在alpine linux上冲刺（在docker中）

我正在尝试将dash安装在（停靠的）alpine linux中。 我的Dockerfile如下：

FROM alpine:latest

RUN \
    echo "@community http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories && \
    apk add --no-cache --update dash
ENV SHELL dash

CMD dash

我得到的输出：

Step 1/4 : FROM alpine:latest
 ---> 053cde6e8953
Step 2/4 : RUN echo "@community http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories &&     apk add --no-cache --update dash
 ---> Running in 680f3d4d7dda
fetch http://dl-cdn.alpinelinux.org/alpine/v3.6/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.6/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.6/community/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.6/community/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz
ERROR: unsatisfiable constraints:
  dash-0.5.9.1-r0:
    masked in: @community
    satisfies: world[dash]
ERROR: Service 'dash_alpine' failed to build: The command '/bin/sh -c echo "@community http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories &&     apk add --no-cache --update dash' returned a non-zero code: 1

然而，基于alpine linux软件包搜索，社区repo中似乎提供了该软件包：

---

我应该做什么改变才能让它工作

我认为你的

echo

行是错的。
这个文件对我很有用

FROM alpine:edge
RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories \
&& apk add -U --no-cache dash