如何使用 Composer 进行浅克隆？

Question

我得到了以下 composer.json:

{
    "require": {
        "php": ">=5.2.0",
        "queueit/KnownUser.V3.PHP": "dev-master"
    },
    "config": {
        "autoloader-suffix": "ComposerManager",
        "vendor-dir": "../../../all/libraries/composer"
    },
    "prefer-stable": true,
    "repositories": [
        {
            "type": "package",
            "package": {
                "name": "queueit/KnownUser.V3.PHP",
                "version": "dev-master",
                "source": {
                    "type": "git",
                    "url": "https://github.com/queueit/KnownUser.V3.PHP.git",
                    "reference": "master"
                }
            }
        }
    ]
}

然而当我运行:

$ composer -vvv update
...
Cloning master
Executing command (CWD): git clone --no-checkout 'https://github.com/queueit/KnownUser.V3.PHP.git' '.../sites/all/libraries/composer/queueit/KnownUser.V3.PHP' && cd '.../sites/all/libraries/composer/queueit/KnownUser.V3.PHP' && git remote add composer 'https://github.com/queueit/KnownUser.V3.PHP.git' && git fetch composer

克隆过程需要很长时间，存储库的大小增长超过 25MB：

$ du -hs ~/.composer/cache/vcs/https---github.com-queueit-KnownUser.V3.PHP.git/
25M ~/.composer/cache/vcs/https---github.com-queueit-KnownUser.V3.PHP.git/

然后 Composer 因超时而停止：

[Symfony\Component\Process\Exception\ProcessTimedOutException]
The process "git clone --no-checkout 'https://github.com/queueit/KnownUser.V3.PHP.git' '.../sites/all/libraries/composer/queueit/KnownUser.V3.PHP' && cd '.../sites/all/libraries/composer/queueit/KnownUser.V3.PHP' && git remote add composer 'https://github.com/queueit/KnownUser.V3.PHP.git' && git fetch composer" exceeded the timeout of 300 seconds.

我认为存储库太大，无法克隆所有 git 对象。

如何使用 a shallow clone 更快地克隆存储库？

例如，通过将额外的 --depth 1 或 --single-branch git 参数传递给 Git 命令，以便它可以被 Composer 自动拾取？

我希望更改在 composer.json 文件中是独立的，因此当运行ning composer install.

Answer 1

官方不支持使用 Composer 的浅克隆（没有任何补丁），因为 git 参数是硬编码的。

已经有一个添加此功能的请求：Add support for git shallow clones. However implementing this feature can cause some issues (such as not reaching the locked commits if the depth is not so high^@stof 和其他）。

此外还有一个pull request which attempts to implement shallow clones by adding an extra --git-clone-depth parameter (tests shows some good results). However the change has been abandon due to faster git clones using cache.

为了快速破解，可以在 src/Composer/Downloader/GitDownloader.php 中编辑 doDownload() 中的 git 参数，例如通过更改此行中的 --depth 1 --single-branch：

$command = 'git clone --no-checkout ...'

或者找到将深度 1 设置应用到 git 配置的方法。

对于更大的存储库，最简单的解决方法（没有任何技巧）就是通过指定如下变量来增加超时：

COMPOSER_PROCESS_TIMEOUT=0 composer install

如何使用 Composer 进行浅克隆？

How to perform shallow clone using Composer?

git

composer-php

shallow-clone