Merge pull request #75 from nix-community/zap2

zap only devices we care about

default.nix

@@ -17,7 +17,7 @@ in {
   create = cfg: types.diskoLib.create (eval cfg).config.devices;
   createScript = cfg: pkgs: pkgs.writeScript "disko-create" ''
     #!/usr/bin/env bash
-    export PATH=${lib.makeBinPath (types.diskoLib.packages (eval cfg).config.devices pkgs)}
+    export PATH=${lib.makeBinPath (types.diskoLib.packages (eval cfg).config.devices pkgs)}:$PATH
     ${types.diskoLib.create (eval cfg).config.devices}
   '';
   createScriptNoDeps = cfg: pkgs: pkgs.writeScript "disko-create" ''
@@ -27,7 +27,7 @@ in {
   mount = cfg: types.diskoLib.mount (eval cfg).config.devices;
   mountScript = cfg: pkgs: pkgs.writeScript "disko-mount" ''
     #!/usr/bin/env bash
-    export PATH=${lib.makeBinPath (types.diskoLib.packages (eval cfg).config.devices pkgs)}
+    export PATH=${lib.makeBinPath (types.diskoLib.packages (eval cfg).config.devices pkgs)}:$PATH
     ${types.diskoLib.mount (eval cfg).config.devices}
   '';
   mountScriptNoDeps = cfg: pkgs: pkgs.writeScript "disko-mount" ''
@@ -37,7 +37,7 @@ in {
   zapCreateMount = cfg: types.diskoLib.zapCreateMount (eval cfg).config.devices;
   zapCreateMountScript = cfg: pkgs: pkgs.writeScript "disko-zap-create-mount" ''
     #!/usr/bin/env bash
-    export PATH=${lib.makeBinPath (types.diskoLib.packages (eval cfg).config.devices pkgs)}
+    export PATH=${lib.makeBinPath (types.diskoLib.packages (eval cfg).config.devices pkgs)}:$PATH
     ${types.diskoLib.zapCreateMount (eval cfg).config.devices}
   '';
   zapCreateMountScriptNoDeps = cfg: pkgs: pkgs.writeScript "disko-zap-create-mount" ''

disk-deactivate/disk-deactivate

@@ -0,0 +1,6 @@
+#!/bin/sh
+set -efux
+# dependencies: jq util-linux lvm2 mdadm zfs
+disk=$1
+
+lsblk --output-all --json | jq -r --arg disk_to_clear "$disk" -f "$(dirname $0)/disk-deactivate.jq"

disk-deactivate/disk-deactivate.jq

@@ -0,0 +1,77 @@
+# since lsblk lacks zfs support, we have to do it this way
+def remove:
+  if .fstype == "zfs_member" then
+    "zpool destroy -f \(.label)"
+  elif .fstype == "LVM2_member" then
+    [
+      "vg=$(pvs \(.path) --noheadings --options vg_name | grep -o '[a-zA-Z0-9-]*')",
+      "vgchange -a n \"$vg\"",
+      "vgremove -f \"$vg\""
+    ]
+  elif .fstype == "swap" then
+    "swapoff \(.path)"
+  elif .fstype == null then
+    # maybe its zfs
+    [
+      # the next line has some horrible escaping
+      "zpool=$(zdb -l \(.path) | sed -nr $'s/ +name: \\'(.*)\\'/\\\\1/p')",
+      "if [[ -n \"${zpool}\" ]]; then zpool destroy -f \"$zpool\"; fi",
+      "unset zpool"
+    ]
+  else
+    []
+  end
+;
+
+def deactivate:
+  if .type == "disk" then
+    [
+      "wipefs --all -f \(.path)"
+    ]
+  elif .type == "part" then
+    [
+      "wipefs --all -f \(.path)"
+    ]
+  elif .type == "crypt" then
+    [
+      "cryptsetup luksClose \(.path)",
+      "wipefs --all -f \(.path)"
+    ]
+  elif .type == "lvm" then
+    (.name | split("-")[0]) as $vgname |
+    (.name | split("-")[1]) as $lvname |
+    [
+      "lvremove -fy \($vgname)/\($lvname)"
+    ]
+  elif .type == "raid1" then
+    [
+      "mdadm --stop \(.name)"
+    ]
+  else
+    []
+  end
+;
+
+def walk:
+  [
+    (.mountpoints[] | "umount -R \(.)"),
+    ((.children // []) | map(walk)),
+    remove,
+    deactivate
+  ]
+;
+
+def init:
+  "/dev/\(.name)" as $disk |
+  if $disk == $disk_to_clear then
+    [
+      "set -fu",
+      walk
+    ]
+  else
+    []
+  end
+;
+
+.blockdevices | map(init) | flatten | join("\n")
+

