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Using the terminal, is it possible to clean and install the projects within a POM Project that have changes after a git merge/pull, in other words, changes since the last clean install?

EDIT

Thanks to VonC's answer, I have completed a script that does what I desired. See my answer bellow for details.

Since you can detect the list of pom.xml changes between two commits:

git diff --name-status <commit1> <commit2>

(see also "Detail change after Git pull")

, you can make a script which would, for each module, do a mvn clean install.

Thanks to VonC's answer, I have completed a script that does what I desired.

The project is a POM Project that contains sub-POM Projects that house the main projects for the application. I achieved the desired result by getting the current working branch to call git diff --name-status HEAD@1 <current_branch>.

This got the list of the changed files within the project, which I then split into an array. Unfortunately I could not get the split to work well, so the array is organized as change type followed by file path.

Then I checked string size, skipping single character strings. The next step was to split the string into an array, delimited by /. Checked if it exists in an array if root paths, adding if it does not.

Lastly, loop over the root path array and do the maven calls.

################################################################################
#
# License:.....GNU General Public License v3.0
# Author:......CodeMonkey
# Date:........14 November 2018
# Title:.......GitMavenCleanInstall.sh
# Description: This script is designed to cd to a set Maven POM Project,
# perform a git remote update and pull, and clean install the changed
# files projects.
# Notice:......The project structure this script was originally set to target
# is structured as a Maven POM Project that contains several sub-POM Projects.
# The sub-POM Projects contain Maven Java Application projects. The targets
# should be easy to change, and allow for others to target other structures.
#
################################################################################
#
# Change History: N/A
#
################################################################################

#!/bin/bash
#Function to check if array has element
containsElement () 
 local e match="$1"
 shift
 for e; do [[ "$e" == "$match" ]] && return 0; done
 return 1


#Navigate to the POM Project
cd PATH/TO/POM/PROJECT
#Remote update
git remote update -p
#Pull
git pull

#Get the current working branch
CURRENT_BRANCH="$(git branch | sed -n -e 's/^* (.*)/1/p')"
#Get the output of the command git diff
GIT_DIFF_OUTPUT="$(git diff --name-status HEAD@1 $CURRENT_BRANCH)"

#Split the diff output into an array
read =a GIT_DIFF_OUTPUT_ARY <<< $GIT_DIF_OUTPUT
#Declare empty array for root path
declare -a GIT_DIFF_OUTPUT_ARY_ROOT_PATH=()
FORWARD='/'
#Loop diff output array
for i in "$GIT_DIFF_OUTPUT_ARY[@]}"
do
 #Check that the string is not 1 Character
 if [[ "$(echo -n $1 | wc -m)" != 1 ]]
 then
 #Split the file path by /
 IFS='/' read -ra SPLIT <<< $i
 #Concatenate first path + / + second path
 path=$SPLIT[0]$FORWARD$SPLIT[1]
 #Call function to see if it already exists in the root path array
 containsElement "$path" "$GIT_DIFF_OUTPUT_ARY_ROOT_PATH[@]"
 if [[ $? != 0 ]]
 then
 #Add the path since it was not found
 GIT_DIFF_OUTPUT_ARY_ROOT_PATH+=($path)
 fi
 fi
done

#Loop root path array
for val in $GIT_DIFF_OUTPUT_ARY_ROOT_PATH[@]
do
 #CD into root path
 cd $val
 #Maven call to clean install
 mvn -DskipTests=true --errors -T 8 -e clean install
 #CD back up before next project
 cd ../../
done