[jira] [Commented] (CB-7253) window.requestFileSystem fails when no sd card is present and non-zero value is provided for size

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CB-7253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14983297#comment-14983297 ] 

ASF GitHub Bot commented on CB-7253:
------------------------------------

GitHub user jasongin opened a pull request:

    https://github.com/apache/cordova-plugin-file/pull/145

    CB-7253: requestFileSystem fails when no external storage is present

    There were 2 issues behind this bug:
    1) DirectoryManager.getFreeDiskSpace() used an incorrect way of
    checking the free internal storage space: using a path of "/" would
    always result in 0 reported free space.
    2) When checking whether requested space was available, the
    requestFileSystem() method would always check the external storage
    space and fallback to internal storage space, regardless of what
    type of filesystem (external, internal, or other) was being requested.
    
    To fix both of these issues, I've added a new getFreeSpaceInBytes() method
    on the FileSystem base class, which is called on the actual filesystem
    instance being retrieved by requestFileSystem(). The new method for
    getting free space always uses the filesystem's correct root path, so
    it works for internal, external or any other Android storage filesystem.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/jasongin/cordova-plugin-file CB-7253

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/cordova-plugin-file/pull/145.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #145
    
----
commit 4097a9855653aaf7f62806c06f1ae0502a29fbad
Author: Jason Ginchereau <ja...@microsoft.com>
Date:   2015-10-30T20:15:47Z

    CB-7253: requestFileSystem fails when no external storage is present
    
    There were 2 issues behind this bug:
    1) DirectoryManager.getFreeDiskSpace() used an incorrect way of
    checking the free internal storage space: using a path of "/" would
    always result in 0 reported free space.
    2) When checking whether requested space was available, the
    requestFileSystem() method would always check the external storage
    space and fallback to internal storage space, regardless of what
    type of filesystem (external, internal, or other) was being requested.
    
    To fix both of these issues, I've added a new getFreeSpaceInBytes() method
    on the FileSystem base class, which is called on the actual filesystem
    instance being retrieved by requestFileSystem(). The new method for
    getting free space always uses the filesystem's correct root path, so
    it works for internal, external or any other Android storage filesystem.

----


> window.requestFileSystem fails when no sd card is present and non-zero value is provided for size
> -------------------------------------------------------------------------------------------------
>
>                 Key: CB-7253
>                 URL: https://issues.apache.org/jira/browse/CB-7253
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: Plugin File
>    Affects Versions: 3.5.0
>         Environment: I discovered this issue on a Nexus7 emulator running android 4.4.2 with no sd card.
>            Reporter: Vincent Scuorzo
>            Assignee: Jason Ginchereau
>            Priority: Minor
>              Labels: easyfix
>
> The problem is that when no external storage is present the size parameter is compared to the available storage space on the internal file system which is incorrectly reported as 0. After reading a post on stack overflow (http://stackoverflow.com/questions/4799643/getting-all-the-total-and-available-space-on-android) I noticed that they were checking available space in a different way so I tried it and the issue went away.
> You can see this bug in action by setting up an emulator as I described and running an app with the file plugin that can execute the following javascript:
> window.requestFileSystem(PERSISTENT, 1024, function(fs){ console.log(fs); }, function(e){ console.log(e); });
> With the current release you will get an error related to reaching the storage quota since the available space is reported incorrectly. Change line 72 of src/android/DirectoryManager.java to read the following:
> freeSpace = freeSpaceCalculation(Environment.getRootDirectory().getAbsolutePath());
> Run the same line of javascript as before and you will now have success, assuming you actually have the available space.
> You can easily bypass this issue and access the filesystem by just passing 0 for the size but doing so will also circumvent the checks that ensure you don't try to use more space than is available. In my case, my app was handicapping itself because it thought it didn't have enough space to download additional resources when it should not have had any issues.



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