How to abort only function on error, but do not the script?

Question

I have the following script:

#!/bin/bash

set -e

function do_it {
    rm this-file-does-not-exit
    echo "Continuing ..."
    echo "Done ..."
    return 0
}

if do_it ; then
    echo "Success"
else
    echo "Error"
fi
echo "End of script"

Which produces:

rm: cannot remove 'this-file-does-not-exit': No such file or directory
Continuing ...
Done ...
Success
End of script

The function is not aborted because running the function in the if statement disables set -e for the function (and can not be enabled). This is not what I want.

Running the function outside the if statement, and collecting the result, is not possible, because in this situation the complete script is aborted if the function fails:

#!/bin/bash

set -e

function do_it {
    rm this-file-does-not-exit
    echo "Continuing ..."
    echo "Done ..."
    return 0
}

do_it
if $? ; then
    echo "Success"
else
    echo "Error"
fi
echo "End of script"

Produces:

rm: cannot remove 'this-file-does-not-exit': No such file or directory

I would like the following:

• the script aborts whenever a top-level command has a failure
• functions are aborted whenever a command has a failure. The return code of the failing command is returned as function return code
• failure in a function does not abort the script (only the function)

This can be implemented as follows:

#!/bin/bash

set -e

function do_it {
    rm this-file-does-not-exit || return $?
    echo "Continuing ..." || return $?
    echo "Done ..." || return $?
    return 0
}

if do_it ; then
    echo "Success"
else
    echo "Error"
fi
echo "End of script"

Which produces what I want:

rm: cannot remove 'this-file-does-not-exit': No such file or directory
Error
End of script

But this makes the implementation of the function completely unreadable: each line must be followed with a || return $?

Is there another way of aborting a function, and only the function, whenever an statement in the function fails?

Answer 1

我不太擅长 bash 脚本编写，需要付出很多努力才能实现我的以下想法，但我认为这应该可行：

• 实现一个功能
  • 它获取一个数组作为输入
  • 像您的示例一样，在失败时中断命令（作为字符串传递）
  • 返回一些内容，标识中断的位置以及原因（如果中断）
• 当你想要你所描述的行为时
• 构建您想要执行的命令的数组
• 将此数组传递给函数
• 处理响应