sha1-name.c: remove implicit dependency on the_index
[gitweb.git] / builtin / bisect--helper.c
index 3324229025300f7d7de600753c03af3ac22e2152..417d141c09ad2698c17cf4738ad6ce7177456088 100644 (file)
 #include "cache.h"
 #include "parse-options.h"
 #include "bisect.h"
+#include "refs.h"
+
+static GIT_PATH_FUNC(git_path_bisect_terms, "BISECT_TERMS")
+static GIT_PATH_FUNC(git_path_bisect_expected_rev, "BISECT_EXPECTED_REV")
+static GIT_PATH_FUNC(git_path_bisect_ancestors_ok, "BISECT_ANCESTORS_OK")
 
 static const char * const git_bisect_helper_usage[] = {
        N_("git bisect--helper --next-all [--no-checkout]"),
+       N_("git bisect--helper --write-terms <bad_term> <good_term>"),
+       N_("git bisect--helper --bisect-clean-state"),
        NULL
 };
 
+/*
+ * Check whether the string `term` belongs to the set of strings
+ * included in the variable arguments.
+ */
+LAST_ARG_MUST_BE_NULL
+static int one_of(const char *term, ...)
+{
+       int res = 0;
+       va_list matches;
+       const char *match;
+
+       va_start(matches, term);
+       while (!res && (match = va_arg(matches, const char *)))
+               res = !strcmp(term, match);
+       va_end(matches);
+
+       return res;
+}
+
+static int check_term_format(const char *term, const char *orig_term)
+{
+       int res;
+       char *new_term = xstrfmt("refs/bisect/%s", term);
+
+       res = check_refname_format(new_term, 0);
+       free(new_term);
+
+       if (res)
+               return error(_("'%s' is not a valid term"), term);
+
+       if (one_of(term, "help", "start", "skip", "next", "reset",
+                       "visualize", "view", "replay", "log", "run", "terms", NULL))
+               return error(_("can't use the builtin command '%s' as a term"), term);
+
+       /*
+        * In theory, nothing prevents swapping completely good and bad,
+        * but this situation could be confusing and hasn't been tested
+        * enough. Forbid it for now.
+        */
+
+       if ((strcmp(orig_term, "bad") && one_of(term, "bad", "new", NULL)) ||
+                (strcmp(orig_term, "good") && one_of(term, "good", "old", NULL)))
+               return error(_("can't change the meaning of the term '%s'"), term);
+
+       return 0;
+}
+
+static int write_terms(const char *bad, const char *good)
+{
+       FILE *fp = NULL;
+       int res;
+
+       if (!strcmp(bad, good))
+               return error(_("please use two different terms"));
+
+       if (check_term_format(bad, "bad") || check_term_format(good, "good"))
+               return -1;
+
+       fp = fopen(git_path_bisect_terms(), "w");
+       if (!fp)
+               return error_errno(_("could not open the file BISECT_TERMS"));
+
+       res = fprintf(fp, "%s\n%s\n", bad, good);
+       res |= fclose(fp);
+       return (res < 0) ? -1 : 0;
+}
+
+static int is_expected_rev(const char *expected_hex)
+{
+       struct strbuf actual_hex = STRBUF_INIT;
+       int res = 0;
+       if (strbuf_read_file(&actual_hex, git_path_bisect_expected_rev(), 0) >= 40) {
+               strbuf_trim(&actual_hex);
+               res = !strcmp(actual_hex.buf, expected_hex);
+       }
+       strbuf_release(&actual_hex);
+       return res;
+}
+
+static void check_expected_revs(const char **revs, int rev_nr)
+{
+       int i;
+
+       for (i = 0; i < rev_nr; i++) {
+               if (!is_expected_rev(revs[i])) {
+                       unlink_or_warn(git_path_bisect_ancestors_ok());
+                       unlink_or_warn(git_path_bisect_expected_rev());
+               }
+       }
+}
+
 int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 {
-       int next_all = 0;
+       enum {
+               NEXT_ALL = 1,
+               WRITE_TERMS,
+               BISECT_CLEAN_STATE,
+               CHECK_EXPECTED_REVS
+       } cmdmode = 0;
        int no_checkout = 0;
        struct option options[] = {
-               OPT_BOOL(0, "next-all", &next_all,
-                        N_("perform 'git bisect next'")),
+               OPT_CMDMODE(0, "next-all", &cmdmode,
+                        N_("perform 'git bisect next'"), NEXT_ALL),
+               OPT_CMDMODE(0, "write-terms", &cmdmode,
+                        N_("write the terms to .git/BISECT_TERMS"), WRITE_TERMS),
+               OPT_CMDMODE(0, "bisect-clean-state", &cmdmode,
+                        N_("cleanup the bisection state"), BISECT_CLEAN_STATE),
+               OPT_CMDMODE(0, "check-expected-revs", &cmdmode,
+                        N_("check for expected revs"), CHECK_EXPECTED_REVS),
                OPT_BOOL(0, "no-checkout", &no_checkout,
                         N_("update BISECT_HEAD instead of checking out the current commit")),
                OPT_END()
@@ -23,9 +132,25 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
        argc = parse_options(argc, argv, prefix, options,
                             git_bisect_helper_usage, 0);
 
-       if (!next_all)
+       if (!cmdmode)
                usage_with_options(git_bisect_helper_usage, options);
 
-       /* next-all */
-       return bisect_next_all(prefix, no_checkout);
+       switch (cmdmode) {
+       case NEXT_ALL:
+               return bisect_next_all(the_repository, prefix, no_checkout);
+       case WRITE_TERMS:
+               if (argc != 2)
+                       return error(_("--write-terms requires two arguments"));
+               return write_terms(argv[0], argv[1]);
+       case BISECT_CLEAN_STATE:
+               if (argc != 0)
+                       return error(_("--bisect-clean-state requires no arguments"));
+               return bisect_clean_state();
+       case CHECK_EXPECTED_REVS:
+               check_expected_revs(argv, argc);
+               return 0;
+       default:
+               return error("BUG: unknown subcommand '%d'", cmdmode);
+       }
+       return 0;
 }