Last October, we had to change this code to run `git merge-recursive`
in a child process: git-am wants to print some helpful advice when the
merge failed, but the code in question was not prepared to return, it
die()d instead.
We are finally at a point when the code *is* prepared to return errors,
and can avoid the child process again.
This reverts commit c63d4b2 (am -3: do not let failed merge from
completing the error codepath, 2015-10-09), with the necessary changes
to adjust for the fact that Git's source code changed in the meantime
(such as: using OIDs instead of hashes in the recursive merge, and a
removed gender bias).
Note: the code now calls merge_recursive_generic() again. Unlike
merge_trees() and merge_recursive(), this function returns 0 upon success,
as most of Git's functions. Therefore, the error value -1 naturally is
handled correctly, and we do not have to take care of it specifically.
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
builtin/am.c | 62 +++++++++++++++++++++---------------------------------------
1 file changed, 22 insertions(+), 40 deletions(-)
diff --git a/builtin/am.c b/builtin/am.c
index b77bf11..cfb79ea 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1579,47 +1579,18 @@ static int build_fake_ancestor(const struct am_state *state, const char *index_f
}
/**
- * 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;
}
--
2.9.0.281.g286a8d9
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