更新正在运行的bash文件 [英] Updating a running bash file

问题描述

我在bash脚本中具有以下功能.我们将此脚本称为 example.sh .它位于应该更新的git存储库中.

I have the following function in a bash script. Let's call this script example.sh. It's inside a git repository that should update.

example.sh (简化版)

# Directory of script
dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

update() {
  ( cd "$dir" && git pull )
}

if [ "$1" == "update" ]; then
  update
fi

然后我调用 example.sh update (调用该函数)，以便它执行 git pull .

Then I call example.sh update (which calls the function) so it executes the git pull.

现在的问题是，当 example.sh 中发生更改时，它需要自我更新.Linux没问题，但是GitBash(Windows ..)抱怨说:

Now the issue is when there's a change in example.sh, it needs to update itself. Linux has no problem doing that, but GitBash (Windows..) complains saying:

错误:无法创建文件example.sh:权限被拒绝

error: unable to create file example.sh: Permission denied

可能是因为它仍用于仍在运行 example.sh更新并等待 git pull 完成.

probably because it's in use for still running example.sh update and waiting for git pull to finish.

我已经尝试过

( cd "$dir" && git pull & )

和

bash -c "sleep 1 && cd \"$dir\" && git pull" &

如何触发新流程来更新此存储库，以便在 git pull ing时不使用任何文件?

How can I fire a new process to update this repo so that no files are in use at the moment of git pulling?

推荐答案

由于Windows缺少GitBash，因此我无法测试以下建议.如果您能给我一些反馈，我会很高兴.

For the lack of GitBash for Windows I wasn't able to test the following suggestion. I would be happy if you could give me some feedback.

在脚本的开头，添加

#! /bin/bash

self="$(sed '0,/^# ACTUALSCRIPT/d' "$BASH_SOURCE")"
exec bash -c "$self" "$0" "$@"
# ACTUALSCRIPT (keep this comment, the script relies on it)

# your old script
# ...

这将用新的 bash 进程替换脚本的进程，该进程从其参数而不是从文件中读取命令.

This will replace the script's process with a new bash process which reads commands from its arguments and not from a file.

请注意，您在 bash -c 内无法检测到脚本的目录.如果需要，可以将目录作为参数传递.或者，您可以 cd before exec ，这样新进程将在正确的目录中启动.

Please note that your detection of the script's directory probably won't work inside bash -c. You can pass the directory as an argument if needed. Alternatively, you can cd before exec such that the new process starts in the correct directory.

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