Gets latest tag, increment build number, set a commit with this tag and push

updateBuildNumberAndPushTag.sh

#!/bin/bash

echo "Please set an input your tag description, ticket number etc."
read TAG_DESCRIPTION

# get latest tag number
VERSION=`git describe --abbrev=0 --tags`
echo "CURRENT VERSION => $VERSION"

#replace . with space so can split into an array
VERSION_BITS=(${VERSION//./ })

#get tag number parts for version and build numbers
VNUM1=${VERSION_BITS[0]}
VNUM2=${VERSION_BITS[1]}
VNUM3=${VERSION_BITS[2]}

# Get Tags Latest number, increment and set build number
# bump build number 
VNUM3=$((VNUM3+1))

# set new build number
# use AGVTool for set new build number
agvtool new-version -all $VNUM3
echo "Updated new-version VNUM3 => $VNUM3"

# add and push that commit
git add .
git commit -m "Bump build number to $VNUM1.$VNUM2.$VNUM3" 
git push

#create new tag
NEW_TAG="v$VNUM1.$VNUM2($VNUM3)"

echo "Updating $VERSION to $NEW_TAG"

#get current hash and see if it already has a tag
GIT_COMMIT=`git rev-parse HEAD`
NEEDS_TAG=`git describe --contains $GIT_COMMIT 2>/dev/null`

# only tag if no tag already
if [ -z "$NEEDS_TAG" ]; then
    git tag -a $NEW_TAG -m "$TAG_DESCRIPTION"
    echo "Tagged with $NEW_TAG"
    git push --tags
else
    echo "Already a tag on this commit"
fi