[PATCH nft] main: add more information to `nft -V`.

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

From: Jeremy Sowden <jeremy@xxxxxxxxxx>

In addition to the package-version and release-name, output the CLI
implementation (if any) and whether mini-gmp was used, e.g.:

    $ ./src/nft -V
    nftables v0.9.3 (Topsy)
      cli:          linenoise
      minigmp:      no

Signed-off-by: Jeremy Sowden <jeremy@xxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
Hi Jeremy et al.

I'm revisiting this one, it's basically your patch with a few mangling.

I wonder if it's probably a good idea to introduce a long version mode.
I have seen other tools providing more verbose information about all
build information.

The idea would be to leave -v/--version as it is, and introduce -V
which would be more verbose.

Thanks.

 src/Makefile.am |  3 +++
 src/main.c      | 32 +++++++++++++++++++++++++++++++-
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/src/Makefile.am b/src/Makefile.am
index 9142ab4484f2..b4b9142bf6b0 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -13,6 +13,9 @@ endif
 if BUILD_XTABLES
 AM_CPPFLAGS += ${XTABLES_CFLAGS}
 endif
+if BUILD_MINIGMP
+AM_CPPFLAGS += -DHAVE_MINIGMP
+endif
 
 AM_CFLAGS = -Wall								\
 	    -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations	\
diff --git a/src/main.c b/src/main.c
index 6ab1b89f4dd5..6a88e777cc1f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -27,6 +27,7 @@ static struct nft_ctx *nft;
 enum opt_vals {
 	OPT_HELP		= 'h',
 	OPT_VERSION		= 'v',
+	OPT_VERSION_LONG	= 'V',
 	OPT_CHECK		= 'c',
 	OPT_FILE		= 'f',
 	OPT_INTERACTIVE		= 'i',
@@ -46,7 +47,7 @@ enum opt_vals {
 	OPT_TERSE		= 't',
 	OPT_INVALID		= '?',
 };
-#define OPTSTRING	"+hvd:cf:iI:jvnsNaeSupypTt"
+#define OPTSTRING	"+hvVd:cf:iI:jvnsNaeSupypTt"
 
 static const struct option options[] = {
 	{
@@ -141,6 +142,7 @@ static void show_help(const char *name)
 "Options:\n"
 "  -h, --help			Show this help\n"
 "  -v, --version			Show version information\n"
+"  -V				Show extended version information\n"
 "\n"
 "  -c, --check			Check commands validity without actually applying the changes.\n"
 "  -f, --file <filename>		Read input from <filename>\n"
@@ -164,6 +166,31 @@ static void show_help(const char *name)
 	name, DEFAULT_INCLUDE_PATH);
 }
 
+static void show_version(void)
+{
+	const char *cli, *minigmp;
+
+#if defined(HAVE_LIBREADLINE)
+	cli = "readline";
+#elif defined(HAVE_LIBLINENOISE)
+	cli = "linenoise";
+#else
+	cli = "no";
+#endif
+
+#if defined(HAVE_MINIGMP)
+	minigmp = "yes";
+#else
+	minigmp = "no";
+#endif
+
+	printf("%s v%s (%s)\n"
+	       "  cli:		%s\n"
+	       "  minigmp:	%s\n",
+	       PACKAGE_NAME, PACKAGE_VERSION, RELEASE_NAME,
+	       cli, minigmp);
+}
+
 static const struct {
 	const char		*name;
 	enum nft_debug_level	level;
@@ -272,6 +299,9 @@ int main(int argc, char * const *argv)
 			printf("%s v%s (%s)\n",
 			       PACKAGE_NAME, PACKAGE_VERSION, RELEASE_NAME);
 			exit(EXIT_SUCCESS);
+		case OPT_VERSION_LONG:
+			show_version();
+			exit(EXIT_SUCCESS);
 		case OPT_CHECK:
 			nft_ctx_set_dry_run(nft, true);
 			break;
-- 
2.11.0