From: Luka Perkov <luka@openwrt.org>
Date: Mon, 11 Apr 2016 16:56:51 +0000 (+0200)
Subject: file: add append write support
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Frpcd.git;a=commitdiff_plain;h=c8c8f7d0146f1aa1c5692c7b6717b794c347f3d4

file: add append write support

Signed-off-by: Luka Perkov <luka@openwrt.org>
---

diff --git a/file.c b/file.c
index d983518..91a55a1 100644
--- a/file.c
+++ b/file.c
@@ -93,6 +93,7 @@ static const struct blobmsg_policy rpc_file_rb_policy[__RPC_F_RB_MAX] = {
 enum {
 	RPC_F_RW_PATH,
 	RPC_F_RW_DATA,
+	RPC_F_RW_APPEND,
 	RPC_F_RW_MODE,
 	RPC_F_RW_BASE64,
 	__RPC_F_RW_MAX,
@@ -101,6 +102,7 @@ enum {
 static const struct blobmsg_policy rpc_file_rw_policy[__RPC_F_RW_MAX] = {
 	[RPC_F_RW_PATH]   = { .name = "path",   .type = BLOBMSG_TYPE_STRING },
 	[RPC_F_RW_DATA]   = { .name = "data",   .type = BLOBMSG_TYPE_STRING },
+	[RPC_F_RW_APPEND] = { .name = "append", .type = BLOBMSG_TYPE_BOOL  },
 	[RPC_F_RW_MODE]   = { .name = "mode",   .type = BLOBMSG_TYPE_INT32  },
 	[RPC_F_RW_BASE64] = { .name = "base64", .type = BLOBMSG_TYPE_BOOL   },
 };
@@ -265,6 +267,7 @@ rpc_file_write(struct ubus_context *ctx, struct ubus_object *obj,
                struct blob_attr *msg)
 {
 	struct blob_attr *tb[__RPC_F_RW_MAX];
+	int append = O_TRUNC;
 	mode_t prev_mode, mode = 0666;
 	int fd, rv = 0;
 	void *data = NULL;
@@ -279,11 +282,14 @@ rpc_file_write(struct ubus_context *ctx, struct ubus_object *obj,
 	data = blobmsg_data(tb[RPC_F_RW_DATA]);
 	data_len = blobmsg_data_len(tb[RPC_F_RW_DATA]) - 1;
 
+	if (tb[RPC_F_RW_APPEND] && blobmsg_get_bool(tb[RPC_F_RW_APPEND]))
+		append = O_APPEND;
+
 	if (tb[RPC_F_RW_MODE])
 		mode = blobmsg_get_u32(tb[RPC_F_RW_MODE]);
 
 	prev_mode = umask(0);
-	fd = open(blobmsg_data(tb[RPC_F_RW_PATH]), O_CREAT | O_WRONLY | O_TRUNC, mode);
+	fd = open(blobmsg_data(tb[RPC_F_RW_PATH]), O_CREAT | O_WRONLY | append, mode);
 	umask(prev_mode);
 	if (fd < 0)
 		return rpc_errno_status();