[PATCH 19/26] bisect--helper: `bisect_log` shell function in C

["Pranit Bauva via GitGitGadget" <gitgitgadget@gmail.com>]

From: Pranit Bauva <pranit.bauva@gmail.com>

Reimplement the `bisect_log()` shell function in C and also add
`--bisect-log` subcommand to `git bisect--helper` to call it from
git-bisect.sh .

Using `--bisect-log` subcommand is a temporary measure to port shell
function to C so as to use the existing test suite. As more functions
are ported, this subcommand will be retired and will be called by some
other method.

Mentored-by: Lars Schneider <larsxschneider@gmail.com>
Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Pranit Bauva <pranit.bauva@gmail.com>
Signed-off-by: Tanushree Tumane <tanushreetumane@gmail.com>
---
 builtin/bisect--helper.c | 22 +++++++++++++++++++++-
 git-bisect.sh            |  7 +------
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index d6308cabd2..0a482d67cf 100644
--- a/builtin/bisect--helper.c
+++ b/builtin/bisect--helper.c
@@ -887,6 +887,18 @@ static int bisect_state(struct bisect_terms *terms, const char **argv,
 	return -1;
 }
 
+static int bisect_log(void)
+{
+	int fd, status;
+	fd = open(git_path_bisect_log(), O_RDONLY);
+	if (fd < 0)
+		return -1;
+
+	status = copy_fd(fd, STDOUT_FILENO);
+	close(fd);
+        return status ? -1 : 0;
+}
+
 int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 {
 	enum {
@@ -899,7 +911,8 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 		BISECT_NEXT,
 		BISECT_AUTO_NEXT,
 		BISECT_AUTOSTART,
-		BISECT_STATE
+		BISECT_STATE,
+		BISECT_LOG
 	} cmdmode = 0;
 	int no_checkout = 0, res = 0, nolog = 0;
 	struct option options[] = {
@@ -923,6 +936,8 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 			 N_("start the bisection if BISECT_START is empty or missing"), BISECT_AUTOSTART),
 		OPT_CMDMODE(0, "bisect-state", &cmdmode,
 			 N_("mark the state of ref (or refs)"), BISECT_STATE),
+		OPT_CMDMODE(0, "bisect-log", &cmdmode,
+			 N_("output the contents of BISECT_LOG"), BISECT_LOG),
 		OPT_BOOL(0, "no-checkout", &no_checkout,
 			 N_("update BISECT_HEAD instead of checking out the current commit")),
 		OPT_BOOL(0, "no-log", &nolog,
@@ -995,6 +1010,11 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 		get_terms(&terms);
 		res = bisect_state(&terms, argv, argc);
 		break;
+	case BISECT_LOG:
+		if (argc > 1)
+			return error(_("--bisect-log requires 0 arguments"));
+		res = bisect_log();
+		break;
 	default:
 		return error("BUG: unknown subcommand '%d'", cmdmode);
 	}
diff --git a/git-bisect.sh b/git-bisect.sh
index 4a5afc7a93..151358aeda 100755
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -167,11 +167,6 @@ exit code \$res from '\$command' is < 0 or >= 128" >&2
 	done
 }
 
-bisect_log () {
-	test -s "$GIT_DIR/BISECT_LOG" || die "$(gettext "We are not bisecting.")"
-	cat "$GIT_DIR/BISECT_LOG"
-}
-
 get_terms () {
 	if test -s "$GIT_DIR/BISECT_TERMS"
 	then
@@ -209,7 +204,7 @@ case "$#" in
 	replay)
 		bisect_replay "$@" ;;
 	log)
-		bisect_log ;;
+		git bisect--helper --bisect-log ;;
 	run)
 		bisect_run "$@" ;;
 	terms)
-- 
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