Fail better when no space in temp directory #855
Description
Two separate customers now have had support issues because there was no space in the file system with the temp directory. This is what happens:
- The source control menus do not load
- The Git Web UI does not load at all
- The settings page has a misleading warning message "File not found" under the Git executable path
- There is a mysterious ILLEGAL VALUE error in the app error log
The real issue is that Embedded Git is trying to run Git commands with output redirected to a temp file and the output redirection fails when the disk is full. We can't fix this ourselves but we should make it easier to discover the problem.