[PATCH v2 11/11] xfsprogs: Add a way to compile without blkid

[Jan Tulak <jtulak@xxxxxxxxxx>]

CHANGELOG:
- added #warning message
- use dummy blkid_get_topology instead of #ifdefs
- fix autoconf (wasn't passing -DENABLE_BLKID flag, lost during
  patch cleaning.)

Because not all platforms have up-to-date blkid with required
functions, allow at least partial functionality by adding
--enable-blkid=yes/no optional configure argument.

When blkid is disabled, signature detection and device geometry
detection doesn't work.

Signed-off-by: Jan Tulak <jtulak@xxxxxxxxxx>
---
 configure.ac         | 10 +++++++++-
 include/builddefs.in |  5 +++++
 mkfs/xfs_mkfs.c      | 37 ++++++++++++++++++++++++++++++++++++-
 3 files changed, 50 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index abb7904..eeba20d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,6 +26,11 @@ AC_ARG_ENABLE(gettext,
        enable_gettext=yes)
 AC_SUBST(enable_gettext)
 
+AC_ARG_ENABLE(blkid,
+[ --enable-blkid=[yes/no] Enable use of block device id library 
[default=yes]],,
+       enable_blkid=yes)
+AC_SUBST(enable_blkid)
+
 AC_ARG_ENABLE(readline,
 [ --enable-readline=[yes/no] Enable readline command editing [default=no]],
        test $enable_readline = yes && libreadline="-lreadline",
@@ -117,9 +122,12 @@ AC_HAVE_PREADV
 AC_HAVE_SYNC_FILE_RANGE
 AC_HAVE_MNTENT
 AC_HAVE_FLS
-AC_HAVE_BLKID_TOPO
 AC_HAVE_READDIR
 
+if test "$enable_blkid" = yes; then
+AC_HAVE_BLKID_TOPO
+fi
+
 AC_CHECK_SIZEOF([long])
 AC_CHECK_SIZEOF([char *])
 AC_TYPE_UMODE_T
diff --git a/include/builddefs.in b/include/builddefs.in
index 8851956..6c16a65 100644
--- a/include/builddefs.in
+++ b/include/builddefs.in
@@ -89,6 +89,7 @@ ENABLE_SHARED = @enable_shared@
 ENABLE_GETTEXT = @enable_gettext@
 ENABLE_EDITLINE        = @enable_editline@
 ENABLE_READLINE        = @enable_readline@
+ENABLE_BLKID   = @enable_blkid@
 
 HAVE_ZIPPED_MANPAGES = @have_zipped_manpages@
 
@@ -138,6 +139,10 @@ endif
 ifeq ($(HAVE_MNTENT),yes)
 PCFLAGS+= -DHAVE_MNTENT
 endif
+ifeq ($(ENABLE_BLKID),yes)
+PCFLAGS+= -DENABLE_BLKID
+endif
+
 
 GCFLAGS = $(OPTIMIZER) $(DEBUG) \
          -DVERSION=\"$(PKG_VERSION)\" -DLOCALEDIR=\"$(PKG_LOCALE_DIR)\"  \
diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index d349b4f..e7bbb10 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -18,7 +18,9 @@
 
 #include "libxfs.h"
 #include <ctype.h>
-#include <blkid/blkid.h>
+#ifdef ENABLE_BLKID
+#  include <blkid/blkid.h>
+#endif /* ENABLE_BLKID */
 #include "xfs_mkfs.h"
 
 /*
@@ -298,6 +300,7 @@ calc_stripe_factors(
  *      0 for nothing found
  *     -1 for internal error
  */
+#ifdef ENABLE_BLKID
 static int
 check_overwrite(
        char            *device)
@@ -451,6 +454,38 @@ out_free_probe:
                _("warning: unable to probe device topology for device %s\n"),
                device);
 }
+#else /* ifdef ENABLE_BLKID */
+/*
+ * Without blkid, we can't do a good check for signatures.
+ * So instead of some messy attempts, just disable any checks
+ * and always return 'nothing found'.
+ */
+#  warning BLKID is disabled, so signature detection and block device\
+ access are not working!
+static int
+check_overwrite(
+       char            *device)
+{
+       return 1;
+}
+
+static void blkid_get_topology(
+       const char      *device,
+       int             *sunit,
+       int             *swidth,
+       int             *lsectorsize,
+       int             *psectorsize,
+       int             force_overwrite)
+{
+       /*
+        * Shouldn't make any difference (no blkid = no block device access),
+        * but make sure this dummy replacement returns with at least some
+        * sanity.
+        */
+       *lsectorsize = *psectorsize = 512;
+}
+
+#endif /* ENABLE_BLKID */
 
 static void get_topology(
        libxfs_init_t           *xi,
-- 
2.4.5