AK3: add support for resizing logical partitions (#69)

- add flash_generic support for flashing to dynamic/logical partitions larger than stock using phhusson's lptools binary
- enable full automated support for flashing custom vendor_dlkm.img (note: must NOT be sparse format; factory images are sparse, but images generated from source are not)

Co-authored-by: Chris Renshaw <osm0sis@outlook.com>

tools/ak3-core.sh

@@ -437,8 +437,14 @@ flash_generic() {
     if [ ! "$imgblock" ]; then
       abort "$1 partition could not be found. Aborting...";
     fi;
-    # TODO: add dynamic partition resizing using lptools_static instead of aborting
-    if [ "$(wc -c < $img)" -gt "$(wc -c < $imgblock)" ]; then
+    if [ "$path" == "/dev/block/mapper" ]; then
+      $bin/lptools_static remove $1_ak3;
+      $bin/lptools_static create $1_ak3 $(wc -c < $img) || abort "Creating $1_ak3 failed. Aborting...";
+      $bin/lptools_static unmap $1_ak3 || abort "Unmapping $1_ak3 failed. Aborting...";
+      $bin/lptools_static map $1_ak3 || abort "Mapping $1_ak3 failed. Aborting...";
+      $bin/lptools_static replace $1_ak3 $1$slot || abort "Replacing $1$slot failed. Aborting...";
+      imgblock=/dev/block/mapper/$1_ak3;
+    elif [ "$(wc -c < $img)" -gt "$(wc -c < $imgblock)" ]; then
       abort "New $1 image larger than $1 partition. Aborting...";
     fi;
     isro=$(blockdev --getro $imgblock 2>/dev/null);
@@ -470,10 +476,10 @@ flash_dtbo() { flash_generic dtbo; }
 
 ### write_boot (repack ramdisk then build, sign and write image, vendor_dlkm and dtbo)
 write_boot() {
-  flash_generic vendor_dlkm; # TODO: move below boot once resizing is supported
   repack_ramdisk;
   flash_boot;
   flash_generic vendor_boot; # temporary until hdr v4 can be unpacked/repacked fully by magiskboot
+  flash_generic vendor_dlkm;
   flash_generic dtbo;
 }
 ###