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From abbfdf2aa3e17a84d0f4075f125e670defaf7296 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Marcus=20Sch=C3=A4fer?= <marcus.schaefer@gmail.com>
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Date: Wed, 16 Nov 2022 00:17:19 +0100
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Subject: [PATCH] Fix reading /etc/machine-id in kernel-install (#25388)
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* Fix reading /etc/machine-id in kernel-install
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The kernel-install script has code to read the contents of
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/etc/machine-id into the MACHINE_ID variable. Depending
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on the variable content kernel-install either logs the
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value or creates a new machine id via 'systemd-id128 new'.
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In that logic there is one issue. If the file /etc/machine-id
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exists but is empty, the script tries to call read on an
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empty file which return with an exit code != 0. As the
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script code also uses 'set -e', kernel-install will exit at
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this point which is unexpected.
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The condition of an empty /etc/machine-id file exists for
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example when building OS images, which should initialize the
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system id on first boot but not staticly inside of the image.
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afaik an empty /etc/machine-id is also a common approach
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to make systemd indicate that it should create a new system
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id. Because of this, the commit makes sure the reading of
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/etc/machine-id does not fail in any case such that the
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handling of the MACHINE_ID variable takes place.
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(cherry picked from commit 883e7cbfc0dba6c81338e7924419b5cbb0cba0b2)
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Related: #2138081
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---
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src/kernel-install/kernel-install.in | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/kernel-install/kernel-install.in b/src/kernel-install/kernel-install.in
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index 22eb4d2be1..bba22f8a20 100755
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--- a/src/kernel-install/kernel-install.in
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+++ b/src/kernel-install/kernel-install.in
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@@ -158,7 +158,7 @@ if [ -z "$MACHINE_ID" ] && [ -f /etc/machine-info ]; then
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[ -n "$MACHINE_ID" ] && \
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log_verbose "machine-id $MACHINE_ID acquired from /etc/machine-info"
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fi
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-if [ -z "$MACHINE_ID" ] && [ -f /etc/machine-id ]; then
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+if [ -z "$MACHINE_ID" ] && [ -s /etc/machine-id ]; then
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read -r MACHINE_ID
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[ -n "$MACHINE_ID" ] && \
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log_verbose "machine-id $MACHINE_ID acquired from /etc/machine-id"
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