More relevant error message when a file to be registered is not located in the SAFE_DIR

[mkutouski]

Description
One needs to provide more relevant error message when the file an user trying to register in the DS is not located in any of the directories listed in the SAFE_DIR attribute.

To Reproduce

$ ls -al /home/test/test.sh 
-rwxrwxr-x 1 test test 223 Aug 29 07:53 /home/test/test.sh

$ oneimage create --name test.sh --path test.sh --datastore files --type CONTEXT
[one.image.allocate] Cannot parse image SIZE: File not found

Expected behavior
The error message should be more clear when the file the user is trying to register in the DS is NOT located in any of allowed dirs listed in the SAFE_DIR attributes. It may be worth to provide a recommendation on possible actions. So the full error message might be e.g. as below:

The file $file you are trying to register in the $DS datastore is NOT located in any of allowed directories listed in the SAFE_DIR attribute: <list all allowed dirs here>. Please, either copy/move your file to one of the SAFE_DIR or contact cloud system administrator to extend the list of safe directories with one you are trying to register the file from.

Details

• Affected Component: Datastore
• Version: 6.8.3

Progress Status

• Code committed
• Testing - QA
• Documentation (Release notes - resolved issues, compatibility, known issues)