rebase-interactive.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "sequencer.h"
   4 #include "rebase-interactive.h"
   5 #include "strbuf.h"
   6 #include "commit-slab.h"
   7 #include "config.h"
   8 #include "dir.h"
   9
  10 static const char edit_todo_list_advice[] =
  11 N_("You can fix this with 'git rebase --edit-todo' "
  12 "and then run 'git rebase --continue'.\n"
  13 "Or you can abort the rebase with 'git rebase"
  14 " --abort'.\n");
  15
  16 enum missing_commit_check_level {
  17         MISSING_COMMIT_CHECK_IGNORE = 0,
  18         MISSING_COMMIT_CHECK_WARN,
  19         MISSING_COMMIT_CHECK_ERROR
  20 };
  21
  22 static enum missing_commit_check_level get_missing_commit_check_level(void)
  23 {
  24         const char *value;
  25
  26         if (git_config_get_value("rebase.missingcommitscheck", &value) ||
  27                         !strcasecmp("ignore", value))
  28                 return MISSING_COMMIT_CHECK_IGNORE;
  29         if (!strcasecmp("warn", value))
  30                 return MISSING_COMMIT_CHECK_WARN;
  31         if (!strcasecmp("error", value))
  32                 return MISSING_COMMIT_CHECK_ERROR;
  33         warning(_("unrecognized setting %s for option "
  34                   "rebase.missingCommitsCheck. Ignoring."), value);
  35         return MISSING_COMMIT_CHECK_IGNORE;
  36 }
  37
  38 void append_todo_help(int command_count,
  39                       const char *shortrevisions, const char *shortonto,
  40                       struct strbuf *buf)
  41 {
  42         const char *msg = _("\nCommands:\n"
  43 "p, pick <commit> = use commit\n"
  44 "r, reword <commit> = use commit, but edit the commit message\n"
  45 "e, edit <commit> = use commit, but stop for amending\n"
  46 "s, squash <commit> = use commit, but meld into previous commit\n"
  47 "f, fixup <commit> = like \"squash\", but discard this commit's log message\n"
  48 "x, exec <command> = run command (the rest of the line) using shell\n"
  49 "b, break = stop here (continue rebase later with 'git rebase --continue')\n"
  50 "d, drop <commit> = remove commit\n"
  51 "l, label <label> = label current HEAD with a name\n"
  52 "t, reset <label> = reset HEAD to a label\n"
  53 "m, merge [-C <commit> | -c <commit>] <label> [# <oneline>]\n"
  54 ".       create a merge commit using the original merge commit's\n"
  55 ".       message (or the oneline, if no original merge commit was\n"
  56 ".       specified). Use -c <commit> to reword the commit message.\n"
  57 "\n"
  58 "These lines can be re-ordered; they are executed from top to bottom.\n");
  59         unsigned edit_todo = !(shortrevisions && shortonto);
  60
  61         if (!edit_todo) {
  62                 strbuf_addch(buf, '\n');
  63                 strbuf_commented_addf(buf, Q_("Rebase %s onto %s (%d command)",
  64                                               "Rebase %s onto %s (%d commands)",
  65                                               command_count),
  66                                       shortrevisions, shortonto, command_count);
  67         }
  68
  69         strbuf_add_commented_lines(buf, msg, strlen(msg));
  70
  71         if (get_missing_commit_check_level() == MISSING_COMMIT_CHECK_ERROR)
  72                 msg = _("\nDo not remove any line. Use 'drop' "
  73                          "explicitly to remove a commit.\n");
  74         else
  75                 msg = _("\nIf you remove a line here "
  76                          "THAT COMMIT WILL BE LOST.\n");
  77
  78         strbuf_add_commented_lines(buf, msg, strlen(msg));
  79
  80         if (edit_todo)
  81                 msg = _("\nYou are editing the todo file "
  82                         "of an ongoing interactive rebase.\n"
  83                         "To continue rebase after editing, run:\n"
  84                         "    git rebase --continue\n\n");
  85         else
  86                 msg = _("\nHowever, if you remove everything, "
  87                         "the rebase will be aborted.\n\n");
  88
  89         strbuf_add_commented_lines(buf, msg, strlen(msg));
  90 }
  91
  92 int edit_todo_list(struct repository *r, struct todo_list *todo_list,
  93                    struct todo_list *new_todo, const char *shortrevisions,
  94                    const char *shortonto, unsigned flags)
  95 {
  96         const char *todo_file = rebase_path_todo(),
  97                 *todo_backup = rebase_path_todo_backup();
  98         unsigned initial = shortrevisions && shortonto;
  99         int incorrect = 0;
 100
 101         /* If the user is editing the todo list, we first try to parse
 102          * it.  If there is an error, we do not return, because the user
 103          * might want to fix it in the first place. */
 104         if (!initial)
 105                 incorrect = todo_list_parse_insn_buffer(r, todo_list->buf.buf, todo_list) |
 106                         file_exists(rebase_path_dropped());
 107
 108         if (todo_list_write_to_file(r, todo_list, todo_file, shortrevisions, shortonto,
 109                                     -1, flags | TODO_LIST_SHORTEN_IDS | TODO_LIST_APPEND_TODO_HELP))
 110                 return error_errno(_("could not write '%s'"), todo_file);
 111
 112         if (!incorrect &&
 113             todo_list_write_to_file(r, todo_list, todo_backup,
 114                                     shortrevisions, shortonto, -1,
 115                                     (flags | TODO_LIST_APPEND_TODO_HELP) & ~TODO_LIST_SHORTEN_IDS) < 0)
 116                 return error(_("could not write '%s'."), rebase_path_todo_backup());
 117
 118         if (launch_sequence_editor(todo_file, &new_todo->buf, NULL))
 119                 return -2;
 120
 121         strbuf_stripspace(&new_todo->buf, 1);
 122         if (initial && new_todo->buf.len == 0)
 123                 return -3;
 124
 125         if (todo_list_parse_insn_buffer(r, new_todo->buf.buf, new_todo)) {
 126                 fprintf(stderr, _(edit_todo_list_advice));
 127                 return -4;
 128         }
 129
 130         if (incorrect) {
 131                 if (todo_list_check_against_backup(r, new_todo)) {
 132                         write_file(rebase_path_dropped(), "");
 133                         return -4;
 134                 }
 135
 136                 if (incorrect > 0)
 137                         unlink(rebase_path_dropped());
 138         } else if (todo_list_check(todo_list, new_todo)) {
 139                 write_file(rebase_path_dropped(), "");
 140                 return -4;
 141         }
 142
 143         return 0;
 144 }
 145
 146 define_commit_slab(commit_seen, unsigned char);
 147 /*
 148  * Check if the user dropped some commits by mistake
 149  * Behaviour determined by rebase.missingCommitsCheck.
