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Date: Mon, 12 Sep 2022 11:13:31 +0200
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To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>,
Leo Nunner <l.nunner@proxmox.com>
References: <20220909114539.61612-1-l.nunner@proxmox.com>
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Subject: Re: [pve-devel] [PATCH container] fix #4192: add new
architecture-dependent path to check for newer versions of systemd
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Looks ok semantically, some comments for mostly code style issues inline
On 09/09/2022 13:45, Leo Nunner wrote:
> Signed-off-by: Leo Nunner <l.nunner@proxmox.com>
> ---
> In newer versions, libsystemd-shared-*.so is placed in an
> architecture-specific folder (e.g. /usr/lib/x86_64-linux-gnu/systemd/).
> I adapted the code to include the current architecture while searching, as
> well as allowing for the addition of further paths, should it change again
> in the future.
why is above outside the commit message's body as mail comment? This is good
and important info for the patch to have tracked in git.
>
> src/PVE/LXC/Setup.pm | 2 +-
> src/PVE/LXC/Setup/Alpine.pm | 2 +-
> src/PVE/LXC/Setup/Base.pm | 33 +++++++++++++++++++++++++--------
> src/PVE/LXC/Setup/Devuan.pm | 2 +-
> src/PVE/LXC/Setup/Plugin.pm | 2 +-
> src/PVE/LXC/Setup/Unmanaged.pm | 2 +-
> 6 files changed, 30 insertions(+), 13 deletions(-)
>
> diff --git a/src/PVE/LXC/Setup.pm b/src/PVE/LXC/Setup.pm
> index b72a18e..6446094 100644
> --- a/src/PVE/LXC/Setup.pm
> +++ b/src/PVE/LXC/Setup.pm
> @@ -285,7 +285,7 @@ sub post_create_hook {
> sub unified_cgroupv2_support {
> my ($self) = @_;
>
> - return $self->protected_call(sub { $self->{plugin}->unified_cgroupv2_support() });
> + return $self->protected_call(sub { $self->{plugin}->unified_cgroupv2_support($self->{conf}) });
> }
>
> # os-release(5):
> diff --git a/src/PVE/LXC/Setup/Alpine.pm b/src/PVE/LXC/Setup/Alpine.pm
> index b56d895..5d22e69 100644
> --- a/src/PVE/LXC/Setup/Alpine.pm
> +++ b/src/PVE/LXC/Setup/Alpine.pm
> @@ -102,7 +102,7 @@ sub setup_network {
>
> # non systemd based containers work with pure cgroupv2
> sub unified_cgroupv2_support {
> - my ($self) = @_;
> + my ($self, $conf) = @_;
why pass the whole config if you just need the arch? Please avoid overly generic
parameter in signatures if only one specific thing is required.
>
> return 1;
> }
> diff --git a/src/PVE/LXC/Setup/Base.pm b/src/PVE/LXC/Setup/Base.pm
> index cc12914..f58edf8 100644
> --- a/src/PVE/LXC/Setup/Base.pm
> +++ b/src/PVE/LXC/Setup/Base.pm
> @@ -517,20 +517,36 @@ sub clear_machine_id {
> # tries to guess the systemd (major) version based on the existence of
> # (/usr)?/lib/systemd/libsystemd-shared<version>.so. It was introduced in v231.
> sub get_systemd_version {
> - my ($self) = @_;
> + my ($self, $conf) = @_;
>
> - my $sd_lib_dir = $self->ct_is_directory("/lib/systemd") ?
> - "/lib/systemd" : "/usr/lib/systemd";
> - my $libsd = PVE::Tools::dir_glob_regex($sd_lib_dir, "libsystemd-shared-.+\.so");
> - if (defined($libsd) && $libsd =~ /libsystemd-shared-(\d+)(?:\..*)?\.so/) {
> - return $1;
> + my $current_arch = $conf->{arch};
> + my %arch_full_names = (
> + "amd64" => "x86_64",
> + "i386" => "i386",
> + "arm64" => "aarch64",
> + "armhf" => "arm"
> + );
rather unrelated to the method, I'd factor it out in its own private sub
my sub arch_to_full_name {
my ($arch) = @_;
...
}
and please also handle the case where arch isn't known, e.g., by explicitly
dying, to avoid gettin a less visible "undef in string concat" warning.
> +
> + my @search_dirs = (
> + "/lib/systemd",
> + "/usr/lib/systemd",
> + "/usr/lib/" . $arch_full_names{$current_arch} . "-linux-gnu/systemd/"
In perl you can do string concatenation of variables inside double quotes, albeit
it's a bit ugly for hash accesses, but with abofrementioned factoring out of the
arch -> full name resolution it would be a simple scalar variable here anyway:
"/usr/lib/${arch_full_name}-linux-gnu/systemd/"
At some point it may get easier to just parse `ldd /sbin/init` though ^^
> + );
> +
> + foreach my $sd_lib_dir ( @search_dirs ) {
> + next if !$self->ct_is_directory($sd_lib_dir);
> +
> + my $libsd = PVE::Tools::dir_glob_regex($sd_lib_dir, "libsystemd-shared-.+\.so");
> + if (defined($libsd) && $libsd =~ /libsystemd-shared-(\d+)(?:\..*)?\.so/) {
> + return $1;
> + }
> }
>
> return undef;
> }