Test fails in #MG5

Challenges
1

I’m doing the executables challenge (#MG5) and my tests fail when looking for /bin/cat. I looked at other posts but I couldn’t figure out what the issue was. I even put in code to resolve symlinks.

Here’s the relevant code, it works locally:

            // Resolve symlink to the actual file path (if it is a symlink)
            var resolvedPath = Directory.ResolveLinkTarget(dir, true);

            // check if we have a resolved path
            if (resolvedPath is null) continue;

            // Add the command to the resolved path
            string unixFilePath = Path.Combine(resolvedPath.FullName, command);

            // check if file name exists
            if (File.Exists(unixFilePath))
            {
                Console.WriteLine("file found");
                Console.WriteLine(unixFilePath);
                // check if file is executable
                var mode = File.GetUnixFileMode(unixFilePath);
                if (mode.HasFlag(UnixFileMode.UserExecute) || mode.HasFlag(UnixFileMode.GroupExecute) || mode.HasFlag(UnixFileMode.OtherExecute))
                {
                    return $"{command} is {dir}";
                }
            }

Test output:

remote: [compile]   Determining projects to restore...
remote: [compile]   All projects are up-to-date for restore.
remote: [compile]   codecrafters-shell -> /tmp/codecrafters-build-csharp/codecrafters-shell.dll
remote: [compile]
remote: [compile] Build succeeded.
remote: [compile]     0 Warning(s)
remote: [compile]     0 Error(s)
remote: ^[[33m[compile]
remote: [compile] Time Elapsed 00:00:03.08
remote: [compile] Moved ./.codecrafters/run.sh → ./your_program.sh
remote: [compile] Compilation successful.
remote: 
remote: [tester::#MG5] Running tests for Stage #MG5 (Locate executable files)
remote: [tester::#MG5] [setup] export PATH=/tmp/bee:$PATH
remote: [tester::#MG5] [setup] export PATH=/tmp/fox:$PATH
remote: [tester::#MG5] [setup] export PATH=/tmp/rat:$PATH
remote: [tester::#MG5] [setup] PATH is now: /tmp/rat:/tmp/fox:/tmp/bee:...
remote: [tester::#MG5] [setup] Available executables:
remote: [tester::#MG5] [setup] - my_exe
remote: [tester::#MG5] ^[[0mRunning ./your_program.sh
remote: [your-program] $ type cat
remote: [your-program] cat: not found
remote: [tester::#MG5] ^ Line does not match expected value.
remote: [tester::#MG5] Expected: "cat is /bin/cat"
remote: [tester::#MG5] Received: "cat: not found"
remote: [your-program] $
remote: [tester::#MG5] Assertion failed.
remote: [tester::#MG5] Test failed
2

Hi, thanks for your post!

I’m currently out of the office for the holidays and will be back on January 5. I’ll get back to you as soon as possible once I return.

4

The flag check looks fine since other passed it with UserExecute | UserRead. My guess would be your file exist condition fails. I am guessing the code is inside a loop over the PATHs and dir is one of those. But you only follow symlink from the PATH directory and not to the file, which you don’t append until after.

2 Likes
5

EDIT: I seem to have replied using my other account. Please excuse my error.

Thanks for the reply.

I tried to append the command to the dir path but it gave me the same error. I also skipped the whole symlink check and I still got the error.

I’m looking at the logs and I see the path includes pig, rat, fox but the tester is looking for cat which I don’t see mentioned in the PATH. Is this wrong or am I misunderstanding the testing process?

here’s my current code:

            // Combine the directory path with the command
            string unixFilePath = Path.Combine(dir, command);

            // check if file name exists
            if (!File.Exists(unixFilePath)) continue;

            // check if file is executable
            var mode = File.GetUnixFileMode(unixFilePath);
            if (mode.HasFlag(UnixFileMode.UserExecute) || mode.HasFlag(UnixFileMode.GroupExecute) || mode.HasFlag(UnixFileMode.OtherExecute))
            {
                return $"{command} is {unixFilePath}";
            }

and here’s the error which is identical to the previous log:

remote: [tester::#MG5] Running tests for Stage #MG5 (Locate executable files)
remote: [tester::#MG5] [setup] export PATH=/tmp/pig:$PATH
remote: [tester::#MG5] [setup] export PATH=/tmp/rat:$PATH
remote: [tester::#MG5] [setup] export PATH=/tmp/fox:$PATH
remote: [tester::#MG5] [setup] PATH is now: /tmp/fox:/tmp/rat:/tmp/pig:...
remote: [tester::#MG5] [setup] Available executables:
remote: [tester::#MG5] [setup] - my_exe
remote: [tester::#MG5] Running ./your_program.sh
remote: [your-program] $ type cat
remote: [your-program] cat: not found
remote: [tester::#MG5] ^ Line does not match expected value.
remote: [tester::#MG5] Expected: "cat is /bin/cat"
remote: [tester::#MG5] Received: "cat: not found"
remote: [your-program] $
remote: [tester::#MG5] Assertion failed.
remote: [tester::#MG5] Test failed
6

The tester likely extends the pre-existing PATH, so cat is expected at /bin/cat then /bin is already in PATH before the other directories are prepended.

From the fragment, all we can guess at for sure is either the File.Exists fail, or the mode.HasFlag check does. Have you tried removing the File.Exists which according to MSDN docs might fail if the file is not readable, and only using the HasFlag check?

Otherwise something must be wrong with dir. Are you splitting with Path.PathSeparator?

1 Like
7

Hey @analnaimi, if you need help with this, could you upload your code to GitHub and share the link? It will be much easier to debug if I can run it directly.

9

Closing this thread due to inactivity. If you still need assistance, feel free to reopen or start a new discussion!

10

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