nixpkgs/pkgs/build-support/fetchdocker/fetchdocker-builder.sh
Parnell Springmeyer 25865688a7
docker: init fetchdocker nix code for docker2nix
This change adds granular, non-docker daemon docker image fetchers and
a docker image layer compositor to be used in conjunction with the
`docker2nix` utility provided by the `haskellPackages.hocker` package.

This change includes a hackage package version bump and updated sha256
for recent fixes released to `hocker` resulting from formulating this
patch.
2017-12-01 21:00:52 -06:00

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source "${stdenv}/setup"
header "exporting ${repository}/${imageName} (tag: ${tag}) into ${out}"
mkdir -p "${out}"
cat <<EOF > "${out}/compositeImage.sh"
#! ${bash}/bin/bash
#
# Create a tar archive of a docker image's layers, docker image config
# json, manifest.json, and repositories json; this streams directly to
# stdout and is intended to be used in concert with docker load, i.e:
#
# ${out}/compositeImage.sh | docker load
# The first character follow the 's' command for sed becomes the
# delimiter sed will use; this makes the transformation regex easy to
# read. We feed tar a file listing the files we want in the archive,
# because the paths are absolute and docker load wants them flattened in
# the archive, we need to transform all of the paths going in by
# stripping everything *including* the last solidus so that we end up
# with the basename of the path.
${gnutar}/bin/tar \
--transform='s=.*/==' \
--transform="s=.*-manifest.json=manifest.json=" \
--transform="s=.*-repositories=repositories=" \
-c "${manifest}" "${repositories}" -T "${imageFileStorePaths}"
EOF
chmod +x "${out}/compositeImage.sh"
stopNest