From 76b2e276f152c9a014c1fd920a867133b2a1c929 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@cryptonomic.net>
Date: Mon, 18 Jan 2021 22:07:15 -0500
Subject: hybrid mbr

---
 partitions/part3.conf |  6 ++--
 partitions/part4.conf |  7 +++--
 partitions/part5.conf |  4 +--
 partitions/part6.conf |  6 ++--
 partitions/part7.conf |  4 +--
 partitions/part8.conf |  7 ++---
 src/partvi            | 78 ++++++++++++++++++---------------------------------
 7 files changed, 44 insertions(+), 68 deletions(-)

diff --git a/partitions/part3.conf b/partitions/part3.conf
index 7d05206..63d44ea 100644
--- a/partitions/part3.conf
+++ b/partitions/part3.conf
@@ -1,4 +1,4 @@
-name=samizdat-keys
-type=samizdat-keys
-allocation=256M
+name=samizdat-boot
+type=boot
+allocation=200M
 rebuild=always
diff --git a/partitions/part4.conf b/partitions/part4.conf
index 08e4196..7d05206 100644
--- a/partitions/part4.conf
+++ b/partitions/part4.conf
@@ -1,3 +1,4 @@
-name=samizdat-root-seed
-type=dm-verity-data
-data_path=../rootfs/samizdat.seed.btrfs
+name=samizdat-keys
+type=samizdat-keys
+allocation=256M
+rebuild=always
diff --git a/partitions/part5.conf b/partitions/part5.conf
index 0075c91..08e4196 100644
--- a/partitions/part5.conf
+++ b/partitions/part5.conf
@@ -1,3 +1,3 @@
-name=samizdat-root-seed-verity
-type=dm-verity-hashes
+name=samizdat-root-seed
+type=dm-verity-data
 data_path=../rootfs/samizdat.seed.btrfs
diff --git a/partitions/part6.conf b/partitions/part6.conf
index 7a77685..0075c91 100644
--- a/partitions/part6.conf
+++ b/partitions/part6.conf
@@ -1,3 +1,3 @@
-name=samizdat-rootfs
-type=dm-verity-data
-data_path=../rootfs/samizdat.patch.btrfs
+name=samizdat-root-seed-verity
+type=dm-verity-hashes
+data_path=../rootfs/samizdat.seed.btrfs
diff --git a/partitions/part7.conf b/partitions/part7.conf
index 8298fd3..7a77685 100644
--- a/partitions/part7.conf
+++ b/partitions/part7.conf
@@ -1,3 +1,3 @@
-name=samizdat-root-patch-verity
-type=dm-verity-hashes
+name=samizdat-rootfs
+type=dm-verity-data
 data_path=../rootfs/samizdat.patch.btrfs
diff --git a/partitions/part8.conf b/partitions/part8.conf
index 63d44ea..8298fd3 100644
--- a/partitions/part8.conf
+++ b/partitions/part8.conf
@@ -1,4 +1,3 @@
-name=samizdat-boot
-type=boot
-allocation=200M
-rebuild=always
+name=samizdat-root-patch-verity
+type=dm-verity-hashes
+data_path=../rootfs/samizdat.patch.btrfs
diff --git a/src/partvi b/src/partvi
index dca9722..4a9d774 100755
--- a/src/partvi
+++ b/src/partvi
@@ -181,44 +181,6 @@ set_var()
         eval "conf_${img}_${1}=\$${1}"
 }
 
-create_dmsetup_map()
-{
-        part=$builddir/${f%.conf}
-
-        if [ -h "$part" ]
-        then
-                partuuid=$(readlink -e "$part")
-        else
-                partuuid=
-        fi
-
-        $sudo losetup -L -f "$part"
-        dev=$(losetup -j "$part" -O NAME --noheadings)
-        devsz=$($sudo blockdev --getsz $dev)
-
-        alignment_error=$((devsz % 2048))
-
-        printf '%d %d linear %s 0\n' $start $devsz "$dev" >> "$map"
-
-        set_var start
-        set_var devsz
-        start=$((start + devsz))
-
-        if [ $alignment_error -gt 0 ]
-        then
-                devsz=$((2048 - alignment_error))
-                printf '%d %d zero\n' $start $devsz >> "$map"
-                start=$((start + devsz))
-        fi
-}
-
-create_ptable_conf_debug()
-{
-        set -x
-        create_ptable_conf "$@"
-        set +x
-}
-
 create_ptable_conf()
 {
         #inquire_var start && inquire_var devsz || return
@@ -228,20 +190,35 @@ create_ptable_conf()
 
         [ "$((devsz % 512))" -eq 0 ]
 
+        start_sectors=$((start / 512))
+        size_sectors=$((devsz / 512))
+
+        typecode=0FC63DAF-8483-4772-8E79-3D69D8477DE4
         case "$type" in
                 partition-table) start=$((start + devsz)); return;;
                 efi-system-partition) typecode=C12A7328-F81F-11D2-BA4B-00A0C93EC93B ;;
                 bios-grub)            typecode=21686148-6449-6E6F-744E-656564454649 ;;
-                *)                    typecode=0FC63DAF-8483-4772-8E79-3D69D8477DE4 ;;
+                boot)
+                    printf 'start=1, size=%d, type=ee\n' \
+                           "$((start_sectors - 1))" \
+                           >> "$DOS_TABLE_FILE"
+                    printf 'start=%d, size=%d, type=83, bootable\n' \
+                           "$start_sectors" \
+                           "$size_sectors" \
+                           >> "$DOS_TABLE_FILE"
+                    printf 'start=%d, type=ee\n' \
+                           "$((start_sectors + size_sectors))" \
+                           >> "$DOS_TABLE_FILE"
+                    ;;
         esac
 
         printf '%d: start=%d, size=%d, type=%s, name="%s"\n' \
                 "$i" \
-                "$((start / 512))" \
-                "$((devsz / 512))" \
+                "$start_sectors" \
+                "$size_sectors" \
                 "$typecode" \
                 "$name" \
-                >> "$ptable.sfdisk"
+                >> "$GPT_TABLE_FILE"
         let ++i
         start=$((start + devsz))
 }
@@ -288,21 +265,20 @@ END
 
 pee_on_table()
 {
+        GPT_TABLE_FILE=$builddir/table.gpt
+        DOS_TABLE_FILE=$builddir/table.mbr
+
         local dev="$1"
-        ptable=$builddir/ptable.bin
         i=1
         start=0
 
-        sfdisk_init "$dev" > "$ptable".sfdisk
-
-        iterate_partitions create_ptable_conf_debug
-
-        cat "$ptable".sfdisk >&2
+        sfdisk_init "$dev" > "$GPT_TABLE_FILE"
+        : > "$DOS_TABLE_FILE"
+        iterate_partitions create_ptable_conf
 
         set -x
-        $sudo sfdisk "$dev" < "$ptable".sfdisk || return
-        $sudo sfdisk --dump "$dev" || return
-        $sudo sfdisk -Y MBR --dump "$dev" || return
+        $sudo sfdisk "$dev" < "$GPT_TABLE_FILE" || return
+        $sudo sfdisk -Y dos "$dev" < "$DOS_TABLE_FILE" || return
 }
 
 truncate -s0 whole.img
-- 
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