gcloud components update runs a long time. Should include in the message that you will back up sdk and the size to warn the user

[GoogleCodeExporter]

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What steps will reproduce the problem?
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1) run "gcloud components update"

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What is the expected output? What do you see instead?
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It shows:
>gcloud components update

The following components will be updated:
    ---------------------------------------------------------
    | Cloud SDK Core Libraries        | 2014.07.21 | < 1 MB |
    | Cloud Storage Command Line Tool |        4.4 | 2.1 MB |
    ---------------------------------------------------------

Do you want to continue (Y/n)?  y

Creating update staging area...

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What is the output of 'gcloud info'?
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It runs a long time.

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Please provide any additional information below.
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When I look at the staging area I see:

>du -sh "\tmp\google-cloud-sdk.staging"
197M    \tmp\google-cloud-sdk.staging

It appears that it backs up the existing sdk and that takes a long time.

Thanks

Original issue reported on code.google.com by fed...@gmail.com on 24 Jul 2014 at 6:24

[GoogleCodeExporter]

We're working on ways to improve the update time.

Original comment by jasm...@google.com on 14 Aug 2014 at 1:58

• Changed state: Accepted

[GoogleCodeExporter]

Original comment by rdayal@google.com on 27 Aug 2014 at 1:40

[GoogleCodeExporter]

Is it correct to take hours and hours, despite being so small files like this 
example?

---------------------------------------------------------
    | Cloud SDK Core Libraries        | 2014.07.21 | < 1 MB |
    | Cloud Storage Command Line Tool |        4.4 | 2.1 MB |
    ---------------------------------------------------------

Original comment by ivanetec...@gmail.com on 19 Nov 2014 at 8:26