[Qemu-devel] [PATCH v4 05/10] qemu-ga: Add configure options to specify path to Windows/VSS SDK

[Tomoki Sekiyama <tomoki.sekiyama@hds.com>]

To enable VSS support in qemu-ga for Windows, header files included in
VSS SDK are required.
The VSS support is enabled by the configure option like below:
  ./configure --with-vss-sdk="/path/to/VSS SDK"

If the path is omitted, it tries to search the headers from default paths
and VSS support is enabled only if the SDK is found.
VSS support is disabled if --without-vss-sdk or --with-vss-sdk=no is
specified.

VSS SDK is available from:
  http://www.microsoft.com/en-us/download/details.aspx?id=23490

To cross-compile using mingw, you need to setup the SDK on Windows
environments to extract headers. You can also extract the SDK headers on
POSIX environments using scripts/extract-vss-headers and msitools.

In addition, --with-win-sdk="/path/to/Windows SDK" option is also added to
specify path to Windows SDK, which may be used for native-compile of .tlb
file of qemu-ga VSS provider. However, this is usually unnecessary because
pre-compiled .tlb file is included.

Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
---
 .gitignore |    1 +
 Makefile   |    1 +
 configure  |   69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+)

diff --git a/.gitignore b/.gitignore
index 64e9466..67facd3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -79,6 +79,7 @@ fsdev/virtfs-proxy-helper.pod
 *.la
 *.pc
 .libs
+.sdk
 *.swp
 *.orig
 .pc
diff --git a/Makefile b/Makefile
index a96736b..4851ba0 100644
--- a/Makefile
+++ b/Makefile
@@ -272,6 +272,7 @@ distclean: clean
 	for d in $(TARGET_DIRS); do \
 	rm -rf $$d || exit 1 ; \
         done
+	rm -Rf .sdk
 	if test -f pixman/config.log; then make -C pixman distclean; fi
 	if test -f dtc/version_gen.h; then make $(DTC_MAKE_ARGS) clean; fi
 
diff --git a/configure b/configure
index a2fc3f3..cafe830 100755
--- a/configure
+++ b/configure
@@ -232,6 +232,8 @@ usb_redir=""
 glx=""
 zlib="yes"
 guest_agent="yes"
+guest_agent_with_vss="no"
+vss_win32_sdk=""
 want_tools="yes"
 libiscsi=""
 coroutine=""
@@ -919,6 +921,14 @@ for opt do
   ;;
   --disable-guest-agent) guest_agent="no"
   ;;
+  --with-vss-sdk) vss_win32_sdk=""
+  ;;
+  --with-vss-sdk=*) vss_win32_sdk="$optarg"
+  ;;
+  --without-vss-sdk) vss_win32_sdk="no"
+  ;;
+  --with-win-sdk=*) win_sdk="$optarg"
+  ;;
   --enable-tools) want_tools="yes"
   ;;
   --disable-tools) want_tools="no"
@@ -1151,6 +1161,8 @@ echo "  --disable-usb-redir      disable usb network redirection support"
 echo "  --enable-usb-redir       enable usb network redirection support"
 echo "  --disable-guest-agent    disable building of the QEMU Guest Agent"
 echo "  --enable-guest-agent     enable building of the QEMU Guest Agent"
+echo "  --with-vss-sdk=SDK-path  enable Windows VSS support in QEMU Guest Agent"
+echo "  --with-win-sdk=SDK-path  path to Windows Platform SDK (to build VSS .tlb)"
 echo "  --disable-seccomp        disable seccomp support"
 echo "  --enable-seccomp         enables seccomp support"
 echo "  --with-coroutine=BACKEND coroutine backend. Supported options:"
@@ -3066,6 +3078,57 @@ if test "$usb_redir" != "no" ; then
 fi
 
