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am -3: do not let failed merge from completing the error codepath

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When "am" was rewritten in C, the codepath for falling back to
three-way merge was mistakenly made to make an internal call to
merge-recursive, disabling the error reporting code for certain
types of errors merge-recursive detects and reports by calling
die().

This is a quick-fix for correctness.  The ideal endgame would be to
replace run_command() in run_fallback_merge_recursive() with a
direct call after making sure that internal call to merge-recursive
does not die().

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2015-10-09 13:38:30 -07:00
parent 22f698cb18
commit c63d4b2fe8
1 changed files with 33 additions and 16 deletions
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49
builtin/am.c
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@ -1589,6 +1589,38 @@ static int build_fake_ancestor(const struct am_state *state, const char *index_f
return 0;
}
/**
* Do the three-way merge using fake ancestor, his 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 *his_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(his_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(his_tree));
status = run_command(&cp) ? (-1) : 0;
discard_cache();
read_cache();
return status;
}
/**
* Attempt a threeway merge, using index_path as the temporary index.
*/
@ -1596,10 +1628,6 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
{
unsigned char orig_tree[GIT_SHA1_RAWSZ], his_tree[GIT_SHA1_RAWSZ],
our_tree[GIT_SHA1_RAWSZ];
const unsigned char *bases[1] = {orig_tree};
struct merge_options o;
struct commit *result;
char *his_tree_name;
if (get_sha1("HEAD", our_tree) < 0)
hashcpy(our_tree, EMPTY_TREE_SHA1_BIN);
@ -1651,22 +1679,11 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
* changes.
*/
init_merge_options(&o);
o.branch1 = "HEAD";
his_tree_name = xstrfmt("%.*s", linelen(state->msg), state->msg);
o.branch2 = his_tree_name;
if (state->quiet)
o.verbosity = 0;
if (merge_recursive_generic(&o, our_tree, his_tree, 1, bases, &result)) {
if (run_fallback_merge_recursive(state, orig_tree, our_tree, his_tree)) {
rerere(state->allow_rerere_autoupdate);
free(his_tree_name);
return error(_("Failed to merge in the changes."));
}
free(his_tree_name);
return 0;
}