example/complex.nix

@@ -39,6 +39,9 @@
               type = "luks";
               name = "crypted1";
               keyFile = "/tmp/secret.key";
+              extraArgs = [
+                "--iter-time 1"
+              ];
               content = {
                 type = "lvm_pv";
                 vg = "pool";
@@ -64,6 +67,9 @@
               type = "luks";
               name = "crypted2";
               keyFile = "/tmp/secret.key";
+              extraArgs = [
+                "--iter-time 1"
+              ];
               content = {
                 type = "lvm_pv";
                 vg = "pool";

example/swap.nix

@@ -25,7 +25,6 @@
             start = "100MiB";
             end = "-1G";
             part-type = "primary";
-            bootable = true;
             content = {
               type = "filesystem";
               format = "ext4";
@@ -33,12 +32,11 @@
             };
           }
           {
-            name = "root";
+            name = "swap";
             type = "partition";
             start = "-1G";
             end = "100%";
             part-type = "primary";
-            bootable = true;
             content = {
               type = "swap";
               randomEncryption = true;

example/zfs-over-legacy.nix

@@ -49,7 +49,6 @@
   zpool = {
     zroot = {
       type = "zpool";
-      rootFsOptions.mountpoint = "none";
       datasets = {
         "root" = {
           zfs_type = "filesystem";
@@ -58,7 +57,6 @@
         "root/zfs_fs" = {
           zfs_type = "filesystem";
           mountpoint = "/zfs_fs";
-          options.mountpoint = "/zfs_fs";
           options."com.sun:auto-snapshot" = "true";
         };
       };

module.nix

@@ -19,17 +19,17 @@ in {
   };
   config = {
     system.build.formatScript = pkgs.writers.writeDash "disko-create" ''
-      export PATH=${lib.makeBinPath (types.diskoLib.packages cfg.devices pkgs)}
+      export PATH=${lib.makeBinPath (types.diskoLib.packages cfg.devices pkgs)}:$PATH
       ${types.diskoLib.create cfg.devices}
     '';
 
     system.build.mountScript = pkgs.writers.writeDash "disko-mount" ''
-      export PATH=${lib.makeBinPath (types.diskoLib.packages cfg.devices pkgs)}
+      export PATH=${lib.makeBinPath (types.diskoLib.packages cfg.devices pkgs)}:$PATH
       ${types.diskoLib.mount cfg.devices}
     '';
 
     system.build.disko = pkgs.writers.writeBash "disko" ''
-      export PATH=${lib.makeBinPath (types.diskoLib.packages cfg.devices pkgs)}
+      export PATH=${lib.makeBinPath (types.diskoLib.packages cfg.devices pkgs)}:$PATH
       ${types.diskoLib.zapCreateMount cfg.devices}
     '';
 

tests/default.nix

@@ -20,7 +20,7 @@ let
         (lib.attrNames (builtins.readDir ./.))
     );
 
-  allTests = lib.genAttrs (allTestFilenames) (test: import (./. + "/${test}.nix") { inherit makeDiskoTest; }) //
+  allTests = lib.genAttrs (allTestFilenames) (test: import (./. + "/${test}.nix") { inherit makeDiskoTest pkgs; }) //
              evalTest "lvm-luks-example" ../example/config.nix // {
                standalone = (pkgs.nixos [ ../example/stand-alone/configuration.nix ]).config.system.build.toplevel;
              };

