Config.mk: replace dependency to genpath with actual targe

genpath is a detail of buildmakevars2file. Replace the dependency to
genpath with the actual buildmakevars2file target. This change by
itself does not fix any bug. Upcoming changes will add dependencies to
$(target), but no rule exist to create $(target).

No change in behaviour is expected by this patch.

Note: target.tmp ($(1).tmp) is not marked as .PHONY because
move-if-changed in the target rule will remove target.tmp by renaming
it to target. As a result make will always attempt to rebuild it.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Config.mk: add new macro buildmakevars2header

This macro is similar to buildmakevars2file, it just creates a C header
file instead of shell style syntax. Upcoming changes will use this macro
in libxl and libxc.

Note: if target ($(1)) is marked as .PHONY everything that depends on
target will be constantly rebuild. The reason for that seems to be that
make will internally drop target. As a result target is non-existant,
which triggers a rebuild. With the intermediate target.tmp this will not
happen because target changes only if target.tmp really changes.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
tools/libxl: use buildmakevars2header to create _paths.h

Replace usage of buildmakevars2file with buildmakevars2header. The macro
generates a C header file, so remove code which converts shell variables
into C defines. Also update the dependency, the macro itself creates a
dependency for _paths.h. A temporary file is not needed anymore.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
tools/libxc: provide variable paths to libxc

In preparation to remove hardcoded /var/run/xen paths, provide
XEN_RUN_DIR and related directories to xc_private.h. Similar code exists
already for libxl, stubdom and other parts.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
tools/libxc: use XEN_RUN_DIR for SUSPEND_LOCK_FILE

Remove hardcoded /var/run/xen directory path, use XEN_RUN_DIR instead.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
tools/pygrub: store kernels in /var/run/xen/pygrub

Move location of temporary bootfiles from /var/run/xend/boot to
/var/run/xen/pygrub. Create the subdirectory if does not exist.
The <dir> argument --output-directory must be an existing directory.

The reason for this change is that all entrys below /var/run have to be
created at runtime in case /var/run is cleared on every boot.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
tools/hotplug: use XEN_SCRIPT_DIR instead of hardcoded path

Helper scripts get installed into XEN_SCRIPT_DIR, but initscripts,
helper scripts and udev rules still refer to the hardcoded location
/etc/xen/scripts/. Update scripts, rules and Makefile to refer to
@@XEN_SCRIPT_DIR@@ instead.

Signed-off-by: Olaf Hering <olaf@aepfle.de>