"Launch path not accessible" using NSTask to create Git commit

Question

I am trying to use NSTask to create a Git commit and to add a message to that commit.

This is the code I have tried.

NSString *projectPath = @"file:///Users/MYNAME/Desktop/MYPROJECT/";
//stage files
NSPipe *pipe = [NSPipe pipe];
NSTask *task = [[NSTask alloc] init];
task.launchPath = projectPath;
task.arguments = @[@"git", @"add", @"."];
task.standardOutput = pipe;
[task launch];

//commit
NSPipe *pipe2 = [NSPipe pipe];
NSTask *task2 = [[NSTask alloc] init];
task2.launchPath = projectPath;
task2.arguments = @[@"git", @"commit", @"-m",@"\"Some Message\""];
task2.standardOutput = pipe2;
[task2 launch];

I received projectPath by using NSOpenPanel (standard OS X open dialog).

In the Xcode terminal, I get the message "launch path not accessible"

So what am I doing wrong?

Update After comment from Josh Caswell this is my code

NSString *projectPath = @"file:///Users/MYNAME/Desktop/MYPROJECT/";
NSString *gitPath = @"/usr/local/bin/git"; //location of the GIT on my mac

//stage
NSPipe *pipe = [NSPipe pipe];
NSTask *task = [[NSTask alloc] init];
task.launchPath = gitPath;
task.currentDirectoryPath = projectPath;
task.arguments = @[@"add", @"."];
task.standardOutput = pipe;
[task launch];

After [task launch]; I get error message in terminal "working directory doesn't exist."

Answer 1

The task's launchPath is the path to the program you want to run: that's Git here, so that path probably needs to be /usr/local/bin/git. And remove @"git" from the arguments; it's not an argument, it's the executable.

The path to your project should be used for the task's currentDirectoryPath so that it has the correct working directory.

Answer 2

With the pointers from Josh Casswell's answer I managed to figure it out. I found out that I have to remove the file:// part from the projectPath. So project path should be @"/Users/MYNAME/Desktop/MYPROJECT/".

Also it should not contain spaces because it does not work with %20 escape character. Which is kind of strange because when you use NSOpenPanel you get NSURL and when you call absolute path on it you get the "file://" at the start and "%20" instead of spaces inside of the path.

TLDR; This code works in Xcode 8:

NSString *projectPath = @"/Users/MYNAME/Desktop/MYPROJECT/"; //be careful that it does not contain %20
NSString *gitPath = @"/usr/local/bin/git";
NSString *message = @"this is commit message";

//stage
NSPipe *pipe = [NSPipe pipe];
NSTask *task = [[NSTask alloc] init];
task.launchPath = gitPath;
task.currentDirectoryPath = projectPath;
task.arguments = @[@"add", @"."];
task.standardOutput = pipe;
[task launch];
[task waitUntilExit];

//commit
NSPipe *pipe2 = [NSPipe pipe];
NSTask *task2 = [[NSTask alloc] init];
task2.launchPath = gitPath;
task2.currentDirectoryPath = projectPath;
task2.arguments = @[@"commit", @"-m", message];
task2.standardOutput = pipe2;
[task2 launch];
[task2 waitUntilExit];

Update Add [task waitUntilExit]; if you keep getting the message

fatal: Unable to create '/Users/MYNAME/Desktop/MYPROJECT/.git/index.lock': File exists.

Another git process seems to be running in this repository, e.g. an editor opened by 'git commit'. Please make sure all processes are terminated then try again. If it still fails, a git process may have crashed in this repository earlier: remove the file manually to continue.