minideb/import at add-template · adeelahmad/minideb

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#!/bin/bash

# Import a tarball as a docker image, specifying the desired image

# creation date.

# This is useful as there's no other way to manipulate the creation

# date, and the date is part of the calculation of the image id.

# This means that the only way to reproduce an image is to specify

# the same timestamp.

set -e

set -u

set -o pipefail

SOURCE=${1:?Specify the tarball to import}

TIMESTAMP=${2:?Specify the timestamp to use}

PLATFORM=${3:?Specify the target platform}

CONF_TEMPLATE='{"architecture":"%PLATFORM%","comment":"from Bitnami with love","config":{"Hostname":"","Domainname":"","User":"","AttachStdin":false,"AttachStdout":false,"AttachStderr":false,"Tty":false,"OpenStdin":false,"StdinOnce":false,"Env":null,"Cmd":["/bin/bash"],"Image":"","Volumes":null,"WorkingDir":"","Entrypoint":null,"OnBuild":null,"Labels":null},"container_config":{"Hostname":"","Domainname":"","User":"","AttachStdin":false,"AttachStdout":false,"AttachStderr":false,"Tty":false,"OpenStdin":false,"StdinOnce":false,"Env":null,"Cmd":null,"Image":"","Volumes":null,"WorkingDir":"","Entrypoint":null,"OnBuild":null,"Labels":null},"created":"%TIMESTAMP%","docker_version":"1.13.0","history":[{"created":"%TIMESTAMP%","comment":"from Bitnami with love"}],"os":"linux","rootfs":{"type":"layers","diff_ids":["sha256:%LAYERSUM%"]}}'

MANIFEST_TEMPLATE='[{"Config":"%CONF_SHA%.json","RepoTags":null,"Layers":["%LAYERSUM%/layer.tar"]}]'

import() {

local TDIR="$(mktemp -d)"

local LAYERSUM="$(sha256sum $SOURCE | awk '{print $1}')"

mkdir $TDIR/$LAYERSUM

cp $SOURCE $TDIR/$LAYERSUM/layer.tar

echo -n '1.0' > $TDIR/$LAYERSUM/VERSION

local CONF="$(echo -n "$CONF_TEMPLATE" | sed -e "s/%PLATFORM%/$PLATFORM/g" -e "s/%TIMESTAMP%/$TIMESTAMP/g" -e "s/%LAYERSUM%/$LAYERSUM/g")"

local CONF_SHA="$(echo -n "$CONF" | sha256sum | awk '{print $1}')"

echo -n "$CONF" > "$TDIR/${CONF_SHA}.json"

local MANIFEST="$(echo -n "$MANIFEST_TEMPLATE" | sed -e "s/%CONF_SHA%/$CONF_SHA/g" -e "s/%LAYERSUM%/$LAYERSUM/g")"

echo -n "$MANIFEST" > $TDIR/manifest.json

tar cf $TDIR/import.tar -C $TDIR manifest.json "${CONF_SHA}.json" "$LAYERSUM"

local ID=$(docker load -i $TDIR/import.tar | awk '{print $4}')

if [ "$ID" != "sha256:$CONF_SHA" ]; then

echo "Failed to load $ID correctly, expected id to be $CONF_SHA, source in $TDIR" >&2

exit 1

rm -r "$TDIR"

echo $ID

}

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