Attachment 1473980 Details for Bug 1613065 – Proposed changeset to be included downstream (RHEL) v2

[patch] Proposed changeset to be included downstream (RHEL) v2

0001-kernel-headers-checksum-first-commit.patch (text/plain), 2.57 KB, created by Rafael Aquini on 2018-08-07 13:08:28 UTC

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Creator: Rafael Aquini

Created: 2018-08-07 13:08:28 UTC

Size: 2.57 KB

patch

obsolete

>From 55c15142cf7df618ee292a4de14403f89423aedc Mon Sep 17 00:00:00 2001
>From: Aristeu Rozanski <arozansk@redhat.com>
>Date: Fri, 3 Aug 2018 09:43:40 -0400
>Subject: [PATCH v2] kernel-headers checksum: first commit
>
>These files on redhat-rpm-config will add
>	Provides: kernel-headers-checksum = <sha>
>which is a checksum of all kernel-headers contents except for
>/usr/include/linux/version.h which changes each release.
>
>The idea is to avoid container image builders to rebuild the entire
>image because kernel-headers changed version. Because kernel-headers is
>a subpackage of the kernel package and its contents come from the kernel
>source tree, every new kernel built will also include a new
>kernel-headers package while hardly any of kernel-headers content will
>change. These files allow to scripts to quickly determine if there're
>content changes between two RPMs excluding version.h which does get
>updated for every release.
>
>Signed-off-by: Aristeu Rozanski <arozansk@redhat.com>
>---
>v2: apparently find does not guarantee the headers list order
>    accross different hosts, so we deliberately sort it out
>    before hashing files content to be as deterministic as possible.
>
> fileattrs/kheaders.attr    |  2 ++
> kernel-headers-checksum.sh | 20 ++++++++++++++++++++
> 2 files changed, 22 insertions(+)
> create mode 100644 fileattrs/kheaders.attr
> create mode 100755 kernel-headers-checksum.sh
>
>diff --git a/fileattrs/kheaders.attr b/fileattrs/kheaders.attr
>new file mode 100644
>index 0000000..a85ae8e
>--- /dev/null
>+++ b/fileattrs/kheaders.attr
>@@ -0,0 +1,2 @@
>+%__kheaders_provides	%{_rpmconfigdir}/kernel-headers-checksum.sh %{buildroot}
>+%__kheaders_path	^/usr/include/linux/version.h$
>diff --git a/kernel-headers-checksum.sh b/kernel-headers-checksum.sh
>new file mode 100755
>index 0000000..d589696
>--- /dev/null
>+++ b/kernel-headers-checksum.sh
>@@ -0,0 +1,20 @@
>+#!/bin/sh +x
>+#
>+# kernel-headers-checksum.sh - Generate a checksum of the important kernel-headers files
>+#			       to help container scripts to determine when an image needs
>+#			       to be rebuilt due kernel-headers release change.
>+#
>+# $1: buildroot
>+
>+checksum=$(awk '/KERNEL_HEADERS_CHECKSUM/ {print $3}' \
>+		$1/usr/include/linux/version.h | sed -s 's|\"||g');
>+
>+# if version.h doesn't export a precalculated checksum, we calculate it here
>+# we don't care about version.h, so exclude it from the checksum
>+if [ -z "$checksum" ]; then
>+    checksum=$(find $1/usr/include -type f -name "*.h" \
>+			! -path $1/usr/include/linux/version.h | \
>+		sort | xargs cat | sha1sum - | cut -f 1 -d ' ');
>+fi
>+
>+echo "kernel-headers-checksum = $checksum";
>-- 
>2.17.1
>

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Attachments on bug 1613065: 1473980 | 1474007