contrib/alpine: fix install script, grep for contrib/alpine

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

contrib/alpine/install.sh

@@ -1,45 +1,53 @@
 #!/bin/sh
 
-if [ "x`id -u`" != "x0" ]; then
-    echo
-    echo "*** This script must run as root"
-    echo
+if [ "$(id -u)" != "0" ]; then
+    printf "\n\e[1m*** This script must run as root\e[0m\n\n"
     exit 1
 fi
 
+# shellcheck disable=SC3037,SC3045,SC2154
+yorn()
+{
+    printf "\e[1m> %s (y/N)?\e[0m " "$*"
+    read -rn1 yorn
+    echo
+
+    if [ "$yorn" = "y" ] || [ "$yorn" = "Y" ]; then
+	return 0
+    fi
+
+    return 1
+}
+
 # Adjust base directory
-grep -q alpine Makefile 2>/dev/null
-if [ $? -eq 0 ]; then
+if grep -q contrib/alpine Makefile 2>/dev/null; then
     cd ../..
-elif [ ! -e configure.ac ]; then
-    echo "*** Please run this script from the Finit base directory."
+fi
+
+if [ ! -e configure.ac ]; then
+    printf "\n\e[1m*** Please run this script from the Finit base directory.\e[0m\n"
     exit 1
 fi
 
-echo
-echo "*** Install Finit on Alpine Linux"
-echo "========================================================================"
-echo "/sbin/finit           - PID 1"
-echo "/lib/finit/plugins/*  - All enabled Finit plugins"
-echo "/etc/finit.conf       - Finit configuration file"
-echo "/etc/finit.d/         - Finit services"
-echo
-read -p "Do you want to continue (y/N)? " yorn
+printf "\n\e[1mInstall Finit on Alpine Linux\n"
+printf "========================================================================\e[0m\n"
+printf "/sbin/finit           - PID 1\n"
+printf "/lib/finit/plugins/*  - All enabled Finit plugins\n"
+printf "/etc/finit.conf       - Finit configuration file\n"
+printf "/etc/finit.d/         - Finit services\n"
 
-if [ "x$yorn" = "xy" -o "x$yorn" = "xY" ]; then
-    echo
-    echo "*** Installing Finit files ..."
+if yorn "Do you want to continue"; then
+    printf "\n\e[1m*** Installing Finit files ...\e[0m\n"
     make install
-    cd /usr/share/doc/finit/contrib/alpine
+    cd /usr/share/doc/finit/contrib/alpine || exit 1
     for file in finit.conf rc.local; do
 	install -vbD $file /etc/$file
     done
     cp -va finit.d /etc/
 
-    read -p "*** Install Finit as the system default Init (y/N)? " yorn
-    if [ "x$yorn" = "xy" -o "x$yorn" = "xY" ]; then
-	echo "*** Updating /sbin/init symlink --> finit ..."
-	cd /sbin
+    if yorn "Install Finit as the system default Init"; then
+	printf "\e[1m*** Updating /sbin/init symlink --> finit ...\e[0m\n"
+	cd /sbin || exit 1
 	rm init
 	ln -s finit init
 
@@ -48,10 +56,8 @@ if [ "x$yorn" = "xy" -o "x$yorn" = "xY" ]; then
 	ln -s reboot shutdown
 	ln -s reboot suspend
     fi
-    echo "*** Done"
+    printf "\n\e[1m*** Done\e[0m\n"
     echo
 else
-    echo
-    echo "*** Aborting install."
-    echo
+    printf "\n\e[1m*** Aborting install.\e[0m\n\n"
 fi