diff options
Diffstat (limited to 'bisect.c')
| -rw-r--r-- | bisect.c | 956 |
1 files changed, 956 insertions, 0 deletions
diff --git a/bisect.c b/bisect.c new file mode 100644 index 0000000000..6e186e29cc --- /dev/null +++ b/bisect.c @@ -0,0 +1,956 @@ +#include "cache.h" +#include "commit.h" +#include "diff.h" +#include "revision.h" +#include "refs.h" +#include "list-objects.h" +#include "quote.h" +#include "sha1-lookup.h" +#include "run-command.h" +#include "log-tree.h" +#include "bisect.h" +#include "sha1-array.h" +#include "argv-array.h" + +static struct sha1_array good_revs; +static struct sha1_array skipped_revs; + +static const unsigned char *current_bad_sha1; + +static const char *argv_checkout[] = {"checkout", "-q", NULL, "--", NULL}; +static const char *argv_show_branch[] = {"show-branch", NULL, NULL}; +static const char *argv_update_ref[] = {"update-ref", "--no-deref", "BISECT_HEAD", NULL, NULL}; + +/* bits #0-15 in revision.h */ + +#define COUNTED (1u<<16) + +/* + * This is a truly stupid algorithm, but it's only + * used for bisection, and we just don't care enough. + * + * We care just barely enough to avoid recursing for + * non-merge entries. + */ +static int count_distance(struct commit_list *entry) +{ + int nr = 0; + + while (entry) { + struct commit *commit = entry->item; + struct commit_list *p; + + if (commit->object.flags & (UNINTERESTING | COUNTED)) + break; + if (!(commit->object.flags & TREESAME)) + nr++; + commit->object.flags |= COUNTED; + p = commit->parents; + entry = p; + if (p) { + p = p->next; + while (p) { + nr += count_distance(p); + p = p->next; + } + } + } + + return nr; +} + +static void clear_distance(struct commit_list *list) +{ + while (list) { + struct commit *commit = list->item; + commit->object.flags &= ~COUNTED; + list = list->next; + } +} + +#define DEBUG_BISECT 0 + +static inline int weight(struct commit_list *elem) +{ + return *((int*)(elem->item->util)); +} + +static inline void weight_set(struct commit_list *elem, int weight) +{ + *((int*)(elem->item->util)) = weight; +} + +static int count_interesting_parents(struct commit *commit) +{ + struct commit_list *p; + int count; + + for (count = 0, p = commit->parents; p; p = p->next) { + if (p->item->object.flags & UNINTERESTING) + continue; + count++; + } + return count; +} + +static inline int halfway(struct commit_list *p, int nr) +{ + /* + * Don't short-cut something we are not going to return! + */ + if (p->item->object.flags & TREESAME) + return 0; + if (DEBUG_BISECT) + return 0; + /* + * 2 and 3 are halfway of 5. + * 3 is halfway of 6 but 2 and 4 are not. + */ + switch (2 * weight(p) - nr) { + case -1: case 0: case 1: + return 1; + default: + return 0; + } +} + +#if !DEBUG_BISECT +#define show_list(a,b,c,d) do { ; } while (0) +#else +static void show_list(const char *debug, int counted, int nr, + struct commit_list *list) +{ + struct commit_list *p; + + fprintf(stderr, "%s (%d/%d)\n", debug, counted, nr); + + for (p = list; p; p = p->next) { + struct commit_list *pp; + struct commit *commit = p->item; + unsigned flags = commit->object.flags; + enum object_type type; + unsigned long size; + char *buf = read_sha1_file(commit->object.sha1, &type, &size); + const char *subject_start; + int subject_len; + + fprintf(stderr, "%c%c%c ", + (flags & TREESAME) ? ' ' : 'T', + (flags & UNINTERESTING) ? 'U' : ' ', + (flags & COUNTED) ? 'C' : ' '); + if (commit->util) + fprintf(stderr, "%3d", weight(p)); + else + fprintf(stderr, "---"); + fprintf(stderr, " %.*s", 8, sha1_to_hex(commit->object.sha1)); + for (pp = commit->parents; pp; pp = pp->next) + fprintf(stderr, " %.*s", 8, + sha1_to_hex(pp->item->object.sha1)); + + subject_len = find_commit_subject(buf, &subject_start); + if (subject_len) + fprintf(stderr, " %.