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submodule merge: update conflict error message
When attempting to merge in a superproject with conflicting submodule pointers that cannot be fast-forwarded or trivially resolved, the merge fails and Git prints an error message that accurately describes the failure, but does not provide steps for the user to resolve the error. Git is left in a conflicted state, which requires the user to: 1. merge submodules or update submodules to an already existing commit that reflects the merge 2. add submodules changes to the superproject 3. finish merging superproject These steps are non-obvious for newer submodule users to figure out based on the error message and neither `git submodule status` nor `git status` provide any useful pointers. Update error message to provide steps to resolve submodule merge conflict. Future work could involve adding an advice flag to the message. Although the message is long, it also has the id of the submodule commit that needs to be merged, which could be useful information for the user. Additionally, 5 merge failures that resulted in an early return have been updated to reflect the status of the merge. 1. Null merge base (null o): CONFLICT_SUBMODULE_NULL_MERGE_BASE added as a new conflict type and will print updated error message. 2. Null merge side a (null a): BUG(). See [1] for discussion 3. Null merge side b (null b): BUG(). See [1] for discussion 4. Submodule not checked out: added NEEDSWORK bit 5. Submodule commits not present: added NEEDSWORK bit The errors with a NEEDSWORK bit deserve a more detailed explanation of how to resolve them. See [2] for more context. [1] https://lore.kernel.org/git/CABPp-BE0qGwUy80dmVszkJQ+tcpfLRW0OZyErymzhZ9+HWY1mw@mail.gmail.com/ [2] https://lore.kernel.org/git/xmqqpmhjjwo9.fsf@gitster.g/ Signed-off-by: Calvin Wan <calvinwan@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Calvin Wan
Junio C Hamano
parent
71a8fab31b
commit
4057523a40
161
merge-ort.c
161
merge-ort.c
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@ -387,8 +387,24 @@ struct merge_options_internal {
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/* call_depth: recursion level counter for merging merge bases */
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int call_depth;
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/* field that holds submodule conflict information */
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struct string_list conflicted_submodules;
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};
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struct conflicted_submodule_item {
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char *abbrev;
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int flag;
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};
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static void conflicted_submodule_item_free(void *util, const char *str)
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{
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struct conflicted_submodule_item *item = util;
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free(item->abbrev);
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free(item);
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}
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struct version_info {
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struct object_id oid;
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unsigned short mode;
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@ -517,6 +533,7 @@ enum conflict_and_info_types {
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CONFLICT_SUBMODULE_NOT_INITIALIZED,
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CONFLICT_SUBMODULE_HISTORY_NOT_AVAILABLE,
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CONFLICT_SUBMODULE_MAY_HAVE_REWINDS,
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CONFLICT_SUBMODULE_NULL_MERGE_BASE,
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/* Keep this entry _last_ in the list */
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NB_CONFLICT_TYPES,
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@ -570,6 +587,8 @@ static const char *type_short_descriptions[] = {
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"CONFLICT (submodule history not available)",
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[CONFLICT_SUBMODULE_MAY_HAVE_REWINDS] =
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"CONFLICT (submodule may have rewinds)",
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[CONFLICT_SUBMODULE_NULL_MERGE_BASE] =
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"CONFLICT (submodule lacks merge base)"
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};
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struct logical_conflict_info {
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@ -686,6 +705,9 @@ static void clear_or_reinit_internal_opts(struct merge_options_internal *opti,
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mem_pool_discard(&opti->pool, 0);
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string_list_clear_func(&opti->conflicted_submodules,
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conflicted_submodule_item_free);
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/* Clean out callback_data as well. */
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FREE_AND_NULL(renames->callback_data);
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renames->callback_data_nr = renames->callback_data_alloc = 0;
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@ -1744,24 +1766,32 @@ static int merge_submodule(struct merge_options *opt,
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int i;
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int search = !opt->priv->call_depth;
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int sub_not_initialized = 1;
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int sub_flag = -1;
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/* store fallback answer in result in case we fail */
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oidcpy(result, opt->priv->call_depth ? o : a);
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/* we can not handle deletion conflicts */
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if (is_null_oid(o))
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return 0;
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if (is_null_oid(a))
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return 0;
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if (is_null_oid(b))
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return 0;
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if (is_null_oid(a) || is_null_oid(b))
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BUG("submodule deleted on one side; this should be handled outside of merge_submodule()");
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if (repo_submodule_init(&subrepo, opt->repo, path, null_oid())) {
