From 59173296aba560377f55dcc0527f2ddbb6c8d2ac Mon Sep 17 00:00:00 2001
From: Aaron Ball <nullspoon@oper.io>
Date: Wed, 14 Feb 2018 08:47:22 -0700
Subject: install-header:changed dd extraction block size

Previously, we extracted block=1B * sizeof(chunk). This was extremely
slow. Changing block size to sizeof(chunk) and count to 1, the process
is sped up by about 200x.
---
 install-header.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/install-header.sh b/install-header.sh
index a7b9269..b54a0ec 100755
--- a/install-header.sh
+++ b/install-header.sh
@@ -8,6 +8,8 @@ export SELF       # Absolute path to the installer script (me!)
 export TMP        # Path to tmp install staging directory
 export PAYLOAD    # Path to the extracted payload directory
 export NOCLEANUP  # Do not clean up deploy resources. Useful for debugging
+export COMPRESS   # Command to compress data
+export DECOMPRESS # Command to decompress data
 
 # Header:    0
 # runscript: 1
@@ -25,7 +27,7 @@ extract_chunk_index() {
 
   [ "${dest}" != '-' ] && of="of=${dest}"
   # Extract the requested chunk index
-  dd bs=1 count=${LENS[$index]} iflag=skip_bytes skip=${skip} \
+  dd bs=${LENS[$index]} count=1 iflag=skip_bytes skip=${skip} \
     if=${src} ${of} 2>/dev/null
 }
 
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