NSTask 没有从用户环境中获取 $PATH [英] NSTask not picking up $PATH from the user's environment

问题描述

我不知道为什么这个方法返回一个空字符串:

I don't know why this method returns a blank string:

- (NSString *)installedGitLocation {
    NSString *launchPath = @"/usr/bin/which";

    // Set up the task
    NSTask *task = [[NSTask alloc] init];
    [task setLaunchPath:launchPath];
    NSArray *args = [NSArray arrayWithObject:@"git"];
    [task setArguments:args];

    // Set the output pipe.
    NSPipe *outPipe = [[NSPipe alloc] init];
    [task setStandardOutput:outPipe];

    [task launch];

    NSData *data = [[outPipe fileHandleForReading] readDataToEndOfFile];
    NSString *path = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];

    return path;
}

如果不是传递 @"git" 作为参数，我传递 @"which" 我得到 /usr/bin/which按预期返回.所以至少原理是有效的.

If instead of passing @"git" as the argument, I pass @"which" I get /usr/bin/which returned as expected. So at least the principle works.

来自终端

$ which which
$ /usr/bin/which
$
$ which git
$ /usr/local/git/bin/git

所以它在那里工作.

我唯一能想到的是 which 没有搜索我环境中的所有路径.

The only thing I can think of is that which isn't searching through all the paths in my environment.

这让我发疯！有人有什么想法吗?

This is driving me crazy! Does anyone have any ideas?

这看起来是关于设置 NSTask 或用户的 shell(例如，~/.bashrc)，以便 NSTask 看到正确的环境($PATH).>

It looks like this is about setting up either NSTask or the user's shell (e.g., ~/.bashrc) so that the correct environment ($PATH) is seen by NSTask.

推荐答案

通过 NSTask 运行任务使用 fork() 和 exec() 来实际运行任务.根本不涉及用户的交互式 shell.由于 $PATH(大体上)是一个 shell 概念，因此当您谈论以其他方式运行进程时，它并不适用.

Running a task via NSTask uses fork() and exec() to actually run the task. The user's interactive shell isn't involved at all. Since $PATH is (by and large) a shell concept, it doesn't apply when you're talking about running processes in some other fashion.

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