configure: add --without-libarchive option

Teach configure the --without-libarchive option, which forcibly
disables use of the libarchive library.

The option --with-libarchive=direct will disable the use of dlopen,
and will link mke2fs with -larchive directly.  This doesn't work when
building mke2f.static, since -larchive has a large number of
depedencies, and even "pkgconf --libs --static libarchive" doesn't
provide all of the appropriate library dependencies.  :-(

Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Author: tytso

configure

@@ -930,6 +930,7 @@ enable_rpath
 with_libiconv_prefix
 with_libintl_prefix
 enable_largefile
+with_libarchive
 enable_fuse2fs
 enable_lto
 enable_ubsan
@@ -1646,6 +1647,7 @@ Optional Packages:
   --without-libiconv-prefix     don't search for libiconv in includedir and libdir
   --with-libintl-prefix[=DIR]  search for libintl in DIR/include and DIR/lib
   --without-libintl-prefix     don't search for libintl in includedir and libdir
+  --without-libarchive    disable use of libarchive
   --with-multiarch=ARCH   specify the multiarch triplet
   --with-udev-rules-dir[=DIR]
                           Install udev rules into DIR.
@@ -13734,7 +13736,37 @@ if test "$ac_cv_func_dlopen" = yes ; then
    MAGIC_LIB=$DLOPEN_LIB
 fi
 
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for archive_read_new in -larchive" >&5
+
+# Check whether --with-libarchive was given.
+if test ${with_libarchive+y}
+then :
+  withval=$with_libarchive; if test "$withval" = "no"
+then
+	try_libarchive=""
+	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: Disabling libarchive support" >&5
+printf "%s\n" "Disabling libarchive support" >&6; }
+elif test "$withval" = "direct"
+then
+	try_libarchive="direct"
+	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: Testing for libarchive support (forced direct link)" >&5
+printf "%s\n" "Testing for libarchive support (forced direct link)" >&6; }
+else
+	try_libarchive="yes"
+	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: Testing for libarchive support (with dlopen)" >&5
+printf "%s\n" "Testing for libarchive support (with dlopen)" >&6; }
+fi
+
+else $as_nop
+  try_libarchive="yes"
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: Try testing for libarchive support (with dlopen) by default" >&5
+printf "%s\n" "Try testing for libarchive support (with dlopen) by default" >&6; }
+
+fi
+
+ARCHIVE_LIB=
+if test -n "$try_libarchive"
+then
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for archive_read_new in -larchive" >&5
 printf %s "checking for archive_read_new in -larchive... " >&6; }
 if test ${ac_cv_lib_archive_archive_read_new+y}
 then :
@@ -13772,7 +13804,7 @@ printf "%s\n" "$ac_cv_lib_archive_archive_read_new" >&6; }
 if test "x$ac_cv_lib_archive_archive_read_new" = xyes
 then :
   ARCHIVE_LIB=-larchive
-ac_fn_c_check_header_compile "$LINENO" "archive.h" "ac_cv_header_archive_h" "$ac_includes_default"
+    ac_fn_c_check_header_compile "$LINENO" "archive.h" "ac_cv_header_archive_h" "$ac_includes_default"
 if test "x$ac_cv_header_archive_h" = xyes
 then :
   printf "%s\n" "#define HAVE_ARCHIVE_H 1" >>confdefs.h
@@ -13781,8 +13813,17 @@ fi
 
 fi
 
-if test "$ac_cv_func_dlopen" = yes ; then
-   ARCHIVE_LIB=$DLOPEN_LIB
+    if test "$ac_cv_func_dlopen" = yes -a "$try_libarchive" != "direct"; then
+        ARCHIVE_LIB=$DLOPEN_LIB
+
+printf "%s\n" "#define CONFIG_DLOPEN_LIBARCHIVE 1" >>confdefs.h
+
+
+    fi
+    if test "$ac_cv_header_archive_h" != "yes"
+    then
+        ARCHIVE_LIB=
+    fi
 fi
 
