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