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[Xen-changelog] [xen-unstable] Get rid of hardcoded pathes for stubdom and hotplug scripts



# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1245774351 -3600
# Node ID 4155051393333941af13d6e0c637824e5e2db841
# Parent  b7f73a7f30789c83b6f41c2bf4e485aeb5c09bfa
Get rid of hardcoded pathes for stubdom and hotplug scripts

- Have the buid system generate a file which exports the install paths
   for the hotplug scripts and stubdom / stubdom-dm
- Move file generation code from tools/python/Makefile into a gmake
   macro
  in Config.mk to avoid maintenance of three duplicates each with its
   own
  tweaks and bugs
- Export gmake variables into ioemu as shell variables
  for upcoming ioemu patches
- Do above as a gmake macro to avoid maintenance of several duplicates
- Adjust hotplug scripts to find the right xen binaries from the
  install directory
- Adjust stubdom-dm to use the install directories

Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx>
---
 Config.mk                                 |   22 +++++++++++++++++++++
 stubdom/Makefile                          |   10 ++++++---
 stubdom/stubdom-dm                        |   31 ++++++++++++++++--------------
 tools/Makefile                            |    6 +----
 tools/hotplug/Linux/block                 |    4 +--
 tools/hotplug/Linux/network-bridge        |    2 -
 tools/hotplug/Linux/network-nat           |    3 +-
 tools/hotplug/Linux/network-route         |    3 +-
 tools/hotplug/Linux/vif-bridge            |    6 ++---
 tools/hotplug/Linux/vif-nat               |    6 ++---
 tools/hotplug/Linux/vif-route             |    6 ++---
 tools/hotplug/Linux/xen-hotplug-cleanup   |    2 -
 tools/hotplug/Linux/xen-hotplug-common.sh |    3 +-
 tools/hotplug/NetBSD/block-nbsd           |    5 +++-
 tools/hotplug/NetBSD/vif-bridge-nbsd      |    5 +++-
 tools/hotplug/NetBSD/vif-ip-nbsd          |    5 +++-
 tools/hotplug/common/Makefile             |   16 ++++++++++-----
 tools/python/Makefile                     |   17 +++-------------
 18 files changed, 94 insertions(+), 58 deletions(-)

diff -r b7f73a7f3078 -r 415505139333 Config.mk
--- a/Config.mk Tue Jun 23 17:24:14 2009 +0100
+++ b/Config.mk Tue Jun 23 17:25:51 2009 +0100
@@ -87,6 +87,28 @@ define absolutify_xen_root
     export XEN_ROOT
 endef
 
+define buildmakevars2shellvars
+    PREFIX="$(PREFIX)";                                            \
+    XEN_SCRIPT_DIR="$(XEN_SCRIPT_DIR)";                            \
+    export PREFIX;                                                 \
+    export XEN_SCRIPT_DIR
+endef
+
+buildmakevars2file = $(eval $(call buildmakevars2file-closure,$(1)))
+define buildmakevars2file-closure
+    .PHONY: genpath
+    genpath:
+       rm -f $(1);                                                    \
+       echo "SBINDIR=\"$(SBINDIR)\"" >> $(1);                         \
+       echo "BINDIR=\"$(BINDIR)\"" >> $(1);                           \
+       echo "LIBEXEC=\"$(LIBEXEC)\"" >> $(1);                         \
+       echo "LIBDIR=\"$(LIBDIR)\"" >> $(1);                           \
+       echo "PRIVATE_BINDIR=\"$(PRIVATE_BINDIR)\"" >> $(1);           \
+       echo "XENFIRMWAREDIR=\"$(XENFIRMWAREDIR)\"" >> $(1);           \
+       echo "XEN_CONFIG_DIR=\"$(XEN_CONFIG_DIR)\"" >> $(1);           \
+       echo "XEN_SCRIPT_DIR=\"$(XEN_SCRIPT_DIR)\"" >> $(1)
+endef
+
 ifeq ($(debug),y)
 CFLAGS += -g
 endif
diff -r b7f73a7f3078 -r 415505139333 stubdom/Makefile
--- a/stubdom/Makefile  Tue Jun 23 17:24:14 2009 +0100
+++ b/stubdom/Makefile  Tue Jun 23 17:25:51 2009 +0100
@@ -77,8 +77,12 @@ TARGET_LDFLAGS += -nostdlib -L$(CROSS_PR
 
