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bisect: display first bad commit without forking a new process

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Previously "git diff-tree --pretty COMMIT" was run using
"run_command_v_opt" to display information about the first bad
commit.

The goal of this patch is to avoid a "fork" and an "exec" call
when displaying that information.

To do that, we manually setup revision information as
"git diff-tree --pretty" would do it, and then use the
"log_tree_commit" function.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Christian Couder 2009-05-28 23:21:16 +02:00 committed by Junio C Hamano
parent 7a8e3895f6
commit e22278c0a0
1 changed files with 27 additions and 3 deletions
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30
bisect.c
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@ -7,6 +7,7 @@
#include "quote.h"
#include "sha1-lookup.h"
#include "run-command.h"
#include "log-tree.h"
#include "bisect.h"
struct sha1_array {
@ -27,7 +28,6 @@ struct argv_array {
int argv_alloc;
};
static const char *argv_diff_tree[] = {"diff-tree", "--pretty", NULL, NULL};
static const char *argv_checkout[] = {"checkout", "-q", NULL, "--", NULL};
static const char *argv_show_branch[] = {"show-branch", NULL, NULL};
@ -815,6 +815,31 @@ static void check_good_are_ancestors_of_bad(const char *prefix)
close(fd);
}
/*
* This does "git diff-tree --pretty COMMIT" without one fork+exec.
*/
static void show_diff_tree(const char *prefix, struct commit *commit)
{
struct rev_info opt;
/* diff-tree init */
init_revisions(&opt, prefix);
git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
opt.abbrev = 0;
opt.diff = 1;
/* This is what "--pretty" does */
opt.verbose_header = 1;
opt.use_terminator = 0;
opt.commit_format = CMIT_FMT_DEFAULT;
/* diff-tree init */
if (!opt.diffopt.output_format)
opt.diffopt.output_format = DIFF_FORMAT_RAW;
log_tree_commit(&opt, commit);
}
/*
* We use the convention that exiting with an exit code 10 means that
* the bisection process finished successfully.
@ -860,8 +885,7 @@ int bisect_next_all(const char *prefix)
if (!hashcmp(bisect_rev, current_bad_sha1)) {
exit_if_skipped_commits(tried, current_bad_sha1);
printf("%s is first bad commit\n", bisect_rev_hex);
argv_diff_tree[2] = bisect_rev_hex;
run_command_v_opt(argv_diff_tree, RUN_GIT_CMD);
show_diff_tree(prefix, revs.commits->item);
/* This means the bisection process succeeded. */
exit(10);
}