xl: Add basic bash completion for xl command.

Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>

Config.mk

@@ -29,6 +29,7 @@ include $(XEN_ROOT)/config/$(XEN_TARGET_ARCH).mk
 SHAREDIR    ?= $(PREFIX)/share
 DOCDIR      ?= $(SHAREDIR)/doc/xen
 MANDIR      ?= $(SHAREDIR)/man
+BASH_COMPLETION_DIR ?= /etc/profile.d
 
 ifneq ($(EXTRA_PREFIX),)
 EXTRA_INCLUDES += $(EXTRA_PREFIX)/include

tools/libxl/Makefile

@@ -100,6 +100,7 @@ install: all
 	ln -sf libxlutil.so.$(XLUMAJOR) $(DESTDIR)$(LIBDIR)/libxlutil.so
 	$(INSTALL_DATA) libxlutil.a $(DESTDIR)$(LIBDIR)
 	$(INSTALL_DATA) libxl.h $(DESTDIR)$(INCLUDEDIR)
+	$(INSTALL_DATA) bash-completion $(BASH_COMPLETION_DIR)/xl.sh
 
 .PHONY: clean
 clean:

tools/libxl/bash-completion

@@ -0,0 +1,21 @@
+#!/bin/bash
+# Copy this file to /etc/profile.d/xl.sh
+
+_xl()
+{
+	local IFS=$'\n,'
+
+	local cur opts xl
+	COMPREPLY=()
+	cur="${COMP_WORDS[COMP_CWORD]}"
+	xl=xl
+	
+	if [[ $COMP_CWORD == 1 ]] ; then
+		opts=`${xl} help 2>/dev/null | sed 'n;d' | sed '1,2d' | awk '{print $1}' | sed 's/$/ ,/g'` && COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
+		return 0
+	fi
+
+	return 0
+}
+
+complete -F _xl -o nospace -o default xl