https://github.com/devgateway/dkr2sh

Convert Dockerfile to shell script
https://github.com/devgateway/dkr2sh

bash bash-script converter docker dockerfile sed shell shell-script

Last synced: 3 months ago
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Convert Dockerfile to shell script

• Host: GitHub
• URL: https://github.com/devgateway/dkr2sh
• Owner: devgateway
• Created: 2018-09-26T17:23:05.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2022-02-23T11:32:18.000Z (over 3 years ago)
• Last Synced: 2024-04-15T15:31:30.247Z (over 1 year ago)
• Topics: bash, bash-script, converter, docker, dockerfile, sed, shell, shell-script
• Language: sed
• Size: 4.88 KB
• Stars: 24
• Watchers: 8
• Forks: 11
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

          
# dkr2sh - convert Dockerfile to shell script

This script naively translates some Dockerfile instructions into corresponding shell commands.

## Conversion Rules

### Instructions commented out

* FROM

* CMD

* LABEL

* MAINTAINER

* EXPOSE

* ENTRYPOINT

* VOLUME

* ARG

* ONBUILD

* STOPSIGNAL

* HEALTHCHECK

Translate these instructions manually:

* USER - execute the next block(s) with `su` or equivalent

* SHELL - unwrap JSON-formatted arguments, run it for subsequent block(s)

### ENV

Before:

    ENV FOO bar

After:

    export FOO=bar

### RUN

Before:

    RUN /usr/bin/foo \

        && /sbin/bar --quux

After:

    /usr/bin/foo \

        && /sbin/bar --quux

### COPY

`COPY` behaves differently on files and directories, so we use `rsync` to emulate *recursive

content copying* on directories.

If `--from` argument is given, it becomes just a comment, because unlike Docker images (and ogres),

shell scripts don't have layers.

Before:

    COPY --from=composer foo.sh /usr/local/bin/

After:

    for i in foo.sh; do

            test -d "$i" && i="$i/"

            rsync -a "$i" /usr/local/bin/ # --from=composer

    done

### WORKDIR

Before:

    WORKDIR /var/lib/pgsql/10.1

After:

    mkdir -p /var/lib/pgsql/10.1 && cd /var/lib/pgsql/10.1

### ADD

`ADD` has [many rules](https://docs.docker.com/v17.09/engine/reference/builder/#add), and transforms

into a fairly large snippet.

Before:

    ADD https://example.org/foo.bin /opt

After:

    if echo "/opt" | grep -q '/$'; then

            mkdir -p "/opt";

    else

            mkdir -p "$(dirname "/opt")";

    fi

    for i in https://example.org/foo.bin; do

            if echo "$i" | grep -q '^\(https\?\|ftp\)://'; then

                    if echo "/opt" | grep -q '/$'; then

                            (cd "/opt" && wget -q "$i");

                    else

                            wget -q -O "/opt" "$i";

                    fi

            elif test -d "$i"; then

                    rsync -a "$i/" "/opt";

            elif tar -tf "$i" >/dev/null 2>&1; then

                    mkdir -p "/opt" && tar -C "/opt" -xf "$i";

            else

                    rsync -a "$i" "/opt";

            fi

    done

## Copyright

Copyright 2018, Development Gateway

This program is free software: you can redistribute it and/or modify it under the terms of

the GNU General Public License as published by the Free Software Foundation, either version 3 of

the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without

even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See

the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not,

see .