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From 8a3bf53398f312b46ed4f304df4c66d061e612c7 Mon Sep 17 00:00:00 2001
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From: Eduardo Otubo <otubo@redhat.com>
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Date: Thu, 28 Feb 2019 12:38:36 +0100
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Subject: cloud-init-per: don't use dashes in sem names
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RH-Author: Eduardo Otubo <otubo@redhat.com>
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Message-id: <20190228123836.17979-1-otubo@redhat.com>
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Patchwork-id: 84743
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O-Subject: [RHEL-7.7 cloud-init PATCH] This is to fix https://bugs.launchpad.net/cloud-init/+bug/1812676
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Bugzilla: 1664876
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RH-Acked-by: Mohammed Gamal <mgamal@redhat.com>
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RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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From: Vitaly Kuznetsov <vkuznets@redhat.com>
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It was found that when there is a dash in cloud-init-per command
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name and cloud-init-per is executed through cloud-init's bootcmd, e.g:
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bootcmd:
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- cloud-init-per instance mycmd-bootcmd /usr/bin/mycmd
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the command is executed on each boot. However, running the same
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cloud-init-per command manually after boot doesn't reveal the issue. Turns
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out the issue comes from 'migrator' cloud-init module which renames all
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files in /var/lib/cloud/instance/sem/ replacing dashes with underscores. As
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migrator runs before bootcmd it renames
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/var/lib/cloud/instance/sem/bootper.mycmd-bootcmd.instance
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to
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/var/lib/cloud/instance/sem/bootper.mycmd_bootcmd.instance
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so cloud-init-per doesn't see it and thinks that the comment was never ran
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before. On next boot the sequence repeats.
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There are multiple ways to resolve the issue. This patch takes the
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following approach: 'canonicalize' sem names by replacing dashes with
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underscores (this is consistent with post-'migrator' contents of
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/var/lib/cloud/instance/sem/). We, however, need to be careful: in case
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someone had a command with dashes before and he had migrator module enables
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we need to see the old sem file (or the command will run again and this can
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be as bad as formatting a partition!) so we add a small 'migrator' part to
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cloud-init-per script itself checking for legacy sem names.
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Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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commit 9cf9d8cdd3a8fd7d4d425f7051122d0ac8af2bbd
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Author: Vitaly Kuznetsov <vkuznets@redhat.com>
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Date: Mon Feb 18 22:55:49 2019 +0000
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This is to fix https://bugs.launchpad.net/cloud-init/+bug/1812676
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Resolves: rhbz#1664876
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X-downstream-only: false
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Signed-off-by: Eduardo Otubo <otubo@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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tools/cloud-init-per | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/tools/cloud-init-per b/tools/cloud-init-per
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index 7d6754b6..eae3e93f 100755
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--- a/tools/cloud-init-per
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+++ b/tools/cloud-init-per
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@@ -38,7 +38,7 @@ fi
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[ "$1" = "-h" -o "$1" = "--help" ] && { Usage ; exit 0; }
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[ $# -ge 3 ] || { Usage 1>&2; exit 1; }
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freq=$1
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-name=$2
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+name=${2/-/_}
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shift 2;
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[ "${name#*/}" = "${name}" ] || fail "name cannot contain a /"
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@@ -53,6 +53,12 @@ esac
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[ -d "${sem%/*}" ] || mkdir -p "${sem%/*}" ||
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fail "failed to make directory for ${sem}"
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+# Rename legacy sem files with dashes in their names. Do not overwrite existing
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+# sem files to prevent clobbering those which may have been created from calls
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+# outside of cloud-init.
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+sem_legacy="${sem/_/-}"
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+[ "$sem" != "$sem_legacy" -a -e "$sem_legacy" ] && mv -n "$sem_legacy" "$sem"
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+
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[ "$freq" != "always" -a -e "$sem" ] && exit 0
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"$@"
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ret=$?
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--
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2.20.1
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