Updating a bash script from a repository

The following are two methods of updating a bash script from a repository

Firstly, both methods below need the following;

APP_NAME="some_name"

 

# SELF UPDATE STUFF

REPO_URL="https://gist.github.com/xxxxx/"

APP_REPO_ID="xxxxxxxxxxxxx"

OLD_APP_PREFIX="OLD"

We can also add a RUN_PATH variable as required

RUN_PATH="/usr/bin"

This is used in the example of the manual check version below.

To initiate a manual check and update;

The actual update routine;

# SELF UPDATE

function self_update()

{

echo ""

echo "Attempting to get the latest version of $APP_NAME"

git clone $REPO_URL$APP_REPO_ID.git

echo ""

if [ -f "$APP_REPO_ID/$APP_NAME" ]; then

echo "Preparing new version of $APP_NAME"

chmod +x $APP_REPO_ID/$APP_NAME

mv $RUN_PATH/$APP_NAME $RUN_PATH/$OLD_APP_PREFIX.$APP_NAME

cp $APP_REPO_ID/$APP_NAME $RUN_PATH/$APP_NAME

rm -Rf $APP_REPO_ID

echo "Please restart $APP_NAME"

echo ""

exit 0

else

echo "ERROR: Unable to retrieve and/or verify $APP_NAME"

echo "Continuing with existing version..."

fi

}

The check;

if [ -f "$RUN_PATH/$OLD_APP_PREFIX.$APP_NAME" ]; then

echo "--------------------------------------"

echo "Version: $VER successfully installed"

echo "--------------------------------------"

rm $RUN_PATH/$OLD_APP_PREFIX.$APP_NAME

echo ""

read -n 1 -s -r -p "Press any key to continue..."

fi

We need a way to initiate the update, such as an arguament when running the script as below;

if [ "$1" = "update" ]; then

self_update

exit 0

fi

To initiate an automatic check and update;

The actual update routine;

# SELF UPDATE

function self_update()

{

echo ""

echo "Attempting to get the latest version of $APP_NAME"

git clone $REPO_URL$APP_REPO_ID.git

echo ""

if [ -f "$APP_REPO_ID/$APP_NAME" ]; then

echo "Preparing new version of $APP_NAME"

chmod +x $APP_REPO_ID/$APP_NAME

mv $APP_NAME $OLD_APP_PREFIX.$APP_NAME

cp $APP_REPO_ID/$APP_NAME .

rm -Rf $APP_REPO_ID

echo "Please restart $APP_NAME"

echo ""

exit 0

else

echo "ERROR: Unable to retrieve and/or verify $APP_NAME"

echo "Continuing with existing version..."

fi

}

The decision;

function decision()

{

echo ""

echo "============================================================================"

echo "$1"

echo ""

#echo " PRESS c TO CONTINUE, s TO SKIP OR q to QUIT [c/s/q]?"

read -p " PRESS c TO CONTINUE, s TO SKIP OR q to QUIT [c/s/q]? " response

if [ "$response" = "c" ] || [ "$response" = "C" ]; then

echo "----------------------------------------------------------------------------"

return 1

elif [ "$response" = "s" ] || [ "$response" = "S" ]; then

echo "----------------------------------------------------------------------------"

return

else

echo "----------------------------------------------------------------------------"

echo ""

echo "ABORTED BY USER"

exit 0

fi

}

The check;

if [ -f "$OLD_APP_PREFIX.$APP_NAME" ]; then

echo "Skipping update, we already have the latest and greatest..."

rm $OLD_APP_PREFIX.$APP_NAME

else

decision "WOULD YOU LIKE TO GET THE LATEST VERSION OF $APP_NAME FROM IT'S GITHUB REPOSITORY?"

if [ "$?" = 1 ]; then

self_update

fi

fi