removable drive seen in debbugger although i filter it.

Dani_S 3,336

hi,

i used this code and i see removable drive in debugger, why?

I used mac.

DriveInfo[] drives = DriveInfo.GetDrives();

drives = drives.Where(drive=> drive.DriveType != DriveType.Removable && drive.DriveType != DriveType.CDRom).ToArray();

Thanks,

Viorel 114.7K Reputation points

2024-05-30T12:22:30.3466667+00:00

Maybe it is not removable.

Did you analyze the objects from drives collection before and after the Where line?
Dani_S 3,336 Reputation points

2024-05-30T12:35:14.07+00:00

In window it works in MAC is not working
Dani_S 3,336 Reputation points

2024-05-30T12:38:00.2033333+00:00

i tried this code also not working:

DriveInfo[] drives = DriveInfo.GetDrives();

drives = drives.Where(drive=> drive.Name == "//").ToArray();
Dani_S 3,336 Reputation points

2024-05-30T12:41:26.13+00:00

here i got nothing

1 answer

Bruce (SqlWork.com) 61,731 Reputation points

2024-05-30T18:17:04.4466667+00:00

DriveInfo.GetDrives() is returning mount information. It list all known mounts (physical or image). the unix call statfs() is used to get the volume information for the mount point.

the .Name and .RootDirectory will return the mount point. typically "/System/Volumes/<volume name>". but the mount point can be anywhere. a user may create "/System/Volumes/Usb" folder and mount usb drives there. The IOS simulator disk images are mounted under "/Library/Developer/CoreSimulator/Volumes/". would not expect:

drives = drives.Where(drive=> drive.Name == "//").ToArray();

to return any values as "//" is not a typical path or mount point.

the .DriveType is a mapping of the unix file system type. for example "iso", "cd9660" are mapped to DriveType.CDRom. see code:

https://github.com/dotnet/runtime/blob/main/src/libraries/Common/src/Interop/Unix/System.Native/Interop.MountPoints.FormatInfo.cs#L43

note: because the file system type is used to determine DriveType.Removable, it is not reliable. a fat formatted usb volume would be .Removable, but an apfs formatted usb volume would not.
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Dani_S 3,336 Reputation points

2024-06-02T10:32:27.2966667+00:00

I want to copy files from source to destination.

while source can't be usb or cdrome, and destination can be anything.

When there is no filter of where on get all drives in source i got long list of volumes

and some inner dolder behave recursively why?

So, how i get all the mounths that are not CDRom and not USB in CSharp? Can you please specify which volumes are relavant for copy operation without CDRome & USB?

"/System/Volumes/Data" only?

Dani_S 3,336 Reputation points

2024-06-02T12:16:15.87+00:00

..........................

Bruce (SqlWork.com) 61,731 Reputation points

2024-06-02T16:40:39.4766667+00:00

As I said, DriveInfo.GetDrives() is returning mount points not drives. Mount points can be anywhere in the file system, and is customizable by the user. It determines drive type from the volume format type.

if you want actual drive information you need to fork a system utility and parse output (standard Unix approach) or use IOKit sdk.

note: the Unix approach is to chain applications more than use sdks. The o/s was designed to make this fast and efficient. The only real issue the two flavors of system utilities, system v and Berkeley (bsd). Linux is system v and MacOs is Berkeley.

it’s unfortunate that the command execution and stdout redirection in .net core is based on windows api rather than the simple Unix api.

https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/popen.3.html

Dani_S 3,336 Reputation points

2024-06-02T18:20:24.5666667+00:00

How I use Unix api , my Maui app is written in csharp?

Dani_S 3,336 Reputation points

2024-06-05T07:21:43.3566667+00:00

Can you plaese answer ?

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 39,391 Reputation points Microsoft Vendor

2024-06-05T08:30:15.94+00:00

After testing, it is not feasible to directly reference Unix commands in C#.

In Unix-like systems, all mount points are accessed through a common root file path. For your needs to filter CDroom and USB, you can use the path prefix to determine whether it is a user's personal directory. You can filter other mount points in this way.

Dani_S 3,336 Reputation points

2024-06-05T08:45:32.3733333+00:00

can you give an example ? i do not undersand your solution.

Dani_S 3,336 Reputation points

2024-06-06T07:37:15.43+00:00

you can use the path prefix to determine whether it is a user's personal directory. You can filter other mount points in this way.

can you give an example ? i do not undersand your solution

Bruce (SqlWork.com) 61,731 Reputation points

2024-06-06T17:37:17.2866667+00:00

you can use the environment variable HOME to get the users default folder.

var homeDir = Environment.GetEnvironmentVariable("HOME");

the most common approach to detect mounted usb volume is to check if the volume filesystem is fat32, like DriveInfo.GetDrives() does.

If I understand you are writing a some sort of backup. Macs users unlike Windows users have little notion of drives. If they insert USB, it auto mounts and a link is added to the desktop. In finder its under locations by its name. its the same with a network drive or even external hard drive.

to write a CD, its a two step process. you create a temporary folder system to match what you want the CD directory to look like, then you execute the burn using this as the source. as most Macs do not have a CD, this is a pretty uncommon operation. If you need a lot control, you will need to use IOKit.
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removable drive seen in debbugger although i filter it.

1 answer