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Merge branch 'js/am-3-merge-recursive-direct'

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"git am -3" calls "git merge-recursive" when it needs to fall back
to a three-way merge; this call has been turned into an internal
subroutine call instead of spawning a separate subprocess.

* js/am-3-merge-recursive-direct:
  merge-recursive: flush output buffer even when erroring out
  merge_trees(): ensure that the callers release output buffer
  merge-recursive: offer an option to retain the output in 'obuf'
  merge-recursive: write the commit title in one go
  merge-recursive: flush output buffer before printing error messages
  am -3: use merge_recursive() directly again
  merge-recursive: switch to returning errors instead of dying
  merge-recursive: handle return values indicating errors
  merge-recursive: allow write_tree_from_memory() to error out
  merge-recursive: avoid returning a wholesale struct
  merge_recursive: abort properly upon errors
  prepare the builtins for a libified merge_recursive()
  merge-recursive: clarify code in was_tracked()
  die(_("BUG")): avoid translating bug messages
  die("bug"): report bugs consistently
  t5520: verify that `pull --rebase` shows the helpful advice when failing
This commit is contained in:
Junio C Hamano
2016-08-10 12:33:20 -07:00
parent 7a3ea66633 6999bc7074
commit 1a5f1a3f25
15 changed files with 419 additions and 294 deletions
Download Patch File Download Diff File Expand all files Collapse all files

62
builtin/am.c
View File

@ -1578,48 +1578,19 @@ static int build_fake_ancestor(const struct am_state *state, const char *index_f
return 0;
}
/**
* Do the three-way merge using fake ancestor, their tree constructed
* from the fake ancestor and the postimage of the patch, and our
* state.
*/
static int run_fallback_merge_recursive(const struct am_state *state,
unsigned char *orig_tree,
unsigned char *our_tree,
unsigned char *their_tree)
{
struct child_process cp = CHILD_PROCESS_INIT;
int status;
cp.git_cmd = 1;
argv_array_pushf(&cp.env_array, "GITHEAD_%s=%.*s",
sha1_to_hex(their_tree), linelen(state->msg), state->msg);
if (state->quiet)
argv_array_push(&cp.env_array, "GIT_MERGE_VERBOSITY=0");
argv_array_push(&cp.args, "merge-recursive");
argv_array_push(&cp.args, sha1_to_hex(orig_tree));
argv_array_push(&cp.args, "--");
argv_array_push(&cp.args, sha1_to_hex(our_tree));
argv_array_push(&cp.args, sha1_to_hex(their_tree));
status = run_command(&cp) ? (-1) : 0;
discard_cache();
read_cache();
return status;
}
/**
* Attempt a threeway merge, using index_path as the temporary index.
*/
static int fall_back_threeway(const struct am_state *state, const char *index_path)
{
unsigned char orig_tree[GIT_SHA1_RAWSZ], their_tree[GIT_SHA1_RAWSZ],
our_tree[GIT_SHA1_RAWSZ];
struct object_id orig_tree, their_tree, our_tree;
const struct object_id *bases[1] = { &orig_tree };
struct merge_options o;
struct commit *result;
char *their_tree_name;
if (get_sha1("HEAD", our_tree) < 0)
hashcpy(our_tree, EMPTY_TREE_SHA1_BIN);
if (get_oid("HEAD", &our_tree) < 0)
hashcpy(our_tree.hash, EMPTY_TREE_SHA1_BIN);
if (build_fake_ancestor(state, index_path))
return error("could not build fake ancestor");
@ -1627,7 +1598,7 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
discard_cache();
read_cache_from(index_path);
if (write_index_as_tree(orig_tree, &the_index, index_path, 0, NULL))
if (write_index_as_tree(orig_tree.hash, &the_index, index_path, 0, NULL))
return error(_("Repository lacks necessary blobs to fall back on 3-way merge."));
say(state, stdout, _("Using index info to reconstruct a base tree..."));
@ -1643,7 +1614,7 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
init_revisions(&rev_info, NULL);
rev_info.diffopt.output_format = DIFF_FORMAT_NAME_STATUS;
diff_opt_parse(&rev_info.diffopt, &diff_filter_str, 1, rev_info.prefix);
add_pending_sha1(&rev_info, "HEAD", our_tree, 0);
add_pending_sha1(&rev_info, "HEAD", our_tree.hash, 0);
diff_setup_done(&rev_info.diffopt);
run_diff_index(&rev_info, 1);
}
@ -1652,7 +1623,7 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
return error(_("Did you hand edit your patch?\n"
"It does not apply to blobs recorded in its index."));
if (write_index_as_tree(their_tree, &the_index, index_path, 0, NULL))
if (write_index_as_tree(their_tree.hash, &the_index, index_path, 0, NULL))
return error("could not write tree");
say(state, stdout, _("Falling back to patching base and 3-way merge..."));
@ -1668,11 +1639,22 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
* changes.
*/
if (run_fallback_merge_recursive(state, orig_tree, our_tree, their_tree)) {
init_merge_options(&o);
o.branch1 = "HEAD";
their_tree_name = xstrfmt("%.*s", linelen(state->msg), state->msg);
o.branch2 = their_tree_name;
if (state->quiet)
o.verbosity = 0;
if (merge_recursive_generic(&o, &our_tree, &their_tree, 1, bases, &result)) {
rerere(state->allow_rerere_autoupdate);
free(their_tree_name);
return error(_("Failed to merge in the changes."));
}
free(their_tree_name);
return 0;
}