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Add explicit docker-entrypoint to comply with official image rules #10

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4bc05a5
Add explicit docker-entrypoint to comply with official image rules
l-lotz Dec 7, 2018
47e43c7
Dockerfile: only install openssh client, use apk --no-cache
l-lotz Mar 25, 2019
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8 changes: 4 additions & 4 deletions Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -2,12 +2,12 @@ FROM alpine

LABEL maintainer Bill Wang <ozbillwang@gmail.com>

RUN apk --update add git less openssh && \
rm -rf /var/lib/apt/lists/* && \
rm /var/cache/apk/*
COPY docker-entrypoint.sh /docker-entrypoint.sh

RUN apk --update --no-cache add git less openssh-client

VOLUME /git
WORKDIR /git

ENTRYPOINT ["git"]
ENTRYPOINT ["/docker-entrypoint.sh"]
CMD ["--help"]
18 changes: 18 additions & 0 deletions docker-entrypoint.sh
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@@ -0,0 +1,18 @@
#!/bin/sh

# A beginning user should be able to docker run image bash (or sh) without
# needing to learn about --entrypoint
# https://github.com/docker-library/official-images#consistency

set -e

# run command if it is not starting with a "-", is not a git subcommand and is an executable in PATH
if [ "${#}" -gt "0" ] && \
[ "${1#-}" == "${1}" ] && \
[ ! -x "/usr/libexec/git-core/git-${1}" ] && \
command -v "${1}" > /dev/null 2>&1 ; then
exec "${@}"
else
# else default to run command with git
exec git "${@}"
fi