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File exists and IS directory, but listFiles() returns null

The documentation for File.listFiles() suggests that null will ONLY be returned in the case that the file calling it is not a directory.

I have the following:

String dir = "/storage/emulated/0";
File f = new File(dir);
Log.v("Files",f.exists()+"");
Log.v("Files",f.isDirectory()+"");
Log.v("Files",f.listFiles()+"");

The log reads:

true
true
null

For some reason, listFiles() is returning null even though the File is recognized as a valid directory. I'm not super familiar with Android file hierarchy behavior, so I would guess the problem lies in there.

For reference, I'm debugging on my Moto X, and results are the same whether the phone is plugged in to my computer or not - so I don't think it has to do with mounting when plugged in.

Avoid having subversion modify Linux file permissions.

All of my code base is being stored in a subversion repository that I disperse amongst my load balanced Apache web servers, making it easy to check out code, run updates, and seamlessly get my code in development onto production.

One of the inconveniences that I'm sure there is a easy work around for (other than executing a script upon every checkout), is getting the Linux permissions set (back) on files that are updated or checked out with subversion. Our security team has it set that the Owner and Group set in the httpd.conf files, and all directories within the documentRoot receive permissions of 700, all non-executable files (e.g. *.php, *.smarty, *.png) receive Linux permissions of 600, all executable files receive 700 (e.g. *.sh, *.pl, *.py). All files must have owner and group set to apache:apache in order to be read by the httpd service since only the file owner is set to have access via the permissions.

Every time I run an svn update, or svn co, even though the files may not be created (i.e. svn update), I'm finding that the ownership of the files is getting set to the account that is running the svn commands, and often times, the file permissions are getting set to something other than what they were originally (i.e. a .htm file before an update is 600, but after and svn update, it gets set to 755, or even 777).

What is the easiest way to bypass subversion's attempts at updating the file permissions and ownership? Is there something that can be done within the svn client, or on the Linux server to retain the original file permissions? I'm running RHEL5 (and now 6 on a few select instances).

Setting Inheritance and Propagation flags with set-acl and powershell

I am trying to mimic the action of right-clicking on a folder, setting "modify" on a folder, and having the permissions apply to the specific folder and subfolders and files.

I'm mostly there using Powershell, however the inheritance is only being set as "subfolders and files" instead of the whole "this folder, subfolders and files".

Is there some unlisted flag for System.Security.AccessControl.PropagationFlags that will set this properly?

Here's what I'm working with so far.

$Folders = Get-childItem c:\TEMP\
$InheritanceFlag = [System.Security.AccessControl.InheritanceFlags]::ContainerInherit -bor [System.Security.AccessControl.InheritanceFlags]::ObjectInherit
$PropagationFlag = [System.Security.AccessControl.PropagationFlags]::InheritOnly
$objType = [System.Security.AccessControl.AccessControlType]::Allow 

foreach ($TempFolder in $Folders)
{
echo "Loop Iteration"
$Folder = $TempFolder.FullName

$acl = Get-Acl $Folder
$permission = "domain\user","Modify", $InheritanceFlag, $PropagationFlag, $objType
$accessRule = New-Object System.Security.AccessControl.FileSystemAccessRule $permission

$acl.SetAccessRule($accessRule)
Set-Acl $Folder $acl
} 

Ansible - Mode 755 for directories and 644 for files recursively

I'd like to allow anyone to list and read all files in my directory tree, but I don't want to make the files executable :

dir
  \subdir1
      file1
  \subdir2
      file2
  ...
  \subdirX
      fileX

The following task makes my directories and files readable, but it makes all the files executable as well:

- name: Make my directory tree readable
  file:
    path: dir
    mode: 0755
    recurse: yes

On the other hand, if I choose mode 0644, then all my files are not executable, but I'm not able to list my directories.

Is it possible to set mode 755 for all directories and 644 for all files in a directory tree?

Thank you.

How do I change read/write mode for a file using Emacs?

If a file is set to read only mode, how do I change it to write mode and vice versa from within Emacs?

Add writing permission to PHP on IIS 7

I need a PHP script to have writing permission in a directory. PHP 5.3 is running as FastCGI under IIS 7 with windows server 2008 as OP. On my php error logs, I got "permission denied" when the script attempts to write a file.

How can I sort this out? I tried to give all right to IIS_IUSR and to IUSR_myservername (with a right click on my folder) but it didn't work.

Any help would be very appreciate,

Regards,

Julien

How do I set permissions (attributes) on a file in a ZIP file using Python's zipfile module?

When I extract files from a ZIP file created with the Python zipfile module, all the files are not writable, read only etc.

The file is being created and extracted under Linux and Python 2.5.2.

As best I can tell, I need to set the ZipInfo.external_attr property for each file, but this doesn't seem to be documented anywhere I could find, can anyone enlighten me?

Maintaining file permissions across SVN updates?

I have a series of python scripts with execute permissions in Linux. They are stored in SVN.

If I then run svn up to update them, the overwritten files are back to 644 - ie no execute permissions for anyone.

Yes I could just script it to chmod +x * afterwards, but surely there's a way to store permissions in SVN or to maintain them when you update?

Any suggestions appreciated.

Laravel daily log created with wrong permissions

I have a script that I run using php artisan (with root user), and sometimes it causes the daily log file to be created before the apache www-data user does - which means that when a real user uses my web application, I get the folder permission error:

Failed to open stream: Permission denied

I change the permissions back to www-data everytime but I want to solve this by having the log file always created with the correct permissions.

I've considered creating a cron job that creates the file or touches it to make sure it has the right permission everyday, but I'm looking for a better solution that doesn't rely on another script.

