uci_strdup(ctx, ptr->option);
+
+	uci_free_package(&ptr->p);
+	uci_filter_history(ctx, package, section, option);
+
+	UCI_INTERNAL(uci_load, ctx, package, &ptr->p);
+	UCI_TRAP_RESTORE(ctx);
+	ctx->err = 0;
+
+error:
+	if (package)
+		free(package);
+	if (section)
+		free(section);
+	if (option)
+		free(option);
+	if (ctx->err)
+		UCI_THROW(ctx, ctx->err);
+	return 0;
 }
 
 int uci_save(struct uci_context *ctx, struct uci_package *p)
@@ -176,6 +377,7 @@ int uci_save(struct uci_context *ctx, struct uci_package *p)
 	FILE *f = NULL;
 	char *filename = NULL;
 	struct uci_element *e, *tmp;
+	struct stat statbuf;
 
 	UCI_HANDLE_ERR(ctx);
 	UCI_ASSERT(ctx, p != NULL);
@@ -186,29 +388,47 @@ int uci_save(struct uci_context *ctx, struct uci_package *p)
 	 * directly.
 	 * does not modify the uci_package pointer
 	 */
-	if (!p->confdir)
+	if (!p->has_history)
 		return uci_commit(ctx, &p, false);
 
 	if (uci_list_empty(&p->history))
 		return 0;
 
+	if (stat(ctx->savedir, &statbuf) < 0)
+		mkdir(ctx->savedir, UCI_DIRMODE);
+	else if ((statbuf.st_mode & S_IFMT) != S_IFDIR)
+		UCI_THROW(ctx, UCI_ERR_IO);
+
 	if ((asprintf(&filename, "%s/%s", ctx->savedir, p->e.name) < 0) || !filename)
 		UCI_THROW(ctx, UCI_ERR_MEM);
 
-	ctx->errno = 0;
+	ctx->err = 0;
 	UCI_TRAP_SAVE(ctx, done);
 	f = uci_open_stream(ctx, filename, SEEK_END, true, true);
 	UCI_TRAP_RESTORE(ctx);
 
 	uci_foreach_element_safe(&p->history, tmp, e) {
 		struct uci_history *h = uci_to_history(e);
-
-		if (h->cmd == UCI_CMD_REMOVE)
-			fprintf(f, "-");
-		else if (h->cmd == UCI_CMD_RENAME)
-			fprintf(f, "@");
-
-		fprintf(f, "%s.%s", p->e.name, h->section);
+		char *prefix = "";
+
+		switch(h->cmd) {
+		case UCI_CMD_REMOVE:
+			prefix = "-";
+			break;
+		case UCI_CMD_RENAME:
+			prefix = "@";
+			break;
+		case UCI_CMD_ADD:
+			prefix = "+";
+			break;
+		case UCI_CMD_LIST_ADD:
+			prefix = "|";
+			break;
+		default:
+			break;
+		}
+
+		fprintf(f, "%s%s.%s", prefix, p->e.name, h->section);
 		if (e->name)
 			fprintf(f, ".%s", e->name);
 
@@ -223,8 +443,8 @@ done:
 	uci_close_stream(f);
 	if (filename)
 		free(filename);
-	if (ctx->errno)
-		UCI_THROW(ctx, ctx->errno);
+	if (ctx->err)
+		UCI_THROW(ctx, ctx->err);
 
 	return 0;
 }