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