builtin/revert.c

   1 #include "cache.h"
   2 #include "builtin.h"
   3 #include "parse-options.h"
   4 #include "diff.h"
   5 #include "revision.h"
   6 #include "rerere.h"
   7 #include "dir.h"
   8 #include "sequencer.h"
   9
  10 /*
  11  * This implements the builtins revert and cherry-pick.
  12  *
  13  * Copyright (c) 2007 Johannes E. Schindelin
  14  *
  15  * Based on git-revert.sh, which is
  16  *
  17  * Copyright (c) 2005 Linus Torvalds
  18  * Copyright (c) 2005 Junio C Hamano
  19  */
  20
  21 static const char * const revert_usage[] = {
  22         "git revert [options] <commit-ish>",
  23         "git revert <subcommand>",
  24         NULL
  25 };
  26
  27 static const char * const cherry_pick_usage[] = {
  28         "git cherry-pick [options] <commit-ish>",
  29         "git cherry-pick <subcommand>",
  30         NULL
  31 };
  32
  33 static const char *action_name(const struct replay_opts *opts)
  34 {
  35         return opts->action == REPLAY_REVERT ? "revert" : "cherry-pick";
  36 }
  37
  38 static const char * const *revert_or_cherry_pick_usage(struct replay_opts *opts)
  39 {
  40         return opts->action == REPLAY_REVERT ? revert_usage : cherry_pick_usage;
  41 }
  42
  43 static int option_parse_x(const struct option *opt,
  44                           const char *arg, int unset)
  45 {
  46         struct replay_opts **opts_ptr = opt->value;
  47         struct replay_opts *opts = *opts_ptr;
  48
  49         if (unset)
  50                 return 0;
  51
  52         ALLOC_GROW(opts->xopts, opts->xopts_nr + 1, opts->xopts_alloc);
  53         opts->xopts[opts->xopts_nr++] = xstrdup(arg);
  54         return 0;
  55 }
  56
  57 static void verify_opt_compatible(const char *me, const char *base_opt, ...)
  58 {
  59         const char *this_opt;
  60         va_list ap;
  61
  62         va_start(ap, base_opt);
  63         while ((this_opt = va_arg(ap, const char *))) {
  64                 if (va_arg(ap, int))
  65                         break;
  66         }
  67         va_end(ap);
  68
  69         if (this_opt)
  70                 die(_("%s: %s cannot be used with %s"), me, this_opt, base_opt);
  71 }
  72
  73 static void verify_opt_mutually_compatible(const char *me, ...)
  74 {
  75         const char *opt1, *opt2 = NULL;
  76         va_list ap;
  77
  78         va_start(ap, me);
  79         while ((opt1 = va_arg(ap, const char *))) {
  80                 if (va_arg(ap, int))
  81                         break;
  82         }
  83         if (opt1) {
  84                 while ((opt2 = va_arg(ap, const char *))) {
  85                         if (va_arg(ap, int))
  86                                 break;
  87                 }
  88         }
  89
  90         if (opt1 && opt2)
  91                 die(_("%s: %s cannot be used with %s"), me, opt1, opt2);
  92 }
  93
  94 static void parse_args(int argc, const char **argv, struct replay_opts *opts)
  95 {
  96         const char * const * usage_str = revert_or_cherry_pick_usage(opts);
  97         const char *me = action_name(opts);
  98         int remove_state = 0;
  99         int contin = 0;
 100         int rollback = 0;
 101         struct option options[] = {
 102                 OPT_BOOLEAN(0, "quit", &remove_state, "end revert or cherry-pick sequence"),
 103                 OPT_BOOLEAN(0, "continue", &contin, "resume revert or cherry-pick sequence"),
 104                 OPT_BOOLEAN(0, "abort", &rollback, "cancel revert or cherry-pick sequence"),
 105                 OPT_BOOLEAN('n', "no-commit", &opts->no_commit, "don't automatically commit"),
 106                 OPT_BOOLEAN('e', "edit", &opts->edit, "edit the commit message"),
 107                 OPT_NOOP_NOARG('r', NULL),
 108                 OPT_BOOLEAN('s', "signoff", &opts->signoff, "add Signed-off-by:"),
 109                 OPT_INTEGER('m', "mainline", &opts->mainline, "parent number"),
 110                 OPT_RERERE_AUTOUPDATE(&opts->allow_rerere_auto),
 111                 OPT_STRING(0, "strategy", &opts->strategy, "strategy", "merge strategy"),
 112                 OPT_CALLBACK('X', "strategy-option", &opts, "option",
 113                         "option for merge strategy", option_parse_x),
 114                 OPT_END(),
 115                 OPT_END(),
 116                 OPT_END(),
 117                 OPT_END(),
 118         };
 119
 120         if (opts->action == REPLAY_PICK) {
 121                 struct option cp_extra[] = {
 122                         OPT_BOOLEAN('x', NULL, &opts->record_origin, "append commit name"),
