[Ovmsdev] VFS rm

[Stephen Casner]

On Sun, 6 Dec 2020, Tamás Kovács wrote:

> Any idea how to remove these files?
> "OVMS# vfs ls /store/usr
>
>      64   12-Sep-1965 06:34  ????????.???
>      64   12-Sep-1965 06:34  ????????.???
>      64   12-Sep-1965 06:34  ????????.???

The filesystem is corrupted.  This happened to me in 2018.  Below is
an edited thread of messages about this from ovmsdev list.

                                                        -- Steve

From: Stephen Casner <casner at acm.org>

I know that I can use "config backup" to back up the config to SD.
Does the re-format step mean "module factory reset"?

                                                        -- Steve

From: Michael Balzer <dexter at expeedo.de>

Yes.

You might consider saving the flash partition for further bug analysis before erasing it:
https://docs.google.com/document/d/1q5M9Lb5jzQhJzPMnkMKwy4Es5YK12ACQejX_NWEixr0/edit#heading=h.o79tlr919yab

Regards,
Michael

From: Stephen Casner <casner at acm.org>

I will save the flash partition as you suggest.

Also, in your message telling about the addition of the config
backup/restore function you said the backup covers the directories
"ovms_config" and "events" from "/store".  I note that /store also
contains a .htpasswd file.  Should that also be included, or is it
already?

                                                        -- Steve

From: Michael Balzer <dexter at expeedo.de>

The .htpasswd file is generated automatically by the webserver from the password config.

Regards,
Michael

From: Stephen Casner <casner at acm.org>

What kind of <path> is expected in "config backup <path>"?  I tried
"/sd/config-20181221.zip" and "config-20181221.zip" but both resulted
in "Error: zip failed: No such file or directory".  Manually creating
the empty file "/sd/config-20181221.zip" first did not help.

                                                        -- Steve

From: Michael Balzer <dexter at expeedo.de>

I missed the case of a non-existent "/store/events" directory.

I'll fix that now, to backup without updating, do "vfs mkdir /store/events".

Regards,
Michael

From: Stephen Casner <casner at acm.org>

Michael,

Glad you figured that out.  I had looked at the code to see if that
gave me any hints as to what kind of <path> argument was required, but
I could not tell from the code where the error was occurring.

I notice that some other commands use <vfspath> for the help string to
be more specific.  Would that be a good idea for config backup?

                                                        -- Steve

From: Stephen Casner <casner at acm.org>

On Fri, 21 Dec 2018, Michael Balzer wrote:
> You might consider saving the flash partition for further bug
> analysis before erasing it
> https://docs.google.com/document/d/1q5M9Lb5jzQhJzPMnkMKwy4Es5YK12ACQejX_NWEixr0/edit#heading=h.o79tlr919yab

I finally got around to fixing the corrupted /store filesystem on my
OVMS v3.0 module.  I did save the partition first, as directed by the
section of the OVMS v3 Developer Guide to which the reference above
points.  I also updated the instructions there to add an example of
how to mount the saved filesystem on macOS rather than Linux.

Looking at the whole filesystem as a raw binary file, I see that the
sector at 0x00002000 is all 0xFFs.  I don't know if that is what
caused the "vfs ls /store" command to show 128 invalid directory
entries, but after erasing the flash and rebuilding the /store
filesystem and then saving the flash partition to another file on my
Mac, there is not a sector of 0xFF like that.

Running fsck_msdos on the broken filesystem (as attached on macOS)
only shows orphaned clusters, not any invalid directory entries:

auge16> fsck_msdos /dev/disk11
** /dev/rdisk11
** Phase 1 - Preparing FAT
** Phase 2 - Checking Directories
** Phase 3 - Checking for Orphan Clusters
Found orphan cluster(s)
Fix? [yn] n
Found 25 orphaned clusters
19 files, 800 KiB free (200 clusters)
** Phase 1 - Preparing FAT
** Phase 2 - Checking Directories
** Phase 3 - Checking for Orphan Clusters
Found orphan cluster(s)
Fix? [yn] n
Found 25 orphaned clusters
19 files, 1600 KiB free (400 clusters)
** Phase 1 - Preparing FAT
** Phase 2 - Checking Directories
** Phase 3 - Checking for Orphan Clusters
Found orphan cluster(s)
Fix? [yn] n
Found 25 orphaned clusters
19 files, 2400 KiB free (600 clusters)
auge17>

                                                        -- Steve