rebase-interactive.c

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