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nixos-container --create: Add option --system-path

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This allows creating a container from an existing system store path,
which is especially nice for NixOps-deployed hosts because they don't
need a Nixpkgs tree anymore.
This commit is contained in:
Eelco Dolstra 2014-08-19 15:47:51 +02:00
parent f932910323
commit ddd8f0cf66
1 changed files with 18 additions and 10 deletions
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20
nixos/modules/virtualisation/nixos-container.pl
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@ -17,7 +17,7 @@ umask 0022;
sub showHelp {
print <<EOF;
Usage: nixos-container list
nixos-container create <container-name> [--config <string>] [--ensure-unique-name] [--auto-start]
nixos-container create <container-name> [--system-path <path>] [--config <string>] [--ensure-unique-name] [--auto-start]
nixos-container destroy <container-name>
nixos-container start <container-name>
nixos-container stop <container-name>
@ -31,6 +31,7 @@ EOF
exit 0;
}
my $systemPath;
my $ensureUniqueName = 0;
my $autoStart = 0;
my $extraConfig;
@ -39,6 +40,7 @@ GetOptions(
"help" => sub { showHelp() },
"ensure-unique-name" => \$ensureUniqueName,
"auto-start" => \$autoStart,
"system-path=s" => \$systemPath,
"config=s" => \$extraConfig
) or exit 1;
@ -132,11 +134,6 @@ if ($action eq "create") {
print STDERR "host IP is $hostAddress, container IP is $localAddress\n";
mkpath("$root/etc/nixos", 0, 0755);
my $nixosConfigFile = "$root/etc/nixos/configuration.nix";
writeNixOSConfig $nixosConfigFile;
# The per-container directory is restricted to prevent users on
# the host from messing with guest users who happen to have the
# same uid.
@ -145,10 +142,21 @@ if ($action eq "create") {
$profileDir = "$profileDir/$containerName";
mkpath($profileDir, 0, 0755);
# Build/set the initial configuration.
if (defined $systemPath) {
system("nix-env", "-p", "$profileDir/system", "--set", $systemPath) == 0
or die "$0: failed to set initial container configuration\n";
} else {
mkpath("$root/etc/nixos", 0, 0755);
my $nixosConfigFile = "$root/etc/nixos/configuration.nix";
writeNixOSConfig $nixosConfigFile;
system("nix-env", "-p", "$profileDir/system",
"-I", "nixos-config=$nixosConfigFile", "-f", "<nixpkgs/nixos>",
"--set", "-A", "system") == 0
or die "$0: failed to build initial container configuration\n";
}
print "$containerName\n" if $ensureUniqueName;
exit 0;