diff2ref.sh

# COMPARE TWO REFERENCES (Branch, Tag, Commit), both in Read-Only Mode
#   Use (from the git repo root):
#     <path to script>/diffref.sh master 123abcd

# Build destination folder
DATEHASH=`echo "obase=16; $(date +%s)" | bc`
DESTFOLDER1=/tmp/diffref-$DATEHASH-$1
DESTFOLDER2=/tmp/diffref-$DATEHASH-$2
mkdir $DESTFOLDER1
mkdir $DESTFOLDER2

# Export Reference
git archive $1 | tar -xC $DESTFOLDER1
git archive $2 | tar -xC $DESTFOLDER2

# Fire Diff
bcomp -ro1 -ro2 $DESTFOLDER1 $DESTFOLDER2 -title1=$1 -title2=$2

# Clean Up
rm -rf $DESTFOLDER1
rm -rf $DESTFOLDER2