mirror of
https://github.com/genuinetools/reg.git
synced 2024-09-12 06:11:03 -04:00
307 lines
10 KiB
Bash
Executable file
307 lines
10 KiB
Bash
Executable file
#!/usr/bin/env bash
|
|
set -eo pipefail
|
|
|
|
# hello-world latest ef872312fe1b 3 months ago 910 B
|
|
# hello-world latest ef872312fe1bbc5e05aae626791a47ee9b032efa8f3bda39cc0be7b56bfe59b9 3 months ago 910 B
|
|
|
|
# debian latest f6fab3b798be 10 weeks ago 85.1 MB
|
|
# debian latest f6fab3b798be3174f45aa1eb731f8182705555f89c9026d8c1ef230cbf8301dd 10 weeks ago 85.1 MB
|
|
|
|
if ! command -v curl &> /dev/null; then
|
|
echo >&2 'error: "curl" not found!'
|
|
exit 1
|
|
fi
|
|
if ! command -v jq &> /dev/null; then
|
|
echo >&2 'error: "jq" not found!'
|
|
exit 1
|
|
fi
|
|
|
|
usage() {
|
|
echo "usage: $0 dir image[:tag][@digest] ..."
|
|
echo " $0 /tmp/old-hello-world hello-world:latest@sha256:8be990ef2aeb16dbcb9271ddfe2610fa6658d13f6dfb8bc72074cc1ca36966a7"
|
|
[ -z "$1" ] || exit "$1"
|
|
}
|
|
|
|
dir="$1" # dir for building tar in
|
|
shift || usage 1 >&2
|
|
|
|
[ $# -gt 0 -a "$dir" ] || usage 2 >&2
|
|
mkdir -p "$dir"
|
|
|
|
# hacky workarounds for Bash 3 support (no associative arrays)
|
|
images=()
|
|
rm -f "$dir"/tags-*.tmp
|
|
manifestJsonEntries=()
|
|
doNotGenerateManifestJson=
|
|
# repositories[busybox]='"latest": "...", "ubuntu-14.04": "..."'
|
|
|
|
# bash v4 on Windows CI requires CRLF separator
|
|
newlineIFS=$'\n'
|
|
if [ "$(go env GOHOSTOS)" = 'windows' ]; then
|
|
major=$(echo ${BASH_VERSION%%[^0.9]} | cut -d. -f1)
|
|
if [ "$major" -ge 4 ]; then
|
|
newlineIFS=$'\r\n'
|
|
fi
|
|
fi
|
|
|
|
registryBase='https://registry-1.docker.io'
|
|
authBase='https://auth.docker.io'
|
|
authService='registry.docker.io'
|
|
|
|
# https://github.com/moby/moby/issues/33700
|
|
fetch_blob() {
|
|
local token="$1"; shift
|
|
local image="$1"; shift
|
|
local digest="$1"; shift
|
|
local targetFile="$1"; shift
|
|
local curlArgs=( "$@" )
|
|
|
|
local curlHeaders="$(
|
|
curl -S "${curlArgs[@]}" \
|
|
-H "Authorization: Bearer $token" \
|
|
"$registryBase/v2/$image/blobs/$digest" \
|
|
-o "$targetFile" \
|
|
-D-
|
|
)"
|
|
curlHeaders="$(echo "$curlHeaders" | tr -d '\r')"
|
|
if echo "$curlHeaders" | grep -qE "^HTTP/[0-9].[0-9] 3"; then
|
|
rm -f "$targetFile"
|
|
|
|
local blobRedirect="$(echo "$curlHeaders" | awk -F ': ' 'tolower($1) == "location" { print $2; exit }')"
|
|
if [ -z "$blobRedirect" ]; then
|
|
echo >&2 "error: failed fetching '$image' blob '$digest'"
|
|
echo "$curlHeaders" | head -1 >&2
|
|
return 1
|
|
fi
|
|
|
|
curl -fSL "${curlArgs[@]}" \
|
|
"$blobRedirect" \
|
|
-o "$targetFile"
|
|
fi
|
|
}
|
|
|
|
while [ $# -gt 0 ]; do
|
|
imageTag="$1"
|
|
shift
|
|
image="${imageTag%%[:@]*}"
|
|
imageTag="${imageTag#*:}"
|
|
digest="${imageTag##*@}"
|
|
tag="${imageTag%%@*}"
|
|
|
|
# add prefix library if passed official image
|
|
if [[ "$image" != *"/"* ]]; then
|
|
image="library/$image"
|
|
fi
|
|
|
|
imageFile="${image//\//_}" # "/" can't be in filenames :)
|
|
|
|
token="$(curl -fsSL "$authBase/token?service=$authService&scope=repository:$image:pull" | jq --raw-output '.token')"
|
|
|
|
manifestJson="$(
|
|
curl -fsSL \
|
|
-H "Authorization: Bearer $token" \
|
|
-H 'Accept: application/vnd.docker.distribution.manifest.v2+json' \
|
|
-H 'Accept: application/vnd.docker.distribution.manifest.v1+json' \
|
|
"$registryBase/v2/$image/manifests/$digest"
|
|
)"
|
|
if [ "${manifestJson:0:1}" != '{' ]; then
|
|
