Question about mkfs.erofs and reproducible builds

[Todor Ivanov]

   Hi, Gao,

   Indeed c_version:[1.3-g9fe440d0], seems to fix the problem :) Thank you
very much for the prompt and accurate feedback! Do you think we can use the
dev branch for our images or is it better until it is merged into master?
What do you think?

Kind regards,
Todor


On Wed, Oct 27, 2021 at 2:51 PM Gao Xiang <hsiangkao at linux.alibaba.com>
wrote:

> On Wed, Oct 27, 2021 at 02:41:54PM +0300, Todor Ivanov wrote:
> >     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?
>
> You could get the latest dev branch from:
> git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git -b dev
>
> We fixed some reproducable build issues recently, I think it might
> be related to
>
> https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git/commit/?id=6324fac820c28c6a946f595fa58a0abba0f48eb4
>
> Thanks,
> Gao Xiang
>
> >
> > 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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