Bash script to backup data to google drive

I want to create a bash script that will log into my google drive account and backup my main folder. I've done a bit of research and I know we need some sort of OAuth for using the Google Drive API but I'm still fairly new so I thought I can get some solid guidance from the stack community.

I guess you don't need to re-invent the wheel, use gdrive and you're good to go

SETUP:

wget -O drive "https://drive.google.com/uc?id=0B3X9GlR6EmbnMHBMVWtKaEZXdDg"  
mv drive /usr/sbin/drive  
chmod 755 /usr/sbin/drive 

Now, simply run drive to start the authentication process. You'll get a link like this to paste and browse to in to your web browser:

Go to the following link in your browser:  
https://accounts.google.com/o/oauth2/auth?client_id=123456789123-7n0vf5akeru7on6o2fjinrecpdoe99eg.apps.googleusercontent.com&redirect_uri=urn%3Aietf%3Awg%3Aoauth%3A2.0%3Aoob&response_type=code&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fdrive&state=state 

Authenticate and provide permission for the application to access your Google Drive, and then you'll be provided a verification code to copy and paste back in to your shell:

Enter verification code: 4/9gKYAFAJ326XIP6JJHAEhs342t35LPiA5QGW0935GHWHy9  

---

USAGE:

drive upload --file "/some/path/somefile.ext" 

---

SRC:

Backing up a Directory to Google Drive on CentOS 7

---

NOTE:

If you really want to build a bash script take a look at this gist , i.e.:

• automatically gleans MIME type from file
• uploads multiple files
• removes directory prefix from filename
• works with filenames with spaces
• uses dotfile for configuration and token
• interactively configuring
• uploads to target folder if last argument looks like a folder id
• quieter output
• uses longer command line flags for readability
• throttle by adding curl_args="--limit-rate 500K" to $HOME/.gdrive.conf

---

#!/bin/bash
# based on https://gist.github.com/deanet/3427090
#
# useful $HOME/.gdrive.conf options:
#    curl_args="--limit-rate 500K --progress-bar"


browser="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36"

destination_folder_id=${@: -1}
if expr "$destination_folder_id" : '^[A-Za-z0-9]\{28\}$' > /dev/null
then
    # all but last word
    set -- "${@:0:$#}"
else
    # upload to root
    unset destination_folder_id
fi

if [ -e $HOME/.gdrive.conf ]
then
    . $HOME/.gdrive.conf
fi

old_umask=`umask`
umask 0077

if [ -z "$username" ]
then
    read -p "username: " username
    unset token
    echo "username=$username" >> $HOME/.gdrive.conf
fi

if [ -z "$account_type" ]
then
    if expr "$username" : '^[^@]*$' > /dev/null || expr "$username" : '.*@gmail.com$' > /dev/null
    then
        account_type=GOOGLE
    else
        account_type=HOSTED
    fi
fi

if [ -z "$password$token" ]
then
    read -s -p "password: " password
    unset token
    echo
fi

if [ -z "$token" ]
then
    token=`curl --silent --data-urlencode Email=$username --data-urlencode Passwd="$password" --data accountType=$account_type --data service=writely --data source=cURL "https://www.google.com/accounts/ClientLogin" | sed -ne s/Auth=//p`
    sed -ie '/^token=/d' $HOME/.gdrive.conf
    echo "token=$token" >> $HOME/.gdrive.conf
fi
umask $old_umask

for file in "$@"
do
    slug=`basename "$file"`
    mime_type=`file --brief --mime-type "$file"`
    upload_link=`curl --silent --show-error --insecure --request POST --header "Content-Length: 0" --header "Authorization: GoogleLogin auth=${token}" --header "GData-Version: 3.0" --header "Content-Type: $mime_type" --header "Slug: $slug" "https://docs.google.com/feeds/upload/create-session/default/private/full${destination_folder_id+/folder:$destination_folder_id/contents}?convert=false" --dump-header - | sed -ne s/"Location: "//p`
    echo "$file:"
    curl --request POST --output /dev/null --data-binary "@$file" --header "Authorization: GoogleLogin auth=${token}" --header "GData-Version: 3.0" --header "Content-Type: $mime_type" --header "Slug: $slug" "$upload_link" $curl_args
done