 TARGETS=ioemu c caml grub
 
+STUBDOMPATH="stubdompath.sh"
+genpath-target = $(call buildmakevars2file,$(STUBDOMPATH))
+$(eval $(genpath-target))
+
 .PHONY: all
-all: build
+all: genpath build
 ifeq ($(STUBDOM_SUPPORTED),1)
 build: ioemu-stubdom c-stubdom pv-grub
 else
@@ -270,8 +274,7 @@ ioemu: cross-zlib cross-libpci libxc
 ioemu: cross-zlib cross-libpci libxc
        [ -f ioemu/config-host.mak ] || \
          ( $(absolutify_xen_root); \
-           PREFIX=$(PREFIX); \
-           export PREFIX; \
+           $(buildmakevars2shellvars); \
            cd ioemu ; \
            LWIPDIR=$(CURDIR)/lwip-$(XEN_TARGET_ARCH) \
            TARGET_CPPFLAGS="$(TARGET_CPPFLAGS)" \
@@ -374,6 +377,7 @@ clean:
        $(MAKE) -C caml clean
        $(MAKE) -C c clean
        rm -fr grub-$(XEN_TARGET_ARCH)
+       rm -f $(STUBDOMPATH)
        [ ! -d libxc-$(XEN_TARGET_ARCH) ] || $(MAKE) -C 
libxc-$(XEN_TARGET_ARCH) clean
        -[ ! -d ioemu ] || $(MAKE) -C ioemu clean
 
diff -r b7f73a7f3078 -r 415505139333 stubdom/stubdom-dm
--- a/stubdom/stubdom-dm        Tue Jun 23 17:24:14 2009 +0100
+++ b/stubdom/stubdom-dm        Tue Jun 23 17:25:51 2009 +0100
@@ -4,6 +4,9 @@
 #
 # dm script around stubdomains.
 #
+
+. ./stubdompath.sh
+stubdom_configdir="${XEN_CONFIG_DIR}/stubdoms"
 
 # To fit xterms nicely
 height=339
@@ -80,7 +83,7 @@ term() {
     (
        [ -n "$vncpid" ] && kill -9 $vncpid
        xm destroy $domname-dm
-        rm /etc/xen/stubdoms/$domname-dm
+        rm ${stubdom_configdir}/$domname-dm
     ) &
     # We need to exit immediately so as to let xend do the commands above
     exit 0
@@ -97,9 +100,9 @@ done
 done
 
 # Generate stubdom config file
-mkdir -p /etc/xen/stubdoms &>/dev/null
-echo "#This file is autogenerated, edit $domname instead!" > 
/etc/xen/stubdoms/$domname-dm
-echo "kernel = '/usr/lib/xen/boot/ioemu-stubdom.gz'" >> 
/etc/xen/stubdoms/$domname-dm
+mkdir -p ${stubdom_configdir} &>/dev/null
+echo "#This file is autogenerated, edit $domname instead!" > 
${stubdom_configdir}/$domname-dm
+echo "kernel = '${XENFIRMWAREDIR}/ioemu-stubdom.gz'" >> 
${stubdom_configdir}/$domname-dm
 
 vfb="sdl=$sdl, opengl=$opengl"
 test "$DISPLAY" && vfb="$vfb, display=$DISPLAY"
@@ -110,9 +113,9 @@ test "$keymap" && vfb="$vfb, keymap=$key
 test "$keymap" && vfb="$vfb, keymap=$keymap"
 test "$monitor" && vfb="$vfb, monitor=$monitor"
 test "$serial" && vfb="$vfb, serial=$serial"
-echo "vfb = ['$vfb']" >> /etc/xen/stubdoms/$domname-dm
+echo "vfb = ['$vfb']" >> ${stubdom_configdir}/$domname-dm
 
