From dc47371b7329aeda490142d8a42e0cc183f81ed6 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Sat, 10 Oct 2020 22:02:09 -0400
Subject: i think it works

---
 .gitignore        |   2 +
 src/parted-usb.sh | 111 +++++++++++++++++++++++-------------------------------
 2 files changed, 50 insertions(+), 63 deletions(-)

diff --git a/.gitignore b/.gitignore
index 8649537..c04983b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,3 +55,5 @@ apt-get-update-stamp
 *.btrfs.verity.log.asc
 *.btrfs.verity.log.sig
 /rootfs/*.btrfs.tmp.*
+*.img
+*.tmp
diff --git a/src/parted-usb.sh b/src/parted-usb.sh
index 8c3c048..c7040c8 100755
--- a/src/parted-usb.sh
+++ b/src/parted-usb.sh
@@ -51,21 +51,6 @@ partition_target()
 
 make_target_bootable()
 {
-    if [ -b "$target" ]
-    then
-        dev=$target
-        part=$target
-        mnt=/mnt/${target#/dev/}
-    else
-        losetup -f "$target"
-        dev=$(losetup -j "$target" -O NAME --noheadings)
-
-        kpartx -vasas "$dev"
-        part=/dev/mapper/${dev##*/}p
-
-        mnt=$target.mnt
-    fi
-
     mkfs.btrfs -f --mixed "$part"2
     mkdir -p "$mnt"
     mount "$part"2 "$mnt"
@@ -77,39 +62,39 @@ make_target_bootable()
     sync
 }
 
-release_target_kernel_resources()
+acquire_target_block_devices()
 {
-    umount "$mnt"
-    case "$dev" in
-        /dev/loop*)
-            kpartx -d "$dev"
-            losetup -d "$dev"
-            ;;
-    esac
-}
-
-with_target()
-{
-    local mnt dev target="$1"
-    shift
     if [ -b "$target" ]
     then
+        dev=$target
+        part=$target
         mnt=/mnt/${target#/dev/}
-        dev=${target}2
     else
-        losetup -f "$target" -o $(MiB $start_keys)
+        trap release_target_block_devices EXIT
+        losetup -f "$target"
         dev=$(losetup -j "$target" -O NAME --noheadings)
+
+        kpartx -vasas "$dev"
+        part=/dev/mapper/${dev##*/}p
+
         mnt=$target.mnt
     fi
+}
 
-    mkdir -p "$mnt"
-    mount "$dev" "$mnt"
-    "$@"
-    umount "$mnt"
-
-    case "$dev" in
-        /dev/loop*) losetup -d "$dev" ;;
-    esac
+release_target_block_devices()
+{
+    (
+        set +e
+        [ -z "$mnt" ] || ! mountpoint "$mnt" || umount "$mnt"
+        case "$dev" in
+            /dev/loop*)
+                kpartx -d "$dev"
+                losetup -d "$dev"
+                ;;
+        esac
+        true
+    )
+    unset mnt dev
 }
 
 add_keys()
@@ -117,9 +102,9 @@ add_keys()
     rsync  -a  --info=STATS  "$GPG_INPUT_DIR"/ "$mnt"/gnupghome/
 }
 
-initrd_suffix=.samizdat
 add_initrd()
 {
+    initrd_suffix=.samizdat
     mkdir -p "$mnt"/linux
     rsync  -aL --info=STATS "${1}vmlinuz${2}" "$mnt"/linux/vmlinuz
     rsync  -aL --info=STATS "${1}initrd.img${2}${initrd_suffix}" "$mnt"/linux/initrd.img
@@ -133,6 +118,7 @@ add_grub_cfg()
 
 individualize()
 {
+    mountpoint "$mnt" || mount "$part"2 "$mnt"
     add_keys
     add_initrd "$samizdat_linux_dir"/ "${version_suffix}"
     add_grub_cfg
@@ -140,14 +126,10 @@ individualize()
 
 globalize()
 {
-    : initialize
     initialize_target
-    : partition
     partition_target
-    : install-grub
+    acquire_target_block_devices
     make_target_bootable
-    : release
-    release_target_kernel_resources
 }
 
 sanity_checks()
@@ -159,12 +141,6 @@ sanity_checks()
     done
 }
 
-individualize_target_from()
-{
-    cp -T --reflink=always "$1" "$target"
-    with_target "$target" individualize
-}
-
 find_mac()
 {
     start_mac=$1
@@ -181,7 +157,9 @@ find_mac()
 
 boot_vm()
 {
+    boot_drive=$1
     installer_target=samizdat.disk.img
+
     if [ ! -e "$installer_target" ]
     then
         fallocate -l 15G "$installer_target"
@@ -195,7 +173,7 @@ boot_vm()
         -k en-us \
         -net nic,model=virtio,macaddr=$MAC \
         -vga qxl \
-        -drive file="$final",format=raw \
+        -drive file="$boot_drive",format=raw \
         -drive file="$installer_target",format=raw
 }
 
@@ -206,31 +184,38 @@ samizdat_linux_dir=/boot
 start_keys=64 # megs
 end_keys=256 # megs
 
-if [ "$1" ]
+if [ "$KERNEL_VERSION" ]
 then
-    version_suffix=-$1
+    version_suffix=-$KERNEL_VERSION
 fi
 
 sanity_checks
 set -e
 
-if [ "$TARGET" ]
+if [ "$1" ]
 then
-    target=$TARGET globalize
-    with_target "$TARGET" individualize
-    final=$TARGET
-    boot_vm
+    [ -b "$1" ] || die "Not a block device: $1"
+    target=$1
+    globalize
+    individualize
+    release_target_block_devices
 else
     template=boot-disk.template.img
-    target=boot-disk.img.tmp
-    final=${target%.tmp}
     if [ ! -e "$template" ]
     then
         target="$template".tmp globalize
+        release_target_block_devices
         mv -T "$template".tmp "$template"
     fi
+
+    target=boot-disk.img.tmp
     cp -T --reflink=always "$template" "$target"
-    with_target "$target" individualize
+    acquire_target_block_devices
+    individualize
+    release_target_block_devices
+
+    final=${target%.tmp}
     mv -T "$target" "$final"
-    boot_vm
+    target=$final
 fi
+boot_vm "$target"
-- 
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