script to create a bare git repository and fill it up with some settings to allow git to send notification emails as well as deploy the code. Save it inside the git-shell-commands directory as "create"

create-bare-repo.sh

#! /bin/bash

# usage:        create <PROJECT> - create a git bare repository named PROJECT.git
#               this command will setup the repo and send a mail for confirmation.

GITDIR="/var/git"
MULTIMAIL="/usr/doc/git-2.14.4/contrib/hooks/multimail/git_multimail.py"
GITUSER="git"
GITGRP="git"

function is_bare() {
        repodir=$1
        if "$(git --git-dir="$repodir" rev-parse --is-bare-repository)" = true
        then
                true
        else
                false
        fi
}

function git_init() {
        PROJECT=$1
        echo "creating project \"${PROJECT}.git\""
        if [ ! -d ${GITDIR}/${PROJECT}.git ]; then
                mkdir ${GITDIR}/${PROJECT}.git
        fi
        cd ${GITDIR}/${PROJECT}.git
        git init --bare
        mkdir custom-hooks
        ln -s $MULTIMAIL custom-hooks/
        touch hooks/post-receive
        cat > hooks/post-receive <<EOPR
#!/bin/sh
/usr/bin/pee ${GITDIR}/${PROJECT}.git/custom-hooks/deploy.sh \
        ${GITDIR}/${PROJECT}.git/custom-hooks/git_multimail.py

EOPR
       cat >> config <<EOT

[multimailhook]
        mailer = "sendmail"
        refchangeShowGraph = true
        mailingList = "receiver@someemail.tld"
        commitEmailFormat = "html"
        htmlInIntro = true
        htmlInFooter = true
        from = "sender@someemail.tld"
        administrator = "admin@someemail.tld"
        quiet = true
        logFile = "/var/log/multimail.log"
        errorLogFile = "/var/log/multimail_err.log"
EOT
        touch custom-hooks/deploy.sh
        cat > custom-hooks/deploy.sh <<EODP
#!/bin/bash
# Directory where to deploy files from repository
DPTARGET=""
# Directory containing repository
DPGIT_DIR="${GITDIR}/${PROJECT}.git"
# Branch that is going to be deployed to server
DPBRANCH="master"

while read oldrev newrev ref
do
        # if DPTARGET is empty we don't want deploy for this project
        if [[ ! "" == \$DPTARGET ]]; then
                # let's check that we are deploying to the correct branch
                if [[ \$ref = refs/heads/\${DPBRANCH} ]]; then
                        echo "Ref \$ref received. Deploying \${DPBRANCH} branch to production..."
                        git --work-tree=\$DPTARGET --git-dir=\$DPGIT_DIR checkout -f $DPBRANCH
                        NOW=\$(date +"%d%m%Y-%H%M")
                        git tag release_\$NOW \$DPBRANCH
                        echo "   /==============================="
                        echo "   | DEPLOYMENT COMPLETED"
                        echo "   | Target branch: \$DPTARGET"
                        echo "   | Target folder: \$DPGIT_DIR"
                        echo "   | Tag name     : release_\$NOW"
                        echo "   \=============================="
                else
                        echo "Ref \$ref received. Doing nothing: only the \${DPBRANCH} branch may be deployed on this server."
                fi
        else
                echo "Target directory not declared. Skipping deploy to server."
        fi
done

EODP
        chmod 0755 hooks/post-receive custom-hooks/deploy.sh
        cd ${GITDIR}/
        chown -R ${GITUSER}:${GITGRP} ${GITDIR}/${PROJECT}.git
        echo "All done, you can now work on \"${PROJECT}.git\""
        exit 0
}

if [ ! -z $1 ]; then
        PROJECT=$1
else
        read -p 'Project name: ' PROJECT
fi

if [ ! -d ${GITDIR}/${PROJECT}.git ]; then
        git_init $PROJECT
else
        echo "Project directory ${PROJECT}.git already exists."
        if [ $(ls -A ${GITDIR}/${PROJECT}.git) ]; then
                if is_bare ${GITDIR}/${PROJECT}.git
                then
                        echo "looks like \"${PROJECT}.git\" is an existing git project directory, choose another name."
                        exit 171
                else
                        echo "\"${PROJECT}.git\" is not empty, I can't create a Git Project in it. Choose another name."
                        exit 172
                fi
        else
                echo "\"${PROJECT}.git\" is an empty directory. Do you want to initialize a Git Project here? [y/N]"
                read answer
                case $answer in
                        Y|y)
                                git_init $PROJECT       
                                ;;
                        N|n)
                                echo "Aborting due to user request."
                                exit 173
                                ;;
                        *)
                                # we assume no as default answer.
                                echo "you said \"$answer\" which I don't understand, so to me is no. Aborting."
                                exit 177
                                ;;
                esac
        fi
fi