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for clock_gettime in -lrt" >&5

configure.ac

@@ -1301,10 +1301,39 @@ AC_SUBST(MAGIC_LIB)
 dnl
 dnl libarchive
 dnl
-AC_CHECK_LIB(archive, archive_read_new, [ARCHIVE_LIB=-larchive
-AC_CHECK_HEADERS([archive.h])])
-if test "$ac_cv_func_dlopen" = yes ; then
-   ARCHIVE_LIB=$DLOPEN_LIB
+AC_ARG_WITH([libarchive],
+AS_HELP_STRING([--without-libarchive],[disable use of libarchive]),
+[if test "$withval" = "no"
+then
+	try_libarchive=""
+	AC_MSG_RESULT([Disabling libarchive support])
+elif test "$withval" = "direct"
+then
+	try_libarchive="direct"
+	AC_MSG_RESULT([Testing for libarchive support (forced direct link)])
+else
+	try_libarchive="yes"
+	AC_MSG_RESULT([Testing for libarchive support (with dlopen)])
+fi]
+,
+try_libarchive="yes"
+AC_MSG_RESULT([Try testing for libarchive support (with dlopen) by default])
+)
+ARCHIVE_LIB=
+if test -n "$try_libarchive"
+then
+    AC_CHECK_LIB(archive, archive_read_new, [ARCHIVE_LIB=-larchive
+    AC_CHECK_HEADERS([archive.h])])
+    if test "$ac_cv_func_dlopen" = yes -a "$try_libarchive" != "direct"; then
+        ARCHIVE_LIB=$DLOPEN_LIB
+	AC_DEFINE(CONFIG_DLOPEN_LIBARCHIVE, 1,
+		[Define to 1 if using dlopen to access libarchive])
+
+    fi
+    if test "$ac_cv_header_archive_h" != "yes"
+    then
+        ARCHIVE_LIB=
+    fi
 fi
 AC_SUBST(ARCHIVE_LIB)
 dnl

lib/config.h.in

@@ -12,6 +12,9 @@
 /* Define to 1 for features for use by ext4 developers */
 #undef CONFIG_DEVELOPER_FEATURES
 
+/* Define to 1 if using dlopen to access libarchive */
+#undef CONFIG_DLOPEN_LIBARCHIVE
+
 /* Define to 1 if debugging ext3/4 journal code */
 #undef CONFIG_JBD_DEBUG
 

misc/Makefile.in

@@ -290,7 +290,7 @@ mke2fs.static: $(MKE2FS_OBJS) $(STATIC_DEPLIBS) $(STATIC_LIBE2P) $(DEPSTATIC_LIB
 	$(Q) $(CC) $(LDFLAGS_STATIC) -o mke2fs.static $(MKE2FS_OBJS) \
 		$(STATIC_LIBS) $(STATIC_LIBE2P) \
 		$(STATIC_LIBBLKID) $(STATIC_LIBUUID) $(LIBINTL) $(SYSLIBS) \
-		$(LIBMAGIC)
+		$(LIBMAGIC) $(LIBARCHIVE)
 
 mke2fs.profiled: $(MKE2FS_OBJS) $(PROFILED_DEPLIBS) \
 	$(PROFILED_LIBE2P) $(PROFILED_DEPLIBBLKID) $(PROFILED_DEPLIBUUID)

misc/create_inode_libarchive.c

@@ -51,7 +51,7 @@ static int (*dl_archive_read_open_filename)(struct archive *,
 static int (*dl_archive_read_support_filter_all)(struct archive *);
 static int (*dl_archive_read_support_format_all)(struct archive *);
 
-#ifdef HAVE_DLOPEN
+#ifdef CONFIG_DLOPEN_LIBARCHIVE
 #include <dlfcn.h>
 
 static void *libarchive_handle;