Ruby-on-rails Capistrano 3 在目录中执行
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Capistrano 3 execute within a directory
提问by Rahul Sekhar
I'm trying to write a task for Capistrano 3 that involves executing 'composer install' within the directory of the current release. It looks something like this:
我正在尝试为 Capistrano 3 编写一个任务，该任务涉及在当前版本的目录中执行“composer install”。它看起来像这样：
namespace :composer do
desc 'Install dependencies with Composer'
task :install do
on roles(:web) do
within release_path do
execute "#{fetch(:composer_command)} install"
end
end
end
end
composer_commandis set in the staging and production files - in my particular case to php /home/user/composer.phar
composer_command设置在暂存和生产文件中 - 在我的特殊情况下 php /home/user/composer.phar
For some reason this command does not actually run in the current release directory, but instead runs in the parent directory (containing current, shared, releases, etc)
出于某种原因，这个命令实际上并没有在当前发布目录中运行，而是在父目录中运行（包含当前、共享、发布等）
I delved into this a bit further and found that when I ran a single word command, like:
我深入研究了一下，发现当我运行一个单词命令时，例如：
within release_path do
execute "pwd"
end
It works just fine, and runs the command in the current release directory. But...when I run a command with spaces, like:
它工作得很好，并在当前发布目录中运行命令。但是...当我运行带有空格的命令时，例如：
within release_path do
execute "pwd && ls"
end
It runs in the parent directory, and not the directory set by the withinblock.
它运行在父目录中，而不是within块设置的目录中。
Can someone shed some light on this? Thanks!
有人可以对此有所了解吗？谢谢！
回答by Electrawn
Smells like a Cap 3 bug.
闻起来像 Cap 3 臭虫。
I suggest just guaranteeing you are where you want to be from the shell perspective:
我建议从 shell 的角度保证你在你想要的地方：
execute "cd '#{release_path}'; #{fetch(:composer_command)} install"
回答by bricker
You can retain all the niceties of within(), with(), default_env, etc, while still keeping the natural string syntax:
你可以保留的所有细微之处within()，with()，default_env，等，同时仍保持自然字符串语法：
within release_path do
execute *%w[ pip install -r requirements.txt ]
end
回答by Jasper N. Brouwer
A couple of tips:
一些提示：
1) Capistrano uses SSHKitfor a lot of things, among which command execution. In order to simplify using Composer you could configure the command map (in deploy.rbor production.rb, etc), here are 2 examples:
1) Capistrano 使用SSHKit做很多事情，其中包括命令执行。为了简化 Composer 的使用，您可以配置命令映射（在deploy.rb或production.rb等中），这里有两个示例：
SSHKit.config.command_map[:composer] = "#{shared_path.join('composer.phar')}"
SSHKit.config.command_map[:composer] = '/usr/bin/env composer.phar'
Next you can execute it like so:
接下来你可以像这样执行它：
execute :composer, :install
2) From a security perspective it's wise to disable the php setting allow_url_fopen, but unfortunately Composer needs it enabled to function. You can use this trick to leave it disabled globally:
2) 从安全角度来看，禁用 php 设置是明智的allow_url_fopen，但不幸的是 Composer 需要启用它才能运行。您可以使用此技巧使其全局禁用：
SSHKit.config.command_map[:composer] = "/usr/bin/env php -d allow_url_fopen=On #{shared_path.join('composer.phar')}"
Check out iniscanfor more security advise on php settings.
查看iniscan以获取有关 php 设置的更多安全建议。
3) Composer has an option -d, --working-dir, which you can point to the directory containing the composer.jsonfile in order to run Composer from any other directory. This should solve your problem:
3) Composer 有一个选项-d, --working-dir，您可以指向包含该composer.json文件的目录，以便从任何其他目录运行 Composer。这应该可以解决您的问题：
execute :composer, '-d', release_path, :install
4) You may want to take a look at the capistrano-composerproject :)
4) 你可能想看看capistrano-composer项目:)
回答by JellicleCat
Actually, your use of the withinfunction is almostcorrect. You have supplied it an entire string as a command, but the doc points out that this results in unreliable behaviour (which I have experienced myself).
实际上，您对该within功能的使用几乎是正确的。您已将整个字符串作为命令提供给它，但文档指出这会导致不可靠的行为（我自己也经历过）。
Let the first argument to executebe a symbol instead of a string (which contains whitespace):
让第一个参数execute是一个符号而不是一个字符串（包含空格）：
within release_path do
execute fetch(:composer_command).to_sym, "install"
execute :pwd
execute :ls
end
回答by cdog
just for reference here is the Capistrano Docexplaining why within {}does not work with arguments with whitespace. I hope this helps.
仅供参考的是Capistrano Doc解释了为什么within {}不能使用带有空格的参数。我希望这有帮助。
