24.10 deleting a child-dataset does not remove the folder

[Chris_Holzer]

24.10
I’ve been playing around with ‘immich’. Now I wanted to start fresh and for that simply delete the child dataset ‘immich’ and then create it again.

But when creating it again:

[EINVAL] pool_dataset_create.name: Path /mnt/speed/apps/immich already exists

However the dataset clearly does not exist anymore.

But the folder with all its contents still does.

So to reuse the dataset name I have to first delete the folder manually via the shell.

1. why does “delete dataset” not detele the data/folders?
2. the error message is wrong and should be changed as the dataset does not exist, but a folder with this name does

[lolo]

Had this issue before and I tried almost everything. then Install the File browser app from the store I managed to delete the folder without issue.
I think this is a glitch. Give it a try.

[Johnny_Fartpants]

I’ve not noticed this before but if it is indeed a bug why not file a bug ticket above

[DjP-iX]

This is interesting. Can you clarify the timeline and the steps you took a bit more?

I’m gathering that at some point you created a dataset for immich and then installed the app pointing at your immich dataset host path.
Then you decided to start fresh so you deleted the existing dataset.

You did this using the Datasets screen in the UI?

Had you already deleted the installed immich app before removing the dataset? If so did you use the “Remove ixVolumes” when you deleted the app?

@Chris_Holzer

1. the error message is wrong and should be changed as the dataset does not exist, but a folder with this name does

I don’t see anything wrong with the error message. It tried to create a dataset and then told you it couldn’t do that because something already exists at that path. It didn’t specify whether the object at that path was a dataset or a directory.

[winnielinnie]

@Chris_Holzer

So to reuse the dataset name I have to first delete the folder manually via the shell.

Was the folder empty or did it have something in it, like a hidden file or some cruft?

Did you have to use the rm command or did rmdir work?

[Chris_Holzer]

@DjP-iX

This is interesting. Can you clarify the timeline and the steps you took a bit more?

Sure thing!

1. Via the webgui I created the child dataset ‘immich’ inside the dataset ‘apps’
2. via the shell I created the folders required for immich inside the immich dataset: library, uploads,thumbs,profile,video,backups,postgres
3. via the webgui I added and configured immich, pointing to the folders inside the immich dataset
4. played around with immich until I decided its time to start fresh and deploy it ‘for real’
5. stopped the app via the webgui
6. via the webgui I delete the child dataset ‘immich’
7. then via the webgui tried to create it again, got the error that it already exists
8. rebooted TrueNAS
9. via the webgui tried to create it again, still got the error that it already exists
10. via the shell found that the folder ‘immich’ with all subfolders still existed
11. deleted the folder ‘immich’ using rm -r , now I could create the child dataset

@DjP-iX

Had you already deleted the installed immich app before removing the dataset? If so did you use the “Remove ixVolumes” when you deleted the app?

I did not remove the immich app - I only stopped it.

@DjP-iX

I don’t see anything wrong with the error message. It tried to create a dataset and then told you it couldn’t do that because something already exists at that path. It didn’t specify whether the object at that path was a dataset or a directory.

I should have made a screenshot of the error window in the webgui as that read ‘dataset allready exists’.

You are right that the actual error message inside the collapsed window (which I posted) is correct as it says that the path exists which is how I found out.
The error message inside the window should also say “path exists” not “dataset exists”.

[Chris_Holzer]

@winnielinnie

Was the folder empty or did it have something in it, like a hidden file or some cruft?

All the subfolders from immich were still there, I did not investigate past that. Sorry.

@winnielinnie

Did you have to use the rm command or did rmdir work?

I went with rm -r right away.

[DjP-iX]

@Chris_Holzer

• stopped the app via the webgui
• via the webgui I delete the child dataset ‘immich’

This lines up with what I was suspecting, which is that if you tried to delete the dataset without first removing the app and it’s mounted host path(s), that may have prevented a full deletion of the data.

If so there should be a way to implement some better error handling or at least a warning of the possibility.

As @Johnny_Fartpants suggested, you should submit a bug report for this and we can investigate further.

@Chris_Holzer

The error message inside the window should also say “path exists” not “dataset exists”.

Agreed. Please include that in the bug report as well.

[winnielinnie]

@Chris_Holzer

All the subfolders from immich were still there

This is probably why.

If anything exists under the path itself when the dataset (filesystem) is unmounted, then deleting the dataset will not remove the associated folder.

How anything existed under this path, that was not part of the dataset (filesystem) itself, is another question.

[Chris_Holzer]

@DjP-iX

As @Johnny_Fartpants suggested, you should submit a bug report for this and we can investigate further.

@Chris_Holzer

The error message inside the window should also say “path exists” not “dataset exists”.

Agreed. Please include that in the bug report as well.

I will have to reproduce the issue on my test system as immich is now in production my my live system.

will try to get that bugreport done over the weekend.