daemon: Use pkg-config to locate Augeas CFLAGS / libraries.

Augeas 0.10 depends on libxml2, so this is now required in the
appliance (in fact, it was already present).

However this exposed two bugs:

(1) In libguestfs we use a home-brewed recipe for Augeas flags,
resulting in this error:
/usr/include/augeas.h:24:25: fatal error: libxml/tree.h: No such file or directory

(2) Augeas's own augeas.pc didn't include the libxml2 flags, so
it was broken.  This requires a patch to Augeas 0.10, see:
https://www.redhat.com/archives/augeas-devel/2011-December/msg00008.html

Change to using pkg-config to detect Augeas.  It is still an optional
library.

Cherry picked from commit 615924abaa968398d6529529fa2f31ae23de825b and
rebased for old libguestfs branches that had separate
daemon/configure.ac.

diff --git a/appliance/packagelist.in b/appliance/packagelist.in
index 05afa94..7e15737 100644 (file)
--- a/appliance/packagelist.in
+++ b/appliance/packagelist.in
@@ -104,6 +104,7 @@ gawk
 grep
 gzip
 jfsutils
+libxml2
 lsof
 lvm2
 module-init-tools

diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index 8fb070f..1cfb9b7 100644 (file)
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -165,6 +165,7 @@ guestfsd_SOURCES = \
 guestfsd_LDADD = \
        liberrnostring.a \
        libprotocol.a \
+       $(AUGEAS_LIBS) \
        lib/libgnu.a \
        $(GETADDRINFO_LIB) \
        $(HOSTENT_LIB) \
@@ -175,4 +176,4 @@ guestfsd_LDADD = \
        $(SERVENT_LIB)
 
 AM_CPPFLAGS = -I$(srcdir)/lib -Ilib
-guestfsd_CFLAGS = $(WARN_CFLAGS) $(WERROR_CFLAGS)
+guestfsd_CFLAGS = $(WARN_CFLAGS) $(WERROR_CFLAGS) $(AUGEAS_CFLAGS)

diff --git a/daemon/configure.ac b/daemon/configure.ac
index e5eb89b..39aae75 100644 (file)
--- a/daemon/configure.ac
+++ b/daemon/configure.ac
@@ -144,16 +144,19 @@ AC_CHECK_PROG([GPERF],[gperf],[gperf],[no])
 test "x$GPERF" = "xno" &&
      AC_MSG_ERROR([gperf must be installed])
 
-dnl Check for Augeas (now optional).
-AC_CHECK_LIB([augeas],[aug_match],[
-        LIBS="-laugeas $LIBS"
-        have_augeas=yes
-        dnl Check for functions not available in earlier versions of Augeas.
-        AC_CHECK_FUNCS([aug_load aug_defvar aug_defnode])
-        ],[have_augeas=no])
-if test "x$have_augeas" = "xyes"; then
-        AC_DEFINE([HAVE_AUGEAS],[1],[Define to 1 if you have Augeas])
-fi
+dnl Check for Augeas (optional).
+PKG_CHECK_MODULES([AUGEAS], [augeas],
+        [AC_SUBST([AUGEAS_CFLAGS])
+         AC_SUBST([AUGEAS_LIBS])
+         AC_DEFINE([HAVE_AUGEAS],[1],[Define to 1 if you have Augeas])
+
+         old_LIBS="$LIBS"
+         LIBS="$LIBS $AUGEAS_LIBS"
+         dnl Check for functions not available in earlier versions of Augeas.
+         AC_CHECK_FUNCS([aug_load aug_defvar aug_defnode])
+         LIBS="$old_LIBS"
+        ],
+        [AC_MSG_WARN([augeas not found, some core features will be disabled])])
 
 dnl Check for libselinux (optional).
 AC_CHECK_HEADERS([selinux/selinux.h])