Upload a file to Google Drive, and verify that it succeeded. Useful for backups.

upload-and-verify.ps1

# first use setup: run:
#    gdrive-windows-x64.exe --config C:\programdata\GDrive about
# in order to setup auth token

# usage: backup-to-drive.ps1 -file backup_file [-delete_file] [-folder_id FOLDER_ID]
#  -delete-file switch will delete the local copy once uploaded and verified
#  -folder_id FOLDER_ID will upload to a specific folder on Google Drive (specify the ID from the URL of the folder)
#  -email_server, -email_from and -email_to can be specified for notifications, or hard-code them here.

# if backup_file is a folder, then it will upload all items within that folder (and delete all of them if specified)

param (
    [Parameter(Mandatory=$true)][string]$file,
    [switch]$delete_file,
    [string]$folder_id = $none,
    [string]$email_server = "smtp.my.domain",
    [string]$email_from = "server@my.domain",
    [string]$email_to = "notifications@my.domain"
 )

function send-error-email {
    param( [string]$message )
    Send-MailMessage -from $email_from -to $email_to -Subject "Error uploading backup on $env:computername" -body "There was an error: $message" -SmtpServer $email_server
}

try {
    $files = Get-ChildItem $file 

    foreach ($file_obj in $files) {
        $file_id = ""
        if ($folder_id) {
            $file_id = .\gdrive-windows-x64.exe --config C:\programdata\GDrive upload --no-progress -p $folder_id $file_obj.FullName | select-string -pattern "Uploaded ([^ ]*)" | % {$_.Matches.Groups[1].Value}
        } else {
            $file_id = .\gdrive-windows-x64.exe --config C:\programdata\GDrive upload --no-progress $file_obj.FullName | select-string -pattern "Uploaded ([^ ]*)" | % {$_.Matches.Groups[1].Value}
        }

        $remote_md5 = .\gdrive-windows-x64.exe --config C:\programdata\GDrive info $file_id | select-string -pattern "Md5sum: ([^ ]*)" | % {$_.Matches.Groups[1].Value}
        $local_md5 =  (Get-FileHash $file_obj.FullName -algorithm md5).Hash
        if (-not (test-path variable:remote_md5) -or $remote_md5 -eq $none -or $local_md5 -eq $none -or $remote_md5 -ne $local_md5) {
            send-error-email $file_obj.FullName
        } else {
            if ($delete_file) { #delete the file if switch was specified
              Remove-Item $file_obj.FullName
            }
        }
    }
} catch {
    send-error-email $_.Exception.Message
}