#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 "bisect.h"
static unsigned char (*skipped_sha1)[20];
static int skipped_sha1_nr;
+static int skipped_sha1_alloc;
+
+static const char **rev_argv;
+static int rev_argv_nr;
+static int rev_argv_alloc;
+
+static const unsigned char *current_bad_sha1;
+
+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};
/* bits #0-15 in revision.h */
return best;
}
+static int register_ref(const char *refname, const unsigned char *sha1,
+ int flags, void *cb_data)
+{
+ if (!strcmp(refname, "bad")) {
+ ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
+ current_bad_sha1 = sha1;
+ rev_argv[rev_argv_nr++] = xstrdup(sha1_to_hex(sha1));
+ } else if (!prefixcmp(refname, "good-")) {
+ const char *hex = sha1_to_hex(sha1);
+ char *good = xmalloc(strlen(hex) + 2);
+ *good = '^';
+ memcpy(good + 1, hex, strlen(hex) + 1);
+ ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
+ rev_argv[rev_argv_nr++] = good;
+ } else if (!prefixcmp(refname, "skip-")) {
+ ALLOC_GROW(skipped_sha1, skipped_sha1_nr + 1,
+ skipped_sha1_alloc);
+ hashcpy(skipped_sha1[skipped_sha1_nr++], sha1);
+ }
+
+ return 0;
+}
+
+static int read_bisect_refs(void)
+{
+ return for_each_ref_in("refs/bisect/", register_ref, NULL);
+}
+
+void read_bisect_paths(void)
+{
+ 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));
+
+ while (strbuf_getline(&str, fp, '\n') != EOF) {
+ char *quoted;
+ int res;
+
+ strbuf_trim(&str);
+ quoted = strbuf_detach(&str, NULL);
+ res = sq_dequote_to_argv(quoted, &rev_argv,
+ &rev_argv_nr, &rev_argv_alloc);
+ if (res)
+ die("Badly quoted content in file '%s': %s",
+ filename, quoted);
+ }
+
+ strbuf_release(&str);
+ fclose(fp);
+}
+
static int skipcmp(const void *a, const void *b)
{
return hashcmp(a, b);
qsort(skipped_sha1, skipped_sha1_nr, sizeof(*skipped_sha1), skipcmp);
}
+static const unsigned char *skipped_sha1_access(size_t index, void *table)
+{
+ unsigned char (*skipped)[20] = table;
+ return skipped[index];
+}
+
static int lookup_skipped(unsigned char *sha1)
{
- int lo, hi;
- lo = 0;
- hi = skipped_sha1_nr;
- while (lo < hi) {
- int mi = (lo + hi) / 2;
- int cmp = hashcmp(sha1, skipped_sha1[mi]);
- if (!cmp)
- return mi;
- if (cmp < 0)
- hi = mi;
- else
- lo = mi + 1;
- }
- return -lo - 1;
+ return sha1_pos(sha1, skipped_sha1, skipped_sha1_nr,
+ skipped_sha1_access);
}
struct commit_list *filter_skipped(struct commit_list *list,
return filtered;
}
+
+static void bisect_rev_setup(struct rev_info *revs, const char *prefix)
+{
+ init_revisions(revs, prefix);
+ revs->abbrev = 0;
+ revs->commit_format = CMIT_FMT_UNSPECIFIED;
+
+ /* argv[0] will be ignored by setup_revisions */
+ ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
+ rev_argv[rev_argv_nr++] = xstrdup("bisect_rev_setup");
+
+ if (read_bisect_refs())
+ die("reading bisect refs failed");
+
+ ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
+ rev_argv[rev_argv_nr++] = xstrdup("--");
+
+ read_bisect_paths();
+
+ ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
+ rev_argv[rev_argv_nr++] = NULL;
+
+ setup_revisions(rev_argv_nr, rev_argv, revs, NULL);
+
+ revs->limited = 1;
+}
+
+static void bisect_common(struct rev_info *revs, const char *prefix,
+ int *reaches, int *all)
+{
+ bisect_rev_setup(revs, prefix);
+
+ 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_sha1_nr);
+}
+
+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 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("could not create file '%s': %s",
+ filename, strerror(errno));
+
+ 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 res;
+
+ mark_expected_rev(bisect_rev_hex);
+
+ argv_checkout[2] = bisect_rev_hex;
+ 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);
+}
+
+/*
+ * 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.
+ */
+int bisect_next_exit(const char *prefix)
+{
+ struct rev_info revs;
+ struct commit_list *tried;
+ int reaches = 0, all = 0, nr;
+ const unsigned char *bisect_rev;
+ char bisect_rev_hex[41];
+
+ bisect_common(&revs, prefix, &reaches, &all);
+
+ revs.commits = filter_skipped(revs.commits, &tried, 0);
+
+ 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);
+ }
+
+ 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 first bad commit\n", bisect_rev_hex);
+ argv_diff_tree[2] = bisect_rev_hex;
+ run_command_v_opt(argv_diff_tree, RUN_GIT_CMD);
+ /* This means the bisection process succeeded. */
+ exit(10);
+ }
+
+ nr = all - reaches - 1;
+ printf("Bisecting: %d revisions left to test after this "
+ "(roughly %d steps)\n", nr, estimate_bisect_steps(all));
+
+ return bisect_checkout(bisect_rev_hex);
+}
+