Auto-update & build process with NSIS for windows

Amalgamate the electron build packaging into one script.
Use update_base_url so we can compute the actual URL in the
script for windows (because we need to put it in the build) and
at runtime for mac os.

scripts/electron-package.sh

@@ -0,0 +1,133 @@
+#!/bin/bash
+
+set -e
+
+usage() {
+    echo "Usage: $0 -v <version> -c <config file> [-n]"
+    echo
+    echo "version: commit-ish to check out and build"
+    echo "config file: a path to a json config file to"
+    echo "ship with the build. In addition, update_base_url:"
+    echo "from this file is used to set up auto-update."
+    echo "-n: build with no config file."
+    echo
+    echo "Values may also be passed as environment variables"
+}
+
+conffile=
+version=
+skipcfg=0
+while getopts "c:v:n" opt; do
+    case $opt in
+        c)
+            conffile=$OPTARG
+            ;;
+        v)
+            version=$OPTARG
+            ;;
+        n)
+            skipcfg=1
+            ;;
+        \?)
+            echo "Invalid option: -$OPTARG" >&2
+            usage
+            exit
+            ;;
+    esac
+done
+
+if [ -z "$version" ]; then
+    echo "No version supplied"
+    usage
+    exit
+fi
+
+if [ -z "$conffile" ] && [ "$skipcfg" = 0 ]; then
+    echo "No config file given. Use -c to supply a config file or"
+    echo "-n to build with no config file (and no auto update)."
+    exit
+fi
+
+if [ -n "$conffile" ]; then
+    update_base_url=`jq -r .update_base_url $conffile`
+
+    if [ -z "$update_base_url" ]; then
+        echo "No update URL supplied. Use update_base_url: null if you really"
+        echo "want a build with no auto-update."
+        usage
+        exit
+    fi
+    # Make sure the base URL ends in a slash if it doesn't already
+    update_base_url=`echo $update_base_url | sed -e 's#\([^\/]\)$#\1\/#'`
+fi
+
+if [ ! -f package.json ]; then
+    echo "No package.json found. This script must be run from"
+    echo "the vector-web directory."
+    exit
+fi
+
+echo "Building $version using Update base URL $update_base_url"
+
+projdir=`pwd`
+builddir=`mktemp -d 2>/dev/null || mktemp -d -t 'buildtmp'`
+pushd "$builddir"
+git clone "$projdir" .
+git checkout "$version"
+
+if [ -n "$conffile" ]; then
+    popd
+    cp "$conffile" "$builddir/"
+    pushd "$builddir"
+fi
+
+if [ "$update_base_url" != "null" ]; then
+    # Inject a 'publish' configuration into the package.json.  This is what
+    # electron-builder needs for auto-update on windows but we don't want to
+    # keep it in the package.json as we don't want everyone cloning the source
+    # and building it for themselves to get our auto-update URL.
+    update_url=$update_base_url/install/win32/
+    jq '.build.publish.provider="generic"' package.json \
+        | jq '.build.publish.url="$update_url"' \
+        > package.json.tmp
+    mv package.json.tmp package.json
+fi
+
+npm install
+npm run build:electron
+
+popd
+
+distdir="$builddir/electron/dist"
+pubdir="$projdir/electron/pub"
+rm -r "$pubdir" || true
+mkdir -p "$pubdir"
+
+# figure out what version this build is known as
+# (since we could be building from a branch or indeed
+# any commit-ish, not just a version tag)
+vername=`python -c 'import yaml; import sys; print yaml.load(sys.stdin)["version"]' < $builddir/electron/dist/latest.yml`
+
+# Install packages: what the user downloads the first time,
+# (DMGs for mac, exe installer for windows)
+mkdir -p "$pubdir/install/macos"
+cp $distdir/mac/*.dmg "$pubdir/install/macos/"
+
+mkdir -p "$pubdir/install/win32/"
+cp $distdir/*.exe "$pubdir/install/win32/"
+cp $distdir/latest.yml "$pubdir/install/win32/"
+
+# Packages for auto-update on mac (Windows (NSIS) uses the installer exe)
+mkdir -p "$pubdir/update/macos"
+cp $distdir/mac/*.zip "$pubdir/update/macos/"
+echo "$ver" > "$pubdir/update/macos/latest"
+
+# Move the debs to the main project dir's dist folder
+rm -r "$projdir/electron/dist" || true
+mkdir -p "$projdir/electron/dist"
+cp $distdir/*.deb "$projdir/electron/dist/"
+
+rm -rf "$builddir"
+
+echo "Riot Desktop $vername is ready to go in $pubdir: this directory can be hosted on your web server."
+echo "deb archives are in electron/dist/ - these should be added into your debian repository"