Give a better error when opening a DCP with File -> Open by mistake (#1723).

3 files changed, 27 insertions, 0 deletions

diff --git a/src/lib/exceptions.cc b/src/lib/exceptions.cc
index 99d4c3979..ba3d4a05c 100644
--- a/src/lib/exceptions.cc
+++ b/src/lib/exceptions.cc
@@ -40,6 +40,13 @@ OpenFileError::OpenFileError (boost::filesystem::path f, int error, Mode mode)
 
 }
 
+FileNotFoundError::FileNotFoundError (boost::filesystem::path f)
+	: runtime_error(String::compose("File %1 not found", f.string()))
+	, _file (f)
+{
+
+}
+
 ReadFileError::ReadFileError (boost::filesystem::path f, int e)
 	: FileError (String::compose (_("could not read from file %1 (%2)"), f.string(), strerror (e)), f)
 {
diff --git a/src/lib/exceptions.h b/src/lib/exceptions.h
index 391258bd5..73b8cc85a 100644
--- a/src/lib/exceptions.h
+++ b/src/lib/exceptions.h
@@ -117,6 +117,22 @@ public:
 	OpenFileError (boost::filesystem::path f, int error, Mode mode);
 };
 
+class FileNotFoundError : public std::runtime_error
+{
+public:
+	FileNotFoundError (boost::filesystem::path f);
+	virtual ~FileNotFoundError () throw () {}
+
+	/** @return name of the file that this exception concerns */
+	boost::filesystem::path file () const {
+		return _file;
+	}
+
+private:
+	/** name of the file that this exception concerns */
+	boost::filesystem::path _file;
+};
+
 /** @class ReadFileError.
  *  @brief Indicates that some error occurred when trying to read from a file
  */
diff --git a/src/lib/film.cc b/src/lib/film.cc
index 90b18ea70..691ef58da 100644
--- a/src/lib/film.cc
+++ b/src/lib/film.cc
@@ -475,6 +475,10 @@ Film::read_metadata (optional<boost::filesystem::path> path)
 		path = file (metadata_file);
 	}
 
+	if (!boost::filesystem::exists(*path)) {
+		throw FileNotFoundError(*path);
+	}
+
 	cxml::Document f ("Metadata");
 	f.read_file (path.get ());