Composer忽略$COMPOSER_HOME

Question

我为composer设置了环境变量，但它仍然安装在默认目录(~/.composer)中。如果我做错了什么，有人能告诉我吗？

distPoint /var/www/html/laravel # COMPOSER_HOME="/opt/composer/"
distPoint /var/www/html/laravel # echo $COMPOSER_HOME
/opt/composer/
distPoint /var/www/html/laravel # composer global require "laravel/installer=~1.1"
Changed current directory to /root/.composer
./composer.json has been created
Loading composer repositories with package information
Updating dependencies (including require-dev)
  - Installing symfony/process (v2.6.6)
    Downloading: 100%         

  - Installing symfony/console (v2.6.6)
    Downloading: 100%         

  - Installing guzzlehttp/streams (2.1.0)
    Downloading: 100%         

  - Installing guzzlehttp/guzzle (4.2.3)
    Downloading: 100%         

  - Installing laravel/installer (v1.2.0)
    Downloading: 100%         

symfony/console suggests installing symfony/event-dispatcher ()
symfony/console suggests installing psr/log (For using the console logger)
guzzlehttp/guzzle suggests installing ext-curl (Guzzle will use specific adapters if cURL is present)
Writing lock file
Generating autoload files
distPoint /var/www/html/laravel # ls ~/.composer/
cache  composer.json  composer.lock  vendor
distPoint /var/www/html/laravel # ls /opt/composer/
distPoint /var/www/html/laravel # 

Answer 1

使用此inseead：

export COMPOSER_HOME=/opt/composer

它使变量对子进程可用。