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if ((sub_not_initialized = repo_submodule_init(&subrepo,
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opt->repo, path, null_oid()))) {
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path_msg(opt, CONFLICT_SUBMODULE_NOT_INITIALIZED, 0,
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path, NULL, NULL, NULL,
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_("Failed to merge submodule %s (not checked out)"),
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path);
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return 0;
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sub_flag = CONFLICT_SUBMODULE_NOT_INITIALIZED;
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goto cleanup;
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}
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if (is_null_oid(o)) {
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path_msg(opt, CONFLICT_SUBMODULE_NULL_MERGE_BASE, 0,
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path, NULL, NULL, NULL,
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_("Failed to merge submodule %s (no merge base)"),
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path);
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goto cleanup;
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}
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if (!(commit_o = lookup_commit_reference(&subrepo, o)) ||
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@ -1771,6 +1801,7 @@ static int merge_submodule(struct merge_options *opt,
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path, NULL, NULL, NULL,
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_("Failed to merge submodule %s (commits not present)"),
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path);
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sub_flag = CONFLICT_SUBMODULE_HISTORY_NOT_AVAILABLE;
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goto cleanup;
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}
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@ -1849,7 +1880,23 @@ static int merge_submodule(struct merge_options *opt,
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object_array_clear(&merges);
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cleanup:
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repo_clear(&subrepo);
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if (!opt->priv->call_depth && !ret) {
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struct string_list *csub = &opt->priv->conflicted_submodules;
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struct conflicted_submodule_item *util;
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const char *abbrev;
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util = xmalloc(sizeof(*util));
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util->flag = sub_flag;
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util->abbrev = NULL;
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if (!sub_not_initialized) {
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abbrev = repo_find_unique_abbrev(&subrepo, b, DEFAULT_ABBREV);
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util->abbrev = xstrdup(abbrev);
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}
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string_list_append(csub, path)->util = util;
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}
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if (!sub_not_initialized)
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repo_clear(&subrepo);
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return ret;
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}
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@ -4434,6 +4481,99 @@ static int record_conflicted_index_entries(struct merge_options *opt)
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return errs;
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}
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static void format_submodule_conflict_suggestion(struct strbuf *msg) {
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struct strbuf tmp = STRBUF_INIT;
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struct string_list msg_list = STRING_LIST_INIT_DUP;
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int i;
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string_list_split(&msg_list, msg->buf, '\n', -1);
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for (i = 0; i < msg_list.nr; i++) {
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if (!i)
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/*
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* TRANSLATORS: This is line item of submodule conflict message
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* from print_submodule_conflict_suggestion() below. For RTL
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* languages, the following swap is suggested:
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* " - %s\n" -> "%s - \n"
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*/
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strbuf_addf(&tmp, _(" - %s\n"), msg_list.items[i].string);
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else
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/*
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* TRANSLATORS: This is line item of submodule conflict message
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* from print_submodule_conflict_suggestion() below. For RTL
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* languages, the following swap is suggested:
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* " %s\n" -> "%s \n"
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*/
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strbuf_addf(&tmp, _(" %s\n"), msg_list.items[i].string);
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}
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strbuf_reset(msg);
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strbuf_add(msg, tmp.buf, tmp.len);
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}
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static void print_submodule_conflict_suggestion(struct string_list *csub) {
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struct string_list_item *item;
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struct strbuf msg = STRBUF_INIT;
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struct strbuf tmp = STRBUF_INIT;
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struct strbuf subs = STRBUF_INIT;
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if (!csub->nr)
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return;
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/*
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* NEEDSWORK: The steps to resolve these errors deserve a more
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* detailed explanation than what is currently printed below.
