builtin/revert.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "builtin.h"
   4 #include "parse-options.h"
   5 #include "diff.h"
   6 #include "revision.h"
   7 #include "rerere.h"
   8 #include "dir.h"
   9 #include "sequencer.h"
  10 #include "branch.h"
  11
  12 /*
  13  * This implements the builtins revert and cherry-pick.
  14  *
  15  * Copyright (c) 2007 Johannes E. Schindelin
  16  *
  17  * Based on git-revert.sh, which is
  18  *
  19  * Copyright (c) 2005 Linus Torvalds
  20  * Copyright (c) 2005 Junio C Hamano
  21  */
  22
  23 static const char * const revert_usage[] = {
  24         N_("git revert [<options>] <commit-ish>..."),
  25         N_("git revert <subcommand>"),
  26         NULL
  27 };
  28
  29 static const char * const cherry_pick_usage[] = {
  30         N_("git cherry-pick [<options>] <commit-ish>..."),
  31         N_("git cherry-pick <subcommand>"),
  32         NULL
  33 };
  34
  35 static const char *action_name(const struct replay_opts *opts)
  36 {
  37         return opts->action == REPLAY_REVERT ? "revert" : "cherry-pick";
  38 }
  39
  40 static const char * const *revert_or_cherry_pick_usage(struct replay_opts *opts)
  41 {
  42         return opts->action == REPLAY_REVERT ? revert_usage : cherry_pick_usage;
  43 }
  44
  45 static int option_parse_x(const struct option *opt,
  46                           const char *arg, int unset)
  47 {
  48         struct replay_opts **opts_ptr = opt->value;
  49         struct replay_opts *opts = *opts_ptr;
  50
  51         if (unset)
  52                 return 0;
  53
  54         ALLOC_GROW(opts->xopts, opts->xopts_nr + 1, opts->xopts_alloc);
  55         opts->xopts[opts->xopts_nr++] = xstrdup(arg);
  56         return 0;
  57 }
  58
  59 static int option_parse_m(const struct option *opt,
  60                           const char *arg, int unset)
  61 {
  62         struct replay_opts *replay = opt->value;
  63         char *end;
  64
  65         if (unset) {
  66                 replay->mainline = 0;
  67                 return 0;
  68         }
  69
  70         replay->mainline = strtol(arg, &end, 10);
  71         if (*end || replay->mainline <= 0)
  72                 return opterror(opt, "expects a number greater than zero", 0);
  73
  74         return 0;
  75 }
  76
  77 LAST_ARG_MUST_BE_NULL
  78 static void verify_opt_compatible(const char *me, const char *base_opt, ...)
  79 {
  80         const char *this_opt;
  81         va_list ap;
  82
  83         va_start(ap, base_opt);
  84         while ((this_opt = va_arg(ap, const char *))) {
  85                 if (va_arg(ap, int))
  86                         break;
  87         }
  88         va_end(ap);
  89
  90         if (this_opt)
  91                 die(_("%s: %s cannot be used with %s"), me, this_opt, base_opt);
  92 }
  93
  94 static int run_sequencer(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 cmd = 0;
  99         struct option base_options[] = {
 100                 OPT_CMDMODE(0, "quit", &cmd, N_("end revert or cherry-pick sequence"), 'q'),
 101                 OPT_CMDMODE(0, "continue", &cmd, N_("resume revert or cherry-pick sequence"), 'c'),
 102                 OPT_CMDMODE(0, "abort", &cmd, N_("cancel revert or cherry-pick sequence"), 'a'),
 103                 OPT_BOOL('n', "no-commit", &opts->no_commit, N_("don't automatically commit")),
 104                 OPT_BOOL('e', "edit", &opts->edit, N_("edit the commit message")),
 105                 OPT_NOOP_NOARG('r', NULL),
 106                 OPT_BOOL('s', "signoff", &opts->signoff, N_("add Signed-off-by:")),
 107                 OPT_CALLBACK('m', "mainline", opts, N_("parent-number"),
 108                              N_("select mainline parent"), option_parse_m),
 109                 OPT_RERERE_AUTOUPDATE(&opts->allow_rerere_auto),
 110                 OPT_STRING(0, "strategy", &opts->strategy, N_("strategy"), N_("merge strategy")),
 111                 OPT_CALLBACK('X', "strategy-option", &opts, N_("option"),
 112                         N_("option for merge strategy"), option_parse_x),
 113                 { OPTION_STRING, 'S', "gpg-sign", &opts->gpg_sign, N_("key-id"),
 114                   N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
 115                 OPT_END()
 116         };
 117         struct option *options = base_options;
 118
 119         if (opts->action == REPLAY_PICK) {
 120                 struct option cp_extra[] = {
 121                         OPT_BOOL('x', NULL, &opts->record_origin, N_("append commit name")),
 122                         OPT_BOOL(0, "ff", &opts->allow_ff, N_("allow fast-forward")),
 123                         OPT_BOOL(0, "allow-empty", &opts->allow_empty, N_("preserve initially empty commits")),