*s", subject_len, subject_start); + fprintf(stderr, "\n"); + } +} +#endif /* DEBUG_BISECT */ + +static struct commit_list *best_bisection(struct commit_list *list, int nr) +{ + struct commit_list *p, *best; + int best_distance = -1; + + best = list; + for (p = list; p; p = p->next) { + int distance; + unsigned flags = p->item->object.flags; + + if (flags & TREESAME) + continue; + distance = weight(p); + if (nr - distance < distance) + distance = nr - distance; + if (distance > best_distance) { + best = p; + best_distance = distance; + } + } + + return best; +} + +struct commit_dist { + struct commit *commit; + int distance; +}; + +static int compare_commit_dist(const void *a_, const void *b_) +{ + struct commit_dist *a, *b; + + a = (struct commit_dist *)a_; + b = (struct commit_dist *)b_; + if (a->distance != b->distance) + return b->distance - a->distance; /* desc sort */ + return hashcmp(a->commit->object.sha1, b->commit->object.sha1); +} + +static struct commit_list *best_bisection_sorted(struct commit_list *list, int nr) +{ + struct commit_list *p; + struct commit_dist *array = xcalloc(nr, sizeof(*array)); + int cnt, i; + + for (p = list, cnt = 0; p; p = p->next) { + int distance; + unsigned flags = p->item->object.flags; + + if (flags & TREESAME) + continue; + distance = weight(p); + if (nr - distance < distance) + distance = nr - distance; + array[cnt].commit = p->item; + array[cnt].distance = distance; + cnt++; + } + qsort(array, cnt, sizeof(*array), compare_commit_dist); + for (p = list, i = 0; i < cnt; i++) { + struct name_decoration *r = xmalloc(sizeof(*r) + 100); + struct object *obj = &(array[i].commit->object); + + sprintf(r->name, "dist=%d", array[i].distance); + r->next = add_decoration(&name_decoration, obj, r); + p->item = array[i].commit; + p = p->next; + } + if (p) + p->next = NULL; + free(array); + return list; +} + +/* + * zero or positive weight is the number of interesting commits it can + * reach, including itself. Especially, weight = 0 means it does not + * reach any tree-changing commits (e.g. just above uninteresting one + * but traversal is with pathspec). + * + * weight = -1 means it has one parent and its distance is yet to + * be computed. + * + * weight = -2 means it has more than one parent and its distance is + * unknown. After running count_distance() first, they will get zero + * or positive distance. + */ +static struct commit_list *do_find_bisection(struct commit_list *list, + int nr, int *weights, + int find_all) +{ + int n, counted; + struct commit_list *p; + + counted = 0; + + for (n = 0, p = list; p; p = p->next) { + struct commit *commit = p->item; + unsigned flags = commit->object.flags; + + p->item->util = &weights[n++]; + switch (count_interesting_parents(commit)) { + case 0: + if (!(flags & TREESAME)) { + weight_set(p, 1); + counted++; + show_list("bisection 2 count one", + counted, nr, list); + } + /* + * otherwise, it is known not to reach any + * tree-changing commit and gets weight 0. + */ + break; + case 1: + weight_set(p, -1); + break; + default: + weight_set(p, -2); + break; + } + } + + show_list("bisection 2 initialize", counted, nr, list); + + /* + * If you have only one parent in the resulting set + * then you can reach one commit more than that parent + * can reach. So we do not have to run the expensive + * count_distance() for single strand of pearls. + * + * However, if you have more than one parents, you cannot + * just add their distance and one for yourself, since + * they usually reach the same ancestor and you would + * end up counting them twice that way. + * + * So we will first count distance of merges the usual + * way, and then fill the blanks using cheaper algorithm. + */ + for (p = list; p; p = p->next) { + if (p->item->object.flags & UNINTERESTING) + continue; + if (weight(p) != -2) + continue; + weight_set(p, count_distance(p)); + clear_distance(list); + + /* Does it happen to be at exactly half-way? */ + if (!find_all && halfway(p, nr)) + return p; + counted++; + } + + show_list("bisection 2 count_distance", counted, nr, list); + + while (counted < nr) { + for (p = list; p; p = p->next) { + struct commit_list *q; + unsigned flags = p->item->object.flags; + + if (0 <= weight(p)) + continue; + for (q = p->item->parents; q; q = q->next) { + if (q->item->object.flags & UNINTERESTING) + continue; + if (0 <= weight(q)) + break; + } + if (!q) + continue; + + /* + * weight for p is unknown but q is known. + * add one for p itself if p is to be counted, + * otherwise inherit it from q directly. + */ + if (!