From 4498fe1a2a7c4d28e07be5a8e5088afc2bd34c2b Mon Sep 17 00:00:00 2001
From: Sheng Mao <shngmao@gmail.com>
Date: Wed, 19 Aug 2020 22:36:18 -0600
Subject: [PATCH] libbtrfsutil: add pkg-config spec file

Add pkg-config file for libbtrfsutil which can be used to set up
compilation and link flags.

The paths in pc file depend on prefix variable but ignore DESTDIR.
DESTDIR is used for packaging and it should not affect the paths in pc
file.

Issue: #285
Signed-off-by: Sheng Mao <shngmao@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
 .gitignore                      |  2 ++
 Makefile                        |  2 ++
 Makefile.inc.in                 |  1 +
 configure.ac                    | 12 ++++++++++++
 libbtrfsutil/libbtrfsutil.pc.in | 11 +++++++++++
 5 files changed, 28 insertions(+)
 create mode 100644 libbtrfsutil/libbtrfsutil.pc.in

diff --git a/.gitignore b/.gitignore
index 1c70ec94..08e26bb9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,6 +35,8 @@
 /libbtrfsutil.so*
 /libbtrfsutil.a
 
+/libbtrfsutil/libbtrfsutil.pc
+
 /fssum
 /testsuite-id
 /tests/*-tests-results.txt
diff --git a/Makefile b/Makefile
index c788b91b..381b630d 100644
--- a/Makefile
+++ b/Makefile
@@ -779,6 +779,8 @@ endif
 	$(INSTALL) -m755 -d $(DESTDIR)$(incdir)/btrfs
 	$(INSTALL) -m644 $(libbtrfs_headers) $(DESTDIR)$(incdir)/btrfs
 	$(INSTALL) -m644 libbtrfsutil/btrfsutil.h $(DESTDIR)$(incdir)
+	$(INSTALL) -m755 -d $(DESTDIR)$(pkgconfigdir)
+	$(INSTALL) -m644 libbtrfsutil/libbtrfsutil.pc $(DESTDIR)$(pkgconfigdir)
 endif
 
 ifeq ($(PYTHON_BINDINGS),1)
diff --git a/Makefile.inc.in b/Makefile.inc.in
index f3cd2733..9f493371 100644
--- a/Makefile.inc.in
+++ b/Makefile.inc.in
@@ -41,6 +41,7 @@ libdir ?= @libdir@
 incdir = @includedir@
 udevdir = @UDEVDIR@
 udevruledir = ${udevdir}/rules.d
+pkgconfigdir = @pkgconfigdir@
 
 # external libs required by various binaries; for btrfs-foo,
 # specify btrfs_foo_libs = <list of libs>; see $($(subst...)) rules in Makefile
diff --git a/configure.ac b/configure.ac
index 8acbf984..7b7675aa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,6 +12,10 @@ LIBBTRFS_MAJOR=0
 LIBBTRFS_MINOR=1
 LIBBTRFS_PATCHLEVEL=2
 
+BTRFS_UTIL_VERSION_MAJOR=`sed -rn 's/^\#define BTRFS_UTIL_VERSION_MAJOR ([0-9])+$/\1/p' libbtrfsutil/btrfsutil.h`
+BTRFS_UTIL_VERSION_MINOR=`sed -rn 's/^\#define BTRFS_UTIL_VERSION_MINOR ([0-9])+$/\1/p' libbtrfsutil/btrfsutil.h`
+BTRFS_UTIL_VERSION_PATCH=`sed -rn 's/^\#define BTRFS_UTIL_VERSION_PATCH ([0-9])+$/\1/p' libbtrfsutil/btrfsutil.h`
+
 CFLAGS=${CFLAGS:-"-g -O1 -Wall -D_FORTIFY_SOURCE=2"}
 AC_SUBST([CFLAGS])
 
@@ -300,18 +304,25 @@ AC_SUBST([LZO2_LIBS])
 AC_SUBST([LZO2_LIBS_STATIC])
 AC_SUBST([LZO2_CFLAGS])
 
+dnl call PKG_INSTALLDIR from pkg.m4 to set pkgconfigdir
+m4_ifdef([PKG_INSTALLDIR], [PKG_INSTALLDIR], [AC_MSG_ERROR([please install pkgconf])])
 
 dnl library stuff
 AC_SUBST([LIBBTRFS_MAJOR])
 AC_SUBST([LIBBTRFS_MINOR])
 AC_SUBST([LIBBTRFS_PATCHLEVEL])
 
+AC_SUBST([BTRFS_UTIL_VERSION_MAJOR])
+AC_SUBST([BTRFS_UTIL_VERSION_MINOR])
+AC_SUBST([BTRFS_UTIL_VERSION_PATCH])
+
 AC_CONFIG_HEADERS([config.h])
 
 AC_CONFIG_FILES([
 Makefile.inc
 Documentation/Makefile
 version.h
+libbtrfsutil/libbtrfsutil.pc
 ])
 
 AC_OUTPUT
@@ -327,6 +338,7 @@ AC_MSG_RESULT([
 	bindir:             ${bindir}
 	libdir:             ${libdir}
 	includedir:         ${includedir}
+	pkgconfigdir:       ${pkgconfigdir}
 
 	compiler:           ${CC}
 	cflags:             ${CFLAGS}
diff --git a/libbtrfsutil/libbtrfsutil.pc.in b/libbtrfsutil/libbtrfsutil.pc.in
new file mode 100644
index 00000000..81e66622
--- /dev/null
+++ b/libbtrfsutil/libbtrfsutil.pc.in
@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libbtrfsutil
+Description: libbtrfsutil library
+Version: @BTRFS_UTIL_VERSION_MAJOR@.@BTRFS_UTIL_VERSION_MINOR@.@BTRFS_UTIL_VERSION_PATCH@
+URL: http://btrfs.wiki.kernel.org
+Cflags: -I${includedir}
+Libs: -L${libdir} -lbtrfsutil