Powershell、反斜杠和向Docker发送命令

这在一定程度上与PowerShell有关，但我有一个我正在努力解决的边缘案例，这可能是因为我缺乏PowerShell知识

我有一个PowerShell脚本，它需要在

docker run

命令中选择性地包含

-v

选项

以下是脚本：

$pwd = (Get-Location)

# If GEM_HOME is declared, see if it is in the current directory. If not, we need
# to volume-mount it and change the variable value.
$gem_mount_cmd = ""
$gem_env_var = "-e GEM_HOME"
if (Test-Path env:GEM_HOME)
{
    $gem_home = $env:GEM_HOME
    $parent = (Split-Path -parent $gem_home)
    if ((Join-Path $parent '') -ne $pwd)
    {
        $gem_mount_cmd = "-v ""`$('$parent' -replace '\\','/'):/gems"""
        $gem_env_var = "-e GEM_HOME='/gems/"+(Split-Path -leaf $gem_home)+"'"
    }
}

$cmd = "& docker run --rm -it $gem_env_var $gem_mount_cmd -v ${pwd}:/srv alpine bash"
Write-Output $cmd
& $cmd

目前，运行该脚本将导致PowerShell错误，即关于

docker run

的错误不会被识别为cmdlet、函数、脚本文件或可操作程序的名称

我也试过：

& docker run --rm -it $gem_env_var $gem_mount_cmd -v ${pwd}:/srv alpine bash

这给了我一个Docker错误，抱怨“未知速记标志：'r'in-replace”

我还尝试将

$gem\u mount\u cmd

的赋值替换为：

$gem_mount_cmd = "-v $($parent -replace '\\','/'):/gems"

但这让我回到了“来自守护进程的错误响应：无效模式”错误，链接问题的OP遇到了这个错误

我还阅读并修改了脚本：

$pwd = (Get-Location)

# If GEM_HOME is declared, see if it is in the current directory. If not, we need
# to volume-mount it and change the variable value.
$gem_mount_cmd = ""
$gem_env_var = "-e GEM_HOME"
if (Test-Path env:GEM_HOME)
{
    $gem_home = $env:GEM_HOME
    $parent = (Split-Path -parent $gem_home)
    if ((Join-Path $parent '') -ne $pwd)
    {
        $gem_mount_cmd = "-v $($parent -replace '\\','/'):/gems"
        $gem_env_var = "-e GEM_HOME='/gems/"+(Split-Path -leaf $gem_home)+"'"
    }
}

$params = 'run', '--rm', '-it',
          $gem_env_var, $gem_mount_cmd, '-v ${pwd}:/srv',
          'alpine', 'bash'
& docker @params

但这给了我同样的Docker“无效模式”错误

我需要做什么才能让它工作？我认为一个选项是让脚本嵌入两个不同版本的

docker run

命令，例如：

$pwd = (Get-Location)

# If GEM_HOME is declared, see if it is in the current directory. If not, we need
# to volume-mount it and change the variable value.
$gem_mount_cmd = ""
$gem_env_var = "-e GEM_HOME"
if (Test-Path env:GEM_HOME)
{
    $gem_home = $env:GEM_HOME
    $parent = (Split-Path -parent $gem_home)
    if ((Join-Path $parent '') -ne $pwd)
    {
        $gem_mount_cmd = "-v $($parent -replace '\\','/'):/gems"
        $gem_env_var = "-e GEM_HOME='/gems/"+(Split-Path -leaf $gem_home)+"'"
    }
}

if ("$gem_mount_cmd" -ne "") {
    & docker run --rm -it $gem_env_var -v "$($parent -replace '\\','/'):/gems" -v ${pwd}:/srv alpine bash
}
else {
    & docker run --rm -it -v ${pwd}:/srv alpine bash
}

---

但感觉一定有更好的方法…

我会动态构建参数数组，然后在命令上显示它：

$params = 'run', '--rm', '--it'
if (Test-Path env:GEM_HOME) {
    $params += '-e', "GEM_HOME='/gems/$(Split-Path -Leaf $gem_home)'",
               '-v', "$($parent -replace '\\', '/'):/gems"
}
$params += '-v', "${pwd}:/srv", 'alpine', 'bash'

& 'docker.exe' @params

---

尝试有条件地将值附加到

$params

数组<代码>$params='run'、'-rm'、'-it'；if（测试路径env:GEM_HOME）{$params+='-e'，“GEM_HOME='/gems/$（拆分路径-Leaf$GEM_HOME）'，'-v'，（$parent-replace'\\'，'/'）$参数+='-v'，“${pwd}:/srv”，“alpine”，“bash”谢谢，@AnsgarWiechers。有一个小的输入错误-“$（$parent-replace'\\'，'/'）：/gems”，但现在可以了。