Posted By

swetoast on 05/11/16

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Last Edited at 05/11/16 01:53am

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Selfupdating Script

/ Published in: Bash

Simple script that updates itself upon launch then lauches whatever else thats included afterwards works well in almost any linux system tested on busyboxes and Debian systems

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#!/bin/sh
SELF=$(basename $0)                                                 #uses the same name as the file
UPDATE_BASE=https://gitlab.com/swe_toast/self-update/raw/master/    #dont link directly to file link to the folder
UPDATE_SELF=${UPDATE_SELF:-1}

self_updater () {
        echo "Performing self-update... Please wait..."
if      ! wget --quiet --output-document="$0.tmp" $UPDATE_BASE/$SELF ;
then    echo "Failed downloading new version!"
        echo "File requested: $UPDATE_BASE/$SELF"
        exit 1
fi

OCTAL_MODE=$(stat -c '%a' $0)
    case ${OCTAL_MODE:--1} in
        -[1] )          echo "Failed: Error : OCTAL_MODE was empty"; exit 1 ;;
        777|775|755 )   echo "OCTAL mode set:${OCTAL_MODE}" ;;
        * )             echo "Failed: Error in OCTAL_MODEs, found value=${OCTAL_MODE}" exit 1 ;;
    esac

if      ! chmod $OCTAL_MODE $0.tmp ;
then    echo "Error on chmod $OCTAL_MODE %0.tmp from $UPDATE_BASE/$SELF, can't continue"
        exit 1
fi

cat > /tmp/updatescript.sh << EOF
#!/bin/sh
if mv "$0.tmp" "$0";
then    echo "Update complete.."
        exec env UPDATE_SELF=0 /bin/sh "$0"
        rm \$0
else    echo "Update failed.."
fi
EOF
        echo "Inserting update process..."
            exec /bin/sh /tmp/updatescript.sh; rm /tmp/updatescript.sh
}

check_update () { if [ ${UPDATE_SELF} -ne 0 ]; then self_updater; fi }

check_update

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