 150  * Check if there is an unrecognized command or a
 151  * bad SHA-1 in a command.
 152  */
 153 int todo_list_check(struct todo_list *old_todo, struct todo_list *new_todo)
 154 {
 155         enum missing_commit_check_level check_level = get_missing_commit_check_level();
 156         struct strbuf missing = STRBUF_INIT;
 157         int res = 0, i;
 158         struct commit_seen commit_seen;
 159
 160         init_commit_seen(&commit_seen);
 161
 162         if (check_level == MISSING_COMMIT_CHECK_IGNORE)
 163                 goto leave_check;
 164
 165         /* Mark the commits in git-rebase-todo as seen */
 166         for (i = 0; i < new_todo->nr; i++) {
 167                 struct commit *commit = new_todo->items[i].commit;
 168                 if (commit)
 169                         *commit_seen_at(&commit_seen, commit) = 1;
 170         }
 171
 172         /* Find commits in git-rebase-todo.backup yet unseen */
 173         for (i = old_todo->nr - 1; i >= 0; i--) {
 174                 struct todo_item *item = old_todo->items + i;
 175                 struct commit *commit = item->commit;
 176                 if (commit && !*commit_seen_at(&commit_seen, commit)) {
 177                         strbuf_addf(&missing, " - %s %.*s\n",
 178                                     find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV),
 179                                     item->arg_len,
 180                                     todo_item_get_arg(old_todo, item));
 181                         *commit_seen_at(&commit_seen, commit) = 1;
 182                 }
 183         }
 184
 185         /* Warn about missing commits */
 186         if (!missing.len)
 187                 goto leave_check;
 188
 189         if (check_level == MISSING_COMMIT_CHECK_ERROR)
 190                 res = 1;
 191
 192         fprintf(stderr,
 193                 _("Warning: some commits may have been dropped accidentally.\n"
 194                 "Dropped commits (newer to older):\n"));
 195
 196         /* Make the list user-friendly and display */
 197         fputs(missing.buf, stderr);
 198         strbuf_release(&missing);
 199
 200         fprintf(stderr, _("To avoid this message, use \"drop\" to "
 201                 "explicitly remove a commit.\n\n"
 202                 "Use 'git config rebase.missingCommitsCheck' to change "
 203                 "the level of warnings.\n"
 204                 "The possible behaviours are: ignore, warn, error.\n\n"));
 205
 206         fprintf(stderr, _(edit_todo_list_advice));
 207
 208 leave_check:
 209         clear_commit_seen(&commit_seen);
 210         return res;
 211 }
 212
 213 int todo_list_check_against_backup(struct repository *r, struct todo_list *todo_list)
 214 {
 215         struct todo_list backup = TODO_LIST_INIT;
 216         int res = 0;
 217
 218         if (strbuf_read_file(&backup.buf, rebase_path_todo_backup(), 0) > 0) {
 219                 todo_list_parse_insn_buffer(r, backup.buf.buf, &backup);
 220                 res = todo_list_check(&backup, todo_list);
 221         }
 222
 223         todo_list_release(&backup);
 224         return res;
 225 }
 226
 227 int check_todo_list_from_file(struct repository *r)
 228 {
 229         struct todo_list old_todo = TODO_LIST_INIT, new_todo = TODO_LIST_INIT;
 230         int res = 0;
 231
 232         if (strbuf_read_file(&new_todo.buf, rebase_path_todo(), 0) < 0) {
 233                 res = error(_("could not read '%s'."), rebase_path_todo());
 234                 goto out;
 235         }
 236
 237         if (strbuf_read_file(&old_todo.buf, rebase_path_todo_backup(), 0) < 0) {
 238                 res = error(_("could not read '%s'."), rebase_path_todo_backup());
 239                 goto out;
 240         }
 241
 242         res = todo_list_parse_insn_buffer(r, old_todo.buf.buf, &old_todo);
 243         if (!res)
 244                 res = todo_list_parse_insn_buffer(r, new_todo.buf.buf, &new_todo);
 245         if (res)
 246                 fprintf(stderr, _(edit_todo_list_advice));
 247         if (!res)
 248                 res = todo_list_check(&old_todo, &new_todo);
 249 out:
 250         todo_list_release(&old_todo);
 251         todo_list_release(&new_todo);
 252
 253         return res;
 254 }