And all functions needed to make it work.
This is a port from the shell function with the same name
"git-bisect.sh". This function is not used yet but it will be used
later.
Signed-off-by: Christian Couder <chriscool@xxxxxxxxxxxxx>
---
bisect.c | 130 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 130 insertions(+), 0 deletions(-)
diff --git a/bisect.c b/bisect.c
index d2a34d1..b24ee78 100644
--- a/bisect.c
+++ b/bisect.c
@@ -507,6 +507,20 @@ static int lookup_sha1_array(struct sha1_array *array,
return sha1_pos(sha1, array->sha1, array->sha1_nr, sha1_access);
}
+static char *join_sha1_array_hex(struct sha1_array *array, char delim)
+{
+ struct strbuf joined_hexs = STRBUF_INIT;
+ int i;
+
+ for (i = 0; i < array->sha1_nr; i++) {
+ strbuf_addstr(&joined_hexs, sha1_to_hex(array->sha1[i]));
+ if (i + 1 < array->sha1_nr)
+ strbuf_addch(&joined_hexs, delim);
+ }
+
+ return strbuf_detach(&joined_hexs, NULL);
+}
+
struct commit_list *filter_skipped(struct commit_list *list,
struct commit_list **tried,
int show_all)
@@ -587,6 +601,30 @@ static void exit_if_skipped_commits(struct commit_list *tried,
exit(2);
}
+static int is_expected_rev(const unsigned char *sha1)
+{
+ const char *filename = git_path("BISECT_EXPECTED_REV");
+ struct stat st;
+ struct strbuf str = STRBUF_INIT;
+ FILE *fp;
+ int res = 0;
+
+ if (stat(filename, &st) || !S_ISREG(st.st_mode))
+ return 0;
+
+ fp = fopen(filename, "r");
+ if (!fp)
+ return 0;
+
+ if (strbuf_getline(&str, fp, '\n') != EOF)
+ res = !strcmp(str.buf, sha1_to_hex(sha1));
+
+ strbuf_release(&str);
+ fclose(fp);
+
+ return res;
+}
+
static void mark_expected_rev(char *bisect_rev_hex)
{
int len = strlen(bisect_rev_hex);
@@ -620,6 +658,98 @@ static int bisect_checkout(char *bisect_rev_hex)
return run_command_v_opt(argv_show_branch, RUN_GIT_CMD);
}
+static struct commit *get_commit_reference(const unsigned char *sha1)
+{
+ struct commit *r = lookup_commit_reference(sha1);
+ if (!r)
+ die("Not a valid commit name %s", sha1_to_hex(sha1));
+ return r;
+}
+
+static struct commit **get_bad_and_good_commits(int *rev_nr)
+{
+ int len = 1 + good_revs.sha1_nr;
+ struct commit **rev = xmalloc(len * sizeof(*rev));
+ int i, n = 0;
+
+ rev[n++] = get_commit_reference(current_bad_sha1);
+ for (i = 0; i < good_revs.sha1_nr; i++)
+ rev[n++] = get_commit_reference(good_revs.sha1[i]);
+ *rev_nr = n;
+
+ return rev;
+}
+
+static void handle_bad_merge_base(void)
+{
+ if (is_expected_rev(current_bad_sha1)) {
+ char *bad_hex = sha1_to_hex(current_bad_sha1);
+ char *good_hex = join_sha1_array_hex(&good_revs, ' ');
+
+ fprintf(stderr, "The merge base %s is bad.\n"
+ "This means the bug has been fixed "
+ "between %s and [%s].\n",
+ bad_hex, bad_hex, good_hex);
+
+ exit(3);
+ }
+
+ fprintf(stderr, "Some good revs are not ancestor of the bad rev.\n"
+ "git bisect cannot work properly in this case.\n"
+ "Maybe you mistake good and bad revs?\n");
+ exit(1);
+}
+
+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);
+ char *good_hex = join_sha1_array_hex(&good_revs, ' ');
+
+ fprintf(stderr, "Warning: the merge base between %s and [%s] "
+ "must be skipped.\n"
+ "So we cannot be sure the first bad commit is "
+ "between %s and %s.\n"
+ "We continue anyway.\n",
+ bad_hex, good_hex, mb_hex, bad_hex);
+ free(good_hex);
+}
+
+/*
+ * "check_merge_bases" checks that merge bases are not "bad".
+ *
+ * - If one is "bad", it means the user assumed something wrong
+ * and we must exit with a non 0 error code.
+ * - If one is "good", that's good, we have nothing to do.
+ * - If one is "skipped", we can't know but we should warn.
+ * - If we don't know, we should check it out and ask the user to test.
+ */
+static void check_merge_bases(void)
+{
+ struct commit_list *result;
+ int rev_nr;
+ struct commit **rev = get_bad_and_good_commits(&rev_nr);
+
+ result = get_merge_bases_many(rev[0], rev_nr - 1, rev + 1, 0);
+
+ for (; result; result = result->next) {
+ const unsigned char *mb = result->item->object.sha1;
+ if (!hashcmp(mb, current_bad_sha1)) {
+ handle_bad_merge_base();
+ } else if (0 <= lookup_sha1_array(&good_revs, mb)) {
+ continue;
+ } else if (0 <= lookup_sha1_array(&skipped_revs, mb)) {
+ handle_skipped_merge_base(mb);
+ } else {
+ printf("Bisecting: a merge base must be tested\n");
+ exit(bisect_checkout(sha1_to_hex(mb)));
+ }
+ }
+
+ free(rev);
+ free_commit_list(result);
+}
+
/*
* We use the convention that exiting with an exit code 10 means that
* the bisection process finished successfully.
--
1.6.3.rc1.112.g17e25
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