remove bashism in various boot scripts

When using dash as initramfs shell, the boot process is broken.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>

modules.d/90crypt/crypt-lib.sh

@@ -191,7 +191,7 @@ readkey() {
     local device="$3"
 
     # No mounting needed if the keyfile resides inside the initrd
-    if [ "/" == "$keydev" ]; then
+    if [ "/" = "$keydev" ]; then
         local mntp=/
     else
         # This creates a unique single mountpoint for *, or several for explicitly

modules.d/90crypt/parse-keydev.sh

@@ -18,7 +18,7 @@ if getargbool 1 rd.luks -n rd_NO_LUKS && \
         fi
 
         # A keydev of '/' is treated as the initrd itself
-        if [ "/" == "$keydev" ]; then
+        if [ "/" = "$keydev" ]; then
             [ -z "$luksdev" ] && luksdev='*'
             echo "$luksdev:$keydev:$keypath" >> /tmp/luks.keys
             continue

modules.d/91crypt-gpg/crypt-gpg-lib.sh

@@ -53,7 +53,7 @@ gpg_decrypt() {
         --tries 3 --tty-echo-off
 
     # Clean up the smartcard gpg-agent
-    if [ "${useSmartcard}" == "1" ]; then
+    if [ "${useSmartcard}" = "1" ]; then
         GNUPGHOME="$gpghome" gpg-connect-agent 1>/dev/null killagent /bye
     fi
 

modules.d/95dcssblk/parse-dcssblk.sh

@@ -2,7 +2,7 @@
 # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
 # ex: ts=8 sw=4 sts=4 et filetype=sh
 dcssblk_arg=$(getarg rd.dcssblk=)
-if [ $? == 0 ];then
+if [ $? = 0 ];then
 	info "Loading dcssblk segments=$dcssblk_arg"
 	modprobe dcssblk segments=$dcssblk_arg
 fi

modules.d/98syslog/rsyslogd-start.sh

@@ -38,7 +38,7 @@ rsyslog_config() {
 [ -f /tmp/syslog.conf ] && read conf < /tmp/syslog.conf
 [ -z "$conf" ] && conf="/etc/rsyslog.conf" && echo "$conf" > /tmp/syslog.conf
 
-if [ $type == "rsyslogd" ]; then
+if [ $type = "rsyslogd" ]; then
     template=/etc/templates/rsyslog.conf
     if [ -n "$server" ]; then
         rsyslog_config "$server" "$template" "$filters" > $conf