futility: add version command

BUG=none
BRANCH=none
TEST=manual

make && ./build/futility/futility version

Change-Id: I362b13d3befba62a33bc9fd2e87ad68f4bc62a84
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/226779
Reviewed-by: Randall Spangler <rspangler@chromium.org>

4 files changed, 49 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 2a3585ce..8dee03ce 100644
--- a/Makefile
+++ b/Makefile
@@ -1052,6 +1052,7 @@ ${FUTIL_CMD_LIST} ${FUTIL_STATIC_CMD_LIST}:
 	${Q}grep -hoRE '^DECLARE_FUTIL_COMMAND\([^,]+' $^ \
 		| sed 's/DECLARE_FUTIL_COMMAND(\(.*\)/_CMD(\1)/' \
 		| sort >>$@_commands
+	${Q}./scripts/getversion.sh >> $@_t
 	${Q}echo '#define _CMD(NAME) extern const struct' \
 		'futil_cmd_t __cmd_##NAME;' >> $@_t
 	${Q}cat $@_commands >> $@_t
diff --git a/futility/futility.c b/futility/futility.c
index b4070618..c74bba61 100644
--- a/futility/futility.c
+++ b/futility/futility.c
@@ -237,6 +237,16 @@ DECLARE_FUTIL_COMMAND(help, do_help,
 		      "Show a bit of help (you're looking at it)",
 		      print_help);
 
+static int do_version(int argc, char *argv[])
+{
+	printf("%s\n", futility_version);
+	return 0;
+}
+
+DECLARE_FUTIL_COMMAND(version, do_version,
+		      "Show the futility source revision and build date",
+		      NULL);
+
 /*
  * These are built-in functions that we'd like to abandon completely someday.
  * TODO: If no one complains, get rid of them.
diff --git a/futility/futility.h b/futility/futility.h
index 52c007cc..652b5fbc 100644
--- a/futility/futility.h
+++ b/futility/futility.h
@@ -14,6 +14,9 @@
 /* This program */
 #define MYNAME "futility"
 
+/* Version string (autogenerated) */
+extern const char futility_version[];
+
 /* Here's a structure to define the commands that futility implements. */
 struct futil_cmd_t {
 	const char *const name;
diff --git a/scripts/getversion.sh b/scripts/getversion.sh
new file mode 100755
index 00000000..b6f2bd4c
--- /dev/null
+++ b/scripts/getversion.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+#
+# Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# Generate version information
+
+if ghash=$(git rev-parse --short --verify HEAD 2>/dev/null); then
+	if gdesc=$(git describe --dirty --match='v*' 2>/dev/null); then
+		IFS="-" fields=($gdesc)
+		tag="${fields[0]}"
+		IFS="." vernum=($tag)
+		numcommits=$((${vernum[2]}+${fields[1]:-0}))
+		ver_major="${vernum[0]}"
+		ver_branch="${vernum[1]}"
+	else
+		numcommits=$(git rev-list HEAD | wc -l)
+		ver_major="v0"
+		ver_branch="0"
+	fi
+	# avoid putting the -dirty attribute if only the timestamp
+	# changed
+	git status > /dev/null 2>&1
+
+	dirty=$(sh -c "[ '$(git diff-index --name-only HEAD)' ] \
+                && echo '-dirty'")
+	ver="${ver_major}.${ver_branch}.${numcommits}-${ghash}${dirty}"
+else
+	ver="unknown"
+fi
+
+date=$(date '+%F %T')
+
+echo "const char futility_version[] = \"${ver} ${date} ${USER}\";";