We've also considered wrapping php artisan in another script to make sure that it is always run with the www-data credentials, but somethings that we want to do are actually root procedures that apache should not be allowed to do.

Any more suggestions?

Creating executable files in Linux

One thing I plan to be doing is writing (painfully simple) Perl scripts, and I'd like to be able to run them without explicitly calling Perl from the terminal. I appreciate that, to do this, I need to grant them execute permissions. Doing this with chmod is easy enough, but it also seems like a slightly laborious extra step. What I would like is one of two things:

Firstly, is there a way to set the execute flag when saving a file? Currently I'm experimenting with gedit and geany, but would be willing to switch to a similarly- (or better-) featured editor if it had this capability.

Failing that, is there a way to declare that all files created in a particular directory should have execute permissions?

My umask is set to 022, which should be OK, as far as I understand, but it would appear that the files are created as text files (with 666 default permissions) rather than executable files (with 777 default permissions).

Perhaps I'm just being lazy, but I figure there must be a more convenient way than chmodding every single script one creates.

Python: shutil.rmtree fails on Windows with 'Access is denied'

In Python, when running shutil.rmtree over a folder that contains a read-only file, the following exception is printed:

 File "C:\Python26\lib\shutil.py", line 216, in rmtree
   rmtree(fullname, ignore_errors, onerror)
 File "C:\Python26\lib\shutil.py", line 216, in rmtree
   rmtree(fullname, ignore_errors, onerror)
 File "C:\Python26\lib\shutil.py", line 216, in rmtree
   rmtree(fullname, ignore_errors, onerror)
 File "C:\Python26\lib\shutil.py", line 216, in rmtree
   rmtree(fullname, ignore_errors, onerror)
 File "C:\Python26\lib\shutil.py", line 216, in rmtree
   rmtree(fullname, ignore_errors, onerror)
 File "C:\Python26\lib\shutil.py", line 216, in rmtree
   rmtree(fullname, ignore_errors, onerror)
 File "C:\Python26\lib\shutil.py", line 216, in rmtree
   rmtree(fullname, ignore_errors, onerror)
 File "C:\Python26\lib\shutil.py", line 221, in rmtree
   onerror(os.remove, fullname, sys.exc_info())
 File "C:\Python26\lib\shutil.py", line 219, in rmtree
   os.remove(fullname)
WindowsError: [Error 5] Access is denied: 'build\\tcl\\tcl8.5\\msgs\\af.msg'

Looking in File Properties dialog I noticed that af.msg file is set to be read-only.

So the question is: what is the simplest workaround/fix to get around this problem - given that my intention is to do an equivalent of rm -rf build/ but on Windows? (without having to use third-party tools like unxutils or cygwin - as this code is targeted to be run on a bare Windows install with Python 2.6 w/ PyWin32 installed)

Storing file permissions in Subversion repository

How do you store file permissions in a repository? A few files need to be read-only to stop a third party program from trashing it but after checking out of the repository they are set to read-write.

I looked on google and found a blog post from 2005 that states that Subversion doesn't store file-permissions. There are patches and hook-scripts listed (only one url still exists). Three years later does Subversion still not store file permissions and are hooks the only way to go about this? (I've never done hooks and rather use something that is native to Subversion.)

What do I use on linux to make a python program executable

I just installed a linux system (Kubuntu) and was wondering if there is a program to make python programs executable for linux.

Can Mercurial be made to preserve file permissions?

I've seen a number of blog posts, and have experienced for myself, that Mercurial does not preserve the permissions on files pushed from one repo to another. Does anyone know of a Mercurial extension that would preserve the permissions? I'm assuming it can't be done with a hook, because what does a hook know about permissions at the originating repo?

Requested elaboration:

• If the only change to a file is a change in permissions (e.g., chmod o+r filename), attempts to commit the file fail with a message saying that the file has not changed.

• If I commit a file with permissions 600 (rw-------), then clone the repo, the same file in the clone has permissions 664 (rw-rw-r--):

  : nr@yorkie 6522 ; hg clone one two
  updating working directory
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  : nr@yorkie 6523 ; ls -l one two
  one:
  total 4
  -rw------- 1 nr nr 8 Aug 18 21:50 foo
  
  two:
  total 4
  -rw-rw-r-- 1 nr nr 8 Aug 18 21:51 foo
  

This examples shows that hg clone does not preserve permissions, but hg push does not preserve them either.

In my application, one repo is on a publically accessible path, and it's of major importance that

• Multiple users have the right to change the repo

• Files in the public repo become readable only when explicitly made readable.

How do I give PHP write access to a directory?

I'm trying to use PHP to create a file, but it isn't working. I am assuming this is because it doesn't have write access (it's always been the problem before). I tried to test if this was the problem by making the folder chmod 0777, but that just ended up making every script in that directory return a 500 error message until I changed it back. How do I give PHP write access to my file system so it can a create a file?

Edit: It is hosted on Hostgator shared hosting using Apache.

Edit 2: Someone asked for the code: The code is a GD image script. I know the rest of it works as previously I was creating the image every ime it was called. Now I am trying to create them when new text is added and save them to a folder. The write line I have is: imagejpeg(null,$file,85);

I also created a test file to check if it was just a broken script (mainly copied from tizag): http://gearboxshow.info/rkr/lesig.jpg/testfile.txt (I don't know if/how to post the code here properly. Here is the contents of the PHP script, minus PHP tags.)

It returns 13,13,1 (separate lines), so it looks as if it thinks it wrote something, but the testfile.txt is blank (I uploaded a blank one), or non-existent (if I delete it).

Edit 3: The server runs CentOS.