 124                         OPT_BOOL(0, "allow-empty-message", &opts->allow_empty_message, N_("allow commits with empty messages")),
 125                         OPT_BOOL(0, "keep-redundant-commits", &opts->keep_redundant_commits, N_("keep redundant, empty commits")),
 126                         OPT_END(),
 127                 };
 128                 options = parse_options_concat(options, cp_extra);
 129         }
 130
 131         argc = parse_options(argc, argv, NULL, options, usage_str,
 132                         PARSE_OPT_KEEP_ARGV0 |
 133                         PARSE_OPT_KEEP_UNKNOWN);
 134
 135         /* implies allow_empty */
 136         if (opts->keep_redundant_commits)
 137                 opts->allow_empty = 1;
 138
 139         /* Check for incompatible command line arguments */
 140         if (cmd) {
 141                 char *this_operation;
 142                 if (cmd == 'q')
 143                         this_operation = "--quit";
 144                 else if (cmd == 'c')
 145                         this_operation = "--continue";
 146                 else {
 147                         assert(cmd == 'a');
 148                         this_operation = "--abort";
 149                 }
 150
 151                 verify_opt_compatible(me, this_operation,
 152                                 "--no-commit", opts->no_commit,
 153                                 "--signoff", opts->signoff,
 154                                 "--mainline", opts->mainline,
 155                                 "--strategy", opts->strategy ? 1 : 0,
 156                                 "--strategy-option", opts->xopts ? 1 : 0,
 157                                 "-x", opts->record_origin,
 158                                 "--ff", opts->allow_ff,
 159                                 "--rerere-autoupdate", opts->allow_rerere_auto == RERERE_AUTOUPDATE,
 160                                 "--no-rerere-autoupdate", opts->allow_rerere_auto == RERERE_NOAUTOUPDATE,
 161                                 NULL);
 162         }
 163
 164         if (opts->allow_ff)
 165                 verify_opt_compatible(me, "--ff",
 166                                 "--signoff", opts->signoff,
 167                                 "--no-commit", opts->no_commit,
 168                                 "-x", opts->record_origin,
 169                                 "--edit", opts->edit,
 170                                 NULL);
 171
 172         if (cmd) {
 173                 opts->revs = NULL;
 174         } else {
 175                 struct setup_revision_opt s_r_opt;
 176                 opts->revs = xmalloc(sizeof(*opts->revs));
 177                 init_revisions(opts->revs, NULL);
 178                 opts->revs->no_walk = REVISION_WALK_NO_WALK_UNSORTED;
 179                 if (argc < 2)
 180                         usage_with_options(usage_str, options);
 181                 if (!strcmp(argv[1], "-"))
 182                         argv[1] = "@{-1}";
 183                 memset(&s_r_opt, 0, sizeof(s_r_opt));
 184                 s_r_opt.assume_dashdash = 1;
 185                 argc = setup_revisions(argc, argv, opts->revs, &s_r_opt);
 186         }
 187
 188         if (argc > 1)
 189                 usage_with_options(usage_str, options);
 190
 191         /* These option values will be free()d */
 192         opts->gpg_sign = xstrdup_or_null(opts->gpg_sign);
 193         opts->strategy = xstrdup_or_null(opts->strategy);
 194
 195         if (cmd == 'q') {
 196                 int ret = sequencer_remove_state(opts);
 197                 if (!ret)
 198                         remove_branch_state();
 199                 return ret;
 200         }
 201         if (cmd == 'c')
 202                 return sequencer_continue(opts);
 203         if (cmd == 'a')
 204                 return sequencer_rollback(opts);
 205         return sequencer_pick_revisions(opts);
 206 }
 207
 208 int cmd_revert(int argc, const char **argv, const char *prefix)
 209 {
 210         struct replay_opts opts = REPLAY_OPTS_INIT;
 211         int res;
 212
 213         if (isatty(0))
 214                 opts.edit = 1;
 215         opts.action = REPLAY_REVERT;
 216         sequencer_init_config(&opts);
 217         res = run_sequencer(argc, argv, &opts);
 218         if (res < 0)
 219                 die(_("revert failed"));
 220         return res;
 221 }
 222
 223 int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
 224 {
 225         struct replay_opts opts = REPLAY_OPTS_INIT;
 226         int res;
 227
 228         opts.action = REPLAY_PICK;
 229         sequencer_init_config(&opts);
 230         res = run_sequencer(argc, argv, &opts);
 231         if (res < 0)
 232                 die(_("cherry-pick failed"));
 233         return res;
 234 }