#include "quote.h"
#include "sha1-lookup.h"
#include "run-command.h"
+#include "log-tree.h"
#include "bisect.h"
struct sha1_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};
return for_each_ref_in("refs/bisect/", register_ref, NULL);
}
-void read_bisect_paths(struct argv_array *array)
+static void read_bisect_paths(struct argv_array *array)
{
struct strbuf str = STRBUF_INIT;
const char *filename = git_path("BISECT_NAMES");
FILE *fp = fopen(filename, "r");
if (!fp)
- die("Could not open file '%s': %s", filename, strerror(errno));
+ die_errno("Could not open file '%s'", filename);
while (strbuf_getline(&str, fp, '\n') != EOF) {
char *quoted;
return strbuf_detach(&joined_hexs, NULL);
}
+/*
+ * In this function, passing a not NULL skipped_first is very special.
+ * It means that we want to know if the first commit in the list is
+ * skipped because we will want to test a commit away from it if it is
+ * indeed skipped.
+ * So if the first commit is skipped, we cannot take the shortcut to
+ * just "return list" when we find the first non skipped commit, we
+ * have to return a fully filtered list.
+ *
+ * We use (*skipped_first == -1) to mean "it has been found that the
+ * first commit is not skipped". In this case *skipped_first is set back
+ * to 0 just before the function returns.
+ */
struct commit_list *filter_skipped(struct commit_list *list,
struct commit_list **tried,
- int show_all)
+ int show_all,
+ int *count,
+ int *skipped_first)
{
struct commit_list *filtered = NULL, **f = &filtered;
*tried = NULL;
+ if (skipped_first)
+ *skipped_first = 0;
+ if (count)
+ *count = 0;
+
if (!skipped_revs.sha1_nr)
return list;
list->next = NULL;
if (0 <= lookup_sha1_array(&skipped_revs,
list->item->object.sha1)) {
+ if (skipped_first && !*skipped_first)
+ *skipped_first = 1;
/* Move current to tried list */
*tried = list;
tried = &list->next;
} else {
- if (!show_all)
- return list;
+ if (!show_all) {
+ if (!skipped_first || !*skipped_first)
+ return list;
+ } else if (skipped_first && !*skipped_first) {
+ /* This means we know it's not skipped */
+ *skipped_first = -1;
+ }
/* Move current to filtered list */
*f = list;
f = &list->next;
+ if (count)
+ (*count)++;
}
list = next;
}
+ if (skipped_first && *skipped_first == -1)
+ *skipped_first = 0;
+
return filtered;
}
-static void bisect_rev_setup(struct rev_info *revs, const char *prefix)
+#define PRN_MODULO 32768
+
+/*
+ * This is a pseudo random number generator based on "man 3 rand".
+ * It is not used properly because the seed is the argument and it
+ * is increased by one between each call, but that should not matter
+ * for this application.
+ */
+int get_prn(int count) {
+ count = count * 1103515245 + 12345;
+ return ((unsigned)(count/65536) % PRN_MODULO);
+}
+
+/*
+ * Custom integer square root from
+ * http://en.wikipedia.org/wiki/Integer_square_root
+ */
+static int sqrti(int val)
+{
+ float d, x = val;
+
+ if (val == 0)
+ return 0;
+
+ do {
+ float y = (x + (float)val / x) / 2;
+ d = (y > x) ? y - x : x - y;
+ x = y;
+ } while (d >= 0.5);
+
+ return (int)x;
+}
+
+static struct commit_list *skip_away(struct commit_list *list, int count)
+{
+ struct commit_list *cur, *previous;
+ int prn, index, i;
+
+ prn = get_prn(count);
+ index = (count * prn / PRN_MODULO) * sqrti(prn) / sqrti(PRN_MODULO);
+
+ cur = list;
+ previous = NULL;
+
+ for (i = 0; cur; cur = cur->next, i++) {
+ if (i == index) {
+ if (hashcmp(cur->item->object.sha1, current_bad_sha1))
+ return cur;
+ if (previous)
+ return previous;
+ return list;
+ }
+ previous = cur;
+ }
+
+ return list;
+}
+
+static struct commit_list *managed_skipped(struct commit_list *list,
+ struct commit_list **tried)
+{
+ int count, skipped_first;
+
+ *tried = NULL;
+
+ if (!skipped_revs.sha1_nr)
+ return list;
+
+ list = filter_skipped(list, tried, 0, &count, &skipped_first);
+
+ if (!skipped_first)
+ return list;
+
+ return skip_away(list, count);
+}
+
+static void bisect_rev_setup(struct rev_info *revs, const char *prefix,
+ const char *bad_format, const char *good_format,
+ int read_paths)
{
