[libvirt] [PATCH 06/10] ci: Introduce $(CI_BUILD_SCRIPT)

[Andrea Bolognani]

Instead of hardcoding build instructions into the Makefile,
move them to a separate script that's mounted into the
container.

This gives us a couple of advantages: we no longer have to
deal with the awkward quoting required when embedding shell
code in a Makefile, and we also provide the users with a way
to override the default build instructions with their own.

Signed-off-by: Andrea Bolognani <abologna at redhat.com>
---
 Makefile.am |  1 +
 ci/Makefile | 48 ++++++++++++++++++------------------------------
 ci/build.sh | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 59 insertions(+), 30 deletions(-)
 create mode 100644 ci/build.sh

diff --git a/Makefile.am b/Makefile.am
index b743b4b08b..96fac92186 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -51,6 +51,7 @@ EXTRA_DIST = \
   build-aux/useless-if-before-free \
   build-aux/vc-list-files \
   ci/Makefile \
+  ci/build.sh \
   $(NULL)
 
 pkgconfigdir = $(libdir)/pkgconfig
diff --git a/ci/Makefile b/ci/Makefile
index dc7ee6c037..f7e31b4f97 100644
--- a/ci/Makefile
+++ b/ci/Makefile
@@ -41,6 +41,9 @@ CI_MAKE_ARGS =
 # Any extra arguments to pass to configure
 CI_CONFIGURE_ARGS =
 
+# Script containing build instructions
+CI_BUILD_SCRIPT = $(CI_ROOTDIR)/build.sh
+
 # Location of the container images we're going to pull
 # Can be useful to overridde to use a locally built
 # image instead
@@ -96,6 +99,10 @@ CI_HOME_MOUNTS = \
 	--volume $(CI_SCRATCHDIR)/home:$(CI_USER_HOME):z \
 	$(NULL)
 
+CI_SCRIPT_MOUNTS = \
+	--volume $(CI_SCRATCHDIR)/build:$(CI_USER_HOME)/build:z \
+	$(NULL)
+
 # Docker containers can have very large ulimits
 # for nofiles - as much as 1048576. This makes
 # libvirt very slow at exec'ing programs.
@@ -169,6 +176,7 @@ CI_ENGINE_ARGS = \
 	$(CI_PODMAN_ARGS) \
 	$(CI_PWDB_MOUNTS) \
 	$(CI_HOME_MOUNTS) \
+	$(CI_SCRIPT_MOUNTS) \
 	--volume $(CI_HOST_SRCDIR):$(CI_CONT_SRCDIR):z \
 	--workdir $(CI_CONT_SRCDIR) \
 	--ulimit nofile=$(CI_ULIMIT_FILES):$(CI_ULIMIT_FILES) \
@@ -186,6 +194,8 @@ ci-prepare-tree: ci-check-engine
 		cp /etc/passwd $(CI_SCRATCHDIR); \
 		cp /etc/group $(CI_SCRATCHDIR); \
 		mkdir -p $(CI_SCRATCHDIR)/home; \
+		cp "$(CI_BUILD_SCRIPT)" $(CI_SCRATCHDIR)/build; \
+		chmod +x "$(CI_SCRATCHDIR)/build"; \
 		echo "Cloning $(CI_GIT_ROOT) to $(CI_HOST_SRCDIR)"; \
 		git clone $(CI_GIT_ARGS) $(CI_GIT_ROOT) $(CI_HOST_SRCDIR) || exit 1; \
 		for mod in $$(git submodule | awk '{ print $$2 }' | sed -E 's,^../,,g') ; \
@@ -196,38 +206,16 @@ ci-prepare-tree: ci-check-engine
 		done ; \
 	fi
 