-echo -n "disk = [ " >> /etc/xen/stubdoms/$domname-dm
+echo -n "disk = [ " >> ${stubdom_configdir}/$domname-dm
 j=0
 for i in `xenstore-ls /local/domain/$domid/device/vbd | grep 'backend =' | awk 
'{print $3}'`
 do
@@ -126,13 +129,13 @@ do
     vbd_devtype=`xenstore-read $vbd_front/device-type`
     if [ $j -ne 0 ]
     then
-        echo -n "," >> /etc/xen/stubdoms/$domname-dm
+        echo -n "," >> ${stubdom_configdir}/$domname-dm
     fi
-    echo -n "'$vbd_type:$vbd_disk,$vbd_dev:$vbd_devtype,$vbd_mode'" >> 
/etc/xen/stubdoms/$domname-dm
+    echo -n "'$vbd_type:$vbd_disk,$vbd_dev:$vbd_devtype,$vbd_mode'" >> 
${stubdom_configdir}/$domname-dm
     j=$(( $j + 1 ))
 done
-echo " ] " >> /etc/xen/stubdoms/$domname-dm
-echo -n "vif = [ " >> /etc/xen/stubdoms/$domname-dm
+echo " ] " >> ${stubdom_configdir}/$domname-dm
+echo -n "vif = [ " >> ${stubdom_configdir}/$domname-dm
 j=0
 for i in `xenstore-ls /local/domain/$domid/device/vif | grep 'backend =' | awk 
'{print $3}'`
 do
@@ -141,13 +144,13 @@ do
     vif_mac=`xenstore-read $i/mac`
     if [ $j -ne 0 ]
     then
-        echo -n "," >> /etc/xen/stubdoms/$domname-dm
+        echo -n "," >> ${stubdom_configdir}/$domname-dm
     fi
-    echo -n "'mac=$vif_mac'" >> /etc/xen/stubdoms/$domname-dm
+    echo -n "'mac=$vif_mac'" >> ${stubdom_configdir}/$domname-dm
     j=$(( $j + 1 ))
 done
-echo " ] " >> /etc/xen/stubdoms/$domname-dm
-creation="xm create -c /etc/xen/stubdoms/$domname-dm target=$domid memory=32 
extra=\"$extra\""
+echo " ] " >> ${stubdom_configdir}/$domname-dm
+creation="xm create -c ${stubdom_configdir}/$domname-dm target=$domid 
memory=32 extra=\"$extra\""
 
 (while true ; do sleep 60 ; done) | /bin/sh -c "$creation" &
 #xterm -geometry +0+0 -e /bin/sh -c "$creation ; echo ; echo press ENTER to 
shut down ; read" &
diff -r b7f73a7f3078 -r 415505139333 tools/Makefile
--- a/tools/Makefile    Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/Makefile    Tue Jun 23 17:25:51 2009 +0100
@@ -97,10 +97,7 @@ ioemu-dir-find:
        fi
        set -e; \
                $(absolutify_xen_root); \
-               PREFIX=$(PREFIX); \
-               XEN_SCRIPT_DIR=$(XEN_SCRIPT_DIR); \
-               export PREFIX; \
-               export XEN_SCRIPT_DIR; \
+               $(buildmakevars2shellvars); \
                cd ioemu-dir; \
                ./xen-setup $(IOEMU_CONFIGURE_CROSS)
 
@@ -109,6 +106,7 @@ subdir-clean-ioemu-dir:
 subdir-clean-ioemu-dir:
        set -e; if test -d ioemu-dir/.; then \
                $(absolutify_xen_root); \
+               $(buildmakevars2shellvars); \
                $(MAKE) -C ioemu-dir clean; \
        fi
 
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/Linux/block
--- a/tools/hotplug/Linux/block Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/Linux/block Tue Jun 23 17:25:51 2009 +0100
@@ -377,5 +377,5 @@ esac
 esac
 
