[fsverity-utils PATCH v2 2/2] Generate and install libfsverity.pc

[luca.boccassi@gmail.com]

From: Luca Boccassi <luca.boccassi@microsoft.com>

pkg-config is commonly used by libraries to convey information about
compiler flags and dependencies.
As packagers, we heavily rely on it so that all our tools do the right
thing by default regardless of the environment.

Signed-off-by: Luca Boccassi <luca.boccassi@microsoft.com>
---
v2: add pc file to .gitignore
    add and use QUIET_GEN prefix
    add install variables to .build-config
    have libfsverity.pc depend on lib/libfsverity.pc.in

 .gitignore            |  1 +
 Makefile              | 16 ++++++++++++++--
 lib/libfsverity.pc.in | 10 ++++++++++
 scripts/do-release.sh |  2 ++
 4 files changed, 27 insertions(+), 2 deletions(-)
 create mode 100644 lib/libfsverity.pc.in

diff --git a/.gitignore b/.gitignore
index 04f9a6f..572da31 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,5 +9,6 @@
 /run-tests.log
 /test_*
 cscope.*
+libfsverity.pc
 ncscope.*
 tags
diff --git a/Makefile b/Makefile
index d7e6eb2..6fdf91a 100644
--- a/Makefile
+++ b/Makefile
@@ -51,6 +51,7 @@ QUIET_CC        = @echo '  CC      ' $@;
 QUIET_CCLD      = @echo '  CCLD    ' $@;
 QUIET_AR        = @echo '  AR      ' $@;
 QUIET_LN        = @echo '  LN      ' $@;
+QUIET_GEN       = @echo '  GEN     ' $@;
 endif
 USE_SHARED_LIB  ?=
 PREFIX          ?= /usr/local
@@ -62,7 +63,7 @@ PKGCONF         ?= pkg-config
 
 # Rebuild if a user-specified setting that affects the build changed.
 .build-config: FORCE
-	@flags='$(CC):$(CFLAGS):$(CPPFLAGS):$(LDFLAGS):$(USE_SHARED_LIB)'; \
+	@flags='$(CC):$(CFLAGS):$(CPPFLAGS):$(LDFLAGS):$(USE_SHARED_LIB):$(PREFIX):$(LIBDIR):$(INCDIR):$(BINDIR)'; \
 	if [ "$$flags" != "`cat $@ 2>/dev/null`" ]; then		\
 		[ -e $@ ] && echo "Rebuilding due to new settings";	\
 		echo "$$flags" > $@;					\
@@ -119,6 +120,15 @@ libfsverity.so:libfsverity.so.$(SOVERSION)
 
 DEFAULT_TARGETS += libfsverity.so
 
+# Create the pkg-config file
+libfsverity.pc: lib/libfsverity.pc.in
+	$(QUIET_GEN) sed -e "s|@PREFIX@|$(PREFIX)|" \
+		-e "s|@LIBDIR@|$(LIBDIR)|" \
+		-e "s|@INCDIR@|$(INCDIR)|" \
+		$< > $@
+
+DEFAULT_TARGETS += libfsverity.pc
+
 ##############################################################################
 
 #### Programs
@@ -190,11 +200,12 @@ check:fsverity test_programs
 	@echo "All tests passed!"
 
 install:all
-	install -d $(DESTDIR)$(LIBDIR) $(DESTDIR)$(INCDIR) $(DESTDIR)$(BINDIR)
+	install -d $(DESTDIR)$(LIBDIR)/pkgconfig $(DESTDIR)$(INCDIR) $(DESTDIR)$(BINDIR)
 	install -m755 fsverity $(DESTDIR)$(BINDIR)
 	install -m644 libfsverity.a $(DESTDIR)$(LIBDIR)
 	install -m755 libfsverity.so.$(SOVERSION) $(DESTDIR)$(LIBDIR)
 	ln -sf libfsverity.so.$(SOVERSION) $(DESTDIR)$(LIBDIR)/libfsverity.so
+	install -m644 libfsverity.pc $(DESTDIR)$(LIBDIR)/pkgconfig
 	install -m644 include/libfsverity.h $(DESTDIR)$(INCDIR)
 
 uninstall:
@@ -202,6 +213,7 @@ uninstall:
 	rm -f $(DESTDIR)$(LIBDIR)/libfsverity.a
 	rm -f $(DESTDIR)$(LIBDIR)/libfsverity.so.$(SOVERSION)
 	rm -f $(DESTDIR)$(LIBDIR)/libfsverity.so
+	rm -f $(DESTDIR)$(LIBDIR)/pkgconfig/libfsverity.pc
 	rm -f $(DESTDIR)$(INCDIR)/libfsverity.h
 
 help:
diff --git a/lib/libfsverity.pc.in b/lib/libfsverity.pc.in
new file mode 100644
index 0000000..613e9bc
--- /dev/null
+++ b/lib/libfsverity.pc.in
@@ -0,0 +1,10 @@
+prefix=@PREFIX@
+libdir=@LIBDIR@
+includedir=@INCDIR@
+
+Name: libfsverity
+Description: fs-verity library
+Version: 1.2
+Libs: -L${libdir} -lfsverity
+Requires.private: libcrypto
+Cflags: -I${includedir}
diff --git a/scripts/do-release.sh b/scripts/do-release.sh
index 255fc53..352fcf1 100755
--- a/scripts/do-release.sh
+++ b/scripts/do-release.sh
@@ -28,6 +28,8 @@ minor=$(echo "$VERS" | cut -d. -f2)
 sed -E -i -e "/FSVERITY_UTILS_MAJOR_VERSION/s/[0-9]+/$major/" \
 	  -e "/FSVERITY_UTILS_MINOR_VERSION/s/[0-9]+/$minor/" \
 	  include/libfsverity.h
+sed -E -i "/Version:/s/[0-9]+\.[0-9]+/$VERS/" \
+	  lib/libfsverity.pc.in
 git commit -a --signoff --message="v$VERS"
 git tag --sign "v$VERS" --message="$PKG"
 
-- 
2.20.1