From f6e4c392a2709420434a987b288d9ea90e9b5542 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Sun, 11 Oct 2020 01:38:17 -0400
Subject: Installed and successfully ran btrfs dev rem.

Ran it in the VM with the command:

  make install; sudo ./src/mkinitramfs-samizdat ; sudo bash ./src/parted-usb.sh

Didn't use the .patch.btrfs here yet.
---
 src/initrd/btrfs-create.sh | 61 ++++++++++++++++++++++------------------------
 src/initrd/grok-block      |  4 +++
 src/parted-usb.sh          | 11 ++++++++-
 3 files changed, 43 insertions(+), 33 deletions(-)

diff --git a/src/initrd/btrfs-create.sh b/src/initrd/btrfs-create.sh
index 9604340..c3cfcbb 100644
--- a/src/initrd/btrfs-create.sh
+++ b/src/initrd/btrfs-create.sh
@@ -71,13 +71,15 @@ losetup_layers()
         done
     elif [ -e /dev/disk/by-partlabel/samizdat-rootfs ]
     then
-        local dev
-        for dev in samizdat-rootfs
-        do
-            umount /dev/disk/by-partlabel/$dev
-            dd if=/dev/zero of=/$dev.rw bs=1M count=10
-            dm_snapshot /dev/disk/by-partlabel/$dev /$dev.rw
-        done
+        # TODO: prevent raciness
+        umount /dev/disk/by-partlabel/samizdat-rootfs
+        if [ -e /dev/disk/by-partlabel/samizdat-patchfs ]
+        then
+            umount /dev/disk/by-partlabel/samizdat-patchfs
+            mountdev=/dev/disk/by-partlabel/samizdat-patchfs
+        else
+            mountdev=/dev/disk/by-partlabel/samizdat-rootfs
+        fi
     else
         bootwait samizdat-nbd-dev
         local dev
@@ -93,20 +95,24 @@ init_samizdat()
 {
   local blockdev="$1" imgfile="$2" uuid
 
-  losetup_layers                                   || return
-  modprobe btrfs                                   || return
-  btrfs device scan                                || return
+  losetup_layers                        || return
+  modprobe btrfs                        || return
+  btrfs device scan                     || return
 
-  uuid=$(choose_uuid)                              || return
-  [ "$uuid" ]                                      || return
-
-  mount -t btrfs UUID="$uuid" /root || return
+  if [ "$mountdev" ]
+  then
+      mount -t btrfs "$mountdev" /root  || return
+  else
+      uuid=$(choose_uuid)               || return
+      [ "$uuid" ]                       || return
+      mount -t btrfs UUID="$uuid" /root || return
+  fi
 
-  btrfs device add "$blockdev" /root               || return
-  mount -o rw,remount /root                        || return
-  samizdat_movemounts "$imgfile"                   || return
+  btrfs device add "$blockdev" /root    || return
+  mount -o rw,remount /root             || return
+  samizdat_movemounts "$imgfile"        || return
 
-  initialize_root_filesystem                       || return
+  initialize_root_filesystem            || return
 }
 
 movemounts()
@@ -248,24 +254,15 @@ filesystem_incomplete()
 
 partition_new_hard_drive_DESTROYING_EVERYTHING()
 {
-    # TODO: get the actual size of the btrfs master and actually triple it. The empty
-    # space can be left available to allow the local machine to boot a
-    # locally-regenerated rootfs seed.
-    sz=3
-    u=GiB
-    actual_sz=$sz$u
-    tripled_sz=$((sz * 3))$u
-    pct=100% # TODO: use 50%
-
-    local target="$1" sz=6GiB
+    local target="$1" sz=2910
     # [ "$(parted -sm "$target" print | grep -c :)"  = 1 ] || return
     parted "$target" -sm                                                     \
-           unit B                                                            \
+           unit MiB                                                          \
            mklabel gpt                                                       \
-           mkpart samizdat-grub-incomplete 32KiB 8MiB                        \
+           mkpart samizdat-grub-incomplete 1 8                               \
            set 1 bios_grub on                                                \
-           mkpart samizdat-plaintext-incomplete btrfs 64MiB $actual_sz       \
-           mkpart samizdat-luks-encrypted-incomplete $tripled_sz $pct        \
+           mkpart samizdat-plaintext-incomplete btrfs 64 $((sz + 64))        \
+           mkpart samizdat-luks-encrypted-incomplete $((sz + 64)) 100%       \
         &&
         udevadm settle
 }
diff --git a/src/initrd/grok-block b/src/initrd/grok-block
index 0b5f3f9..f925061 100755
--- a/src/initrd/grok-block
+++ b/src/initrd/grok-block
@@ -186,6 +186,7 @@ grok_block()
           return
           ;;
       samizdat-keys) ;;
+      samizdat-rootfs) ;;
       samizdat-grub) return ;;
       samizdat-luks-encrypted)
           menu-select boot-native "$(parent_device "$DEVNAME")"
@@ -219,6 +220,9 @@ grok_block()
       # TODO: Need option to boot the partitions we create
       # TODO: And what if we create partitions and then reboot the machine mid-install?
 
+  elif [ "$ID_PART_ENTRY_NAME" = samizdat-rootfs ]; then
+      :
+
   elif [ "$ID_PART_ENTRY_NAME" = samizdat-keys ]; then
       mkdir -p /gpg
       cp -a "$mountpoint"/gnupghome /gpg/ && bootdone samizdat-gpg && bootdone samizdat-cdrom
diff --git a/src/parted-usb.sh b/src/parted-usb.sh
index 50fcb78..0f62019 100755
--- a/src/parted-usb.sh
+++ b/src/parted-usb.sh
@@ -199,7 +199,8 @@ boot_vm()
         -smp 2 \
         -m 512 \
         -k en-us \
-        -net nic,model=virtio,macaddr=$MAC \
+        -net nic,model=virtio,macaddr="$MAC" \
+        -net tap,ifname=tap0,script=no,downscript=no \
         -vga qxl \
         -drive file="$boot_drive",format=raw \
         -drive file="$installer_target",format=raw
@@ -207,6 +208,14 @@ boot_vm()
 
 . samizdat-paths.sh || die 'samizdat-paths.sh not found'
 samizdat_linux_dir=/boot
+
+
+
+ROOTFS=rootfs/samizdat.seed.btrfs
+PATCHFS=rootfs/samizdat.patch.btrfs
+GPG_INPUT_DIR=/root/.gnupg
+
+
 : ${GPG_INPUT_DIR:=/cdrom/gnupghome}
 : ${GRUB_CONFIG:=conf/grub.cfg}
 start_keys=64 # megs
-- 
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