无法通过golang exec.Command()将参数传递给bash脚本。

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英文:

Cannot pass argument to bash script through golang exec.Commad()

问题

我正在尝试通过一个Golang程序将参数传递给一个bash脚本,但是我在bash脚本正确接收参数方面遇到了问题。

Golang函数:

func testLink(link string) {
    stdout, err := exec.Command("/bin/sh", "-c", "./test.sh", link).Output()

    if err != nil {
        log.Fatalf("Error running test script: %s", err)
    }
    fmt.Println(string(stdout))
}

该函数调用以下bash脚本:

#!/bin/sh

LINK=${@:$OPTIND:1}

if [[ -z "$LINK" ]]; then
    echo "The link is required"
    exit 1
fi

PARSED_LINK=$(echo $LINK | awk '{split($0,a,"/"); print a[5]}')

#do some other actions

我可以顺利运行脚本,并获得预期的输出。然而,在运行Golang代码时:

$ go run main.go test https://github.com/test/test
2021/12/28 20:48:02 Error running test script: exit status 1
exit status 1

我如何将参数传递给bash脚本:go run main.go function argument

此外,我知道它在接收参数时失败,因为如果我更改if段中的退出代码,go可执行文件的输出也会发生变化。

英文:

I am trying to pass an argument to a bash script, via a golang progam, but I'm having issues with the bash script properly recieving the argument.

Golang function:

func testLink(link string) {
    stdout, err := exec.Command("/bin/sh", "-c", "./test.sh", link).Output()

    if err != nil {
	    log.Fatalf("Error running test script: %s", err)
    }
    fmt.Println(string(stdout))
}

Which calls the following bash script:

#!/bin/sh

LINK=${@:$OPTIND:1}

if [[ -z "$LINK" ]]; then
    echo "The link is required"
    exit 1
fi

PARSED_LINK=$(echo $LINK | awk '{split($0,a,"/"); print a[5]}')

#do some other actions

I can run the script no problem, and I get the expected output. However, upon running the golang code:

$ go run main.go test https://github.com/test/test
2021/12/28 20:48:02 Error running test script: exit status 1
exit status 1

How do I pass the argument in: go run main.go function argument to the bash script?

Additionaly, I know it fails with the receiving argument, because if I change the exit code in the if segment, the output from the go executable changes.

答案1

得分: 3

要传递参数,你需要删除-c,否则它们将被视为sh可执行文件的参数,而不是你的脚本。

cmd := exec.Command("/bin/sh", "./test.sh", link)

我猜你的问题还在于你如何编写你的shell脚本。那个变量赋值看起来很奇怪。shellcheck 在下面的第2行报告了这个问题。

将数组分配给字符串!分配为数组,或者使用*而不是@进行连接。shellcheck(SC2124)
在POSIX sh中,字符串索引是未定义的。shellcheck(SC3057)

当我尝试像你那样通过shell执行带有参数的脚本时,我会得到一个错误。

#!/bin/sh
LINK=${@:$OPTIND:1}
echo "$LINK"
$ ./test.sh foo
./test.sh: 2: Bad substitution

我建议改为像这样分配变量。

#!/bin/sh
LINK="$1"
...
英文:

For the arguments to be passed, you need to remove the -c otherwise they are treated as argument to the sh executable rather than your script.

cmd := exec.Command("/bin/sh", "./test.sh", link)

I guess additionally your problem is how you wrote your shell script. That variable assignment looks odd. shellcheck reports this at line 2 below.

> Assigning an array to a string! Assign as array, or use * instead of @ to concatenate. shellcheck(SC2124)
In POSIX sh, string indexing is undefined. shellcheck(SC3057)

When I try to execute a script with the argument set like you did via shell, I get an error.

#!/bin/sh
LINK=${@:$OPTIND:1}
echo "$LINK"
$ ./test.sh foo
./test.sh: 2: Bad substitution

I suggest assigning the variable like this instead.

#!/bin/sh
LINK="$1"
...

huangapple
  • 本文由 发表于 2021年12月29日 05:01:13
  • 转载请务必保留本文链接:https://go.coder-hub.com/70512444.html
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