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spf=pass (google.com: domain of adithya.balakumar@toshiba-tsip.com designates 210.130.202.158 as permitted sender) smtp.mailfrom=Adithya.Balakumar@toshiba-tsip.com Precedence: list Mailing-list: list isar-users@googlegroups.com; contact isar-users+owners@googlegroups.com List-ID: X-Spam-Checked-In-Group: isar-users@googlegroups.com X-Google-Group-Id: 914930254986 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Status: No, score=-4.6 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE, MAILING_LIST_MULTI,RCVD_IN_MSPIKE_H2,RCVD_IN_RP_CERTIFIED, RCVD_IN_RP_RNBL,RCVD_IN_RP_SAFE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on shymkent.ilbers.de X-TUID: li/u/N8Lmdu3 --_000_TYCPR01MB966943B203E939D178024C33C4A22TYCPR01MB9669jpnp_ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I tried understanding the root cause of this issue, When there is a differe= nce in the ROOTFS_SIZE, I see that some of the files in the rootfs tree has= different number of blocks allocated to the file. I say "some" files because the files/directories that are affected are not = the same in every build. For instance, I am attaching an example below wher= e the man8 directory using different number of blocks despite having the sa= me size according to the stat command Build1: host:~/work/isar-cip-core$ stat build/tmp/work/cip-core-bookworm-armhf/cip-= core-image-bbb/1.0-r0/rootfs/usr/share/man/man8 File: build3/tmp/work/cip-core-bookworm-armhf/cip-core-image-bbb/1.0-r0/r= ootfs/usr/share/man/man8 Size: 24576 Blocks: 56 IO Block: 4096 directory Device: 802h/2050d Inode: 26428993 Links: 2 Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2024-07-15 15:29:02.560481148 +0530 Modify: 2024-06-24 11:13:41.000000000 +0530 Change: 2024-07-15 15:29:01.376474194 +0530 Birth: - Build2: host:~/work/isar-cip-core$ stat build2/tmp/work/cip-core-bookworm-armhf/cip= -core-image-bbb/1.0-r0/rootfs/usr/share/man/man8 File: build4/tmp/work/cip-core-bookworm-armhf/cip-core-image-bbb/1.0-r0/r= ootfs/usr/share/man/man8 Size: 24576 Blocks: 48 IO Block: 4096 directory Device: 802h/2050d Inode: 26027389 Links: 2 Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2024-07-15 15:55:17.458599845 +0530 Modify: 2024-06-24 11:13:41.000000000 +0530 Change: 2024-07-15 15:55:16.270589701 +0530 Birth: - Using the "du" command to measure the size of the rootfs directory in such = a case, yields different values for the ROOTFS_SIZE. I noticed that, openembedded core uses a custom function to measure the dir= ectory size, See [1] and [2]. Using the same function in isar seems to sove= s this problem based on my tests. Any thoughts? [1] https://github.com/openembedded/openembedded-core/blob/master/meta/clas= ses-recipe/image.bbclass#L559 [2] https://github.com/openembedded/openembedded-core/blob/master/meta/lib/= oe/utils.py#L502 From: balakumar adithya(=EF=BC=B4=EF=BC=B3=EF=BC=A9=EF=BC=B0 TEUR) Sent: Thursday, July 4, 2024 8:01 PM To: isar-users@googlegroups.com Cc: dinesh kumar(=EF=BC=B4=EF=BC=B3=EF=BC=A9=EF=BC=B0 TMIEC ODG Porting) ; kunijadar shivanand(=EF=BC=B4=EF=BC=B3=EF=BC= =A9=EF=BC=B0 TMIEC ODG Porting) Subject: ROOTFS_SIZE changes between multiple builds Hi All, I have been recently working on reproducible builds for a downstream projec= t (isar-cip-core). On that effort, I came across a behavior with the ROOTFS_SIZE variable. Som= etimes I see that when I build 2 images to check for reproducibility, the v= alue of the ROOTFS_SIZE variable changes between builds. The variation usua= lly only by a few KB's and this behavior is not seen quite often either. At= the moment I am not sure about the cause of this problem, Hence posting he= re seeking suggestions from the rest of you. I tried checking the rootfs contents, but the contents are identical despit= e the difference in the size of the rootfs directory. I am trying to understand this for the following reasons: 1. In the case where no size parameter is set for a partition in the wks f= ile, wic estimates the rootfs size from the rootfs directory in WORKDIR, Se= e [1]. When the rootfs size is different for the 2 builds, the resulting fi= lesystem images are also different (in the case that I encountered, the 2 e= xt4 filesystem images are off by a few blocks). 2. While creating an ext4 filesystem images with the IMAGE_CMD of isar, th= e filesystem images are created based the ROOTFS_SIZE. In the scenario wher= e ROOTFS_SIZE are the different, the resultant filesystem images are also n= on-reproducible. See [2] With regards to point 2 above, that maybe a different topic as there are ot= her problems in achieving reproducibility of ext4 filesystem images, like s= upport for file timestamp clamping to SOURCE_DATE_EPOCH was only recently a= dded to mkfs.ext4 (v1.47.1) Would like to understand if anyone here has come across such a scenario / a= ny pointers on how to get to the root cause? [1] https://github.com/ilbers/isar/blob/master/scripts/lib/wic/partition.py= #L242 [2] https://github.com/ilbers/isar/blob/master/meta/classes/imagetypes.bbcl= ass#L19 Thanks and Regards, Adithya Balakumar --=20 You received this message because you are subscribed to the Google Groups "= isar-users" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to isar-users+unsubscribe@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/= isar-users/TYCPR01MB966943B203E939D178024C33C4A22%40TYCPR01MB9669.jpnprd01.= prod.outlook.com. --_000_TYCPR01MB966943B203E939D178024C33C4A22TYCPR01MB9669jpnp_ Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

I tried u= nderstanding the root cause of this issue, When there is a difference in th= e ROOTFS_SIZE, I see that some of the files in the rootfs tree has differen= t number of blocks allocated to the file.