 ##########################################
+# check if we have VSS SDK headers for win
+
+if test "$mingw32" = "yes" -a "$guest_agent" = "yes" -a "$vss_win32_sdk" != "no" ; then
+  case "$vss_win32_sdk" in
+    "")   vss_win32_include="-I$source_path" ;;
+    *\ *) # The SDK is installed in "Program Files" by default, but we cannot
+          # handle path with spaces. So we symlink the headers into ".sdk/vss".
+          vss_win32_include="-I$source_path/.sdk/vss"
+	  symlink "$vss_win32_sdk/inc" "$source_path/.sdk/vss/inc"
+	  ;;
+    *)    vss_win32_include="-I$vss_win32_sdk"
+  esac
+  cat > $TMPC << EOF
+#define __MIDL_user_allocate_free_DEFINED__
+#include <inc/win2003/vss.h>
+int main(void) { return VSS_CTX_BACKUP; }
+EOF
+  if compile_prog "$vss_win32_include" "" ; then
+    guest_agent_with_vss="yes"
+    QEMU_CFLAGS="$QEMU_CFLAGS $vss_win32_include"
+    libs_qga="-lole32 -loleaut32 -lshlwapi -luuid -lstdc++ -Wl,--enable-stdcall-fixup $libs_qga"
+  else
+    if test "$vss_win32_sdk" != "" ; then
+      echo "ERROR: Please download and install Microsoft VSS SDK:"
+      echo "ERROR:   http://www.microsoft.com/en-us/download/details.aspx?id=23490"
+      echo "ERROR: On POSIX-systems, you can extract the SDK headers by:"
+      echo "ERROR:   scripts/extract-vsssdk-headers setup.exe"
+      echo "ERROR: The headers are extracted in the directory \`inc'."
+      feature_not_found "VSS support"
+    fi
+    guest_agent_with_vss="no"
+  fi
+fi
+
+##########################################
+# lookup Windows platform SDK (if not specified)
+# The SDK is needed only to build .tlb (type library) file of guest agent
+# VSS provider from the source. It is usually unnecessary because the
+# pre-compiled .tlb file is included.
+
+if test "$mingw32" = "yes" -a "$guest_agent" = "yes" -a "$guest_agent_with_vss" = "yes" ; then
+  if test -z "$win_sdk"; then
+    programfiles="$PROGRAMFILES"
+    test -n "$PROGRAMW6432" && programfiles="$PROGRAMW6432"
+    if test -n "$programfiles"; then
+      win_sdk=$(ls -d "$programfiles/Microsoft SDKs/Windows/v"* | tail -1) 2>/dev/null
+    fi
+  fi
+fi
+
+##########################################
 
 ##########################################
 # check if we have fdatasync
@@ -3466,6 +3529,7 @@ echo "Manual directory  `eval echo $mandir`"
 echo "ELF interp prefix $interp_prefix"
 else
 echo "local state directory   queried at runtime"
+echo "Windows SDK       $win_sdk"
 fi
 echo "Source path       $source_path"
 echo "C compiler        $cc"
@@ -3552,6 +3616,7 @@ echo "usb net redir     $usb_redir"
 echo "GLX support       $glx"
 echo "libiscsi support  $libiscsi"
 echo "build guest agent $guest_agent"
+echo "QGA VSS support   $guest_agent_with_vss"
 echo "seccomp support   $seccomp"
 echo "coroutine backend $coroutine"
 echo "GlusterFS support $glusterfs"
@@ -3627,6 +3692,10 @@ if test "$mingw32" = "yes" ; then
   version_micro=0
   echo "CONFIG_FILEVERSION=$version_major,$version_minor,$version_subminor,$version_micro" >> $config_host_mak
   echo "CONFIG_PRODUCTVERSION=$version_major,$version_minor,$version_subminor,$version_micro" >> $config_host_mak
+  if test "$guest_agent_with_vss" = "yes" ; then
+    echo "CONFIG_QGA_VSS=y" >> $config_host_mak
+    echo "WIN_SDK=\"$win_sdk\"" >> $config_host_mak
+  fi
 else
   echo "CONFIG_POSIX=y" >> $config_host_mak
 fi