[Libguestfs] [PATCH 3/3] nbdkit: add a --without-linuxdisk configure argument

[asomers at gmail.com]

From: Alan Somers <asomers at gmail.com>

This can be used to disable the linuxdisk plugin, which otherwise is
always built if a suitable mke2fs command is present.
---
 configure.ac | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index f24c3734..c93e822b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -483,18 +483,25 @@ AS_IF([test "$GNUTLS_LIBS" != ""],[
     LIBS="$old_LIBS"
 ])
 
+AC_ARG_WITH([linuxdisk],
+    [AS_HELP_STRING([--without-linuxdisk],
+                    [disable linuxdisk plugin @<:@default=check@:>@])],
+    [],
+    [with_linuxdisk=check])
 dnl Check for mke2fs -d (used by linuxdisk plugin).  There are two
 dnl possible outcomes that we care about: (1) We have mke2fs and
 dnl it supports the -d option.  (2) We either don't have mke2fs
 dnl or it's too old to support the -d option (eg. on RHEL 7).
 mke2fs_with_d=no
-AC_MSG_CHECKING([for mke2fs supporting the -d option])
-AS_IF([mke2fs -V >/dev/null 2>&1], [
-    AS_IF([LANG=C mke2fs -d 2>&1 | grep -sq "option requires an argument"], [
-        mke2fs_with_d=yes
+AS_IF([test "$with_linuxdisk" != "no"], [
+    AC_MSG_CHECKING([for mke2fs supporting the -d option])
+    AS_IF([mke2fs -V >/dev/null 2>&1], [
+        AS_IF([LANG=C mke2fs -d 2>&1 | grep -sq "option requires an argument"], [
+            mke2fs_with_d=yes
+        ])
     ])
+    AC_MSG_RESULT([$mke2fs_with_d])
 ])
-AC_MSG_RESULT([$mke2fs_with_d])
 AM_CONDITIONAL([HAVE_MKE2FS_WITH_D],[test "x$mke2fs_with_d" = "xyes"])
 
 dnl Check for valgrind.
-- 
2.26.2