Capistrano 不服从 "within release_path"

Question

我有这个任务:

namespace :custom do
  desc "create a symlink to db config already on the server"
  task :symlink_db_config do
    on roles(:web) do
      within release_path do
        execute "pwd"
      end

      within release_path do
        execute "ln -nfs /home/blog/config/database.yml ./database.yml"
      end
    end
  end
end

出于某些令人气愤的原因，pwd命令前面是 cd到发布路径，但 ln命令不是。这是为什么？

这是输出，显示了上面的内容:

** Invoke custom:symlink_db_config (first_time)
** Execute custom:symlink_db_config
DEBUG[352cc4bb] Running /usr/bin/env if test ! -d /home/blog/staging/releases/20141010050707; then echo "Directory does not exist '/home/blog/staging/releases/20141010050707'" 1>&2; false; fi on 172.245.32.193
DEBUG[352cc4bb] Command: if test ! -d /home/blog/staging/releases/20141010050707; then echo "Directory does not exist '/home/blog/staging/releases/20141010050707'" 1>&2; false; fi
DEBUG[352cc4bb] Finished in 0.199 seconds with exit status 0 (successful).

// Here's the `pwd`; note the proper `cd` that occurs first:

INFO[67a83a04] Running /usr/bin/env pwd on 172.245.32.193
DEBUG[67a83a04] Command: cd /home/blog/staging/releases/20141010050707 && /usr/bin/env pwd
DEBUG[67a83a04]     /home/blog/staging/releases/20141010050707
INFO[67a83a04] Finished in 0.268 seconds with exit status 0 (successful).
DEBUG[f46f64b3] Running /usr/bin/env if test ! -d /home/blog/staging/releases/20141010050707; then echo "Directory does not exist '/home/blog/staging/releases/20141010050707'" 1>&2; false; fi on 172.245.32.193
DEBUG[f46f64b3] Command: if test ! -d /home/blog/staging/releases/20141010050707; then echo "Directory does not exist '/home/blog/staging/releases/20141010050707'" 1>&2; false; fi
DEBUG[f46f64b3] Finished in 0.243 seconds with exit status 0 (successful).

//And now here's the `ln`... but where is the `cd`?  I said `within release_path`, didn't I?

INFO[afdbd89c] Running /usr/bin/env ln -nfs /home/blog/config/database.yml ./database.yml on 172.245.32.193
DEBUG[afdbd89c] Command: ln -nfs /home/blog/config/database.yml ./database.yml
INFO[afdbd89c] Finished in 0.219 seconds with exit status 0 (successful).

所以我的 ln失败，因为它不在正确的目录中。为什么没有 capistrano cd像我说的那样进入发布目录？

(顺便说一下，Capistrano 3.2.1)

Answer 1

另一个答案中有有用的信息 here但简而言之，当您要运行的命令中有空格时，似乎会出现问题。

我遵循了砖家的建议，例如

within release_path do
  execute *%w[ ln -nfs /home/blog/config/database.yml ./database.yml ]
end