在Dockerfile中,如何更新PATH环境变量?

我有一个dockerfile从源代码下载和构建GTK,但下面这行没有更新我的映像的环境变量:

RUN PATH="/opt/gtk/bin:$PATH"
RUN export PATH

我读到我应该使用ENV来设置环境值,但下面的指令似乎也不起作用:

# EYZ0

这是我的整个Dockerfile:

FROM ubuntu
RUN apt-get update
RUN apt-get install -y golang gcc make wget git libxml2-utils libwebkit2gtk-3.0-dev libcairo2 libcairo2-dev libcairo-gobject2 shared-mime-info libgdk-pixbuf2.0-* libglib2-* libatk1.0-* libpango1.0-* xserver-xorg xvfb


# Downloading GTKcd
RUN wget http://ftp.gnome.org/pub/gnome/sources/gtk+/3.12/gtk+-3.12.2.tar.xz
RUN tar xf gtk+-3.12.2.tar.xz
RUN cd gtk+-3.12.2


# Setting environment variables before running configure
RUN CPPFLAGS="-I/opt/gtk/include"
RUN LDFLAGS="-L/opt/gtk/lib"
RUN PKG_CONFIG_PATH="/opt/gtk/lib/pkgconfig"
RUN export CPPFLAGS LDFLAGS PKG_CONFIG_PATH
RUN ./configure --prefix=/opt/gtk
RUN make
RUN make install


# running ldconfig after make install so that the newly installed libraries are found.
RUN ldconfig


# Setting the LD_LIBRARY_PATH environment variable so the systems dynamic linker can find the newly installed libraries.
RUN LD_LIBRARY_PATH="/opt/gtk/lib"


# Updating PATH environment program so that utility binaries installed by the various libraries will be found.
RUN PATH="/opt/gtk/bin:$PATH"
RUN export LD_LIBRARY_PATH PATH


# Collecting garbage
RUN rm -rf gtk+-3.12.2.tar.xz


# creating go code root
RUN mkdir gocode
RUN mkdir gocode/src
RUN mkdir gocode/bin
RUN mkdir gocode/pkg


# Setting the GOROOT and GOPATH enviornment variables, any commands created are automatically added to PATH
RUN GOROOT=/usr/lib/go
RUN GOPATH=/root/gocode
RUN PATH=$GOPATH/bin:$PATH
RUN export GOROOT GOPATH PATH
430712 次浏览

虽然冈特发布的答案是正确的,但它与我已经发布的答案并没有什么不同。问题不在于ENV指令,而在于随后的RUN export $PATH指令

不需要导出环境变量,只要你在Dockerfile中通过ENV声明了它们。

一旦删除了RUN export ...行,我的图像就成功构建了

您可以在Dockerfile中使用环境替代,如下所示:

ENV PATH="${PATH}:/opt/gtk/bin"

这是不鼓励的(如果你想创建/分发一个干净的Docker映像),因为PATH变量是由/etc/profile脚本设置的,这个值可以被覆盖。

# EYZ0:

if [ "`id -u`" -eq 0 ]; then
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
else
PATH="/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games"
fi
export PATH

在Dockerfile的末尾,你可以添加:

RUN echo "export PATH=$PATH" > /etc/environment

PATH为所有用户设置。

(# EYZ0)

应该指出的是

ENV PATH="/opt/gtk/bin:${PATH}"

可能不一样吗

ENV PATH="/opt/gtk/bin:$PATH"

前者带有花括号,可能为您提供主机的路径。文档并没有表明这是事实,但我观察到事实确实如此。这很容易检查,只需执行RUN echo $PATH并将其与RUN echo ${PATH}进行比较