From 791de1929731f457ef789a7d7e5894cadab090df Mon Sep 17 00:00:00 2001
From: ading2210 <ading2019@gmail.com>
Date: Tue, 3 Oct 2023 10:39:24 -0700
Subject: [PATCH] check if binwalk has already been run

---
 bootloader/bin/bootstrap.sh |  6 +++---
 build.sh                    | 13 ++++++++++---
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/bootloader/bin/bootstrap.sh b/bootloader/bin/bootstrap.sh
index 2c81ec3..8766bf5 100644
--- a/bootloader/bin/bootstrap.sh
+++ b/bootloader/bin/bootstrap.sh
@@ -23,14 +23,14 @@ invoke_terminal() {
 
 enable_debug_console() {
   local tty="$1"
-  info -e '\033[1;33m[cros_debug] enabled on '${tty}'.\033[m'
+  echo -e '\033[1;33m[cros_debug] enabled on '${tty}'.\033[m'
   invoke_terminal "${tty}" "[Bootstrap Debug Console]" "/bin/busybox sh"
 }
 
 
 main() {
-  info "...:::||| Bootstrapping ChromeOS Factory Shim |||:::..."
-  info "TTY: ${TTY}, LOG: ${LOG_TTY}, INFO: ${INFO_TTY}, DEBUG: ${DEBUG_TTY}"
+  echo "...:::||| Bootstrapping ChromeOS Factory Shim |||:::..."
+  echo "TTY: ${TTY}, LOG: ${LOG_TTY}, echo: ${echo_TTY}, DEBUG: ${DEBUG_TTY}"
   echo "idk please work"
 
   enable_debug_console "/dev/pts/0"
diff --git a/build.sh b/build.sh
index c99c0e5..692cdd3 100755
--- a/build.sh
+++ b/build.sh
@@ -50,20 +50,27 @@ kernel_loop="${shim_loop}p2" #KERN-A should always be p2
 
 echo "copying shim kernel to new file in /tmp"
 kernel_dir=/tmp/shim_kernel
-rm -rf $kernel_dir
 mkdir $kernel_dir -p
 dd if=$kernel_loop of=$kernel_dir/kernel.bin bs=1M status=none
 
 echo "extracting data from kernel"
 previous_dir=$(pwd)
 cd $kernel_dir
-binwalk_out=$(binwalk --extract kernel.bin --run-as=root)
+if [ -e "${kernel_dir}/binwalk.out" ]; then
+  #don't run binwalk again if we don't need to
+  binwalk_out=$(cat $kernel_dir/binwalk.out)
+else
+  binwalk_out=$(binwalk --extract kernel.bin --run-as=root)
+  echo $binwalk_out > $kernel_dir/binwalk.out
+fi
 #i can't be bothered to learn how to use sed
 extracted_file=$(echo $binwalk_out | pcregrep -o1 "\d+\s+0x([0-9A-F]+)\s+gzip compressed data")
 
 echo "extracting initramfs archive from kernel (this may take a while)"
 cd _kernel.bin.extracted/
-binwalk --extract $extracted_file --run-as=root > /dev/null
+if [ ! -e "_${extracted_file}.extracted/" ]; then
+  binwalk --extract $extracted_file --run-as=root > /dev/null
+fi
 cd "_${extracted_file}.extracted/"
 cpio_file=$(file ./* | pcregrep -o1 "([0-9A-F]+):\s+ASCII cpio archive")