Introduce new 'docker run' validation command

docker/docker-entrypoint.sh

@@ -45,6 +45,9 @@ elif [ "$1" = "start-worker" ] ; then
   php artisan storage:mkdirs
   php -d memory_limit=-1 artisan queue:work --verbose --max-time=3600 --memory=${WORKER_MEMORY_LIMIT:-256}
 
+elif [ "$1" = "validate-xml" ] ; then
+  php artisan submission:validate /tmp/validate/*.xml
+
 # Otherwise, throw an error...
 else
   echo "Unknown argument(s) provided: $*"

docs/xml-validation.md

@@ -0,0 +1,63 @@
+# Validating XML files for CDash
+
+CDash maintains a set of schema files for the expected structure of
+the incoming XML files that will be parsed.  Normally, this is not a
+problem as CTest writes properly formatted files.
+
+In the rare case that the XML files are not being created by CTest, we have a
+few opportunities for the user to be informed that there are problems
+with the XML files that are uploaded
+
+1. Prior to Submission
+
+The CDash Docker container has an entry point which will look for files within
+a directory which has been mounted to the container.  The directory of files
+should be mounted to `/tmp/validate` using the `-v` flag.  The entry point
+to call `validate-xml` should be executed via the `docker run` command.
+
+```bash
+docker run -v /example/host/directory/xml:/tmp/validate kitware/cdash validate-xml
+```
+For example, when all files are properly validated, the report would print to
+the screen like this:
+
+```bash
+Validated file: /tmp/validate/Build.xml.
+Validated file: /tmp/validate/Configure.xml.
+Validated file: /tmp/validate/Coverage.xml.
+Validated file: /tmp/validate/CoverageLog-0.xml.
+Validated file: /tmp/validate/Done.xml.
+Validated file: /tmp/validate/Test.xml.
+```
+
+Errors in a file will be printed to the screen:
+
+```bash
+WARNING: Element 'Site': The attribute 'Name' is required but missing.
+ in /tmp/validate/Build.xml, line: 25, column: 0
+Validated file: /tmp/validate/Configure.xml.
+Validated file: /tmp/validate/Coverage.xml.
+Validated file: /tmp/validate/CoverageLog-0.xml.
+FAILED: Some XML file checks did not pass!
+```
+
+2. During Submission
+
+For validation during the submission process, CDash will look at the
+`VALIDATE_SUBMISSIONS` environment variable.  The value of the variable
+determines how strict CDash will be when accepting XML files that may be
+invalid.
+
+* `SILENT`
+  * CDash will log a message to its log file about the failures it finds,
+    but will continue to process the content of the file.
+  * This is the default value.
+* `WARN`
+  * CDash will log a message to its log file about the failures it finds.
+    It will also send the failure results in the `message` attribute of the
+    response from the HTTP request but will continue processing the content
+    of the file.
+* `REJECT`
+  * CDash will log a message to its log file about the failures it finds.
+    It will also halt processing the file, returning a 400 response code, and
+    informing the user the failure results