Andrew's git - gitweb.git/blob - builtin/bisect--helper.c

   1#include "builtin.h"
   2#include "cache.h"
   3#include "parse-options.h"
   4#include "bisect.h"
   5#include "refs.h"
   6
   7static GIT_PATH_FUNC(git_path_bisect_terms, "BISECT_TERMS")
   8
   9static const char * const git_bisect_helper_usage[] = {
  10        N_("git bisect--helper --next-all [--no-checkout]"),
  11        N_("git bisect--helper --write-terms <bad_term> <good_term>"),
  12        N_("git bisect--helper --bisect-clean-state"),
  13        NULL
  14};
  15
  16/*
  17 * Check whether the string `term` belongs to the set of strings
  18 * included in the variable arguments.
  19 */
  20LAST_ARG_MUST_BE_NULL
  21static int one_of(const char *term, ...)
  22{
  23        int res = 0;
  24        va_list matches;
  25        const char *match;
  26
  27        va_start(matches, term);
  28        while (!res && (match = va_arg(matches, const char *)))
  29                res = !strcmp(term, match);
  30        va_end(matches);
  31
  32        return res;
  33}
  34
  35static int check_term_format(const char *term, const char *orig_term)
  36{
  37        int res;
  38        char *new_term = xstrfmt("refs/bisect/%s", term);
  39
  40        res = check_refname_format(new_term, 0);
  41        free(new_term);
  42
  43        if (res)
  44                return error(_("'%s' is not a valid term"), term);
  45
  46        if (one_of(term, "help", "start", "skip", "next", "reset",
  47                        "visualize", "replay", "log", "run", "terms", NULL))
  48                return error(_("can't use the builtin command '%s' as a term"), term);
  49
  50        /*
  51         * In theory, nothing prevents swapping completely good and bad,
  52         * but this situation could be confusing and hasn't been tested
  53         * enough. Forbid it for now.
  54         */
  55
  56        if ((strcmp(orig_term, "bad") && one_of(term, "bad", "new", NULL)) ||
  57                 (strcmp(orig_term, "good") && one_of(term, "good", "old", NULL)))
  58                return error(_("can't change the meaning of the term '%s'"), term);
  59
  60        return 0;
  61}
  62
  63static int write_terms(const char *bad, const char *good)
  64{
  65        FILE *fp = NULL;
  66        int res;
  67
  68        if (!strcmp(bad, good))
  69                return error(_("please use two different terms"));
  70
  71        if (check_term_format(bad, "bad") || check_term_format(good, "good"))
  72                return -1;
  73
  74        fp = fopen(git_path_bisect_terms(), "w");
  75        if (!fp)
  76                return error_errno(_("could not open the file BISECT_TERMS"));
  77
  78        res = fprintf(fp, "%s\n%s\n", bad, good);
  79        res |= fclose(fp);
  80        return (res < 0) ? -1 : 0;
  81}
  82
  83int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
  84{
  85        enum {
  86                NEXT_ALL = 1,
  87                WRITE_TERMS,
  88                BISECT_CLEAN_STATE
  89        } cmdmode = 0;
  90        int no_checkout = 0;
  91        struct option options[] = {
  92                OPT_CMDMODE(0, "next-all", &cmdmode,
  93                         N_("perform 'git bisect next'"), NEXT_ALL),
  94                OPT_CMDMODE(0, "write-terms", &cmdmode,
  95                         N_("write the terms to .git/BISECT_TERMS"), WRITE_TERMS),
  96                OPT_CMDMODE(0, "bisect-clean-state", &cmdmode,
  97                         N_("cleanup the bisection state"), BISECT_CLEAN_STATE),
  98                OPT_BOOL(0, "no-checkout", &no_checkout,
  99                         N_("update BISECT_HEAD instead of checking out the current commit")),
 100                OPT_END()
 101        };
 102
 103        argc = parse_options(argc, argv, prefix, options,
 104                             git_bisect_helper_usage, 0);
 105
 106        if (!cmdmode)
 107                usage_with_options(git_bisect_helper_usage, options);
 108
 109        switch (cmdmode) {
 110        case NEXT_ALL:
 111                return bisect_next_all(prefix, no_checkout);
 112        case WRITE_TERMS:
 113                if (argc != 2)
 114                        return error(_("--write-terms requires two arguments"));
 115                return write_terms(argv[0], argv[1]);
 116        case BISECT_CLEAN_STATE:
 117                if (argc != 0)
 118                        return error(_("--bisect-clean-state requires no arguments"));
 119                return bisect_clean_state();
 120        default:
 121                return error("BUG: unknown subcommand '%d'", cmdmode);
 122        }
 123        return 0;
 124}