 # If we've reached here, $t is neither phy nor file, so fire a helper script.
-[ -x /etc/xen/scripts/block-"$t" ] && \
-  /etc/xen/scripts/block-"$t" "$command" $node
+[ -x ${XEN_SCRIPT_DIR}/block-"$t" ] && \
+  ${XEN_SCRIPT_DIR}/block-"$t" "$command" $node
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/Linux/network-bridge
--- a/tools/hotplug/Linux/network-bridge        Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/Linux/network-bridge        Tue Jun 23 17:25:51 2009 +0100
@@ -2,7 +2,7 @@
 #============================================================================
 # Default Xen network start/stop script.
 # Xend calls a network script when it starts.
-# The script name to use is defined in /etc/xen/xend-config.sxp
+# The script name to use is defined in ${XEN_CONFIG_DIR}/xend-config.sxp
 # in the network-script field.
 #
 # This script creates a bridge (default ${netdev}), adds a device
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/Linux/network-nat
--- a/tools/hotplug/Linux/network-nat   Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/Linux/network-nat   Tue Jun 23 17:25:51 2009 +0100
@@ -2,7 +2,7 @@
 #============================================================================
 # Default Xen network start/stop script when using NAT.
 # Xend calls a network script when it starts.
-# The script name to use is defined in /etc/xen/xend-config.sxp
+# The script name to use is defined in ${XEN_CONFIG_DIR}/xend-config.sxp
 # in the network-script field.
 #
 # Usage:
@@ -18,6 +18,7 @@
 #============================================================================
 
 dir=$(dirname "$0")
+. "$dir/hotplugpath.sh"
 . "$dir/xen-script-common.sh"
 . "$dir/xen-network-common.sh"
 
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/Linux/network-route
--- a/tools/hotplug/Linux/network-route Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/Linux/network-route Tue Jun 23 17:25:51 2009 +0100
@@ -2,7 +2,7 @@
 #============================================================================
 # Default Xen network start/stop script.
 # Xend calls a network script when it starts.
-# The script name to use is defined in /etc/xen/xend-config.sxp
+# The script name to use is defined in ${XEN_CONFIG_DIR}/xend-config.sxp
 # in the network-script field.
 #
 # Usage:
@@ -17,6 +17,7 @@
 #============================================================================
 
 dir=$(dirname "$0")
+. "$dir/hotplugpath.sh"
 . "$dir/xen-script-common.sh"
 
 evalVariables "$@"
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/Linux/vif-bridge
--- a/tools/hotplug/Linux/vif-bridge    Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/Linux/vif-bridge    Tue Jun 23 17:25:51 2009 +0100
@@ -1,12 +1,12 @@
 #!/bin/bash
 #============================================================================
-# /etc/xen/vif-bridge
+# ${XEN_SCRIPT_DIR}/vif-bridge
 #
 # Script for configuring a vif in bridged mode.
 # The hotplugging system will call this script if it is specified either in
 # the device configuration given to Xend, or the default Xend configuration
-# in /etc/xen/xend-config.sxp.  If the script is specified in neither of those
-# places, then this script is the default.
+# in ${XEN_CONFIG_DIR}/xend-config.sxp.  If the script is specified in
+# neither of those places, then this script is the default.
 #
 # Usage:
 # vif-bridge (add|remove|online|offline)
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/Linux/vif-nat
--- a/tools/hotplug/Linux/vif-nat       Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/Linux/vif-nat       Tue Jun 23 17:25:51 2009 +0100
@@ -1,12 +1,12 @@
 #!/bin/bash
 #============================================================================
-# /etc/xen/vif-nat
+# ${XEN_SCRIPT_DIR}/vif-nat
 #
 # Script for configuring a vif in routed-nat mode.
 # The hotplugging system will call this script if it is specified either in
 # the device configuration given to Xend, or the default Xend configuration
-# in /etc/xen/xend-config.sxp.  If the script is specified in neither of those
-# places, then vif-bridge is the default.
+# in ${XEN_CONFIG_DIR}/xend-config.sxp.  If the script is specified in
+# neither of those places, then vif-bridge is the default.
 #
 # Usage:
 # vif-nat (add|remove|online|offline)
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/Linux/vif-route
--- a/tools/hotplug/Linux/vif-route     Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/Linux/vif-route     Tue Jun 23 17:25:51 2009 +0100
@@ -1,12 +1,12 @@
 #!/bin/bash
 #============================================================================
-# /etc/xen/vif-route
+# ${XEN_SCRIPT_DIR}/vif-route
 #
 # Script for configuring a vif in routed mode.
 # The hotplugging system will call this script if it is specified either in
 # the device configuration given to Xend, or the default Xend configuration
-# in /etc/xen/xend-config.sxp.  If the script is specified in neither of those
-# places, then vif-bridge is the default.
+# in ${XEN_CONFIG_DIR}/xend-config.sxp.  If the script is specified in
+# neither of those places, then vif-bridge is the default.
 #
 # Usage:
 # vif-route (add|remove|online|offline)
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/Linux/xen-hotplug-cleanup
--- a/tools/hotplug/Linux/xen-hotplug-cleanup   Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/Linux/xen-hotplug-cleanup   Tue Jun 23 17:25:51 2009 +0100
@@ -3,7 +3,7 @@ dir=$(dirname "$0")
 dir=$(dirname "$0")
 . "$dir/xen-hotplug-common.sh"
 
