[PATCH 35/50] POSIX-ize all the shell scripts that get installed to the initramfs.

Also install all the scripts using inst, so that we can install the right
shell interpreter for our scripts.  We still install bash as well.

dracut

@@ -108,9 +108,9 @@ if [ -f /etc/sysconfig/i18n ]; then
 fi
 
 # install our files
-cp $initfile "$initdir/init"
-cp $switchroot "$initdir/sbin/switch_root"
-cp $echoer "$initdir/echoer"
+inst "$initfile" "/init"
+inst "$switchroot" "/sbin/switch_root"
+inst "$echoer" "/echoer"
 for hookdir in $hookdirs; do
     for hook in "$dsrc/$hookdir"/*; do
 	[[ -f $hook ]] && inst "$hook" "/$hookdir/${hook##*/}"

echoer

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 target=$1
 shift
 echo "$@" >"$target"

init

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # Licensed under the GPLv2
 #
@@ -10,28 +10,28 @@ emergency_shell()
     echo ; echo
     echo "Bug in initramfs /init detected. Dropping to a shell. Good luck!"
     echo
-    bash < /dev/console
+    sh < /dev/console
 }
 
 getarg() {
     local o;
-    for o in $(< /proc/cmdline); do
-	[[ $o == $1 ]] && { echo $o; break; }
+    for o in $(cat /proc/cmdline); do
+	[ "${o%%=*}" = "$1" ] && { echo $o; break; }
     done
     return 1
 }
 
 source_all() {
     local f
-    [[ $1 &&  -d /$1 ]] || return
-    for f in "/$1"/*; do [[ -f $f ]] && . "$f"; done
+    [ "$1" ] && [  -d "/$1" ] || return
+    for f in "/$1"/*; do [ -f "$f" ] && . "$f"; done
 }
 
 echo "Starting initrd..."
 export PATH=/sbin:/bin:/usr/sbin:/usr/bin
 export TERM=linux
 
-trap "emergency_shell" 0 2
+trap "emergency_shell" 0
 # /dev/console comes from the built-in initramfs crud in the kernel
 # someday, we may need to mkdir /dev first here
 exec > /dev/console 2>&1 < /dev/console
@@ -63,7 +63,7 @@ NEWROOT="/sysroot"
 # FIXME: there's got to be a better way ...
 # it'd be nice if we had a udev rule that just did all of the bits for
 # figuring out what the specified root is and linking it /dev/root
-root=$(getarg 'root=*'); root=${root#root=}
+root=$(getarg root); root=${root#root=}
 case $root in
     LABEL=*) root=${root#LABEL=}
              root=${root//\//\\x2f}
@@ -80,7 +80,7 @@ udevadm settle --timeout=30
 source_all pre-mount
 
 echo "Trying to mount rootfs $root"
-[[ -e $root ]] || emergency_shell
+[ -e "$root" ] || emergency_shell
 ln -s "$root" /dev/root    
 mount -o ro /dev/root $NEWROOT || emergency_shell
 

pre-mount/50cryptroot

@@ -1,6 +1,7 @@
-#!/bin/bash
-[[ -f /cryptroot ]] || return
-echo "Encrypted root detected."
-cryptopts=$(< /cryptroot)
-/sbin/cryptsetup luksOpen $cryptopts || emergency_shell
-udevadm settle --timeout=30
+#!/bin/sh
+[ -f /cryptroot ] && { 
+    echo "Encrypted root detected."
+    cryptopts=$(cat /cryptroot)
+    /sbin/cryptsetup luksOpen $cryptopts || emergency_shell
+    udevadm settle --timeout=30
+}

pre-mount/99resume

@@ -1,7 +1,10 @@
-#!/bin/bash
-resume=$(getarg 'resume=*') || return
-resume=${resume#resume=}
-[[ -b $resume ]] || return
-# parsing the output of ls is Bad, but until there is a better way...
-read x x x x maj min x < <(ls -lH "$resume")
-echo "${maj/,/}:$min"> /sys/power/resume
+#!/bin/sh
+resume=$(getarg resume) && {
+    resume=${resume#resume=}
+    [ -b "$resume" ] && {
+        # parsing the output of ls is Bad, but until there is a better way...
+	ls -lH "$resume" | ( 
+	    read x x x x maj min x;
+	    echo "${maj%,}:$min"> /sys/power/resume)
+    }
+}

pre-pivot/50selinux-loadpolicy

@@ -1,10 +1,11 @@
-#!/bin/bash
+#!/bin/sh
 # FIXME: load selinux policy.  this should really be done after we switchroot 
-[[ -x $NEWROOT/usr/sbin/load_policy ]] || return
-chroot $NEWROOT /usr/sbin/load_policy -i
-if (($? == 3)); then
+[ -x "$NEWROOT/usr/sbin/load_policy" ] && {
+    chroot $NEWROOT /usr/sbin/load_policy -i
+    if [ $? -eq 3 ]; then
 	echo "Initial SELinux policy load failed and enforcing mode requested."
 	echo "Not continuing"
 	sleep 100d
 	exit 1
-fi
+    fi
+}