From c3fca84f25d6f33505ee6a9111d4674247ee5ebb Mon Sep 17 00:00:00 2001
From: Harshavardhana <harsha@harshavardhana.net>
Date: Thu, 4 Dec 2014 01:56:01 -0800
Subject: [PATCH] Add git and mercurial as dependencies

---
 DEVELOPERS.md | 12 +++++++++++-
 Makefile      |  5 ++++-
 checkdeps.sh  | 36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 51 insertions(+), 2 deletions(-)
 create mode 100755 checkdeps.sh

diff --git a/DEVELOPERS.md b/DEVELOPERS.md
index fde00da2d..46e789b4a 100644
--- a/DEVELOPERS.md
+++ b/DEVELOPERS.md
@@ -1,6 +1,16 @@
 ### Build Dependencies
 This installation document assumes Ubuntu 12.04 or later on x86-64.
 
+##### Install Git and GCC
+```sh
+$ sudo apt-get install git build-essential
+```
+
+##### Install Mercurial
+```sh
+$ sudo apt-get install mercurial
+```
+
 ##### Install YASM
 ```sh
 $ sudo apt-get install yasm
@@ -20,7 +30,7 @@ $ export PATH=$PATH:$GOPATH/bin
 ```
 
 ### Setup your Minio Github Repository &nbsp; &nbsp; <iframe src="http://ghbtns.com/github-btn.html?user=Minio-io&repo=minio&type=fork&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe>
-Fork [Minio upstream](https://github.com/Minio-io/minio) source repository to your own personal repository. Copy the URL and pass it to ``go get`` command. Go uses git to clone a copy into your project workspace folder. 
+Fork [Minio upstream](https://github.com/Minio-io/minio) source repository to your own personal repository. Copy the URL and pass it to ``go get`` command. Go uses git to clone a copy into your project workspace folder.
 ```sh
 $ go get -u github.com/$USER_ID/minio
 $ cd $GOPATH/src/github.com/$USER_ID/minio/
diff --git a/Makefile b/Makefile
index b3ca9139e..92b1a6e09 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,10 @@ MAKE_OPTIONS := -s
 
 all: getdeps cover install
 
-getdeps:
+checkdeps:
+	@./checkdeps.sh
+
+getdeps: checkdeps
 	@go get github.com/tools/godep && echo "Installing godep"
 	@go get code.google.com/p/go.tools/cmd/cover && echo "Installing cover"
 
diff --git a/checkdeps.sh b/checkdeps.sh
new file mode 100755
index 000000000..ddb2df578
--- /dev/null
+++ b/checkdeps.sh
@@ -0,0 +1,36 @@
+#!/bin/sh
+
+echo -n "Checking dependencies for Minio.. "
+
+## Check all dependencies are present
+MISSING=""
+
+env git --version > /dev/null 2>&1
+if [ $? -ne 0 ]; then
+  MISSING="${MISSING} git"
+fi
+
+env hg --version > /dev/null 2>&1
+if [ $? -ne 0 ]; then
+    MISSING="${MISSING} mercurial"
+fi
+
+env gcc --version > /dev/null 2>&1
+if [ $? -ne 0 ]; then
+    MISSING="${MISSING} build-essential"
+fi
+
+## If dependencies are missing, warn the user and abort
+if [ "x${MISSING}" != "x" ]; then
+  echo "ERROR"
+  echo
+  echo "The following build tools are missing:"
+  echo
+  echo "** ${MISSING} **"
+  echo
+  echo "Please install them "
+  echo "$ sudo apt-get install ${MISSING}"
+  echo
+  exit 1
+fi
+echo "SUCCESS"