Re: [PATCH v1] build: isolate core libvirt libs deps from xen runtime

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On 10/06/2017 06:16 AM, Wim Ten Have wrote:
From: Wim ten Have <wim.ten.have@xxxxxxxxxx>

Generating libvirt packages per make rpm, "with-libxl=1" and "with-xen=1",
adds strict runtime dependencies per libxenlight for xen-libs package from
core libvirt-libs package.  This is not necessary and unfortunate since
those dependencies set demand to "xen-libs" package even when there's no
need for libvirt xen or libxl driver components.

This patch is to have two separate xenconfig lib tool libraries: one for
core libvirt (without XL), and a another that contains xl for libxl driver
(libvirt_driver_libxl_impl.la) which when loading the driver, loads the
remaining symbols (xen{Format,Parse}XL. For the user/sysadmin, this means
the xen dependencies are moved into libxl driver, instead of core libvirt.

Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
Signed-off-by: Wim ten Have <wim.ten.have@xxxxxxxxxx>
---
  src/Makefile.am              | 23 +++++++++++++----------
  src/libvirt_xenxlconfig.syms | 12 ------------
  2 files changed, 13 insertions(+), 22 deletions(-)
  delete mode 100644 src/libvirt_xenxlconfig.syms

diff --git a/src/Makefile.am b/src/Makefile.am
index 173fba1e6..b74856ba7 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1197,7 +1197,8 @@ XENCONFIG_SOURCES =						\
  		xenconfig/xen_sxpr.c xenconfig/xen_sxpr.h	\
  		xenconfig/xen_xm.c xenconfig/xen_xm.h
  if WITH_LIBXL
-XENCONFIG_SOURCES +=						\
+XENCONFIG_LIBXL_SOURCES =					\
+		$(XENCONFIG_SOURCES)				\
  		xenconfig/xen_xl.c xenconfig/xen_xl.h
  endif WITH_LIBXL
@@ -1258,10 +1259,17 @@ endif WITH_VMX
  if WITH_XENCONFIG
  noinst_LTLIBRARIES += libvirt_xenconfig.la
  libvirt_la_BUILT_LIBADD += libvirt_xenconfig.la
-libvirt_xenconfig_la_LIBADD = $(LIBXL_LIBS)
  libvirt_xenconfig_la_CFLAGS = \
-		-I$(srcdir)/conf -I$(srcdir)/libxl $(AM_CFLAGS)
+		-I$(srcdir)/conf $(AM_CFLAGS)
  libvirt_xenconfig_la_SOURCES = $(XENCONFIG_SOURCES)
+
+if WITH_LIBXL
+noinst_LTLIBRARIES += libvirt_xenconfig_libxl.la
+libvirt_xenconfig_libxl_la_LIBADD = $(LIBXL_LIBS)
+libvirt_xenconfig_libxl_la_CFLAGS = \
+		-I$(srcdir)/conf -I$(srcdir)/libxl $(AM_CFLAGS)
+libvirt_xenconfig_libxl_la_SOURCES = $(XENCONFIG_LIBXL_SOURCES)
+endif WITH_LIBXL
  endif WITH_XENCONFIG
@@ -1417,7 +1425,7 @@ libvirt_driver_libxl_impl_la_CFLAGS = \
  		$(AM_CFLAGS)
  libvirt_driver_libxl_impl_la_LDFLAGS = $(AM_LDFLAGS)
  libvirt_driver_libxl_impl_la_LIBADD = $(LIBXL_LIBS) \
-				      libvirt_xenconfig.la \
+				      libvirt_xenconfig_libxl.la \
  				      libvirt_secret.la
  libvirt_driver_libxl_impl_la_SOURCES = $(LIBXL_DRIVER_SOURCES)
@@ -2045,6 +2053,7 @@ EXTRA_DIST += \
  		$(VBOX_DRIVER_EXTRA_DIST)			\
  		$(VMWARE_DRIVER_SOURCES)			\
  		$(XENCONFIG_SOURCES)				\
+		$(XENCONFIG_LIBXL_SOURCES)			\
  		$(ACCESS_DRIVER_POLKIT_POLICY)
check-local: check-augeas
@@ -2228,12 +2237,6 @@ else ! WITH_XENCONFIG
  SYM_FILES += $(srcdir)/libvirt_xenconfig.syms
  endif ! WITH_XENCONFIG
-if WITH_LIBXL
-USED_SYM_FILES += $(srcdir)/libvirt_xenxlconfig.syms
-else ! WITH_LIBXL
-SYM_FILES += $(srcdir)/libvirt_xenxlconfig.syms
-endif ! WITH_LIBXL
-
  if WITH_SASL
  USED_SYM_FILES += $(srcdir)/libvirt_sasl.syms
  else ! WITH_SASL
diff --git a/src/libvirt_xenxlconfig.syms b/src/libvirt_xenxlconfig.syms
deleted file mode 100644
index dbe43aac7..000000000
--- a/src/libvirt_xenxlconfig.syms
+++ /dev/null
@@ -1,12 +0,0 @@
-#
-# These symbols are dependent upon --with-libxl via WITH_LIBXL.
-#
-
-#xenconfig/xen_xl.h
-xenFormatXL;
-xenParseXL;
-
-# Let emacs know we want case-insensitive sorting
-# Local Variables:
-# sort-fold-case: t
-# End:


I tested with all combinations of {with,without}-{xen,libxl} plus 'make dist' and didn't notice any issues, hence

Reviewed-by: Jim Fehlig <jfehlig@xxxxxxxx>

I'll push the patch shortly, along with adding a note to my todo list to move the files in xenconfig to the libxl driver when removing the legacy xen driver.

Regards,
Jim

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