luci-base: fallback to a simple text editor if uci config cannot be loaded

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

2 files changed, 43 insertions, 2 deletions

diff --git a/modules/luci-base/luasrc/cbi.lua b/modules/luci-base/luasrc/cbi.lua
index 34de44a5f0..7c5944bf27 100644
--- a/modules/luci-base/luasrc/cbi.lua
+++ b/modules/luci-base/luasrc/cbi.lua
@@ -12,6 +12,7 @@ require("luci.http")
 local fs         = require("nixio.fs")
 local uci        = require("luci.model.uci")
 local datatypes  = require("luci.cbi.datatypes")
+local dispatcher = require("luci.dispatcher")
 local class      = util.class
 local instanceof = util.instanceof
 
@@ -307,8 +308,29 @@ function Map.__init__(self, config, ...)
 
 	self.changed = false
 
-	if not self.uci:load(self.config) then
-		error("Unable to read UCI data: " .. self.config)
+	local path = "%s/%s" %{ self.uci:get_confdir(), self.config }
+	if fs.stat(path, "type") ~= "reg" then
+		fs.writefile(path, "")
+	end
+
+	local ok, err = self.uci:load(self.config)
+	if not ok then
+		local url = dispatcher.build_url(unpack(dispatcher.context.request))
+		local source = self:formvalue("cbi.source")
+		if type(source) == "string" then
+			fs.writefile(path, source:gsub("\r\n", "\n"))
+			ok, err = self.uci:load(self.config)
+			if ok then
+				luci.http.redirect(url)
+			end
+		end
+	end
+
+	if not ok then
+		self.template   = "cbi/error"
+		self.error      = err
+		self.source     = fs.readfile(path) or ""
+		self.pageaction = false
 	end
 end
 
diff --git a/modules/luci-base/luasrc/view/cbi/error.htm b/modules/luci-base/luasrc/view/cbi/error.htm
new file mode 100644
index 0000000000..2acb96924e
--- /dev/null
+++ b/modules/luci-base/luasrc/view/cbi/error.htm
@@ -0,0 +1,19 @@
+<div class="cbi-map" id="cbi-<%=self.config%>">
+	<% if self.title and #self.title > 0 then %><h2><a id="content" name="content"><%=self.title%></a></h2><% end %>
+	<% if self.description and #self.description > 0 then %><div class="cbi-map-descr"><%=self.description%></div><% end %>
+
+	<p class="alert-message danger">
+		<%: The configuration file could not be loaded due to the following error: %><br />
+		<code><%=pcdata(self.error)%></code>
+	</p>
+
+	<textarea name="cbi.source" style="width:100%; margin-bottom:1em" rows="<%=math.max(self.source:cmatch("\n"), 10)%>"><%=pcdata(self.source)%></textarea>
+
+	<p class="alert-message">
+		<%: Edit the raw configuration data above to fix any error and hit "Save" to reload the page. %>
+	</p>
+
+	<div class="cbi-page-actions">
+		<input class="cbi-button cbi-button-apply" type="submit" name="cbi.save" value="<%:Save%>" />
+	</div>
+</div>