Re: [pve-devel] [PATCH installer 3/3] low-level: install: check for already-existing `rpool` on install

[Aaron Lauterer <a.lauterer@proxmox.com>]

On  2024-05-16  12:28, Christoph Heiss wrote:
> .. in the same manner as the detection for LVM works.
> 
> zpools can only be renamed by importing them with a new name, so
> unfortunaly the import-export dance is needed.
> 
> Signed-off-by: Christoph Heiss <c.heiss@proxmox.com>
> ---
>   Proxmox/Install.pm | 33 +++++++++++++++++++++++++++++++++
>   1 file changed, 33 insertions(+)
> 
> diff --git a/Proxmox/Install.pm b/Proxmox/Install.pm
> index c86a574..531ef1c 100644
> --- a/Proxmox/Install.pm
> +++ b/Proxmox/Install.pm
> @@ -16,6 +16,7 @@ use Proxmox::Install::StorageConfig;
>   use Proxmox::Sys::Block qw(get_cached_disks wipe_disk partition_bootable_disk);
>   use Proxmox::Sys::Command qw(run_command syscmd);
>   use Proxmox::Sys::File qw(file_read_firstline file_write_all);
> +use Proxmox::Sys::ZFS;
>   use Proxmox::UI;
>   
>   # TODO: move somewhere better?
> @@ -176,9 +177,41 @@ sub random_short_uid {
>       return sprintf "%08X", rand(0xffffffff);
>   }
>   
> +sub zfs_ask_existing_zpool_rename {
> +    my ($pool_name) = @_;
> +
> +    # At this point, no pools should be imported/active
> +    my $exported_pools = Proxmox::Sys::ZFS::get_exported_pools();
> +
> +    foreach (@$exported_pools) {
> +	next if $_->{name} ne $pool_name || $_->{state} ne 'ONLINE';
> +	my $renamed_pool = "$_->{name}-OLD-" . random_short_uid();

since the pool already has a unigue numerical id, couln't we use that 
instead of generating a new one?

we even have everything in place with $_->{id}.

> +
> +	my $response_ok = Proxmox::UI::prompt(
> +	    "A ZFS pool named '$_->{name}' (id $_->{id}) already exists on the system.\n\n" .
> +	    "Do you want to rename the pool to '$renamed_pool' before continuing\n" .
> +	    "or cancel the installation?"
> +	);
> +
> +	# Import the pool using its id, as that is unique and works even if there are
> +	# multiple zpools with the same name.
> +	if ($response_ok) {
> +	    syscmd("zpool import -f $_->{id} $renamed_pool") == 0 ||
> +		die "failed to import zfs pool '$_->{name}' with new name '$renamed_pool'\n";
> +	    syscmd("zpool export $renamed_pool") == 0 ||
> +		warn "failed to export renamed zfs pool '$renamed_pool'\n";
> +	} else {
> +	    warn "Canceled installation as requested by user, due to already existing ZFS pool '$pool_name'\n";
> +	    die "\n"; # causes abort without re-showing an error dialogue
> +	}
> +    }
> +}
> +
>   sub zfs_create_rpool {
>       my ($vdev, $pool_name, $root_volume_name) = @_;
>   
> +    zfs_ask_existing_zpool_rename($pool_name);
> +
>       my $iso_env = Proxmox::Install::ISOEnv::get();
>   
>       my $zfs_opts = Proxmox::Install::Config::get_zfs_opt();


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