Set Executable File

[omkarjagtap1011]

Summary

This PR adds the ability to use a custom rclone executable path instead of relying solely on the system PATH.

Changes

New set_executable_file() Function

• Allows users to specify a custom path to the rclone executable
• Includes an optional validate parameter (default: True) to verify the executable path exists
• Raises FileNotFoundError if the path does not exist and validation is enabled
• Validation can be bypassed with validate=False for advanced use cases

Updated is_installed()

• Previously only checked whether rclone was available in the system PATH
• Now also returns True if a valid custom executable path has been configured via set_executable_file()
• Ensures functions decorated with @__check_installed work correctly when using a custom executable

Tests Added

• test_set_executable_file()
  Verifies that the custom executable path is correctly stored

• test_default_executable_path()
  Confirms the default executable is "rclone"

• test_set_executable_file_validation()
  Tests executable path validation behavior

• test_is_installed_with_custom_executable()
  Ensures is_installed() works correctly with a custom executable path

• test_executable_used_in_command()
  Confirms that the custom executable is actually used when running rclone commands

[Johannes11833]

Looks good.
Could you adapt the set_executable_file test so that it runs in the automated tests? Maybe using which to get the directory that rclon is installed in? What do you think?

[omkarjagtap1011]

I have check the error.

It is occuring because the test_set_executable.py contains the CUSTOM_PATH variable, which is the custom path where we want to keep the rclone binary. Currently, this path doesn't exists ( was present in my environment). Hence, test fails.

Solution Algorithm:-

1. Create a temporary directory.
2. Download and extract rclone binary in that directory.
3. Perform the test where CUSTOM_PATH will point to rclone present in that temp dir.
4. After testing, delete the temp dir.

Please review this.

[Johannes11833]

Looks good 👍
I noticed that the temp dirs are not directly removed but rather the last 3 runs are kept, but that is fine in my opinion.
I will do the code formatting once this PR is merged.