为什么 PERL5LIB 环境变量在 `source $PERLBREW_ROOT/etc/bashrc` 之后消失了？

Question

在我的Dockerfile中我有下一个命令：

FROM perl:5.30.3-buster
...
RUN  env && source $PERLBREW_ROOT/etc/bashrc &&  env  &&  carton install

当执行 source $PERLBREW_ROOT/etc/bashrc 时，PERL5LIB 消失并且 carton 找不到 PERL5LIB 路径

指示的库

命令输出：

Step 18/22 : RUN  env && source $PERLBREW_ROOT/etc/bashrc &&  env  &&  carton install
 ---> Running in 358cb3aa042e
HOSTNAME=358cb3aa042e
PERL_VERSION=5.34.1
PERLBREW_HOME=/opt/perlbrew/home
PWD=/
HOME=/root
PERL5LIB=/opt/proj/lib:/opt/proj/local/lib/perl5:
SHLVL=1
PATH=/opt/perlbrew/bin:/opt/proj/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PERLBREW_ROOT=/opt/perlbrew
_=/usr/bin/env

HOSTNAME=358cb3aa042e
PERL_VERSION=5.34.1
PERLBREW_PATH=/opt/perlbrew/bin:/opt/perlbrew/perls/perl-5.34.1/bin
PERLBREW_HOME=/opt/perlbrew/home
PERLBREW_SHELLRC_VERSION=0.94
PWD=/
MANPATH=/opt/perlbrew/perls/perl-5.34.1/man:
PERLBREW_PERL=perl-5.34.1
HOME=/root
PERLBREW_VERSION=0.94
SHLVL=1
PATH=/opt/perlbrew/bin:/opt/perlbrew/perls/perl-5.34.1/bin:/opt/proj/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PERLBREW_ROOT=/opt/perlbrew
PERLBREW_MANPATH=/opt/perlbrew/perls/perl-5.34.1/man
_=/usr/bin/env

但是运行主机系统上的相同命令不会擦除 PERL5LIB:

(env | grep PERL) && source ~/perl5/perlbrew/etc/bashrc && (env | grep PERL)
PERLBREW_PATH=/home/kes/perl5/perlbrew/bin:/home/kes/perl5/perlbrew/perls/perl-5.30.3/bin
PERLBREW_HOME=/home/kes/.perlbrew
PERLBREW_SHELLRC_VERSION=0.89
PERLBREW_PERL=perl-5.30.3
PERLBREW=command perlbrew
PERLBREW_VERSION=0.89
PERL5LIB=xxx
PERLBREW_ROOT=/home/kes/perl5/perlbrew
PERLBREW_MANPATH=/home/kes/perl5/perlbrew/perls/perl-5.30.3/man
PERLBREW_PATH=/home/kes/perl5/perlbrew/bin:/home/kes/perl5/perlbrew/perls/perl-5.30.3/bin
PERLBREW_HOME=/home/kes/.perlbrew
PERLBREW_SHELLRC_VERSION=0.89
PERLBREW_PERL=perl-5.30.3
PERLBREW=command perlbrew
PERLBREW_VERSION=0.89
PERL5LIB=xxx
PERLBREW_ROOT=/home/kes/perl5/perlbrew
PERLBREW_MANPATH=/home/kes/perl5/perlbrew/perls/perl-5.30.3/man

请告诉我，在构建容器时运行来自 Docker 文件的命令有什么问题？

Answer 1

谢谢@ikegami

${PERLBREW_HOME:-}/init unset。当您在 perls 之间切换并且不希望它们的库相互混合时，这个 unset 是必需的。

例如，您使用的是 perl-5.24 并已将库安装到其 PERL5LIB 中，然后您切换到 perl-5.28，但 PERL5LIB 仍然指向由不同版本的 perl 安装的模块。这可能会导致核心转储。

为什么 PERL5LIB 环境变量在 `source $PERLBREW_ROOT/etc/bashrc` 之后消失了？

Why PERL5LIB env variable is disappeared after `source $PERLBREW_ROOT/etc/bashrc`?

perl

docker

dockerfile