tests/lib.nix

@@ -26,6 +26,7 @@
       tsp-create = pkgs.writeScript "create" ((pkgs.callPackage ../. { }).create (import disko-config { disks = builtins.tail disks; inherit lib; }));
       tsp-mount = pkgs.writeScript "mount" ((pkgs.callPackage ../. { }).mount (import disko-config { disks = builtins.tail disks; inherit lib; }));
       tsp-config = (pkgs.callPackage ../. { }).config (import disko-config { inherit disks; inherit lib; });
+      tsp-disko = pkgs.writeScript "disko" ((pkgs.callPackage ../. { }).zapCreateMount (import disko-config { disks = builtins.tail disks; inherit lib; }));
       num-disks = builtins.length (lib.attrNames (import disko-config { inherit lib; }).disk);
       installed-system = { modulesPath, ... }: {
         imports = [
@@ -60,9 +61,6 @@
           efiSupport = efi;
           efiInstallAsRemovable = efi;
         };
-        environment.systemPackages = [
-          pkgs.jq
-        ];
       };
       installedTopLevel = (eval-config {
         modules = [ installed-system ];
@@ -93,6 +91,9 @@
           (modulesPath + "/profiles/minimal.nix")
           extraConfig
         ];
+        environment.systemPackages = [
+          pkgs.jq
+        ];
 
         # speed-up eval
         documentation.enable = false;
@@ -127,20 +128,24 @@
           machine.succeed("${tsp-create}")
           machine.succeed("${tsp-mount}")
           machine.succeed("${tsp-mount}") # verify that the command is idempotent
+          machine.succeed("${tsp-disko}") # verify that we can destroy and recreate
         ''}
         ${lib.optionalString (testMode == "module") ''
           machine.succeed("${nodes.machine.system.build.formatScript}")
           machine.succeed("${nodes.machine.system.build.mountScript}")
           machine.succeed("${nodes.machine.system.build.mountScript}") # verify that the command is idempotent
+          machine.succeed("${nodes.machine.system.build.disko}") # verify that we can destroy and recreate again
         ''}
         ${lib.optionalString (testMode == "cli") ''
           # TODO use the disko cli here
           # machine.succeed("${../.}/disko --no-pkgs --mode create ${disko-config}")
           # machine.succeed("${../.}/disko --no-pkgs --mode mount ${disko-config}")
           # machine.succeed("${../.}/disko --no-pkgs --mode mount ${disko-config}") # verify that the command is idempotent
+          # machine.succeed("${../.}/disko --no-pkgs --mode zap_create_mount ${disko-config}") # verify that we can destroy and recreate again
           machine.succeed("${tsp-create}")
           machine.succeed("${tsp-mount}")
           machine.succeed("${tsp-mount}") # verify that the command is idempotent
+          machine.succeed("${tsp-disko}") # verify that we can destroy and recreate
         ''}
 
         ${lib.optionalString testBoot ''

tests/swap.nix

@@ -16,4 +16,7 @@ makeDiskoTest {
         '
     """);
   '';
+  extraConfig = {
+    environment.systemPackages = [ pkgs.jq ];
+  };
 }

types.nix

@@ -154,23 +154,11 @@ rec {
     */
     zapCreateMount = devices: ''
       set -efux
-      shopt -s nullglob
+      umount -Rv /mnt || :
-      # print existing disks
-      lsblk
 
-      # TODO get zap the same way we get create
+      for dev in ${toString (lib.catAttrs "device" (lib.attrValues devices.disk))}; do
-      # make partitioning idempotent by dismounting already mounted filesystems
+        ${./disk-deactivate}/disk-deactivate "$dev" | bash -x
-      if findmnt /mnt; then
-        umount -Rlv /mnt
-      fi
-
-      # stop all existing raids
-      if command -v mdadm; then
-        for r in /dev/md/* /dev/md[0-9]*; do
-          # might fail if the device was already closed in the loop
-          mdadm --stop "$r" || true
       done
-      fi
 
       echo 'creating partitions...'
       ${diskoLib.create devices}
@@ -912,6 +900,7 @@ rec {
         type = types.functionTo types.str;
         default = vg: ''
           lvcreate \
+            --yes \
             ${if hasInfix "%" config.size then "-l" else "-L"} ${config.size} \
             -n ${config.name} \
             ${optionalString (!isNull config.lvm_type) "--type=${config.lvm_type}"} \
@@ -1418,7 +1407,7 @@ rec {
         internal = true;
         readOnly = true;
         type = types.functionTo (types.listOf types.package);
-        default = pkgs: lib.optionals (!isNull config.content) (config.content._pkgs pkgs);
+        default = pkgs: [ pkgs.jq ] ++ lib.optionals (!isNull config.content) (config.content._pkgs pkgs);
       };
     };
   });