Set up a file logger

Get a file path from the `LOG_FILE` environment variable and use it for
log output.

Call `database::get_database_connection()` and log the error if it
fails.

Worried about exiting early from the FastCGI program, as DreamHost says
this causes problems
(https://help.dreamhost.com/hc/en-us/articles/217298967). But I don't
see how the program can continue without a database connection.

Return a `Result` from `main()` because it's easier to use the `?`
operator for errors that happen before logging is initialised.

1 files changed, 3 insertions, 0 deletions

diff --git a/license-generator/src/errors.rs b/license-generator/src/errors.rs
index 29f25ca..0a28341 100644
--- a/license-generator/src/errors.rs
+++ b/license-generator/src/errors.rs
@@ -1,9 +1,12 @@
+use log;
 use mysql;
 
 error_chain! {
     foreign_links {
         EnvVar(::std::env::VarError);
+        Io(::std::io::Error);
 
+        Log(log::SetLoggerError);
         MySql(mysql::error::Error);
     }
 }