(flags & TREESAME)) { + weight_set(p, weight(q)+1); + counted++; + show_list("bisection 2 count one", + counted, nr, list); + } + else + weight_set(p, weight(q)); + + /* Does it happen to be at exactly half-way? */ + if (!find_all && halfway(p, nr)) + return p; + } + } + + show_list("bisection 2 counted all", counted, nr, list); + + if (!find_all) + return best_bisection(list, nr); + else + return best_bisection_sorted(list, nr); +} + +struct commit_list *find_bisection(struct commit_list *list, + int *reaches, int *all, + int find_all) +{ + int nr, on_list; + struct commit_list *p, *best, *next, *last; + int *weights; + + show_list("bisection 2 entry", 0, 0, list); + + /* + * Count the number of total and tree-changing items on the + * list, while reversing the list. + */ + for (nr = on_list = 0, last = NULL, p = list; + p; + p = next) { + unsigned flags = p->item->object.flags; + + next = p->next; + if (flags & UNINTERESTING) + continue; + p->next = last; + last = p; + if (!(flags & TREESAME)) + nr++; + on_list++; + } + list = last; + show_list("bisection 2 sorted", 0, nr, list); + + *all = nr; + weights = xcalloc(on_list, sizeof(*weights)); + + /* Do the real work of finding bisection commit. */ + best = do_find_bisection(list, nr, weights, find_all); + if (best) { + if (!find_all) + best->next = NULL; + *reaches = weight(best); + } + free(weights); + return best; +} + +static int register_ref(const char *refname, const unsigned char *sha1, + int flags, void *cb_data) +{ + if (!strcmp(refname, "bad")) { + current_bad_sha1 = sha1; + } else if (!prefixcmp(refname, "good-")) { + sha1_array_append(&good_revs, sha1); + } else if (!prefixcmp(refname, "skip-")) { + sha1_array_append(&skipped_revs, sha1); + } + + return 0; +} + +static int read_bisect_refs(void) +{ + return for_each_ref_in("refs/bisect/", register_ref, NULL); +} + +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_errno("Could not open file '%s'", filename); + + while (strbuf_getline(&str, fp, '\n') != EOF) { + strbuf_trim(&str); + if (sq_dequote_to_argv_array(str.buf, array)) + die("Badly quoted content in file '%s': %s", + filename, str.buf); + } + + strbuf_release(&str); + fclose(fp); +} + +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->nr; i++) { + strbuf_addstr(&joined_hexs, sha1_to_hex(array->sha1[i])); + if (i + 1 < array->nr) + strbuf_addch(&joined_hexs, delim); + } + + 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 *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.nr) + return list; + + while (list) { + struct commit_list *next = list->next; + list->next = NULL; + if (0 <= sha1_array_lookup(&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) { + 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; +} + +#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. + */ +static 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.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 = ARGV_ARRAY_INIT; + int i; + + init_revisions(revs, prefix); + revs->abbrev = 0; + revs->commit_format = CMIT_FMT_UNSPECIFIED; + + /* rev_argv.argv[0] will be ignored by setup_revisions */ + argv_array_push(&rev_argv, "bisect_rev_setup"); + argv_array_pushf(&rev_argv, bad_format, sha1_to_hex(current_bad_sha1)); + for (i = 0; i < good_revs.nr; i++) + argv_array_pushf(&rev_argv, good_format, + sha1_to_hex(good_revs.sha1[i])); + argv_array_push(&rev_argv, "--"); + if (read_paths) + read_bisect_paths(&rev_argv); + + setup_revisions(rev_argv.argc, rev_argv.argv, revs, NULL); + /* XXX leak rev_argv, as "revs" may still be pointing to it */ +} + +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); +} + +static void exit_if_skipped_commits(struct commit_list *tried, + const unsigned char *bad) +{ + if (!tried) + return; + + printf("There are only 'skip'ped commits left to test.\n" + "The first bad commit could be any of:\n"); + print_commit_list(tried, "%s\n", "%s\n"); + if (bad) + printf("%s\n", sha1_to_hex(bad)); + printf("We cannot bisect more!\n"); + 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); + const char *filename = git_path("BISECT_EXPECTED_REV"); + int fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0600); + + if (fd < 0) + die_errno("could not create file '%s'", filename); + + bisect_rev_hex[len] = '\n'; + write_or_die(fd, bisect_rev_hex, len + 1); + bisect_rev_hex[len] = '\0'; + + if (close(fd) < 0) + die("closing file %s: %s", filename, strerror(errno)); +} + +static int bisect_checkout(char *bisect_rev_hex, int no_checkout) +{ + int res; + + mark_expected_rev(bisect_rev_hex); + + argv_checkout[2] = bisect_rev_hex; + if (no_checkout) { + argv_update_ref[3] = bisect_rev_hex; + if (run_command_v_opt(argv_update_ref, RUN_GIT_CMD)) + die("update-ref --no-deref HEAD failed on %s", + bisect_rev_hex); + } else { + res = run_command_v_opt(argv_checkout, RUN_GIT_CMD); + if (res) + exit(res); + } + + argv_show_branch[1] = 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.