gcloud-download.py

Usage: ./gcloud-download.py gs://<bucket>/mydir /some/path
optional arguments:
        --parallel Concurrent async download.
        -h or --help This output.

Normal Invocation:

./gcloud-download.py gs://<bucket>/mydir ab

Copies sequentially like

"mydir" folder structure is as follows:
mydir/
mydir/a/
mydir/a/1.txt
mydir/a/b/
mydir/a/b/2.txt

Resultant folder structure.

$pwd/ab/mydir/
$pwd/ab/mydir/a/
$pwd/ab/mydir/a/1.txt
$pwd/ab/mydir/a/b/
$pwd/ab/mydir/a/b/2.txt

--concur Invocation:

* Calls async/await to create tasks and downlaod.

* It however uses a sync function to create directories to avoid race condition.