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*/
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for_each_string_list_item(item, csub) {
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struct conflicted_submodule_item *util = item->util;
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if (util->flag == CONFLICT_SUBMODULE_NOT_INITIALIZED ||
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util->flag == CONFLICT_SUBMODULE_HISTORY_NOT_AVAILABLE)
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return;
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}
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printf(_("Recursive merging with submodules currently only supports "
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"trivial cases.\nPlease manually handle the merging of each "
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"conflicted submodule.\nThis can be accomplished with the following "
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"steps:"));
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putchar('\n');
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for_each_string_list_item(item, csub) {
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struct conflicted_submodule_item *util = item->util;
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/*
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* TRANSLATORS: This is a line of advice to resolve a merge conflict
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* in a submodule. The second argument is the abbreviated id of the
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* commit that needs to be merged.
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* E.g. - go to submodule (sub), and either merge commit abc1234"
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*/
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strbuf_addf(&tmp, _("go to submodule (%s), and either merge commit %s\n"
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"or update to an existing commit which has merged those changes"),
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item->string, util->abbrev);
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format_submodule_conflict_suggestion(&tmp);
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strbuf_add(&msg, tmp.buf, tmp.len);
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strbuf_reset(&tmp);
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}
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strbuf_add_separated_string_list(&subs, " ", csub);
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strbuf_addstr(&tmp, _("come back to superproject and run:"));
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strbuf_addf(&tmp, "\n\ngit add %s\n\n", subs.buf);
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strbuf_addstr(&tmp, _("to record the above merge or update"));
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format_submodule_conflict_suggestion(&tmp);
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strbuf_add(&msg, tmp.buf, tmp.len);
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strbuf_reset(&tmp);
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strbuf_addstr(&tmp, _("resolve any other conflicts in the superproject"));
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format_submodule_conflict_suggestion(&tmp);
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strbuf_add(&msg, tmp.buf, tmp.len);
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strbuf_reset(&tmp);
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strbuf_addstr(&tmp, _("commit the resulting index in the superproject"));
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format_submodule_conflict_suggestion(&tmp);
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strbuf_add(&msg, tmp.buf, tmp.len);
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printf("%s", msg.buf);
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strbuf_release(&subs);
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strbuf_release(&tmp);
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strbuf_release(&msg);
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}
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void merge_display_update_messages(struct merge_options *opt,
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int detailed,
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struct merge_result *result)
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@ -4483,6 +4623,8 @@ void merge_display_update_messages(struct merge_options *opt,
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}
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string_list_clear(&olist, 0);
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print_submodule_conflict_suggestion(&opti->conflicted_submodules);
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/* Also include needed rename limit adjustment now */
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diff_warn_rename_limit("merge.renamelimit",
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opti->renames.needed_limit, 0);
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@ -4679,6 +4821,7 @@ static void merge_start(struct merge_options *opt, struct merge_result *result)
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trace2_region_enter("merge", "allocate/init", opt->repo);
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if (opt->priv) {
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clear_or_reinit_internal_opts(opt->priv, 1);
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string_list_init_nodup(&opt->priv->conflicted_submodules);
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trace2_region_leave("merge", "allocate/init", opt->repo);
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return;
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}
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@ -103,8 +103,25 @@ test_expect_success 'setup for merge search' '
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echo "file-c" > file-c &&
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git add file-c &&
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git commit -m "sub-c") &&
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git commit -a -m "c" &&
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git commit -a -m "c")
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'
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test_expect_success 'merging should conflict for non fast-forward' '
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test_when_finished "git -C merge-search reset --hard" &&
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(cd merge-search &&
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git checkout -b test-nonforward-a b &&
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if test "$GIT_TEST_MERGE_ALGORITHM" = ort
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then
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test_must_fail git merge c >actual &&
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sub_expect="go to submodule (sub), and either merge commit $(git -C sub rev-parse --short sub-c)" &&
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grep "$sub_expect" actual
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else
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test_must_fail git merge c 2> actual
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fi)
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'
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test_expect_success 'finish setup for merge-search' '
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(cd merge-search &&
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git checkout -b d a &&
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(cd sub &&
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git checkout -b sub-d sub-b &&
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@ -129,14 +146,16 @@ test_expect_success 'merge with one side as a fast-forward of the other' '
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test_cmp expect actual)
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'
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test_expect_success 'merging should conflict for non fast-forward' '
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test_expect_success 'merging should conflict for non fast-forward (resolution exists)' '