I say &qu= ot;some" files because the files/directories that are affected are not= the same in every build. For instance, I am attaching an example below whe= re the man8 directory using different number of blocks despite having the same size according to the stat command

&nbs= p;

Build1:

host:~/wo= rk/isar-cip-core$ stat build/tmp/work/cip-core-bookworm-armhf/cip-core-imag= e-bbb/1.0-r0/rootfs/usr/share/man/man8

  Fi= le: build3/tmp/work/cip-core-bookworm-armhf/cip-core-image-bbb/1.0-r0/rootf= s/usr/share/man/man8

  Si= ze: 24576           Block= s: 56         IO Block: 4096 &= nbsp; directory

Device: 8= 02h/2050d      Inode: 26428993    L= inks: 2

Access: (= 0755/drwxr-xr-x)  Uid: (    0/    root)&= nbsp;  Gid: (    0/    root)<= /span>

Access: 2= 024-07-15 15:29:02.560481148 +0530

Modify: 2= 024-06-24 11:13:41.000000000 +0530

Change: 2= 024-07-15 15:29:01.376474194 +0530

Birth: -<= o:p>

&nbs= p;

Build2:

host:~/wo= rk/isar-cip-core$ stat build2/tmp/work/cip-core-bookworm-armhf/cip-core-ima= ge-bbb/1.0-r0/rootfs/usr/share/man/man8

  Fi= le: build4/tmp/work/cip-core-bookworm-armhf/cip-core-image-bbb/1.0-r0/rootf= s/usr/share/man/man8

  Si= ze: 24576           Block= s: 48         IO Block: 4096 &= nbsp; directory

Device: 8= 02h/2050d      Inode: 26027389    L= inks: 2

Access: (= 0755/drwxr-xr-x)  Uid: (    0/    root)&= nbsp;  Gid: (    0/    root)<= /span>

Access: 2= 024-07-15 15:55:17.458599845 +0530

Modify: 2= 024-06-24 11:13:41.000000000 +0530

Change: 2= 024-07-15 15:55:16.270589701 +0530

Birth: -<= o:p>

&nbs= p;

Using the= "du" command to measure the size of the rootfs directory in such= a case, yields different values for the ROOTFS_SIZE.

I noticed= that, openembedded core uses a custom function to measure the directory si= ze, See [1] and [2]. Using the same function in isar seems to soves this pr= oblem based on  my tests. Any thoughts?

&nbs= p;

[1] https://github.com/openembedded/openembedded-core/blob/master/meta/classes-= recipe/image.bbclass#L559

[2] https://github.com/openembedded/openembedded-core/blob/master/meta/lib/oe/u= tils.py#L502

&nbs= p;

From:= balakumar adithya(=EF=BC=B4=EF=BC=B3=EF=BC=A9=EF= =BC=B0 TEUR)
Sent: Thursday, July 4, 2024 8:01 PM
To: isar-users@googlegroups.com
Cc: dinesh kumar(=EF=BC=B4=EF=BC=B3=EF=BC= =A9=EF=BC=B0 TMIEC ODG Porting) <dinesh.kumar@toshiba-tsip.com= >; kunijadar shivanand(=EF=BC=B4=EF=BC=B3=EF=BC= =A9=EF=BC=B0 TMIEC ODG Porting) <Shivanand.Kunijadar@toshiba-tsip.com>
Subject: ROOTFS_SIZE changes between multiple builds

 

Hi All,

I have been recently working on reproducible = builds for a downstream project (isar-cip-core).

On that effort, I came across a behavior with= the ROOTFS_SIZE variable. Sometimes I see that when I build 2 images to ch= eck for reproducibility, the value of the ROOTFS_SIZE variable changes betw= een builds. The variation usually only by a few KB's and this behavior is not seen quite often either. At th= e moment I am not sure about the cause of this problem, Hence posting here = seeking suggestions from the rest of you.

I tried checking the rootfs contents, but the= contents are identical despite the difference in the size of the rootfs di= rectory.

I am trying to understand this for the follow= ing reasons:
1.  In the case where no size parameter is set for a partition in the = wks file, wic estimates the rootfs size from the rootfs directory in WORKDI= R, See [1]. When the rootfs size is different for the 2 builds, the resulti= ng filesystem images are also different (in the case that I encountered, the 2 ext4 filesystem images are off by a= few blocks).
2.  While creating an ext4 filesystem images with the IMAGE_CMD of isa= r, the filesystem images are created based the ROOTFS_SIZE. In the scenario= where ROOTFS_SIZE are the different, the resultant filesystem images are a= lso non-reproducible. See [2]

With regards to point 2 above, that maybe a d= ifferent topic as there are other problems in achieving reproducibility of = ext4 filesystem images, like support for file timestamp clamping to SOURCE_= DATE_EPOCH was only recently added to mkfs.ext4 (v1.47.1)

Would like to understand if anyone here has c= ome across such a scenario / any pointers on how to get to the root cause?<= o:p>


[1] https://github.com/ilbers/isar/blob/master/scripts/lib/wic/partition.py#L24= 2
[2] https://github.com/ilbers/isar/blob/master/meta/classes/imagetypes.bbclass#= L19

Thanks and Regards,<= /o:p>

Adithya Balakumar

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