helpers2.1: vendor is a symlink to the folder in parent

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Alexandre Aubin 2024-06-08 17:36:35 +02:00
parent 5c461d6058
commit 8117f438d4
6 changed files with 0 additions and 2043 deletions

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Copyright (c) 2020-2023, Jeremy Lin
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

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This is taken from https://github.com/jjlin/docker-image-extract, under MIT license.

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#!/bin/sh
#
# This script pulls and extracts all files from an image in Docker Hub.
#
# Copyright (c) 2020-2023, Jeremy Lin
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
PLATFORM_DEFAULT="linux/amd64"
PLATFORM="${PLATFORM_DEFAULT}"
OUT_DIR="./output"
usage() {
echo "This script pulls and extracts all files from an image in Docker Hub."
echo
echo "$0 [OPTIONS...] IMAGE[:REF]"
echo
echo "IMAGE can be a community user image (like 'some-user/some-image') or a"
echo "Docker official image (like 'hello-world', which contains no '/')."
echo
echo "REF is either a tag name or a full SHA-256 image digest (with a 'sha256:' prefix)."
echo "The default ref is the 'latest' tag."
echo
echo "Options:"
echo
echo " -p PLATFORM Pull image for the specified platform (default: ${PLATFORM})"
echo " For a given image on Docker Hub, the 'Tags' tab lists the"
echo " platforms supported for that image."
echo " -o OUT_DIR Extract image to the specified output dir (default: ${OUT_DIR})"
echo " -h Show help with usage examples"
}
usage_detailed() {
usage
echo
echo "Examples:"
echo
echo "# Pull and extract all files in the 'hello-world' image tagged 'latest'."
echo "\$ $0 hello-world:latest"
echo
echo "# Same as above; ref defaults to the 'latest' tag."
echo "\$ $0 hello-world"
echo
echo "# Pull the 'hello-world' image for the 'linux/arm64/v8' platform."
echo "\$ $0 -p linux/arm64/v8 hello-world"
echo
echo "# Pull an image by digest."
echo "\$ $0 hello-world:sha256:90659bf80b44ce6be8234e6ff90a1ac34acbeb826903b02cfa0da11c82cbc042"
}
if [ $# -eq 0 ]; then
usage_detailed
exit 0
fi
while getopts ':ho:p:' opt; do
case $opt in
o)
OUT_DIR="${OPTARG}"
;;
p)
PLATFORM="${OPTARG}"
;;
h)
usage_detailed
exit 0
;;
\?)
echo "ERROR: Invalid option '-$OPTARG'."
echo
usage
exit 1
;;
\:) echo "ERROR: Argument required for option '-$OPTARG'."
echo
usage
exit 1
;;
esac
done
shift $(($OPTIND - 1))
if [ $# -eq 0 ]; then
echo "ERROR: Image to pull must be specified."
echo
usage
exit 1
fi
if [ -e "${OUT_DIR}" ]; then
if [ -d "${OUT_DIR}" ]; then
echo "WARNING: Output dir already exists. If it contains a previous extracted image,"
echo "there may be errors when trying to overwrite files with read-only permissions."
echo
else
echo "ERROR: Output dir already exists, but is not a directory."
exit 1
fi
fi
have_curl() {
command -v curl >/dev/null
}
have_wget() {
command -v wget >/dev/null
}
if ! have_curl && ! have_wget; then
echo "This script requires either curl or wget."
exit 1
fi
image_spec="$1"
image="${image_spec%%:*}"
if [ "${image#*/}" = "${image}" ]; then
# Docker official images are in the 'library' namespace.
image="library/${image}"
fi
ref="${image_spec#*:}"
if [ "${ref}" = "${image_spec}" ]; then
echo "Defaulting ref to tag 'latest'..."
ref=latest
fi
# Split platform (OS/arch/variant) into separate variables.
# A platform specifier doesn't always include the `variant` component.
OLD_IFS="${IFS}"
IFS=/ read -r OS ARCH VARIANT <<EOF
${PLATFORM}
EOF
IFS="${OLD_IFS}"
# Given a JSON input on stdin, extract the string value associated with the
# specified key. This avoids an extra dependency on a tool like `jq`.
extract() {
local key="$1"
# Extract "<key>":"<val>" (assumes key/val won't contain double quotes).
# The colon may have whitespace on either side.
grep -o "\"${key}\"[[:space:]]*:[[:space:]]*\"[^\"]\+\"" |
# Extract just <val> by deleting the last '"', and then greedily deleting
# everything up to '"'.
sed -e 's/"$//' -e 's/.*"//'
}
# Fetch a URL to stdout. Up to two header arguments may be specified:
#
# fetch <url> [name1: value1] [name2: value2]
#
fetch() {
if have_curl; then
if [ $# -eq 2 ]; then
set -- -H "$2" "$1"
elif [ $# -eq 3 ]; then
set -- -H "$2" -H "$3" "$1"
fi
curl -sSL "$@"
else
if [ $# -eq 2 ]; then
set -- --header "$2" "$1"
elif [ $# -eq 3 ]; then
set -- --header "$2" --header "$3" "$1"
fi
wget -qO- "$@"
fi
}
# https://docs.docker.com/docker-hub/api/latest/#tag/repositories
manifest_list_url="https://hub.docker.com/v2/repositories/${image}/tags/${ref}"
