Merge pull request #75 from nix-community/zap2HEADmaster

zap only devices we care about

2 files changed, 83 insertions, 0 deletions

diff --git a/disk-deactivate/disk-deactivate b/disk-deactivate/disk-deactivate
new file mode 100755
index 0000000..7dcd753
--- /dev/null
+++ b/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"
diff --git a/disk-deactivate/disk-deactivate.jq b/disk-deactivate/disk-deactivate.jq
new file mode 100644
index 0000000..54d98f7
--- /dev/null
+++ b/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")
+