Autodetect usbredir and PolicyKit by default

Currently, usb redirection and policykit are enabled by default,
and configure will error out if the required dependencies cannot
be found. This commit changes the default behaviour, by default
usb redirection/policykit support is automatically enabled/disabled
depending on the availability of the needed dependencies. Passing
--enable-usbredir will error out if the dependencies for usb
redirection cannot be found, ditto for policykit. This should make
things nicer for people running configure or autogen.sh with no
argument.

1 files changed, 45 insertions, 28 deletions

diff --git a/configure.ac b/configure.ac
index d7dd1c0..202aa3c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -314,43 +314,60 @@ else
 fi
 
 AC_ARG_ENABLE([usbredir],
-  AS_HELP_STRING([--enable-usbredir=@<:@yes/no@:>@],
-                 [Enable usbredir support @<:@default=yes@:>@]),
+  AS_HELP_STRING([--enable-usbredir=@<:@auto/yes/no@:>@],
+                 [Enable usbredir support @<:@default=auto@:>@]),
   [],
-  [enable_usbredir="yes"])
-AC_ARG_ENABLE([polkit],
-  AS_HELP_STRING([--enable-polkit=@<:@yes/no@:>@],
-                 [Enable policykit support (for the usb acl helper)@<:@default=yes@:>@]),
-  [],
-  [enable_polkit="yes"])
+  [enable_usbredir="auto"])
 
 if test "x$enable_usbredir" = "xno"; then
   AM_CONDITIONAL(WITH_USBREDIR, false)
   AM_CONDITIONAL(WITH_POLKIT, false)
 else
-  PKG_CHECK_MODULES(GUDEV, gudev-1.0)
-  PKG_CHECK_MODULES(LIBUSB, libusb-1.0 >= 1.0.9)
-  PKG_CHECK_MODULES(LIBUSBREDIRHOST, libusbredirhost >= 0.3.3)
-  AC_DEFINE(USE_USBREDIR, [1], [Define if supporting usbredir proxying])
-  AM_CONDITIONAL(WITH_USBREDIR, true)
-  if test "x$enable_polkit" = "xno"; then
-    AM_CONDITIONAL(WITH_POLKIT, false)
-  else
-    PKG_CHECK_MODULES(POLKIT, polkit-gobject-1 >= 0.96)
-    AC_CHECK_HEADER([acl/libacl.h],,
-                    AC_MSG_ERROR([cannot find headers for libacl]))
-    AC_CHECK_LIB([acl], [acl_get_file], [ACL_LIBS=-lacl] [AC_SUBST(ACL_LIBS)],
-                 AC_MSG_ERROR([cannot find libacl]))
+  PKG_CHECK_MODULES([USBREDIR],
+                    [gudev-1.0 libusb-1.0 >= 1.0.9 libusbredirhost >= 0.3.3],
+                    [have_usbredir=yes],
+                    [have_usbredir=no])
+  if test x"$have_usbredir" = "xno" && test x"$enable_usbredir" = "xyes"; then
+    AC_MSG_ERROR([usbredir support explicitly requested, but some required packages are not available])
+  fi
+  if test x"$have_usbredir" = "xyes"; then
+    AC_DEFINE(USE_USBREDIR, [1], [Define if supporting usbredir proxying])
+  fi
+  AM_CONDITIONAL([WITH_USBREDIR], [test x"$have_usbredir" = "xyes"])
+fi
+
+AC_ARG_ENABLE([polkit],
+  AS_HELP_STRING([--enable-polkit=@<:@yes/no@:>@],
+                 [Enable policykit support (for the usb acl helper)@<:@default=yes@:>@]),
+  [],
+  [enable_polkit="auto"])
+
+if test x"$have_usbredir" = "xyes" && test "x$enable_polkit" != "xno"; then
+  have_polkit=yes
+  PKG_CHECK_MODULES([POLKIT], [polkit-gobject-1 >= 0.96],
+                              [],
+                              [have_polkit=no])
+  AC_CHECK_HEADER([acl/libacl.h], [], [have_polkit=no])
+  AC_CHECK_LIB([acl], [acl_get_file], [ACL_LIBS=-lacl], [have_polkit=no])
+  if test x"$enable_polkit" = "xyes" && test x"$have_polkit" = "xno"; then
+    AC_MSG_ERROR([PolicyKit support explicitly requested, but some required packages are not available])
+  fi
+
+  if test x"$have_polkit" = "xyes"; then
+    AC_SUBST(ACL_LIBS)
     AC_DEFINE(USE_POLKIT, [1], [Define if supporting polkit])
-    AM_CONDITIONAL(WITH_POLKIT, true)
-    POLICYDIR=`${PKG_CONFIG} polkit-gobject-1 --variable=policydir`
-    AC_SUBST(POLICYDIR)
-    # Check for polkit_authority_get_sync()
-    AC_CHECK_LIB([polkit-gobject-1], [polkit_authority_get_sync], ac_have_pk_auth_get_sync="1", ac_have_pk_auth_get_sync="0")
-    AC_DEFINE_UNQUOTED(HAVE_POLKIT_AUTHORITY_GET_SYNC, $ac_have_pk_auth_get_sync, [Define if you have a polkit with polkit_authority_get_sync()])
   fi
+  AM_CONDITIONAL([WITH_POLKIT], [test x"$have_polkit" = "xyes"])
+  POLICYDIR=`${PKG_CONFIG} polkit-gobject-1 --variable=policydir`
+  AC_SUBST(POLICYDIR)
+  # Check for polkit_authority_get_sync()
+  AC_CHECK_LIB([polkit-gobject-1], [polkit_authority_get_sync], ac_have_pk_auth_get_sync="1", ac_have_pk_auth_get_sync="0")
+  AC_DEFINE_UNQUOTED(HAVE_POLKIT_AUTHORITY_GET_SYNC, $ac_have_pk_auth_get_sync, [Define if you have a polkit with polkit_authority_get_sync()])
+else
+  AM_CONDITIONAL(WITH_POLKIT, false)
 fi
 
+
 AC_ARG_WITH([usb-acl-helper-dir],
   AS_HELP_STRING([--with-usb-acl-helper-dir=DIR],
                  [Directory where the USB ACL helper binary should be installed]),
@@ -598,7 +615,7 @@ AC_MSG_NOTICE([
         Target:                   ${red_target}
         SASL support:             ${enable_sasl}
         Smartcard support:        ${enable_smartcard}
-        USB redirection support:  ${enable_usbredir}
+        USB redirection support:  ${have_usbredir}
         Gtk:                      $GTK_API_VERSION
 
         Now type 'make' to build $PACKAGE