tools: add configure option for libfsimage

The only in-tree user of libfsimage is pygrub. Now that it is possible
to disable the build of pygrub, the same should be possible for
libfsimage.

Add an option for controlling the build of libfsimage. The default is
on if pygrub is being built, and off if it isn't. Without pygrub the
build of libfsimage can be enabled via --enable-libfsimage.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>

tools/configure

@@ -700,6 +700,7 @@ EXTRA_QEMUU_CONFIGURE_ARGS
 qemu_xen_systemd
 qemu_xen_path
 qemu_xen
+libfsimage
 rombios
 BCC
 LD86
@@ -818,6 +819,7 @@ enable_qemu_traditional
 enable_ipxe
 with_system_ipxe
 enable_rombios
+enable_libfsimage
 with_system_qemu
 with_stubdom_qmp_proxy
 with_system_seabios
@@ -1508,6 +1510,8 @@ Optional Features:
                           --with-system-ipxe)
   --enable-rombios        Enable ROMBIOS, (DEFAULT is on if qemu-traditional
                           or ipxe is enabled, otherwise off)
+  --enable-libfsimage     Enable libfsimage, (DEFAULT is on if pygrub is
+                          enabled, otherwise off)
   --enable-systemd        Enable systemd support (default is DISABLED)
   --enable-9pfs           Explicitly enable 9pfs support in QEMU build
                           (default is to defer to QEMU configure default)
@@ -4629,6 +4633,42 @@ $as_echo "#define HAVE_PYGRUB 1" >>confdefs.h
 
 fi
 
+# Check whether --enable-libfsimage was given.
+if test "${enable_libfsimage+set}" = set; then :
+  enableval=$enable_libfsimage;
+else
+
+    if test "x$pygrub" = "xn"; then :
+
+        enable_libfsimage="no"
+
+else
+
+        enable_libfsimage="yes"
+
+fi
+
+fi
+
+if test "x$enable_libfsimage" = "xyes"; then :
+
+    libfsimage=y
+
+else
+
+    if test "x$pygrub" = "xy"; then :
+
+        as_fn_error $? "pygrub needs libfsimage" "$LINENO" 5
+
+else
+
+        libfsimage=n
+
+fi
+
+fi
+
+
 
 # Check whether --with-system-qemu was given.
 if test "${with_system_qemu+set}" = set; then :