[PATCH 3/4] Build grub.xen.

[Colin Watson <cjwatson@ubuntu.com>]

* .gitignore: Add xen.cfg.
* Makefile.am (grub-core/xen.cfg): New rule.
(grub.xen): Likewise.  Add to platform_DATA.
* configure.ac (COND_xen): New conditional.
* grub-core/Makefile.core.def (xen.cfg): New definition.
* grub-core/boot/xen/xen.cfg.in: New file.  This is suitable for
installation both in the dom0 filesystem (where it will find and
chainload a secondary grub.xen) and in the domU filesystem (where it
will load a matching grub.cfg).
---
 .gitignore                    |  1 +
 ChangeLog                     | 14 ++++++++++++++
 Makefile.am                   | 14 ++++++++++++++
 configure.ac                  |  1 +
 grub-core/Makefile.core.def   |  7 +++++++
 grub-core/boot/xen/xen.cfg.in | 31 +++++++++++++++++++++++++++++++
 6 files changed, 68 insertions(+)
 create mode 100644 grub-core/boot/xen/xen.cfg.in

diff --git a/.gitignore b/.gitignore
index 2292cc9..51aa8b4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -153,6 +153,7 @@ trigtables.c
 uhci_test
 update-grub_lib
 unidata.c
+xen.cfg
 xzcompress_test
 Makefile.in
 GPATH
diff --git a/ChangeLog b/ChangeLog
index fc86601..58304f7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,19 @@
 2013-12-12  Colin Watson  <cjwatson@ubuntu.com>
 
+	Build grub.xen.
+
+	* .gitignore: Add xen.cfg.
+	* Makefile.am (grub-core/xen.cfg): New rule.
+	(grub.xen): Likewise.  Add to platform_DATA.
+	* configure.ac (COND_xen): New conditional.
+	* grub-core/Makefile.core.def (xen.cfg): New definition.
+	* grub-core/boot/xen/xen.cfg.in: New file.  This is suitable for
+	installation both in the dom0 filesystem (where it will find and
+	chainload a secondary grub.xen) and in the domU filesystem (where it
+	will load a matching grub.cfg).
+
+2013-12-12  Colin Watson  <cjwatson@ubuntu.com>
+
 	Accept environment variables on the command line for Xen.
 
 	* grub-core/kern/xen/init.c (fetch_command_line_word): New function.
diff --git a/Makefile.am b/Makefile.am
index 0a2c099..e9792f6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -402,6 +402,20 @@ default_payload.elf: grub-mkstandalone grub-mkimage
 	pkgdatadir=. ./grub-mkstandalone --grub-mkimage=./grub-mkimage -O i386-coreboot -o $@ --modules='ahci pata ehci uhci ohci usb_keyboard usbms part_msdos xfs ext2 fat at_keyboard part_gpt usbserial_usbdebug cbfs' --install-modules='ls linux search configfile normal cbtime cbls memrw iorw minicmd lsmmap lspci halt reboot hexdump pcidump regexp setpci lsacpi chain test' --fonts= --themes= --locales= -d grub-core/ /boot/grub/grub.cfg=$(srcdir)/coreboot.cfg
 endif
 
+if COND_xen
+# The grub-core/util split means that we have to duplicate rules a little
+# bit here.
+grub-core/xen.cfg: grub-core/boot/xen/xen.cfg.in
+	$(MAKE) -C grub-core xen.cfg
+
+grub.xen: grub-mkstandalone grub-mkimage grub-core/xen.cfg
+	pkgdatadir=. ./grub-mkstandalone --grub=mkimage=./grub-mkimage \
+		   -o $@ -O $(target_cpu)-$(platform) -d grub-core/ \
+		   /boot/grub/grub.cfg=grub-core/xen.cfg
+
+platform_DATA += grub.xen
+endif
+
 windowsdir=$(top_builddir)/$(PACKAGE)-$(VERSION)-for-windows
 windowsdir: $(PROGRAMS) $(starfield_DATA) $(platform_DATA)
 	test -d $(windowsdir) && rm -rf $(windowsdir) || true
diff --git a/configure.ac b/configure.ac
index 0abbb99..08aa751 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1590,6 +1590,7 @@ AM_CONDITIONAL([COND_i386_ieee1275], [test x$target_cpu = xi386 -a x$platform =
 AM_CONDITIONAL([COND_i386_coreboot], [test x$target_cpu = xi386 -a x$platform = xcoreboot])
 AM_CONDITIONAL([COND_i386_multiboot], [test x$target_cpu = xi386 -a x$platform = xmultiboot])
 AM_CONDITIONAL([COND_x86_64_efi], [test x$target_cpu = xx86_64 -a x$platform = xefi])
+AM_CONDITIONAL([COND_xen], [test x$platform = xxen])
 AM_CONDITIONAL([COND_i386_xen], [test x$target_cpu = xi386 -a x$platform = xxen])
 AM_CONDITIONAL([COND_x86_64_xen], [test x$target_cpu = xx86_64 -a x$platform = xxen])
 AM_CONDITIONAL([COND_mips_loongson], [test x$target_cpu = xmipsel -a x$platform = xloongson])
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 060de44..63a8351 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -44,6 +44,13 @@ script = {
   enable = powerpc_ieee1275;
 };
 
+script = {
+  installdir = platform;
+  name = xen.cfg;
+  common = boot/xen/xen.cfg.in;
+  enable = xen;
+};
+
 kernel = {
   name = kernel;
 
diff --git a/grub-core/boot/xen/xen.cfg.in b/grub-core/boot/xen/xen.cfg.in
new file mode 100644
index 0000000..e2e590c
--- /dev/null
+++ b/grub-core/boot/xen/xen.cfg.in
@@ -0,0 +1,31 @@
+if [ -z "$grub_xen_guest" ]; then
+	# This is the copy of grub.xen installed in the dom0's filesystem.
+	# Look for a copy in the domU's filesystem and chainload that.  This
+	# allows us to guarantee that GRUB will be in sync with the
+	# configuration file in the domU.  The file locations here must not
+	# have any configure-generated substitutions applied, as the intent
+	# is that a single grub.xen should be able to cope with a variety of
+	# domU systems.
+	if search --set=root --file /boot/grub/grub.xen; then
+		linux /boot/grub/grub.xen grub_xen_guest=1
+		boot
+	elif search --set=root --file=/boot/grub2/grub.xen; then
+		linux /boot/grub2/grub.xen grub_xen_guest=1
+		boot
+	else
+		echo "No grub.xen found in guest filesystem.  Tried:"
+		echo "  /boot/grub/grub.xen"
+		echo "  /boot/grub2/grub.xen"
+		halt
+	fi
+else
+	# This is the copy of grub.xen installed in the domU's filesystem.
+	# Read its configuration file.
+	if search --set=root --exclude=memdisk --file \
+			/@bootdirname@/@grubdirname@/grub.cfg; then
+		configfile /@bootdirname@/@grubdirname@/grub.cfg
+	else
+		echo "No /@bootdirname@/@grubdirname@/grub.cfg found in guest filesystem."
+		halt
+	fi
+fi
-- 
1.8.4.4