diff options
| -rw-r--r-- | bisect.c | 75 |
1 files changed, 75 insertions, 0 deletions
@@ -751,6 +751,81 @@ static void check_merge_bases(void) } /* + * 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) +{ + struct argv_array rev_argv = { NULL, 0, 0 }; + struct strbuf str = STRBUF_INIT; + int i, result = 0; + struct child_process rls; + FILE *rls_fout; + + 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); + + 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; + } + } + fclose(rls_fout); + finish_command(&rls); + + return result; +} + +/* + * "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) +{ + 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.sha1_nr == 0) + return; + + if (check_ancestors()) + check_merge_bases(); + + /* 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); +} + +/* * 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. |