Bash script that will check a directory for a new commit in a remote repository, and deploy if detects an update

auto_deploy.sh

#!/bin/bash
# This script will watch a given directory with a .git checkout and execute a deployment if it detects an update. 
# You can set this up with CRON so that deployments happen automatically.
# 
# Example CRON usage:
# crontab -e
# */5 * * * * bash /path/to/scripts/deploy.sh
# 
# Example manual usage:
# bash /path/to/scripts/deploy.sh force
#

# -----------------------------------  
# PARSE ARGUMENTS
# -----------------------------------
GIT_DIR="/srv/project-name/src/"
SLACK_WEBHOOK='https://hooks.slack.com/services/XXXXXXX/XXXXXXX/XXXXXXXXXXXXXX'
REPO_URL_ROOT='https://bitbucket.org/XXXXXXX/XXXXXXXXXXXXXX/commits/'
TEST_URL='https://XXXXXXXXXXXXXX/api/'
TEST_STATUS_CODE=200

FORCE_RAW=$1
FORCE=false
if [ "$FORCE_RAW" = "force" ]; then
    FORCE=true
fi

SECONDS=0

# -----------------------------------  
# Check Current Git Status
# -----------------------------------

echo "Fetching... (Force Update? $FORCE)"
GIT_FETCH_OUTPUT=$( (git --git-dir=$GIT_DIR.git --work-tree=$GIT_DIR fetch) 2>&1)
echo "$GIT_FETCH_OUTPUT"

GIT_LOCAL_OUTPUT=$( (git --git-dir=$GIT_DIR.git --work-tree=$GIT_DIR rev-parse @{u}) 2>&1)
GIT_REMOTE_OUTPUT=$( (git --git-dir=$GIT_DIR.git --work-tree=$GIT_DIR rev-parse HEAD) 2>&1)
echo "Local is at $GIT_LOCAL_OUTPUT ... Remote is at $GIT_REMOTE_OUTPUT"

if [ $GIT_LOCAL_OUTPUT = $GIT_REMOTE_OUTPUT ] && [ $FORCE = false ]; then
    echo "Up-to-date"

else

    # -----------------------------------  
    # Notify that deployment has started
    # -----------------------------------
    SECONDS=0
    /usr/bin/curl \
        -X PUT \
        -s \
        --data-urlencode "payload={ \
            \"pretext\": \"New deployment started for $GIT_DIR\", \
            \"text\": \"Local is at $GIT_LOCAL_OUTPUT ... Remote is at $GIT_REMOTE_OUTPUT\" \
        }" \
        $SLACK_WEBHOOK

    # -----------------------------------  
    # Execute deployment
    # -----------------------------------  
    GIT_CHECKOUT_OUTPUT=$( (git --git-dir=$GIT_DIR.git --work-tree=$GIT_DIR checkout master) 2>&1)
    GIT_RESET_OUTPUT=$( (git --git-dir=$GIT_DIR.git --work-tree=$GIT_DIR reset --hard origin/master) 2>&1)
    echo "$GIT_CHECKOUT_OUTPUT"
    echo "$GIT_RESET_OUTPUT"
    

    # - Manage virtual environment
    VIRTUALENV_OUTPUT=$( ($GIT_DIR/venv/bin/pip install -r $GIT_DIR/requirements.txt) 2>&1)
    echo "$VIRTUALENV_OUTPUT"

    # - Update database
    MIGRATED_OUTPUT=$( ($GIT_DIR/venv/bin/python $GIT_DIR/manage.py migrate) 2>&1)
    echo "$MIGRATED_OUTPUT"

    # - Collect static
    STATIC_COLLECTED_OUTPUT=$( ($GIT_DIR/venv/bin/python $GIT_DIR/manage.py collectstatic --noinput) 2>&1)
    echo "$STATIC_COLLECTED_OUTPUT"

    # - Restart UWSGI app
    RESTARTED_UWSGI_OUTPUT=$( (systemctl restart emperor.uwsgi) 2>&1)
    echo "$RESTARTED_UWSGI_OUTPUT"

    # - Restart NGINX
    RESTARTED_NGINX_OUTPUT=$( (systemctl restart nginx) 2>&1)
    echo "$RESTARTED_NGINX_OUTPUT"


    # -----------------------------------  
    # Verify Success by hitting testing endpoint
    # -----------------------------------
    TEST_STATUS_CODE_OUTPUT=$(curl -s -o /dev/null -w '%{http_code}' $TEST_URL)
    echo "GET $TEST_URL : $TEST_STATUS_CODE_OUTPUT"
    if [ $TEST_STATUS_CODE_OUTPUT -eq $TEST_STATUS_CODE ]; then
        MESSAGE_COLOR="good"
    else
        MESSAGE_COLOR="danger"        
    fi

    # -----------------------------------  
    # Send completion message
    # -----------------------------------

    duration=$SECONDS
    VIEW_COMMIT_URL="$REPO_URL_ROOT$GIT_REMOTE_OUTPUT"
    
    /usr/bin/curl \
        -X PUT \
        -s \
        --data-urlencode "payload={ \
            \"attachments\": [ \
                { \
                    \"fallback\": \"Deployment complete for $GIT_DIR to $GIT_REMOTE_OUTPUT after $duration seconds.\", \
                    \"color\": \"$MESSAGE_COLOR\",\
                    \"title\": \"Deployment complete for $GIT_DIR\", \
                    \"text\": \"Deployment updated to $GIT_REMOTE_OUTPUT after $duration seconds.\", \
                    \"fields\": [ \
                        { \
                            \"title\": \"Git Update\", \
                            \"value\": \"${GIT_FETCH_OUTPUT//\"/\\\"}\n\n${GIT_CHECKOUT_OUTPUT//\"/\\\"}\n\n${GIT_RESET_OUTPUT//\"/\\\"}\"
                        }, \
                        { \
                            \"title\": \"Managed Virtual Environment\", \
                            \"value\": \"${VIRTUALENV_OUTPUT//\"/\\\"}\"
                        }, \
                        { \
                            \"title\": \"Migrated Databases\", \
                            \"value\": \"${MIGRATED_OUTPUT//\"/\\\"}\"
                        }, \
                        { \
                            \"title\": \"Collected Static Files\", \
                            \"value\": \"${STATIC_COLLECTED_OUTPUT//\"/\\\"}\"
                        }, \
                        { \
                            \"title\": \"Restarted UWSGI\", \
                            \"value\": \"${RESTARTED_UWSGI_OUTPUT//\"/\\\"}\"
                        }, \
                        { \
                            \"title\": \"Restarted NGINX\", \
                            \"value\": \"${RESTARTED_NGINX_OUTPUT//\"/\\\"}\"
                        }, \
                        { \
                            \"title\": \"Test Deployment\", \
                            \"value\": \"$TEST_URL returned $TEST_STATUS_CODE_OUTPUT\"
                        } \
                    ], \
                    \"actions\": [\
                        {\
                          \"type\": \"button\",\
                          \"text\": \"View Commit\",\
                          \"url\": \"$VIEW_COMMIT_URL\"\
                        },\
                        {\
                          \"type\": \"button\",\
                          \"text\": \"View Site\",\
                          \"url\": \"$TEST_URL\"\
                        }\
                    ]\
                } \
            ]\
        }" \
        $SLACK_WEBHOOK  
fi