RE: [PATCH 3/5] wic: use E2FSPROGS_FAKE_TIME and hash_seed to generate reproducible ext4 images

[<Venkata.Pyla@toshiba-tsip.com>]

> -----Original Message-----
> From: 'MOESSBAUER, Felix' via isar-users <isar-users@googlegroups.com>
> Sent: Friday, December 8, 2023 4:04 PM
> To: isar-users@googlegroups.com; pyla venkata(ＴＳＩＰ TMIEC ODG Porting)
> <Venkata.Pyla@toshiba-tsip.com>
> Cc: Kiszka, Jan <jan.kiszka@siemens.com>; hayashi kazuhiro(林 和宏 ＤＭＥ
> ○ＤＩＧ□ＭＰＳ○ＭＰ４) <kazuhiro3.hayashi@toshiba.co.jp>; dinesh
> kumar(ＴＳＩＰ TMIEC ODG Porting) <dinesh.kumar@toshiba-tsip.com>
> Subject: Re: [PATCH 3/5] wic: use E2FSPROGS_FAKE_TIME and hash_seed to
> generate reproducible ext4 images
> 
> On Thu, 2023-12-07 at 21:11 +0530, venkata.pyla@toshiba-tsip.com wrote:
> > From: venkata pyla <venkata.pyla@toshiba-tsip.com>
> >
> > E2FSPROGS_FAKE_TIME: sets fixed times for the inodes in the file
> > system.
> > hash_seed: creates reproducible directory indexes in the file system.
> >
> > Reference commit in e2fsprogs:
> > e1f7100643a46456be107b33098f6034b0835e6d
> 
> Hi!
> 
> Did you also send this patch to OE?
> We need to integrate it there as well, as this is the basis for the ISAR plugins.

Not shared yet, I will send to OE as well.

> 
> Best regards,
> Felix
> 
> >
> > Signed-off-by: venkata pyla <venkata.pyla@toshiba-tsip.com>
> > ---
> >  scripts/lib/wic/partition.py | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> >
> > diff --git a/scripts/lib/wic/partition.py
> > b/scripts/lib/wic/partition.py index e50871b8..90b2c037 100644
> > --- a/scripts/lib/wic/partition.py
> > +++ b/scripts/lib/wic/partition.py
> > @@ -280,6 +280,17 @@ class Partition():
> >
> >          extraopts = self.mkfs_extraopts or "-F -i 8192"
> >
> > +        if os.getenv('SOURCE_DATE_EPOCH'):
> > +            sde_time = int(os.getenv('SOURCE_DATE_EPOCH'))
> > +            pseudo = "export E2FSPROGS_FAKE_TIME=%s;%s" % (sde_time,
> > pseudo)
> > +
> > +            # Set hash_seed to generate deterministic directory
> > indexes
> > +            namespace = uuid.UUID("e7429877-e7b3-4a68-a5c9-
> > 2f2fdf33d460")
> > +            if self.fsuuid:
> > +                namespace = uuid.UUID(self.fsuuid)
> > +            hash_seed = str(uuid.uuid5(namespace, str(sde_time)))
> > +            extraopts += " -E hash_seed=%s" % hash_seed
> > +
> >          label_str = ""
> >          if self.label:
> >              label_str = "-L %s" % self.label
> 
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