错误合并/注释-命令

Question

在尝试使用Composer安装Drush时，我得到了一个有关合并/注释-命令的错误。“锁定在2.0.3”和“要求2.8.1”是什么意思？

这是一个错误：

Your requirements could not be resolved to an installable set of packages.

  Problem 1

- Installation request for drush/drush dev-master -> satisfiable by drush/drush[dev-master].
- Conclusion: remove consolidation/annotated-command 2.0.3
- Conclusion: don't install consolidation/annotated-command 2.0.3
- drush/drush dev-master requires consolidation/annotated-command ^2.8.1 -> satisfiable by consolidation/annotated-command[2.8.1, 2.8.2].
- Can only install one of: consolidation/annotated-command[2.8.1, 2.0.3].
- Can only install one of: consolidation/annotated-command[2.8.2, 2.0.3].
- Installation request for consolidation/annotated-command (locked at 2.0.3) -> satisfiable by consolidation/annotated-command[2.0.3].

Installation failed, reverting ./composer.json to its original content.

Answer 1

在我的composer.json中将drush/drush的最小版本更改为D1，然后运行composer update drush/drush之后，我会得到这个错误。

我只是通过执行composer require drush/drush:~9.0来解决这个问题，这导致了错误消息drush/drush 9.5.x-dev requires symfony/config ^3.4，所以在composer require drush/drush:~9.0能够成功完成之前，我必须执行composer require symfony/config:^3.4。

不知道这是否是解决这种依赖冲突的唯一方法或最佳实践，但简而言之，这对我是有效的：

1. composer require symfony/config:^3.4
2. composer require drush/drush:~9.0