-# Claim the lock protecting /etc/xen/scripts/block.  This stops a race whereby
+# Claim the lock protecting ${XEN_SCRIPT_DIR}/block.  This stops a race whereby
 # paths in the store would disappear underneath that script as it attempted to
 # read from the store checking for device sharing.
 # Any other scripts that do similar things will have to have their lock
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/Linux/xen-hotplug-common.sh
--- a/tools/hotplug/Linux/xen-hotplug-common.sh Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/Linux/xen-hotplug-common.sh Tue Jun 23 17:25:51 2009 +0100
@@ -17,13 +17,14 @@
 
 
 dir=$(dirname "$0")
+. "$dir/hotplugpath.sh"
 . "$dir/logging.sh"
 . "$dir/xen-script-common.sh"
 . "$dir/locking.sh"
 
 exec 2>>/var/log/xen/xen-hotplug.log
 
-export PATH="/sbin:/bin:/usr/bin:/usr/sbin:$PATH"
+export 
PATH="${BINDIR}:${SBINDIR}:${LIBEXEC}:${PRIVATE_BINDIR}:/sbin:/bin:/usr/bin:/usr/sbin:$PATH"
 export LANG="POSIX"
 unset $(set | grep ^LC_ | cut -d= -f1)
 
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/NetBSD/block-nbsd
--- a/tools/hotplug/NetBSD/block-nbsd   Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/NetBSD/block-nbsd   Tue Jun 23 17:25:51 2009 +0100
@@ -4,7 +4,10 @@
 # Called by xenbackendd
 # Usage: block xsdir_backend_path state
 
-PATH=/bin:/usr/bin:/sbin:/usr/sbin
+DIR=$(dirname "$0")
+. "${DIR}/hotplugpath.sh"
+
+PATH=${BINDIR}:${SBINDIR}:${LIBEXEC}:${PRIVATE_BINDIR}:/bin:/usr/bin:/sbin:/usr/sbin
 export PATH
 
 error() {
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/NetBSD/vif-bridge-nbsd
--- a/tools/hotplug/NetBSD/vif-bridge-nbsd      Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/NetBSD/vif-bridge-nbsd      Tue Jun 23 17:25:51 2009 +0100
@@ -4,7 +4,10 @@
 # Called by xenbackendd
 # Usage: vif-bridge xsdir_backend_path state
 
