[pve-devel] [PATCH ifupdown2 1/1] fix #5197: do not run scripts ending with .dpkg-{old, new, tmp, dist}

[Fabian Grünbichler]

small nit below, otherwise

Reviewed-by: Fabian Grünbichler <f.gruenbichler at proxmox.com>

On June 27, 2024 5:01 pm, Stefan Hanreich wrote:
> This can lead to issue when upgrading from ifupdown to ifupdown2. The
> particular issue this fixes occurs in the following scenario:
> 
> * Suppose there is a legacy Debian host with ifupdown and ifenslave
>   installed that has a bond configured in /etc/network/interfaces.
> * ifenslave installs a script /etc/network/if-pre-up.d/ifenslave.
> * Now, an upgrade creates a second script
>   /etc/network/if-pre-up.d/ifenslave.dpkg-new. As ifupdown executes
>   network scripts via run-parts which ignores scripts with . in their
>   name, ifenslave.dpkg-new has no effect.
> * If the host switches over to ifupdown2 by installing it (removing
>   ifupdown, keeping ifenslave) and reboots, the network will not come
>   up:
>   /etc/network/if-pre-up.d/ifenslave still exists, but is ignored
>   by ifupdown2's bond addon [1]
>   /etc/network/if-pre-up.d/ifenslave.dpkg-new is executed by ifupdown2
>   because it executes all scripts in /etc/network/if-pre-up.d, even if
>   their name contains a dot
> 
> This leads to ifreload failing on upgrades, which in turn causes
> issues with the networking of upgraded hosts.
> 
> Also submitted upstream at [2]
> 
> [1] https://github.com/CumulusNetworks/ifupdown2/blob/ccdc386cfab70703b657fe7c0ffceb95448a9c2b/ifupdown2/addons/bond.py#L45
> [2] https://github.com/CumulusNetworks/ifupdown2/pull/304
> 
> Signed-off-by: Stefan Hanreich <s.hanreich at proxmox.com>
> ---
>  ...dpkg-files-when-running-hook-scripts.patch | 54 +++++++++++++++++++
>  debian/patches/series                         |  1 +
>  2 files changed, 55 insertions(+)
>  create mode 100644 debian/patches/pve/0010-main-ignore-dpkg-files-when-running-hook-scripts.patch
> 
> diff --git a/debian/patches/pve/0010-main-ignore-dpkg-files-when-running-hook-scripts.patch b/debian/patches/pve/0010-main-ignore-dpkg-files-when-running-hook-scripts.patch
> new file mode 100644
> index 0000000..eea615f
> --- /dev/null
> +++ b/debian/patches/pve/0010-main-ignore-dpkg-files-when-running-hook-scripts.patch
> @@ -0,0 +1,54 @@
> +From dbb759a1383cf736a0fa769c5c5827e1e7f8145c Mon Sep 17 00:00:00 2001
> +From: Stefan Hanreich <s.hanreich at proxmox.com>
> +Date: Tue, 4 Jun 2024 16:17:54 +0200
> +Subject: [PATCH] main: ignore dpkg files when running hook scripts
> +
> +Currently ifupdown2 executes scripts that are backed up by dpkg (e.g.
> +foo.dpkg-old). This can lead to issues with hook scripts getting
> +executed after upgrading ifupdown2 via dpkg, even though they should
> +not be executed.
> +
> +This also brings ifupdown2 closer on par with the behavior of
> +ifupdown, which did not execute hook scripts with dpkg suffixes.

some nits for phrasing here:

- this not only affects ifupdown2 upgrades - any package shipping an
  ifupdown hook script can potentially trigger this
- the 'via dpkg' is redundant IMHO (package updates always happen via
  apt and dpkg ;))
- 'closer on par' is a bit of an oxymoron, I'd just say 'closer to' and
  maybe add that ifupdown used/uses run-parts, and doesn't execute
  dpkg-created copies of scripts for that reason

> +
> +Signed-off-by: Stefan Hanreich <s.hanreich at proxmox.com>
> +---
> + ifupdown2/ifupdown/ifupdownmain.py | 4 +++-
> + ifupdown2/ifupdown/utils.py        | 6 ++++++
> + 2 files changed, 9 insertions(+), 1 deletion(-)
> +
> +diff --git a/ifupdown2/ifupdown/ifupdownmain.py b/ifupdown2/ifupdown/ifupdownmain.py
> +index 51f5460..e6622f0 100644
> +--- a/ifupdown2/ifupdown/ifupdownmain.py
> ++++ b/ifupdown2/ifupdown/ifupdownmain.py
> +@@ -1540,7 +1540,9 @@ class ifupdownMain:
> +             try:
> +                 module_list = os.listdir(msubdir)
> +                 for module in module_list:
> +-                    if self.modules.get(module) or module in self.overridden_ifupdown_scripts:
> ++                    if (self.modules.get(module)
> ++                        or module in self.overridden_ifupdown_scripts
> ++                        or utils.is_dpkg_file(module)):
> +                         continue
> +                     self.script_ops[op].append(msubdir + '/' + module)
> +             except Exception:
> +diff --git a/ifupdown2/ifupdown/utils.py b/ifupdown2/ifupdown/utils.py
> +index 05c7e48..3085e82 100644
> +--- a/ifupdown2/ifupdown/utils.py
> ++++ b/ifupdown2/ifupdown/utils.py
> +@@ -212,6 +212,12 @@ class utils():
> +         # what we have in the cache (data retrieved via a netlink dump by
> +         # nlmanager). nlmanager return all macs in lower-case
> + 
> ++    _dpkg_suffixes = (".dpkg-old", ".dpkg-dist", ".dpkg-new", ".dpkg-tmp")
> ++
> ++    @staticmethod
> ++    def is_dpkg_file(name):
> ++        return any(name.endswith(suffix) for suffix in utils._dpkg_suffixes)
> ++
> +     @classmethod
> +     def importName(cls, modulename, name):
> +         """ Import a named object """
> +-- 
> +2.39.2
> +
> diff --git a/debian/patches/series b/debian/patches/series
> index 557aa7f..d5772c9 100644
> --- a/debian/patches/series
> +++ b/debian/patches/series
> @@ -7,6 +7,7 @@ pve/0006-openvswitch-ovs-ports-condone-regex-exclude-tap-veth.patch
>  pve/0007-allow-vlan-tag-inside-vxlan-tunnel.patch
>  pve/0008-lacp-bond-remove-bond-min-links-0-warning.patch
>  pve/0009-gvgeb-fix-python-interpreter-shebang.patch
> +pve/0010-main-ignore-dpkg-files-when-running-hook-scripts.patch
>  upstream/0001-add-ipv6-slaac-support-inet6-auto-accept_ra.patch
>  upstream/0001-addons-ethtool-add-rx-vlan-filter.patch
>  upstream/0001-scheduler-import-traceback.patch
> -- 
> 2.39.2
> 
> 
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