struct argv_array rev_argv = { NULL, 0, 0 };
int i;
/* rev_argv.argv[0] will be ignored by setup_revisions */
argv_array_push(&rev_argv, xstrdup("bisect_rev_setup"));
- argv_array_push_sha1(&rev_argv, current_bad_sha1, "%s");
+ argv_array_push_sha1(&rev_argv, current_bad_sha1, bad_format);
for (i = 0; i < good_revs.sha1_nr; i++)
- argv_array_push_sha1(&rev_argv, good_revs.sha1[i], "^%s");
+ argv_array_push_sha1(&rev_argv, good_revs.sha1[i],
+ good_format);
argv_array_push(&rev_argv, xstrdup("--"));
- read_bisect_paths(&rev_argv);
+ if (read_paths)
+ read_bisect_paths(&rev_argv);
argv_array_push(&rev_argv, NULL);
setup_revisions(rev_argv.argv_nr, rev_argv.argv, revs, NULL);
- revs->limited = 1;
}
-static void bisect_common(struct rev_info *revs, int *reaches, int *all)
+static void bisect_common(struct rev_info *revs)
{
if (prepare_revision_walk(revs))
die("revision walk setup failed");
if (revs->tree_objects)
mark_edges_uninteresting(revs->commits, revs, NULL);
-
- revs->commits = find_bisection(revs->commits, reaches, all,
- !!skipped_revs.sha1_nr);
}
static void exit_if_skipped_commits(struct commit_list *tried,
int fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0600);
if (fd < 0)
- die("could not create file '%s': %s",
- filename, strerror(errno));
+ die_errno("could not create file '%s'", filename);
bisect_rev_hex[len] = '\n';
write_or_die(fd, bisect_rev_hex, len + 1);
exit(1);
}
-void handle_skipped_merge_base(const unsigned char *mb)
+static void handle_skipped_merge_base(const unsigned char *mb)
{
char *mb_hex = sha1_to_hex(mb);
char *bad_hex = sha1_to_hex(current_bad_sha1);
free_commit_list(result);
}
-/*
- * This function runs the command "git rev-list $_good ^$_bad"
- * and returns 1 if it produces some output, 0 otherwise.
- */
-static int check_ancestors(void)
+static int check_ancestors(const char *prefix)
{
- struct argv_array rev_argv = { NULL, 0, 0 };
- struct strbuf str = STRBUF_INIT;
- int i, result = 0;
- struct child_process rls;
- FILE *rls_fout;
+ struct rev_info revs;
+ struct object_array pending_copy;
+ int i, res;
- argv_array_push(&rev_argv, xstrdup("rev-list"));
- argv_array_push_sha1(&rev_argv, current_bad_sha1, "^%s");
- for (i = 0; i < good_revs.sha1_nr; i++)
- argv_array_push_sha1(&rev_argv, good_revs.sha1[i], "%s");
- argv_array_push(&rev_argv, NULL);
+ bisect_rev_setup(&revs, prefix, "^%s", "%s", 0);
- memset(&rls, 0, sizeof(rls));
- rls.argv = rev_argv.argv;
- rls.out = -1;
- rls.git_cmd = 1;
- if (start_command(&rls))
- die("Could not launch 'git rev-list' command.");
- rls_fout = fdopen(rls.out, "r");
- while (strbuf_getline(&str, rls_fout, '\n') != EOF) {
- strbuf_trim(&str);
- if (*str.buf) {
- result = 1;
- break;
- }
+ /* Save pending objects, so they can be cleaned up later. */
+ memset(&pending_copy, 0, sizeof(pending_copy));
+ for (i = 0; i < revs.pending.nr; i++)
+ add_object_array(revs.pending.objects[i].item,
+ revs.pending.objects[i].name,
+ &pending_copy);
+
+ bisect_common(&revs);
+ res = (revs.commits != NULL);
+
+ /* Clean up objects used, as they will be reused. */
+ for (i = 0; i < pending_copy.nr; i++) {
+ struct object *o = pending_copy.objects[i].item;
+ clear_commit_marks((struct commit *)o, ALL_REV_FLAGS);
}
- fclose(rls_fout);
- finish_command(&rls);
- return result;
+ return res;
}
/*
if (good_revs.sha1_nr == 0)
return;
- if (check_ancestors())
+ /* Check if all good revs are ancestor of the bad rev. */
+ if (check_ancestors(prefix))
check_merge_bases();
/* Create file BISECT_ANCESTORS_OK. */
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.
check_good_are_ancestors_of_bad(prefix);
- bisect_rev_setup(&revs, prefix);
+ bisect_rev_setup(&revs, prefix, "%s", "^%s", 1);
+ revs.limited = 1;
- bisect_common(&revs, &reaches, &all);
+ bisect_common(&revs);
- revs.commits = filter_skipped(revs.commits, &tried, 0);
+ revs.commits = find_bisection(revs.commits, &reaches, &all,
+ !!skipped_revs.sha1_nr);
+ revs.commits = managed_skipped(revs.commits, &tried);
if (!revs.commits) {
/*
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);
}