From a064f40ffd60a63769cdc9e90305e6f1c35a6905 Mon Sep 17 00:00:00 2001
From: Luca Bruno <luca.bruno@coreos.com>
Date: Tue, 16 Oct 2018 14:18:28 +0000
Subject: [PATCH] scripts: add a contents manifest generator

This adds a minimal script with a reduced set of binary dependencies
(`find` and `sha512sum`) to generate a `torcx-remote-contents-v1`
manifest from a directory of assets.
---
 scripts/torcx-remote-contents.sh | 145 +++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100755 scripts/torcx-remote-contents.sh

diff --git a/scripts/torcx-remote-contents.sh b/scripts/torcx-remote-contents.sh
new file mode 100755
index 0000000..1c6b107
--- /dev/null
+++ b/scripts/torcx-remote-contents.sh
@@ -0,0 +1,145 @@
+#!/usr/bin/env bash
+# Copyright 2018 Red Hat.
+# Licensed under the Apache License, Version 2.0 (the "License").
+
+## Scan a directory of assets and print the corresponding
+## `torcx-remote-contents-v1` manifest:
+## $ torcx-remote-contents.sh -p . > torcx_remote_contents.json
+
+
+set -eo pipefail
+
+ASSETS_PATH=${ASSETS_PATH:-.}
+
+# Index map: "name" -> [ list of hashes ]
+declare -A addons
+# Property maps: "name:hash" -> property"
+declare -A formats
+declare -A locations
+declare -A versions
+
+## Scan for images
+
+scan_assets() {
+  for path in $("${BIN_FIND}" "${ASSETS_PATH}" -type f \( -name '*:*.torcx.tgz' -o -name '*:*.torcx.squashfs' \) -printf '%P\n'); do
+    local img namever name version format shahash namehash seen
+    img="$(echo "${path}" | rev | cut -d'/' -f 1 | rev)"
+    namever="$(echo "${img}" | rev | cut -d'.' -f 3- | rev)"
+
+    # Extract image properties from filepath
+    name="$(echo "${namever}" | cut -d':' -f 1)"
+    version="$(echo "${namever}" | cut -d':' -f 2)"
+    format="$(echo "${img}" | rev | cut -d'.' -f 1 | rev)"
+    shahash="sha512-$("${BIN_SHASUM}" "${ASSETS_PATH}"/"${path}" | cut -d' ' -f 1)"
+
+    # Record properties in keyed maps
+    namehash="${name}:${shahash}"
+    seen="${addons[${name}]}"
+    addons["${name}"]="${shahash} ${seen}"
+    formats["${namehash}"]="${format}"
+    locations["${namehash}"]="${path}"
+    versions["${namehash}"]="${version}"
+  done
+}
+
+## Print manifest to stdout
+
+print_manifest() {
+  local imagecomma=""
+
+  # Print fixed header
+  "${BIN_PRINTF}" "${HEADER}"
+
+  for name in "${!addons[@]}"; do
+    local vercomma=""
+
+    "${BIN_PRINTF}" "${imagecomma}"
+    imagecomma=","
+    # Interpolate and print image header
+    "${BIN_PRINTF}" "${NAME_HEADER}" "${name}"
+
+    for hash in ${addons[$name]}; do
+      "${BIN_PRINTF}" "${vercomma}"
+      vercomma=","
+      local namehash="${name}:${hash}"
+
+      # Interpolate and print image-version template
+      "${BIN_PRINTF}" "${IMAGE_TEMPLATE}" \
+       "${versions[${namehash}]}" \
+       "${formats[${namehash}]}" \
+       "${locations[${namehash}]}" \
+       "${hash}"
+    done
+
+    # Print fixed image footer
+    "${BIN_PRINTF}" "${NAME_FOOTER}"
+
+  done
+
+  # Print fixed manifest footer
+  "${BIN_PRINTF}" "${FOOTER}"
+}
+
+
+## Templates
+
+HEADER='{
+  "kind": "torcx-remote-contents-v1",
+  "value": {
+    "images": ['
+
+NAME_HEADER='
+      {
+        "name": "%s",
+        "versions": ['
+
+IMAGE_TEMPLATE='
+          {
+            "version": "%s",
+            "format": "%s",
+            "location": "%s",
+            "hash": "%s"
+          }'
+
+NAME_FOOTER='
+        ]
+      }
+'
+
+FOOTER="    ]
+  }
+}
+"
+
+## Script body
+
+while getopts ":p:" OPTION
+do
+    case $OPTION in
+        p) ASSETS_PATH="${OPTARG}" ;;
+        *) echo "usage: $0 [-p ASSETS_PATH]" >&2
+           exit 1 ;;
+    esac
+done
+
+if ! BIN_FIND=$(which find 2> /dev/null); then
+  echo "no find binary found" >&2
+  exit 1
+fi
+if ! BIN_PRINTF=$(which printf 2> /dev/null); then
+  echo "no printf binary found" >&2
+  exit 1
+fi
+if ! BIN_SHASUM=$(which sha512sum 2> /dev/null); then
+  echo "no sha512sum binary found" >&2
+  exit 1
+fi
+
+if [[ ! -d "${ASSETS_PATH}" ]]; then
+  echo "assets directory not found" >&2
+  exit 1
+fi
+
+scan_assets
+
+print_manifest