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Bug 1254537 - [RFE] support for cpio --reproducible
[RFE] support for cpio --reproducible
Product: Fedora
Classification: Fedora
Component: cpio (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Pavel Raiskup
Fedora Extras Quality Assurance
Depends On:
Blocks: 1386662
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Reported: 2015-08-18 06:53 EDT by Giuseppe Scrivano
Modified: 2016-10-19 08:06 EDT (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 1386662 (view as bug list)
Last Closed: 2015-09-14 08:03:50 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Giuseppe Scrivano 2015-08-18 06:53:33 EDT
Description of problem:

The OSTree system uses content-addressed storage, and when initramfs images generated by dracut are in the tree, because the cpio format contains modification and it causes a different checksum every time
it's created, so causing the download of the initrd even if not changed from last time.

Dracut has already support for --reproducible and it is used whenever it is supported by cpio.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. cpio --help | grep reproducible

Actual results:

no support for --reproducible

Expected results:

--reproducible is supported

Additional info:

The backport of the upstream patch:

commit 3945f9db44c935608caa5f084fd7f67ae59ee9e1
Author: Sergey Poznyakoff <>
Date:   Mon Dec 1 15:02:38 2014 +0200

    New options to create device and inode-independent archives.
    * src/util.c (inode_val): New member trans_inode
    (find_inode_val): New function.
    (find_inode_file): Rewrite using the above.
    (add_inode): Initialize the trans_inode member
    depending on the value of renumber_inodes_option.
    (get_inode_and_dev): New function.
    (stat_to_cpio): Use get_inode_and_dev.
    (arf_stores_inode_p): New function.
    * src/extern.h (renumber_inodes_option)
    (ignore_devno_option): New externs.
    * src/global.c (renumber_inodes_option)
    (ignore_devno_option): New variables.
    * src/main.c: Add new options.
    * NEWS: Document changes.
    * doc/cpio.1: Document new options.
    * doc/cpio.texi: Likewise.

is required
Comment 1 Ondrej Vasik 2015-08-18 09:35:04 EDT
It is 5 years since the cpio-2.11 was released. I think it would be better to ask upstream to release cpio-2.12 - this might be good excuse for it. Backport is of course doable (although almost all hunks fail when applying directly) - but there are more useful commits in cpio upstream in the last 5 years (and we backported just a few).

Pavel, will you ask Sergey there?
Comment 2 Giuseppe Scrivano 2015-08-20 05:35:50 EDT
Good idea.

I have sent some patches to (still didn't appear in the archives)  to get the latest version built on Fedora 22 and get "make check" to pass.
Comment 3 Giuseppe Scrivano 2015-08-26 09:37:25 EDT
now they are on the archives:
Comment 4 Giuseppe Scrivano 2015-09-13 06:24:29 EDT
cpio 2.12 that was released on the 12th of September contains --reproducible:

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