pkgs/build-support/fetchdocker/fetchdocker-builder.sh

   1 if [ -e "$NIX_ATTRS_SH_FILE" ]; then . "$NIX_ATTRS_SH_FILE"; elif [ -f .attrs.sh ]; then . .attrs.sh; fi
   2 source "${stdenv}/setup"
   3 echo "exporting ${repository}/${imageName} (tag: ${tag}) into ${out}"
   4 mkdir -p "${out}"
   5
   6 cat <<EOF > "${out}/compositeImage.sh"
   7 #! ${bash}/bin/bash
   8 #
   9 # Create a tar archive of a docker image's layers, docker image config
  10 # json, manifest.json, and repositories json; this streams directly to
  11 # stdout and is intended to be used in concert with docker load, i.e:
  12 #
  13 # ${out}/compositeImage.sh | docker load
  14
  15 # The first character follow the 's' command for sed becomes the
  16 # delimiter sed will use; this makes the transformation regex easy to
  17 # read. We feed tar a file listing the files we want in the archive,
  18 # because the paths are absolute and docker load wants them flattened in
  19 # the archive, we need to transform all of the paths going in by
  20 # stripping everything *including* the last solidus so that we end up
  21 # with the basename of the path.
  22 ${gnutar}/bin/tar \
  23   --transform='s=.*/==' \
  24   --transform="s=.*-manifest.json=manifest.json=" \
  25   --transform="s=.*-repositories=repositories=" \
  26   -c "${manifest}" "${repositories}" -T "${imageFileStorePaths}"
  27 EOF
  28 chmod +x "${out}/compositeImage.sh"