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(cd merge-search &&
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git checkout -b test-nonforward b &&
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git checkout -b test-nonforward-b b &&
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(cd sub &&
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git rev-parse --short sub-d > ../expect) &&
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if test "$GIT_TEST_MERGE_ALGORITHM" = ort
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then
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test_must_fail git merge c >actual
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test_must_fail git merge c >actual &&
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sub_expect="go to submodule (sub), and either merge commit $(git -C sub rev-parse --short sub-c)" &&
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grep "$sub_expect" actual
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else
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test_must_fail git merge c 2> actual
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fi &&
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@ -161,7 +180,9 @@ test_expect_success 'merging should fail for ambiguous common parent' '
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) &&
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if test "$GIT_TEST_MERGE_ALGORITHM" = ort
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then
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test_must_fail git merge c >actual
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test_must_fail git merge c >actual &&
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sub_expect="go to submodule (sub), and either merge commit $(git -C sub rev-parse --short sub-c)" &&
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grep "$sub_expect" actual
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else
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test_must_fail git merge c 2> actual
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fi &&
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@ -205,7 +226,12 @@ test_expect_success 'merging should fail for changes that are backwards' '
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git commit -a -m "f" &&
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git checkout -b test-backward e &&
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test_must_fail git merge f)
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test_must_fail git merge f >actual &&
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if test "$GIT_TEST_MERGE_ALGORITHM" = ort
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then
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sub_expect="go to submodule (sub), and either merge commit $(git -C sub rev-parse --short sub-d)" &&
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grep "$sub_expect" actual
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fi)
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'
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@ -476,4 +502,44 @@ test_expect_failure 'directory/submodule conflict; merge --abort works afterward
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)
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'
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# Setup:
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# - Submodule has 2 commits: a and b
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# - Superproject branch 'a' adds and commits submodule pointing to 'commit a'
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# - Superproject branch 'b' adds and commits submodule pointing to 'commit b'
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# If these two branches are now merged, there is no merge base
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test_expect_success 'setup for null merge base' '
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mkdir no-merge-base &&
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(cd no-merge-base &&
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git init &&
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mkdir sub &&
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(cd sub &&
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git init &&
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echo "file-a" > file-a &&
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git add file-a &&
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git commit -m "commit a") &&
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git commit --allow-empty -m init &&
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git branch init &&
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git checkout -b a init &&
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git add sub &&
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git commit -m "a" &&
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git switch main &&
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(cd sub &&
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echo "file-b" > file-b &&
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git add file-b &&
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git commit -m "commit b"))
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'
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test_expect_success 'merging should fail with no merge base' '
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(cd no-merge-base &&
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git checkout -b b init &&
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git add sub &&
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git commit -m "b" &&
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test_must_fail git merge a >actual &&
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if test "$GIT_TEST_MERGE_ALGORITHM" = ort
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then
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sub_expect="go to submodule (sub), and either merge commit $(git -C sub rev-parse --short HEAD^1)" &&
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grep "$sub_expect" actual
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fi)
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'
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test_done
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@ -104,7 +104,7 @@ test_expect_success 'rebasing submodule that should conflict' '
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test_tick &&
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git commit -m fourth &&
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test_must_fail git rebase --onto HEAD^^ HEAD^ HEAD^0 &&
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test_must_fail git rebase --onto HEAD^^ HEAD^ HEAD^0 >actual_output &&
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git ls-files -s submodule >actual &&
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(
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cd submodule &&
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@ -112,7 +112,12 @@ test_expect_success 'rebasing submodule that should conflict' '
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echo "160000 $(git rev-parse HEAD^^) 2 submodule" &&
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echo "160000 $(git rev-parse HEAD) 3 submodule"
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) >expect &&
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test_cmp expect actual
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test_cmp expect actual &&
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if test "$GIT_TEST_MERGE_ALGORITHM" = ort
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then
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sub_expect="go to submodule (submodule), and either merge commit $(git -C submodule rev-parse --short HEAD^0)" &&
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grep "$sub_expect" actual_output
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fi
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'
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test_done
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