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 <[email protected]> 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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