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.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); +} + +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); + char *good_hex = join_sha1_array_hex(&good_revs, ' '); + + 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.", + 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(int no_checkout) +{ + 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 <= sha1_array_lookup(&good_revs, mb)) { + continue; + } else if (0 <= sha1_array_lookup(&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), no_checkout)); + } + } + + free(rev); + free_commit_list(result); +} + +static int check_ancestors(const char *prefix) +{ + struct rev_info revs; + struct object_array pending_copy; + int res; + + bisect_rev_setup(&revs, prefix, "^%s", "%s", 0); + + /* Save pending objects, so they can be cleaned up later. */ + pending_copy = revs.pending; + revs.leak_pending = 1; + + /* + * bisect_common calls prepare_revision_walk right away, which + * (together with .leak_pending = 1) makes us the sole owner of + * the list of pending objects. + */ + bisect_common(&revs); + res = (revs.commits != NULL); + + /* Clean up objects used, as they will be reused. */ + clear_commit_marks_for_object_array(&pending_copy, ALL_REV_FLAGS); + free(pending_copy.objects); + + return res; +} + +/* + * "check_good_are_ancestors_of_bad" checks that all "good" revs are + * ancestor of the "bad" rev. + * + * If that's not the case, we need to check the merge bases. + * If a merge base must be tested by the user, its source code will be + * checked out to be tested by the user and we will exit. + */ +static void check_good_are_ancestors_of_bad(const char *prefix, int no_checkout) +{ + const char *filename = git_path("BISECT_ANCESTORS_OK"); + struct stat st; + int fd; + + if (!current_bad_sha1) + die("a bad revision is needed"); + + /* Check if file BISECT_ANCESTORS_OK exists. */ + if (!stat(filename, &st) && S_ISREG(st.st_mode)) + return; + + /* Bisecting with no good rev is ok. */ + if (good_revs.nr == 0) + return; + + /* Check if all good revs are ancestor of the bad rev. */ + if (check_ancestors(prefix)) + check_merge_bases(no_checkout); + + /* Create file BISECT_ANCESTORS_OK. */ + fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0600); + if (fd < 0) + warning("could not create file '%s': %s", + filename, strerror(errno)); + else + 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. + * In this case the calling shell script should exit 0. + * + * If no_checkout is non-zero, the bisection process does not + * checkout the trial commit but instead simply updates BISECT_HEAD. + */ +int bisect_next_all(const char *prefix, int no_checkout) +{ + struct rev_info revs; + struct commit_list *tried; + int reaches = 0, all = 0, nr, steps; + const unsigned char *bisect_rev; + char bisect_rev_hex[41]; + + if (read_bisect_refs()) + die("reading bisect refs failed"); + + check_good_are_ancestors_of_bad(prefix, no_checkout); + + bisect_rev_setup(&revs, prefix, "%s", "^%s", 1); + revs.limited = 1; + + bisect_common(&revs); + + revs.commits = find_bisection(revs.commits, &reaches, &all, + !!skipped_revs.nr); + revs.commits = managed_skipped(revs.commits, &tried); + + if (!revs.commits) { + /* + * We should exit here only if the "bad" + * commit is also a "skip" commit. + */ + exit_if_skipped_commits(tried, NULL); + + printf("%s was both good and bad\n", + sha1_to_hex(current_bad_sha1)); + exit(1); + } + + if (!all) { + fprintf(stderr, "No testable commit found.\n" + "Maybe you started with bad path parameters?\n"); + exit(4); + } + + bisect_rev = revs.commits->item->object.sha1; + memcpy(bisect_rev_hex, sha1_to_hex(bisect_rev), 41); + + if (!hashcmp(bisect_rev, current_bad_sha1)) { + exit_if_skipped_commits(tried, current_bad_sha1); + printf("%s is the first bad commit\n", bisect_rev_hex); + show_diff_tree(prefix, revs.commits->item); + /* This means the bisection process succeeded. */ + exit(10); + } + + nr = all - reaches - 1; + steps = estimate_bisect_steps(all); + printf("Bisecting: %d revision%s left to test after this " + "(roughly %d step%s)\n", nr, (nr == 1 ? "" : "s"), + steps, (steps == 1 ? "" : "s")); + + return bisect_checkout(bisect_rev_hex, no_checkout); +} + |