Add a --version argument that also outputs features

And use it in the tests to skip libarchive tests when the build
doesn't support it.

Makefile.am

@@ -17,6 +17,7 @@
 
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 AM_CPPFLAGS = -DDATADIR='"$(datadir)"' -DLIBEXECDIR='"$(libexecdir)"' \
+	-DOSTREE_FEATURES='"$(OSTREE_FEATURES)"' \
 	-DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_34 -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_34 \
 	-DSOUP_VERSION_MIN_REQUIRED=SOUP_VERSION_2_40 -DSOUP_VERSION_MAX_ALLOWED=SOUP_VERSION_40
 AM_CFLAGS = $(WARN_CFLAGS)

configure.ac

@@ -28,6 +28,9 @@ AC_SUBST(WARN_CFLAGS)
 LT_PREREQ([2.2.4])
 LT_INIT([disable-static])
 
+OSTREE_FEATURES=""
+AC_SUBST([OSTREE_FEATURES])
+
 AC_ARG_ENABLE(triggers-only,
 	    AS_HELP_STRING([--enable-triggers-only], [Only build and install triggers]),,
 	    enable_triggers_only=no)
@@ -70,12 +73,14 @@ AS_IF([test x$enable_embedded_dependencies = xyes], [
     ])
     AS_IF([test x$have_soup = xyes], [
 	PKG_CHECK_MODULES(OT_DEP_SOUP, $SOUP_DEPENDENCY)
+        AC_DEFINE(HAVE_LIBSOUP, 1, [Define if we have libsoup.pc])
 	with_soup=yes
     ], [
 	with_soup=no
     ])
   ], [ with_soup=no ])
 ])
+if test x$with_soup != xno; then OSTREE_FEATURES="$OSTREE_FEATURES +libsoup"; fi
 AM_CONDITIONAL(USE_LIBSOUP, test x$with_soup != xno)
 
 LIBARCHIVE_DEPENDENCY="libarchive >= 2.8.0"
@@ -117,6 +122,7 @@ AS_IF([ test x$with_libarchive != xno ], [
 	with_libarchive=no
     ])
 ], [ with_libarchive=no ])
+if test x$with_libarchive != xno; then OSTREE_FEATURES="$OSTREE_FEATURES +libarchive"; fi
 AM_CONDITIONAL(USE_LIBARCHIVE, test $with_libarchive != no)
 
 AS_IF([test x$cross_compiling != xyes && test -d /etc/kernel && test x$enable_triggers_only != xyes ],

src/ostree/ot-main.c

@@ -29,6 +29,13 @@
 #include "ot-main.h"
 #include "otutil.h"
 
+static gboolean opt_version;
+
+static GOptionEntry main_options[] = {
+  { "version", 0, 0, G_OPTION_ARG_NONE, &opt_version, "Display version", NULL },
+  { NULL }
+};
+
 int
 ostree_usage (char **argv,
               OstreeCommand *commands,
@@ -80,6 +87,7 @@ ostree_run (int    argc,
             OstreeCommand *commands,
             GError **res_error)
 {
+  GOptionContext *optcontext;
   OstreeCommand *command;
   GError *error = NULL;
   int cmd_argc;
@@ -104,6 +112,19 @@ ostree_run (int    argc,
   if (argc < 2)
     return ostree_usage (argv, commands, TRUE);
 
+  optcontext = g_option_context_new ("COMMAND [OPTIONS...]");
+  g_option_context_add_main_entries (optcontext, main_options, NULL);
+  g_option_context_set_ignore_unknown_options (optcontext, TRUE);
+
+  if (!g_option_context_parse (optcontext, &argc, &argv, &error))
+    goto out;
+
+  if (opt_version)
+    {
+      g_print ("%s\n  %s\n", PACKAGE_STRING, OSTREE_FEATURES);
+      return 0;
+    }
+
   have_repo_arg = g_str_has_prefix (argv[1], "--repo=");
 
   if (have_repo_arg)

tests/t0006-libarchive.sh

@@ -19,6 +19,10 @@
 
 set -e
 
+if ! ostree --version | grep -q -e '\+libarchive'; then
+    exit 77
+fi
+
 echo "1..7"
 
 . $(dirname $0)/libtest.sh