An issue with erofsfuse

[Igor Eisberg]

You're quicker than expected, thanks for answering.
Not sure how to check if lz4 was builtin, but considering that erofsfuse is
only about 34.5KB (stripped) I would guess not?
Here's the output of erofsfuse -d (it prints this but never exists back to
shell unless I do Ctrl+C):

erofsfuse 1.3
>
> disk: product.img
>
> mountpoint: product-mnt
>
> dbglevel: 7
>
> FUSE library version: 2.9.9
>
> nullpath_ok: 0
>
> nopath: 0
>
> utime_omit_ok: 0
>
> unique: 1, opcode: INIT (26), nodeid: 0, insize: 56, pid: 0
>
> INIT: 7.27
>
> flags=0x003ffffb
>
> max_readahead=0x00020000
>
> EROFS: erofsfuse_init() Line[23] Using FUSE protocol 7.27
>
>    INIT: 7.19
>
>    flags=0x00000011
>
>    max_readahead=0x00020000
>
>    max_write=0x00020000
>
>    max_background=0
>
>    congestion_threshold=0
>
>    unique: 1, success, outsize: 40
>
>
On Fri, 20 Aug 2021 at 15:49, Gao Xiang <xiang at kernel.org> wrote:

> Hi Igor,
>
> On Fri, Aug 20, 2021 at 03:34:05PM +0300, Igor Eisberg wrote:
> > Hey there, getting straight to the point.
> > Our team is using Debian 10, in which erofs mounting is not supported and
> > we have no option of updating the kernel, nor do we have sudo permissions
> > on this server.
> >
> > Our only choice is to use erofsfuse to mount an Android image
> (compression
> > was used on that image), for the sole purpose of extracting its contents
> to
> > another folder for processing.
> > Tried on Debian 10, pop_OS! and even the latest Kubuntu (where native
> > mounting is supported), but on all of them I could not copy files which
> are
> > compressed from the mounted image to another location (ext4 file system).
> >
> > The error I'm getting is: "Operation not supported (95)"
> >
>
> Thanks for your feedback.
>
> Could you check if lz4 was built-in when building erofsfuse? I guess
> that is the reason (lack of lz4 support builtin).
>
> If not, could you add -d to erofsfuse when starting up?
>
> Thanks,
> Gao Xiang
>
> > Notes:
> > * Only extremely small (< 1 KB) files which are stored uncompressed are
> > copied successfully.
> > * Copying works perfectly when mounting the image with "sudo mount" on
> the
> > latest Kubuntu, so it has to be something with erofsfuse.
> >
> > Anything you can do to help resolve this?
> >
> > Best,
> > Igor.
>
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