Question about mkfs.erofs and reproducible builds

[Todor Ivanov]

    Hi, Gao,

    This is how I installed mkfs.erofs on debian10:

apt-get install pkg-config liblz4-dev gawk
wget
http://ftp.debian.org/debian/pool/main/e/erofs-utils/erofs-utils_1.3.orig.tar.gz
tar xvzpf erofs-utils_1.3.orig.tar.gz
cd erofs-utils-1.3/
./autogen.sh
./configure
make
make install

Can you tell me where do I clone it from and if build instructions are
different?

Kind regards,
Todor

On Wed, Oct 27, 2021 at 2:27 PM Gao Xiang <hsiangkao at linux.alibaba.com>
wrote:

> Hi Todor,
>
> On Wed, Oct 27, 2021 at 02:11:24PM +0300, Todor Ivanov wrote:
> >         Hello,
> >
> >         We are trying to replace squashfs with erofs and face an issue
> with
> > reproducing the build from one and the same source folder. The source
> > folder is "/etc" actually taken from an offline ubuntu 20.04 image and
> > mounted as read-only.
> >         I managed to narrow down the scope and it turns out that the
> issue
> > is when you have a file starting with "." (dot) in this folder. I.e.:
> >
> > etc/.anyfilename
> >
> > If I remove this file the erofs image of "etc" is reproducible (-T and -U
> > are used as well)
> >
> > The issue is somehow related to the other 76 subfolders of etc and this
> > file starting with dot. For example if I create such .anyfilename in usr
> or
> > var, there is no issue. Also if I create this file under
> > etc/xdg/.anyfilename, this is fine as well.
> > I also tried with etc from debian10 and the result is the same. Removing
> > any file that starts with dot directly under etc, makes the erofs build
> > reproducible.
> > Do you have any advice on this?
>
> In principle filenames starting with '.' won't impact anything about
> reproducible builds...
>
> Let me investigate it now... But may I ask which erofs-utils version
> is used? Does it still happen on the latest dev branch?
>
> Thanks,
> Gao Xiang
>
> >
> > Regards,
> > Todor
>
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