[OpenWrt-Devel] [PATCH 2/3] file: add support for setting mode when writing files

[Luka Perkov]

Signed-off-by: Luka Perkov <luka at openwrt.org>
---
=> changes in v2:

Return umask() to previous value after temporary changing it.

 file.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/file.c b/file.c
index d39dccb..fe1bc39 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_MODE,
 	RPC_F_RW_BASE64,
 	__RPC_F_RW_MAX,
 };
@@ -100,6 +101,7 @@ 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_MODE]   = { .name = "mode",   .type = BLOBMSG_TYPE_INT32  },
 	[RPC_F_RW_BASE64] = { .name = "base64", .type = BLOBMSG_TYPE_BOOL   },
 };
 
@@ -263,6 +265,7 @@ rpc_file_write(struct ubus_context *ctx, struct ubus_object *obj,
                struct blob_attr *msg)
 {
 	struct blob_attr *tb[__RPC_F_RW_MAX];
+	mode_t prev_mode, mode = 0666;
 	int fd, rv = 0;
 	void *data = NULL;
 	size_t data_len = 0;
@@ -276,7 +279,13 @@ 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 ((fd = open(blobmsg_data(tb[RPC_F_RW_PATH]), O_CREAT | O_TRUNC | O_WRONLY, 0666)) < 0)
+	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);
+	umask(prev_mode);
+	if (fd < 0)
 		return rpc_errno_status();
 
 	if (tb[RPC_F_RW_BASE64] && blobmsg_get_bool(tb[RPC_F_RW_BASE64]))
-- 
2.4.0
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