Listing a directory using the file system session

[Martijn Verschoor]

Dear Genode community,

I’m looking for a way to list the files (nodes) in a directory using a file system session. Amongst other, I studied the File_system::Session and file_system/utils.h but cannot find a hook to get started. I see that reading the directory nodes is supported -> this returns the Directory_entry struct with information about the directory itself, but not about the nodes the directory contains (right?). Is there a way retrieve the latter?

Any help is appreciated!

Met vriendelijke groet / kind regards,

Martijn Verschoor

Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The Netherlands
[phone] (office) | [phone] (mobile)

[Christian Helmuth]

Hello Martijn,

Post by Martijn Verschoor
I’m looking for a way to list the files (nodes) in a directory using
a file system session. Amongst other, I studied the
File_system::Session and file_system/utils.h but cannot find a hook
to get started. I see that reading the directory nodes is supported
-> this returns the Directory_entry struct with information about
the directory itself, but not about the nodes the directory contains
(right?). Is there a way retrieve the latter?

You are on the right track, that reading directory entries (like in
dirent()) is provided as read operation on directory nodes. Please
have a look at os/src/lib/vfs/fs_file_system.h for an implementation
of dirent(). The trick is to use n * sizeof(::File_system::Directory_entry)
as file_offset parameter to read the n-th entry.

Hope this helps

[Emery Hemingway]

Hello Martijn,

The File_system client in the VFS library is the only example that I can think of
for reading directory entries. I would recommend using the VFS library rather than
using a File_system session directly, the library is easier to use and this would
give you a lot more power for free, such as merging the same directory present in
multiple File_system sessions.

https://github.com/genodelabs/genode/blob/master/repos/os/src/lib/vfs/fs_file_system.h#L279

Cheers,
Emery Hemingway

Post by Martijn Verschoor
Dear Genode community,
I’m looking for a way to list the files (nodes) in a directory using a file system session. Amongst other, I studied the File_system::Session and file_system/utils.h but cannot find a hook to get started. I see that reading the directory nodes is supported -> this returns the Directory_entry struct with information about the directory itself, but not about the nodes the directory contains (right?). Is there a way retrieve the latter?
Any help is appreciated!
Met vriendelijke groet / kind regards,
Martijn Verschoor
Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The Netherlands
[phone] (office) | [phone] (mobile)
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[Nobody III]

I have written a file manager for Genode, so that could be useful if you
don't want to use the VFS system. It's part of my work on a desktop
environment, and it's not entirely complete, but it should be fairly usable
still. If you want to use that as a starting point, here's a link:
https://github.com/NobodyIII/genode-desktop-environment

Here's the specific file with the _dir() function:
https://github.com/NobodyIII/genode-desktop-environment/blob/master/src/app/file_manager/genodefs.cpp

Post by Christian Helmuth
Hello Martijn,
The File_system client in the VFS library is the only example that I can think of
for reading directory entries. I would recommend using the VFS library rather than
using a File_system session directly, the library is easier to use and this would
give you a lot more power for free, such as merging the same directory present in
multiple File_system sessions.
https://github.com/genodelabs/genode/blob/master/repos/os/
src/lib/vfs/fs_file_system.h#L279
Cheers,
Emery Hemingway

Post by Martijn Verschoor
Dear Genode community,
I’m looking for a way to list the files (nodes) in a directory using a

file system session. Amongst other, I studied the File_system::Session and
file_system/utils.h but cannot find a hook to get started. I see that
reading the directory nodes is supported -> this returns the
Directory_entry struct with information about the directory itself, but not
about the nodes the directory contains (right?). Is there a way retrieve
the latter?

Post by Martijn Verschoor
Any help is appreciated!
Met vriendelijke groet / kind regards,
Martijn Verschoor
Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The

Netherlands

Post by Martijn Verschoor
[phone] (office) | [phone] (mobile)
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------------------

Post by Martijn Verschoor
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[Martijn Verschoor]

Dear Genode community,

Christian, Emery, NobodyIII, thanks for your suggestions.

I see the benefit for using the VFS library, but for the component I’m working on right now, using a file system session directly is more appropriate. Therefore I implemented the functionality of listing the directory entries similar to the dirent() implementation for VFS as hinted by Christian. This works like a charm.

Met vriendelijke groet / kind regards,

Martijn Verschoor

Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The Netherlands
[phone] (office) | [phone] (mobile)