echo >&2 "error: /v2/$image/manifests/$digest returned something unexpected:"
|
|
echo >&2 " $manifestJson"
|
|
exit 1
|
|
fi
|
|
|
|
imageIdentifier="$image:$tag@$digest"
|
|
|
|
schemaVersion="$(echo "$manifestJson" | jq --raw-output '.schemaVersion')"
|
|
case "$schemaVersion" in
|
|
2)
|
|
mediaType="$(echo "$manifestJson" | jq --raw-output '.mediaType')"
|
|
|
|
case "$mediaType" in
|
|
application/vnd.docker.distribution.manifest.v2+json)
|
|
configDigest="$(echo "$manifestJson" | jq --raw-output '.config.digest')"
|
|
imageId="${configDigest#*:}" # strip off "sha256:"
|
|
|
|
configFile="$imageId.json"
|
|
fetch_blob "$token" "$image" "$configDigest" "$dir/$configFile" -s
|
|
|
|
layersFs="$(echo "$manifestJson" | jq --raw-output --compact-output '.layers[]')"
|
|
IFS="$newlineIFS"
|
|
layers=( $layersFs )
|
|
unset IFS
|
|
|
|
echo "Downloading '$imageIdentifier' (${#layers[@]} layers)..."
|
|
layerId=
|
|
layerFiles=()
|
|
for i in "${!layers[@]}"; do
|
|
layerMeta="${layers[$i]}"
|
|
|
|
layerMediaType="$(echo "$layerMeta" | jq --raw-output '.mediaType')"
|
|
layerDigest="$(echo "$layerMeta" | jq --raw-output '.digest')"
|
|
|
|
# save the previous layer's ID
|
|
parentId="$layerId"
|
|
# create a new fake layer ID based on this layer's digest and the previous layer's fake ID
|
|
layerId="$(echo "$parentId"$'\n'"$layerDigest" | sha256sum | cut -d' ' -f1)"
|
|
# this accounts for the possibility that an image contains the same layer twice (and thus has a duplicate digest value)
|
|
|
|
mkdir -p "$dir/$layerId"
|
|
echo '1.0' > "$dir/$layerId/VERSION"
|
|
|
|
if [ ! -s "$dir/$layerId/json" ]; then
|
|
parentJson="$(printf ', parent: "%s"' "$parentId")"
|
|
addJson="$(printf '{ id: "%s"%s }' "$layerId" "${parentId:+$parentJson}")"
|
|
# this starter JSON is taken directly from Docker's own "docker save" output for unimportant layers
|
|
jq "$addJson + ." > "$dir/$layerId/json" <<-'EOJSON'
|
|
{
|
|
"created": "0001-01-01T00:00:00Z",
|
|
"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
|
|
}
|
|
}
|
|
EOJSON
|
|
fi
|
|
|
|
case "$layerMediaType" in
|
|
application/vnd.docker.image.rootfs.diff.tar.gzip)
|
|
layerTar="$layerId/layer.tar"
|
|
layerFiles=( "${layerFiles[@]}" "$layerTar" )
|
|
# TODO figure out why "-C -" doesn't work here
|
|
# "curl: (33) HTTP server doesn't seem to support byte ranges. Cannot resume."
|
|
# "HTTP/1.1 416 Requested Range Not Satisfiable"
|
|
if [ -f "$dir/$layerTar" ]; then
|
|
# TODO hackpatch for no -C support :'(
|
|
echo "skipping existing ${layerId:0:12}"
|
|
continue
|
|
fi
|
|
token="$(curl -fsSL "$authBase/token?service=$authService&scope=repository:$image:pull" | jq --raw-output '.token')"
|
|
fetch_blob "$token" "$image" "$layerDigest" "$dir/$layerTar" --progress
|
|
;;
|
|
|
|
*)
|
|
echo >&2 "error: unknown layer mediaType ($imageIdentifier, $layerDigest): '$layerMediaType'"
|
|
exit 1
|
|
;;
|
|
esac
|
|
done
|
|
|
|
# change "$imageId" to be the ID of the last layer we added (needed for old-style "repositories" file which is created later -- specifically for older Docker daemons)
|
|
imageId="$layerId"
|
|
|
|
# munge the top layer image manifest to have the appropriate image configuration for older daemons
|
|
imageOldConfig="$(jq --raw-output --compact-output '{ id: .id } + if .parent then { parent: .parent } else {} end' "$dir/$imageId/json")"
|
|
jq --raw-output "$imageOldConfig + del(.history, .rootfs)" "$dir/$configFile" > "$dir/$imageId/json"
|
|
|
|
