Dockerfile

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-FROM busybox
-ADD testfile.txt .
-RUN rm testfile.txt && mkdir app && echo "hello" > /app/othertestfile.txt
-

README.md

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-# Docker Artifact
-
-> Use docker image labels to identify which image layer contains a particular file, enabling retrieving just that file (well, the layer the file is in) from the image without needing to download the whole image.
-
-## Setup
-
-### Prerequisites
-
-Requires the `jq` and `curl` programs to be installed on your PATH.
-
-### Installation
-
-Download `docker-artifact.sh` file from this repository and install it at `~/.docker/cli-plugins/docker-artifact` (note the lack of `.sh` suffix) with execute permissions. Validate correct installation by observing the `artifact` command listed in `docker help`.
-
--OR-
-
-Run the following command in your shell:
-
-```bash
-mkdir -p ~/.docker/cli-plugins && \
-  curl https://raw.githubusercontent.com/infogulch/docker-artifact/master/docker-artifact.sh > ~/.docker/cli-plugins/docker-artifact && \
-  chmod +x ~/.docker/cli-plugins/docker-artifact && \
-  docker help | grep artifact > /dev/null && echo "Docker artifact install succeeded!" || echo "Docker artifact install failed :("
-```
-
-## Usage
-
-`docker artifact label [image] [file-path-1] [file-path-2] ...`
-
-Adds labels to an existing image enabling the `download` command below to pull just the layers that contain the file paths specified above.
-
-Note: `download` must download the whole layer; to optimize for artifact download size, add the target files to the image in a separate layer.
-
-`docker artifact download [image] [file-path-1] [file-path-2]`
-
-Downloads the image layers associated with the file paths specified and extracts them into the current directory.
-
-## See also
-
-Related to [timwillfixit's original `docker-artifact`](https://github.com/tomwillfixit/docker-artifact) in spirit, though not in history. The primary difference is that this uses a more precice strategy to search for files.
-

docker-artifact.sh

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-set -e
-
-verbose=1
-image="$1"
-export searchpath="$2"
-export tarfile="$(mktemp)-$image.tar"
-
-# Save image tar to temp file
-[ $verbose ] && >&2 echo "Exporting image '$image' to temp file '$tarfile'..."
-docker image save "$image" -o "$tarfile"
-
-# Set up cleanup to not leave image behind
-function onexit() {
-  [ $verbose ] && >&2 echo "Cleaning up exported image '$tarfile'"
-  rm "$tarfile"
-}
-trap onexit EXIT
-
-# Extract manifest and config file contents
-[ $verbose ] && >&2 echo "Collecting metadata from image..."
-manifest=$(tar -xf "$tarfile" -x manifest.json -O | jq)
-config_file=$(echo "$manifest" | jq -r '.[0].Config')
-config=$(tar -f "$tarfile" -x "$config_file" -O | jq)
-
-# Combine manifest.json and config json to build a map from tar layer directory to layer id sha
-export idmap=$(echo "$manifest" "$config" | jq -sr '[ [ .[0][0].Layers, .[1].rootfs.diff_ids ] | transpose[] | { (.[0]): .[1] } ] | reduce .[] as $x ({}; . * $x)')
-
-# Search each layer for a file matching $searchpath
-# TODO also search for related whiteout files that start with `.wh.`
-[ $verbose ] && >&2 echo "Searching layers for '$searchpath'..."
-found=$(echo "$manifest" | jq '.[0].Layers[]' | xargs -I {} sh -c 'digest=$(echo "$idmap" | jq -r ".[\"{}\"]"); tar -f "$tarfile" -x {} -O | tar -t | sed s_^_/_ | grep -wx "$searchpath" | xargs -I [] echo "[]=$digest"')
-
-# If more than one is found, then bail
-if [ $(echo "$found" | wc -l) -gt 1 ]; then
-	>&2 echo "Multiple matches found, aborting:"
-	>&2 echo "$found"
-	exit 2
-fi
-
-# print out labels to add during image rebuild
-labels=$(echo "$found" | sed 's_^.*$_--label "\0"_' | paste -d' ')
-
-echo "$labels"
-
-
-[ $verbose ] && >&2 echo "Done!"
-exit
-

testfile.txt

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-hi