Add version output option and info

Now supports both --version and "version and outputs detailed version
information.  Tested on FreeBSD, macOS, and Windows 10 64-bit.

Sample Output:

EasyRSA Version Information
Version:     git-development
Generated:   Tue Apr 14 18:54:42 CDT 2020
SSL Lib:     OpenSSL 1.1.1a-freebsd  20 Nov 2018
Git Commit:  f0129cfe6222820a85db2d394ab73d3c7759c5be
Source Repo: https://github.com/OpenVPN/easy-rsa

This closes #372

Signed-off-by: Eric F Crist <ecrist@secure-computing.net>

build/build-dist.sh

@@ -79,7 +79,11 @@ stage_unix() {
 	done
 	
 	# FreeBSD does not accept -i without argument in a way also acceptable by GNU sed
-	sed -i.tmp -e "s/~VER~/$VERSION/" "$DIST_ROOT/unix/$PV/easyrsa" || die "Cannot update easyrsa version"
+	sed -i.tmp -e "s/~VER~/$VERSION/" \
+		   -e "s/~DATE~/$(date)/" \
+		   -e "s/~HOST~/$(hostname -s)/" \
+		   -e "s/~GITHEAD~/$(git rev-parse HEAD)/" \
+		   "$DIST_ROOT/unix/$PV/easyrsa" || die "Cannot update easyrsa version data"
 	rm -f "$DIST_ROOT/unix/$PV/easyrsa.tmp"
 
 	# files not included
@@ -116,6 +120,13 @@ stage_win() {
 			cp -R "$SRC_ROOT/distro/windows/$f" "$DIST_ROOT/$win/$PV/" || die "failed to copy $f"
 			unix2dos "$DIST_ROOT/$win/$PV/$f" || die "unix2dos conversion failed for $f"
 		done
+	
+		sed -i.tmp -e "s/~VER~/$VERSION/" \
+			   -e "s/~DATE~/$(date)/" \
+			   -e "s/~HOST~/$(hostname -s)/" \
+			   -e "s/~GITHEAD~/$(git rev-parse HEAD)/" \
+			   "$DIST_ROOT/$win/$PV/easyrsa" || die "Cannot update easyrsa version data"
+		rm -f "$DIST_ROOT/$win/$PV/easyrsa.tmp"
 		
 		# files not included
 		rm -rf "$DIST_ROOT/$win/$PV/doc/TODO" || die "failed rm TODO"

easyrsa3/easyrsa

@@ -221,6 +221,7 @@ General options:
 --passout=ARG   : set -passout ARG for openssl
 --pki-dir=DIR   : declares the PKI directory
 --vars=FILE     : define a specific 'vars' file to use for Easy-RSA config
+--version       : prints EasyRSA version and build information, then exits
 
 Certificate & Request options: (these impact cert/req field values)
 
@@ -2319,6 +2320,18 @@ return 0
 
 } # => up23_manage_upgrade_23 ()
 
+print_version()
+{
+		cat <<HERE
+EasyRSA Version Information
+Version:     ~VER~
+Generated:   ~DATE~
+SSL Lib:     $(openssl version)
+Git Commit:  ~GITHEAD~
+Source Repo: https://github.com/OpenVPN/easy-rsa
+HERE
+		exit 0
+} # => print_version ()
 
 
 ########################################
@@ -2398,6 +2411,9 @@ while :; do
 		export EASYRSA_EXTRA_EXTS="\
 $EASYRSA_EXTRA_EXTS
 subjectAltName = $val" ;;
+	--version)
+		print_version
+		;;
 	*)
 		break ;;
 	esac
@@ -2498,6 +2514,9 @@ case "$cmd" in
 		cmd_help "$1"
 		exit 0
 		;;
+	version)
+		print_version
+		;;
 	*)
 		die "Unknown command '$cmd'. Run without commands for usage help."
 		;;