 123                         OPT_BOOLEAN(0, "ff", &opts->allow_ff, "allow fast-forward"),
 124                         OPT_BOOLEAN(0, "allow-empty", &opts->allow_empty, "preserve empty commits"),
 125                         OPT_END(),
 126                 };
 127                 if (parse_options_concat(options, ARRAY_SIZE(options), cp_extra))
 128                         die(_("program error"));
 129         }
 130
 131         argc = parse_options(argc, argv, NULL, options, usage_str,
 132                         PARSE_OPT_KEEP_ARGV0 |
 133                         PARSE_OPT_KEEP_UNKNOWN);
 134
 135         /* Check for incompatible subcommands */
 136         verify_opt_mutually_compatible(me,
 137                                 "--quit", remove_state,
 138                                 "--continue", contin,
 139                                 "--abort", rollback,
 140                                 NULL);
 141
 142         /* Set the subcommand */
 143         if (remove_state)
 144                 opts->subcommand = REPLAY_REMOVE_STATE;
 145         else if (contin)
 146                 opts->subcommand = REPLAY_CONTINUE;
 147         else if (rollback)
 148                 opts->subcommand = REPLAY_ROLLBACK;
 149         else
 150                 opts->subcommand = REPLAY_NONE;
 151
 152         /* Check for incompatible command line arguments */
 153         if (opts->subcommand != REPLAY_NONE) {
 154                 char *this_operation;
 155                 if (opts->subcommand == REPLAY_REMOVE_STATE)
 156                         this_operation = "--quit";
 157                 else if (opts->subcommand == REPLAY_CONTINUE)
 158                         this_operation = "--continue";
 159                 else {
 160                         assert(opts->subcommand == REPLAY_ROLLBACK);
 161                         this_operation = "--abort";
 162                 }
 163
 164                 verify_opt_compatible(me, this_operation,
 165                                 "--no-commit", opts->no_commit,
 166                                 "--signoff", opts->signoff,
 167                                 "--mainline", opts->mainline,
 168                                 "--strategy", opts->strategy ? 1 : 0,
 169                                 "--strategy-option", opts->xopts ? 1 : 0,
 170                                 "-x", opts->record_origin,
 171                                 "--ff", opts->allow_ff,
 172                                 NULL);
 173         }
 174
 175         if (opts->allow_ff)
 176                 verify_opt_compatible(me, "--ff",
 177                                 "--signoff", opts->signoff,
 178                                 "--no-commit", opts->no_commit,
 179                                 "-x", opts->record_origin,
 180                                 "--edit", opts->edit,
 181                                 NULL);
 182
 183         if (opts->subcommand != REPLAY_NONE) {
 184                 opts->revs = NULL;
 185         } else {
 186                 opts->revs = xmalloc(sizeof(*opts->revs));
 187                 init_revisions(opts->revs, NULL);
 188                 opts->revs->no_walk = 1;
 189                 if (argc < 2)
 190                         usage_with_options(usage_str, options);
 191                 argc = setup_revisions(argc, argv, opts->revs, NULL);
 192         }
 193
 194         if (argc > 1)
 195                 usage_with_options(usage_str, options);
 196 }
 197
 198 int cmd_revert(int argc, const char **argv, const char *prefix)
 199 {
 200         struct replay_opts opts;
 201         int res;
 202
 203         memset(&opts, 0, sizeof(opts));
 204         if (isatty(0))
 205                 opts.edit = 1;
 206         opts.action = REPLAY_REVERT;
 207         git_config(git_default_config, NULL);
 208         parse_args(argc, argv, &opts);
 209         res = sequencer_pick_revisions(&opts);
 210         if (res < 0)
 211                 die(_("revert failed"));
 212         return res;
 213 }
 214
 215 int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
 216 {
 217         struct replay_opts opts;
 218         int res;
 219
 220         memset(&opts, 0, sizeof(opts));
 221         opts.action = REPLAY_PICK;
 222         git_config(git_default_config, NULL);
 223         parse_args(argc, argv, &opts);
 224         res = sequencer_pick_revisions(&opts);
 225         if (res < 0)
 226                 die(_("cherry-pick failed"));
 227         return res;
 228 }