From d7f96ed8cfa3a1a051207e247afa24051fed415b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maciej=20Kr=C3=BCger?= <mkg20001@gmail.com>
Date: Sun, 21 Oct 2018 15:38:41 +0200
Subject: [PATCH] fix: Mention node on readme, drop python requirement

---
 Makefile     | 2 +-
 README.md    | 4 +++-
 json2yaml.js | 9 +++++++++
 3 files changed, 13 insertions(+), 2 deletions(-)
 create mode 100644 json2yaml.js

diff --git a/Makefile b/Makefile
index 0c593f2..9e53a6d 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,7 @@ clean:
 	rm -rf *.img *.model *.manifest snaps
 
 %.model: boards/%.yaml # sign a model file
-	cat definition.yaml $< | python -c "import sys, yaml, json; json.dump(yaml.load(sys.stdin), sys.stdout, indent=2)" | sed "s|TIMESTAMP|$(shell date -Iseconds --utc)|g" | snap sign -k "$(USER_KEY)" > $@
+	cat definition.yaml $< | node json2yaml.js | sed "s|TIMESTAMP|$(shell date -Iseconds --utc)|g" | snap sign -k "$(USER_KEY)" > $@
 snaps/%: deps/%.yaml
 	node build-tool.js --env $(ENV) --channel $(CHANNEL) --board $*
 .cloud-init.yaml: $(ENV).cloud-init.yaml
diff --git a/README.md b/README.md
index d676dcf..5dcaf8c 100644
--- a/README.md
+++ b/README.md
@@ -10,12 +10,14 @@ Everything subject to change, including number of bugs (hopefully to zero ;)
 
 ## System Requirements
 
-To build an image you need to have at least Ubuntu 16.04 on your machine and the following packages installed: `ubuntu-image snapd`
+To build an image you need to have at least Ubuntu 16.04 on your machine and the following packages installed: `ubuntu-image snapd nodejs`
 
 Additionally at least 1 GB of free disk space is required
 
 For virtual device testing you also need `qemu-kvm`
 
+Additionally some npm packages are required, run `npm i` to install them
+
 ## Other Requirements
 
  - Ubuntu One account
diff --git a/json2yaml.js b/json2yaml.js
new file mode 100644
index 0000000..d4339bb
--- /dev/null
+++ b/json2yaml.js
@@ -0,0 +1,9 @@
+'use strict'
+
+const yaml = require('js-yaml')
+let d = []
+
+process.stdin.on('data', data => d.push(data))
+process.stdin.on('end', () => {
+  console.log(JSON.stringify(yaml.safeLoad(Buffer.concat(d)), null, 2))
+})