-# $CONFIGURE_OPTS is a env that can optionally be set in the container,
-# populated at build time from the Dockerfile. A typical use case would
-# be to pass --host/--target args to trigger cross-compilation
-#
-# This can be augmented by make local args in $(CI_CONFIGURE_ARGS)
-#
-# gl_public_submodule_commit= to disable gnulib's submodule check
-# which breaks due to way we clone the submodules
 ci-build@%: ci-prepare-tree
 	$(CI_ENGINE) run $(CI_ENGINE_ARGS) $(CI_IMAGE_PREFIX)$*$(CI_IMAGE_TAG) \
-		/bin/bash -c '\
-		mkdir -p $(CI_CONT_BUILDDIR) || exit 1 ; \
-		cd $(CI_CONT_BUILDDIR) ; \
-		NOCONFIGURE=1 $(CI_CONT_SRCDIR)/autogen.sh || exit 1 ; \
-		$(CI_CONFIGURE) $${CONFIGURE_OPTS} $(CI_CONFIGURE_ARGS) ; \
-		if test $$? != 0 ; \
-		then \
-			test -f config.log && cat config.log ; \
-			exit 1 ; \
-		fi; \
-		find -name test-suite.log -delete ; \
-		export VIR_TEST_DEBUG=1 ; \
-		make -j$(CI_SMP) gl_public_submodule_commit= $(CI_MAKE_ARGS) ; \
-		if test $$? != 0 ; then \
-			LOGS=`find -name test-suite.log` ; \
-			if test "$${LOGS}" != "" ; then \
-				echo "=== LOG FILE(S) START ===" ; \
-				cat $${LOGS} ; \
-				echo "=== LOG FILE(S) END ===" ; \
-			fi ; \
-			exit 1 ;\
-		fi'
+		/bin/bash -c ' \
+		export CI_CONT_SRCDIR="$(CI_CONT_SRCDIR)"; \
+		export CI_CONT_BUILDDIR="$(CI_CONT_BUILDDIR)"; \
+		export CI_SMP="$(CI_SMP)"; \
+		export CI_CONFIGURE="$(CI_CONFIGURE)"; \
+		export CI_CONFIGURE_ARGS="$(CI_CONFIGURE_ARGS)"; \
+		export CI_MAKE_ARGS="$(CI_MAKE_ARGS)"; \
+		$(CI_USER_HOME)/build || exit 1'
 	@test "$(CI_CLEAN)" = "1" && rm -rf $(CI_SCRATCHDIR) || :
 
 ci-check@%:
diff --git a/ci/build.sh b/ci/build.sh
new file mode 100644
index 0000000000..0874c2d1d9
--- /dev/null
+++ b/ci/build.sh
@@ -0,0 +1,40 @@
+# This script is used to build libvirt inside the container.
+#
+# You can customize it to your liking, or alternatively use a
+# completely different script by passing
+#
+#  CI_BUILD_SCRIPT=/path/to/your/build/script
+#
+# to make.
+
+mkdir -p "$CI_CONT_BUILDDIR" || exit 1
+cd "$CI_CONT_BUILDDIR"
+
+export VIR_TEST_DEBUG=1
+NOCONFIGURE=1 "$CI_CONT_SRCDIR/autogen.sh" || exit 1
+
+# $CONFIGURE_OPTS is a env that can optionally be set in the container,
+# populated at build time from the Dockerfile. A typical use case would
+# be to pass --host/--target args to trigger cross-compilation
+#
+# This can be augmented by make local args in $CI_CONFIGURE_ARGS
+"$CI_CONFIGURE" $CONFIGURE_OPTS $CI_CONFIGURE_ARGS
+if test $? != 0; then
+    test -f config.log && cat config.log
+    exit 1
+fi
+find -name test-suite.log -delete
+
+# gl_public_submodule_commit= to disable gnulib's submodule check
+# which breaks due to way we clone the submodules
+make -j"$CI_SMP" gl_public_submodule_commit= $CI_MAKE_ARGS
+
+if test $? != 0; then \
+    LOGS=$(find -name test-suite.log)
+    if test "$LOGS"; then
+        echo "=== LOG FILE(S) START ==="
+        cat $LOGS
+        echo "=== LOG FILE(S) END ==="
+    fi
+    exit 1
+fi
-- 
2.21.0