# If the ref is already a SHA-256 image digest, then we don't need to look up anything.
if [ -z "${ref##sha256:*}" ]; then
digest="${ref}"
else
echo "Getting multi-arch manifest list..."
NL='
'
digest=$(fetch "${manifest_list_url}" |
# Break up the single-line JSON output into separate lines by adding
# newlines before and after the chars '[', ']', '{', and '}'.
# This uses the \${NL} syntax because some BSD variants of sed don't
# support \n syntax in the replacement string, but instead require
# a literal newline preceded by a backslash.
sed -e 's/\([][{}]\)/\'"${NL}"'\1\'"${NL}"'/g' |
# Extract the "images":[...] list.
sed -n '/"images":/,/]/ p' |
# Each image's details are now on a separate line, e.g.
# "architecture":"arm64","features":"","variant":"v8","digest":"sha256:054c85801c4cb41511b176eb0bf13a2c4bbd41611ddd70594ec3315e88813524","os":"linux","os_features":"","os_version":null,"size":828724,"status":"active","last_pulled":"2022-09-02T22:46:48.240632Z","last_pushed":"2022-09-02T00:42:45.69226Z"
# The image details are interspersed with lines of stray punctuation,
# so grep for an arbitrary string that must be in these lines.
grep architecture |
# Search for an image that matches the platform.
while read -r image; do
# Arch is probably most likely to be unique, so check that first.
arch="$(echo ${image} | extract 'architecture')"
if [ "${arch}" != "${ARCH}" ]; then continue; fi
os="$(echo ${image} | extract 'os')"
if [ "${os}" != "${OS}" ]; then continue; fi
variant="$(echo ${image} | extract 'variant')"
if [ "${variant}" = "${VARIANT}" ]; then
echo ${image} | extract 'digest'
break
fi
done)
if [ -n "${digest}" ]; then
echo "Platform ${PLATFORM} resolved to '${digest}'..."
else
echo "No image digest found. Verify that the image, ref, and platform are valid."
exit 1
fi
fi
# https://docs.docker.com/registry/spec/auth/token/#how-to-authenticate
api_token_url="https://auth.docker.io/token?service=registry.docker.io&scope=repository:$image:pull"
# https://github.com/docker/distribution/blob/master/docs/spec/api.md#pulling-an-image-manifest
manifest_url="https://registry-1.docker.io/v2/${image}/manifests/${digest}"
# https://github.com/docker/distribution/blob/master/docs/spec/api.md#pulling-a-layer
blobs_base_url="https://registry-1.docker.io/v2/${image}/blobs"
echo "Getting API token..."
token=$(fetch "${api_token_url}" | extract 'token')
auth_header="Authorization: Bearer $token"
# https://github.com/distribution/distribution/blob/main/docs/spec/manifest-v2-2.md
docker_manifest_v2="application/vnd.docker.distribution.manifest.v2+json"
# https://github.com/opencontainers/image-spec/blob/main/manifest.md
oci_manifest_v1="application/vnd.oci.image.manifest.v1+json"
# Docker Hub can return either type of manifest format. Most images seem to
# use the Docker format for now, but the OCI format will likely become more
# common as features that require that format become enabled by default
# (e.g., https://github.com/docker/build-push-action/releases/tag/v3.3.0).
accept_header="Accept: ${docker_manifest_v2},${oci_manifest_v1}"
echo "Getting image manifest for $image:$ref..."
layers=$(fetch "${manifest_url}" "${auth_header}" "${accept_header}" |
# Extract `digest` values only after the `layers` section appears.
sed -n '/"layers":/,$ p' |
extract 'digest')
if [ -z "${layers}" ]; then
echo "No layers returned. Verify that the image and ref are valid."
exit 1
fi
mkdir -p "${OUT_DIR}"
for layer in $layers; do
hash="${layer#sha256:}"
echo "Fetching and extracting layer ${hash}..."
fetch "${blobs_base_url}/${layer}" "${auth_header}" | gzip -d | tar -C "${OUT_DIR}" -xf -
# Ref: https://github.com/moby/moby/blob/master/image/spec/v1.2.md#creating-an-image-filesystem-changeset
# https://github.com/moby/moby/blob/master/pkg/archive/whiteouts.go
# Search for "whiteout" files to indicate files deleted in this layer.
OLD_IFS="${IFS}"
find "${OUT_DIR}" -name '.wh.*' | while IFS= read -r f; do
dir="${f%/*}"
wh_file="${f##*/}"
file="${wh_file#.wh.}"
# Delete both the whiteout file and the whited-out file.
rm -rf "${dir}/${wh_file}" "${dir}/${file}"
done
IFS="${OLD_IFS}"
done
echo "Image contents extracted into ${OUT_DIR}."

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MIT License
Copyright (c) 2018 TJ Holowaychuk
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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This is taken from https://github.com/tj/n/

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