useradd  gitrepo
echo "gitrepo:gitrepo" |chpasswd

su - gitrepo
mkdir test1.git
cd test1.git
git init --bare --share

mkdir test1
cd test1

git init
echo "git test" > readme
git add .
git commit -m "first commit"
git remote add origin ssh://x.x.x.x/home/gitrepo/testproject.git
git push origin master

git clone ssh://x.x.x.x/home/gitrepo/test1.git
echo "test" >> readme
git add .
git commit -m "change test"
git push origin master
git status

Reference : 4.6 Git on the Server - Smart HTTP

cd /opt/git
git init --bare --shared project.git
chown -R apache:apache project.git

SetEnv GIT_PROJECT_ROOT /opt/git
SetEnv GIT_HTTP_EXPORT_ALL
ScriptAlias /git/ /usr/lib/git-core/git-http-backend/

RewriteEngine On
RewriteCond %{QUERY_STRING} service=git-receive-pack [OR]
RewriteCond %{REQUEST_URI} /git-receive-pack$
RewriteRule ^/git/ - [E=AUTHREQUIRED]

<Files "git-http-backend">
    AuthType Basic
    AuthName "Git Access"
    AuthUserFile /opt/git/.htpasswd
    Require valid-user
    Order deny,allow
    Deny from env=AUTHREQUIRED
    Satisfy any
</Files>

htpasswd -c /opt/git/.htpasswd  user01

git clone http://x.x.x.x/project.git .
ls project

Git - How to use Git.