pcloud: allow configuration of root folder ID

[hfornazier]

What is your current rclone version (output from rclone version)?

v1.51.0

What problem are you are trying to solve?

To define a variable in rclone.config to indicate which folder should be accessed.

How do you think rclone should be changed to solve that?

Rclone already has access to the PCloud Root.

There is already a constant "rootID" in the code, however, I believe that currently it always accesses Pcloud folder 0 (zero).

PCloud works on its API with a number of folders.

If the user can enter the "rootID" the folder number would be very interesting to preserve the entire file structure in the cloud.

This way, even if the rclone.config file is exposed on a PC, the user would only have access to that folder.

This would be excellent already, and in the future we could even use a "rootFolder = / Tests" so that the user could put the name of the Home folder.

[hfornazier]

[ncw]

This would make a nice issue for someone wanting to get into rclone development. There is a free tier for pcloud accounts.

To implement this a new parameter root_folder_id needs to be added to the backend (named like that for consistency with the other backends). For example like this one in the drive backend, but with the default "d0". This needs docs on how to find the root_folder_id.

rclone/backend/drive/drive.go

Lines 213 to 224 in ec12718

	}, {
	Name: "root_folder_id",
	Help: `ID of the root folder
	Leave blank normally.
	Fill in to access "Computers" folders (see docs), or for rclone to use
	a non root folder as its starting point.
	Note that if this is blank, the first time rclone runs it will fill it
	in with the ID of the root folder.
	`,
	}, {

This needs to be defined in the Options struct as RootFolderID string config:"root_folder_id"`

rclone/backend/pcloud/pcloud.go

Lines 97 to 99 in ec12718

	type Options struct {
	Enc encoder.MultiEncoder `config:"encoding"`
	}

Then all uses of rootID, need to be replaced with f.opt.RootFolderID

rclone/backend/pcloud/pcloud.go

Line 45 in ec12718

rootID = "d0" // ID of root folder is always this

[Sunil-P]

I'll start getting this done, I imagine this is similar to #3422

[ncw]

I've merged @Sunil-P 's fix for this to master now which means it will be in the latest beta in 15-30 mins and released in v1.52

Thank you @Sunil-P