From 9dddbfed944f9afaa3ebba37e65d20b5a0ad85bf Mon Sep 17 00:00:00 2001
From: Aaron Ball <nullspoon@oper.io>
Date: Sun, 5 Mar 2023 10:50:42 -0700
Subject: Remove clear and cat from output init ram fs

Both the clear and cat commands are not technically required, as they
have bash builtin equivelants. This will shave off tens of kilobytes
(very little unfortunately).

This also changes the syntax of the parse_cmdline function to something
more reasonable, also no longer using cat but using a bash builtin.
---
 init        | 11 ++++++-----
 mkinitramfs |  4 ++--
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/init b/init
index b1d3fca..51758a9 100755
--- a/init
+++ b/init
@@ -23,10 +23,10 @@ export MOUNTOPTS=()
 
 screen_init() {
   # Clear screen
-  [ "${QUIET}" -eq 1 ] && clear
+  [ "${QUIET}" -eq 1 ] && printf '\033c'
 
   # Output message file if it exists
-  [ -f /etc/msg ] && cat /etc/msg
+  [ -f /etc/msg ] && printf '%s\n' "$(</etc/msg)"
 }
 
 
@@ -58,10 +58,11 @@ log() {
  
 #
 # Resolves the path to the root device from the cmdline root= syntax.
-# Currently handles UUID syntax and /dev/sdx syntax
+# Currently handles UUID syntax and /dev/sdx syntax, btrfs subvols, debugging,
+# and quiet options.
 #
 parse_cmdline() {
-  local cmdline=${1}
+  local cmdline="$(<${1:?})"
 
   for i in ${cmdline[@]}; do
     case "${i}" in
@@ -159,7 +160,7 @@ main() {
     log INFO "Fake root location ${fakeroot} does not exist. Cannot boot."
   fi
 
-  parse_cmdline "$(cat /proc/cmdline)"
+  parse_cmdline /proc/cmdline
 
   # display fanciful boot image
   screen_init
diff --git a/mkinitramfs b/mkinitramfs
index 676c770..70802a2 100755
--- a/mkinitramfs
+++ b/mkinitramfs
@@ -203,14 +203,14 @@ function main {
 
   # List of binaries to exist in the new initramfs
   # Standard shell binaries
-  resolve_bins bash cat pidof ps ls clear grep less switch_root kill
+  resolve_bins bash pidof ps ls grep less switch_root kill
   # Module management
   resolve_bins udevadm udevd modprobe rmmod
   # For encrypted and block device support
   resolve_bins partprobe dmsetup mount umount cryptsetup
 
   # For debugging
-  #resolve_bins sleep mkdir chmod chown tr
+  #resolve_bins sleep mkdir chmod chown tr clear cat
 
   # Set up the archive source dir.
   cache_dir_setup ${cache}
-- 
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