Generates a diff between two commit hashes after a build process (ie grunt, npm install, etc)

Git-repo-diff-generator.sh

#!/bin/bash

# Static config
CMD_GIT="/usr/bin/git";
CMD_NPMPRUNE="/usr/bin/npm prune";
CMD_NPMCACHECLEAN="/usr/bin/npm cache clean";
CMD_NPMINSTALL="/usr/bin/npm install";
CMD_GRUNT="/usr/bin/grunt";
DIR_A="a";
DIR_B="b";
DIR_DIFF="diff";

# User input config
printf "Path to build everything in: "; read -r PROJECT_DIRECTORY;
printf "Remote repo URL: ";             read -r REMOTE_REPO;
printf "First (older) commit hash: ";   read -r REMOTE_HASH_A;
printf "Second (newer) commit hash: ";  read -r REMOTE_HASH_B;

# Create project directory
mkdir -p $PROJECT_DIRECTORY; cd $PROJECT_DIRECTORY;

# Pull remote repos, checkout respective commits
$CMD_GIT clone --recursive $REMOTE_REPO $DIR_A; cp -r $DIR_A $DIR_B;
cd $DIR_A; git checkout $REMOTE_HASH_A; cd ..;
cd $DIR_B; git checkout $REMOTE_HASH_B; cd ..;

# Build both projects
cd $DIR_A; $CMD_NPMPRUNE; $CMD_NPMCACHECLEAN; $CMD_NPMINSTALL; $CMD_GRUNT; cd ..;
cd $DIR_B; $CMD_NPMPRUNE; $CMD_NPMCACHECLEAN; $CMD_NPMINSTALL; $CMD_GRUNT; cd ..;

# Create new diff repo, move deploy folders into their own branches 
mkdir -p $DIR_DIFF; cd $DIR_DIFF;
$CMD_GIT init;
mv ../$DIR_A/deploy/* .;
$CMD_GIT add -A && $CMD_GIT commit -m "A";
$CMD_GIT branch b && $CMD_GIT checkout b; rm -rf *;
mv ../$DIR_B/deploy/* .;
$CMD_GIT add -A && $CMD_GIT commit -m "B";

# Generate diff file and perform clean up
$CMD_GIT diff master...b > ../diff.txt;
echo "\n\nDIFF SUCCESSFULLY GENERATED... beginning cleanup\n\n";
cd ..; rm -rf $DIR_A $DIR_B $DIR_DIFF;
echo "\n\nCLEANUP SUCCESSFUL... diff available in $PROJECT_DIRECTORY/diff.txt\n\n";