-PATH=/bin:/usr/bin:/sbin:/usr/sbin
+DIR=$(dirname "$0")
+. "${DIR}/hotplugpath.sh"
+
+PATH=${BINDIR}:${SBINDIR}:${LIBEXEC}:${PRIVATE_BINDIR}:/bin:/usr/bin:/sbin:/usr/sbin
 export PATH
 
 xpath=$1
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/NetBSD/vif-ip-nbsd
--- a/tools/hotplug/NetBSD/vif-ip-nbsd  Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/NetBSD/vif-ip-nbsd  Tue Jun 23 17:25:51 2009 +0100
@@ -4,7 +4,10 @@
 # Called by xenbackendd
 # Usage: vif-ip xsdir_backend_path state
 
-PATH=/bin:/usr/bin:/sbin:/usr/sbin
+DIR=$(dirname "$0")
+. "${DIR}/hotplugpath.sh"
+
+PATH=${BINDIR}:${SBINDIR}:${LIBEXEC}:${PRIVATE_BINDIR}:/bin:/usr/bin:/sbin:/usr/sbin
 export PATH
 
 xpath=$1
diff -r b7f73a7f3078 -r 415505139333 tools/hotplug/common/Makefile
--- a/tools/hotplug/common/Makefile     Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/hotplug/common/Makefile     Tue Jun 23 17:25:51 2009 +0100
@@ -1,17 +1,22 @@ XEN_ROOT = ../../../
-XEN_ROOT = ../../../
+XEN_ROOT = ../../..
 include $(XEN_ROOT)/tools/Rules.mk
+
+HOTPLUGPATH="hotplugpath.sh"
 
 # OS-independent hotplug scripts go in this directory
 
-# Xen script dir and scripts to go there.
-XEN_SCRIPTS =
+# Xen scripts to go there.
+XEN_SCRIPTS = $(HOTPLUGPATH)
 XEN_SCRIPT_DATA =
 
+genpath-target = $(call buildmakevars2file,$(HOTPLUGPATH))
+$(eval $(genpath-target))
+
 .PHONY: all
-all:
+all: build
 
 .PHONY: build
-build:
+build: genpath
 
 .PHONY: install
 install: all install-scripts
@@ -31,3 +36,4 @@ install-scripts:
 
 .PHONY: clean
 clean:
+       rm -f $(HOTPLUGPATH)
diff -r b7f73a7f3078 -r 415505139333 tools/python/Makefile
--- a/tools/python/Makefile     Tue Jun 23 17:24:14 2009 +0100
+++ b/tools/python/Makefile     Tue Jun 23 17:25:51 2009 +0100
@@ -14,20 +14,11 @@ CATALOGS = $(patsubst %,xen/xm/messages/
 CATALOGS = $(patsubst %,xen/xm/messages/%.mo,$(LINGUAS))
 NLSDIR = $(SHAREDIR)/locale
 XENPATH = "xen/util/path.py"
-  
-.PHONY: build buildpy genpath
-genpath:
-       rm -f $(XENPATH)
-       echo "SBINDIR=\"$(SBINDIR)\"" >> $(XENPATH)
-       echo "BINDIR=\"$(BINDIR)\"" >> $(XENPATH)
-       echo "LIBEXEC=\"$(LIBEXEC)\"" >> $(XENPATH)
-       echo "LIBDIR=\"$(LIBDIR)\"" >> $(XENPATH)
-       echo "SHAREDIR=\"$(SHAREDIR)\"" >> $(XENPATH)
-       echo "PRIVATE_BINDIR=\"$(PRIVATE_BINDIR)\"" >> $(XENPATH)
-       echo "XENFIRMWAREDIR=\"$(XENFIRMWAREDIR)\"" >> $(XENPATH)
-       echo "XEN_CONFIG_DIR=\"$(XEN_CONFIG_DIR)\"" >> $(XENPATH)
-       echo "XEN_SCRIPT_DIR=\"$(XEN_SCRIPT_DIR)\"" >> $(XENPATH)
 
+genpath-target = $(call buildmakevars2file,$(XENPATH))
+$(eval $(genpath-target))
+
+.PHONY: build buildpy
 buildpy: genpath 
        CC="$(CC)" CFLAGS="$(CFLAGS)" $(PYTHON) setup.py build
 

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