manifestJsonEntry="$(
|
|
echo '{}' | jq --raw-output '. + {
|
|
Config: "'"$configFile"'",
|
|
RepoTags: ["'"${image#library\/}:$tag"'"],
|
|
Layers: '"$(echo '[]' | jq --raw-output ".$(for layerFile in "${layerFiles[@]}"; do echo " + [ \"$layerFile\" ]"; done)")"'
|
|
}'
|
|
)"
|
|
manifestJsonEntries=( "${manifestJsonEntries[@]}" "$manifestJsonEntry" )
|
|
;;
|
|
|
|
*)
|
|
echo >&2 "error: unknown manifest mediaType ($imageIdentifier): '$mediaType'"
|
|
exit 1
|
|
;;
|
|
esac
|
|
;;
|
|
|
|
1)
|
|
if [ -z "$doNotGenerateManifestJson" ]; then
|
|
echo >&2 "warning: '$imageIdentifier' uses schemaVersion '$schemaVersion'"
|
|
echo >&2 " this script cannot (currently) recreate the 'image config' to put in a 'manifest.json' (thus any schemaVersion 2+ images will be imported in the old way, and their 'docker history' will suffer)"
|
|
echo >&2
|
|
doNotGenerateManifestJson=1
|
|
fi
|
|
|
|
layersFs="$(echo "$manifestJson" | jq --raw-output '.fsLayers | .[] | .blobSum')"
|
|
IFS="$newlineIFS"
|
|
layers=( $layersFs )
|
|
unset IFS
|
|
|
|
history="$(echo "$manifestJson" | jq '.history | [.[] | .v1Compatibility]')"
|
|
imageId="$(echo "$history" | jq --raw-output '.[0]' | jq --raw-output '.id')"
|
|
|
|
echo "Downloading '$imageIdentifier' (${#layers[@]} layers)..."
|
|
for i in "${!layers[@]}"; do
|
|
imageJson="$(echo "$history" | jq --raw-output ".[${i}]")"
|
|
layerId="$(echo "$imageJson" | jq --raw-output '.id')"
|
|
imageLayer="${layers[$i]}"
|
|
|
|
mkdir -p "$dir/$layerId"
|
|
echo '1.0' > "$dir/$layerId/VERSION"
|
|
|
|
echo "$imageJson" > "$dir/$layerId/json"
|
|
|
|
# TODO figure out why "-C -" doesn't work here
|
|
# "curl: (33) HTTP server doesn't seem to support byte ranges. Cannot resume."
|
|
# "HTTP/1.1 416 Requested Range Not Satisfiable"
|
|
if [ -f "$dir/$layerId/layer.tar" ]; then
|
|
# TODO hackpatch for no -C support :'(
|
|
echo "skipping existing ${layerId:0:12}"
|
|
continue
|
|
fi
|
|
token="$(curl -fsSL "$authBase/token?service=$authService&scope=repository:$image:pull" | jq --raw-output '.token')"
|
|
fetch_blob "$token" "$image" "$imageLayer" "$dir/$layerId/layer.tar" --progress
|
|
done
|
|
;;
|
|
|
|
*)
|
|
echo >&2 "error: unknown manifest schemaVersion ($imageIdentifier): '$schemaVersion'"
|
|
exit 1
|
|
;;
|
|
esac
|
|
|
|
echo
|
|
|
|
if [ -s "$dir/tags-$imageFile.tmp" ]; then
|
|
echo -n ', ' >> "$dir/tags-$imageFile.tmp"
|
|
else
|
|
images=( "${images[@]}" "$image" )
|
|
fi
|
|
echo -n '"'"$tag"'": "'"$imageId"'"' >> "$dir/tags-$imageFile.tmp"
|
|
done
|
|
|
|
echo -n '{' > "$dir/repositories"
|
|
firstImage=1
|
|
for image in "${images[@]}"; do
|
|
imageFile="${image//\//_}" # "/" can't be in filenames :)
|
|
image="${image#library\/}"
|
|
|
|
[ "$firstImage" ] || echo -n ',' >> "$dir/repositories"
|
|
firstImage=
|
|
echo -n $'\n\t' >> "$dir/repositories"
|
|
echo -n '"'"$image"'": { '"$(cat "$dir/tags-$imageFile.tmp")"' }' >> "$dir/repositories"
|
|
done
|
|
echo -n $'\n}\n' >> "$dir/repositories"
|
|
|
|
rm -f "$dir"/tags-*.tmp
|
|
|
|
if [ -z "$doNotGenerateManifestJson" ] && [ "${#manifestJsonEntries[@]}" -gt 0 ]; then
|
|
echo '[]' | jq --raw-output ".$(for entry in "${manifestJsonEntries[@]}"; do echo " + [ $entry ]"; done)" > "$dir/manifest.json"
|
|
else
|
|
rm -f "$dir/manifest.json"
|
|
fi
|
|
|
|
echo "Download of images into '$dir' complete."
|
|
echo "Use something like the following to load the result into a Docker daemon:"
|
|
echo " tar -cC '$dir' . | docker load"
|