Merge pull request #7 from edx/jrbl/feature/json_lint_hooks

Adding pre-commit and post-checkout hooks

README.md

@@ -114,6 +114,7 @@ cloudformation_templates  <-- official edX cloudformation templates
 ```
   mkvirtualenv ansible
   pip install -r ansible-requirements.txt
+  util/sync_hooks.sh
 ```
 
 ### Launching example cloudformation stack - Working example

git-hooks/post-checkout.in

+#!/bin/sh
+
+dir=`git rev-parse --show-toplevel`
+if [ -z $dir ]; then
+    exit 1
+fi
+
+echo -n Setting up hooks from git-hooks..
+$dir/util/sync_hooks.sh >/dev/null
+if [ $? -eq 0 ]; then
+    echo . done.
+else
+    exit 1
+fi

git-hooks/pre-commit.in

+#!/bin/sh
+
+dir=`git rev-parse --show-toplevel`
+if [ -z $dir ]; then
+    exit 1
+fi
+
+echo -n Checking JSON parses..
+$dir/util/json_lint.sh
+if [ $? -eq 0 ]; then
+    echo . it does!
+else
+    exit 1
+fi

util/json_lint.sh

+#!/bin/bash
+# A very simple check to see if the json files in the project at least compile.
+# If they do not, a cryptic message that might be helpful is produced.
+
+
+# Save current directory so we can come back; change to repo root
+STARTED_FROM=`pwd`
+cd $(git rev-parse --show-toplevel)
+
+# Do very basic syntax check of every json file to make sure it's valid format
+for file in `find . -iname '*.json'`; do 
+    cat $file | python -m json.tool 1>/dev/null 2>json_complaint.err; 
+    retval=$?
+    if [ $retval != 0 ]; then
+        echo "JSON errors in $file"
+        cat json_complaint.err
+        rm -f json_complaint.err
+        cd $STARTED_FROM
+        exit $retval;
+    fi
+done
+
+# Everything went ok!
+rm -f json_complaint.err
+cd $STARTED_FROM
+exit 0

util/sync_hooks.sh

+#!/bin/bash
+# A small utility to symlink the files from git-hooks/ with filenames ending
+# like .in into the directory .git/hooks/
+#
+# It's intended this be run once near the start of a project by hand, and then
+# subsequently a hook that it installs keeps it running at project checkouts.
+
+
+# Save current directory so we can come back; change to repo root
+STARTED_FROM=`pwd`
+cd $(git rev-parse --show-toplevel)
+
+# Sync git-hooks directory entries into .git/hooks/
+for file in git-hooks/*.in; do
+    filepart=`basename $file .in`
+    if [ -e .git/hooks/$filepart -a ! -L .git/hooks/$filepart ]; then
+        echo ".git/hooks/$filepart not link-managed; bailing..."
+        echo "please examine your .git/hooks/ directory and repair inconsistencies manually"
+        cd $STARTED_FROM
+        exit 1
+    else
+        ln -v -s -b -f `pwd`/$file .git/hooks/$filepart
+    fi
+done
+
+# Ok, everything went well; restore previous context
+cd $STARTED_FROM
+exit 0