On 2021/8/20 21:16, Igor Eisberg wrote:
> 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):
>
You can use lz4 --version to check the version of lz4 library, I have 
got the same error on the old version, better to use the version above 
1.9.2.

If the problem still exists, you can use the -d --dbglevel=9 option, and 
then perform a read to get the detailed log.

Thanks,

Jianan

>         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@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.
>