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#include "cache.h"
#include "commit.h"
#include "refs.h"
#include "diff.h"
#include "diffcore.h"
#include "xdiff-interface.h"
#include "ll-merge.h"
#include "dir.h"
#include "notes.h"
#include "notes-merge.h"
#include "strbuf.h"

struct notes_merge_pair {
unsigned char obj[20], base[20], local[20], remote[20];
};

void init_notes_merge_options(struct notes_merge_options *o)
{
memset(o, 0, sizeof(struct notes_merge_options));
strbuf_init(&(o->commit_msg), 0);
o->verbosity = NOTES_MERGE_VERBOSITY_DEFAULT;
}

static int path_to_sha1(const char *path, unsigned char *sha1)
{
char hex_sha1[40];
int i = 0;
while (*path && i < 40) {
if (*path != '/')
hex_sha1[i++] = *path;
path++;
}
if (*path || i != 40)
return -1;
return get_sha1_hex(hex_sha1, sha1);
}

static int verify_notes_filepair(struct diff_filepair *p, unsigned char *sha1)
{
switch (p->status) {
case DIFF_STATUS_MODIFIED:
assert(p->one->mode == p->two->mode);
assert(!is_null_sha1(p->one->sha1));
assert(!is_null_sha1(p->two->sha1));
break;
case DIFF_STATUS_ADDED:
assert(is_null_sha1(p->one->sha1));
break;
case DIFF_STATUS_DELETED:
assert(is_null_sha1(p->two->sha1));
break;
default:
return -1;
}
assert(!strcmp(p->one->path, p->two->path));
return path_to_sha1(p->one->path, sha1);
}

static struct notes_merge_pair *find_notes_merge_pair_pos(
struct notes_merge_pair *list, int len, unsigned char *obj,
int insert_new, int *occupied)
{
/*
* Both diff_tree_remote() and diff_tree_local() tend to process
* merge_pairs in ascending order. Therefore, cache last returned
* index, and search sequentially from there until the appropriate
* position is found.
*
* Since inserts only happen from diff_tree_remote() (which mainly
* _appends_), we don't care that inserting into the middle of the
* list is expensive (using memmove()).
*/
static int last_index;
int i = last_index < len ? last_index : len - 1;
int prev_cmp = 0, cmp = -1;
while (i >= 0 && i < len) {
cmp = hashcmp(obj, list[i].obj);
if (!cmp) /* obj belongs @ i */
break;
else if (cmp < 0 && prev_cmp <= 0) /* obj belongs < i */
i--;
else if (cmp < 0) /* obj belongs between i-1 and i */
break;
else if (cmp > 0 && prev_cmp >= 0) /* obj belongs > i */
i++;
else /* if (cmp > 0) */ { /* obj belongs between i and i+1 */
i++;
break;
}
prev_cmp = cmp;
}
if (i < 0)
i = 0;
/* obj belongs at, or immediately preceding, index i (0 <= i <= len) */

if (!cmp)
*occupied = 1;
else {
*occupied = 0;
if (insert_new && i < len) {
memmove(list + i + 1, list + i,
(len - i) * sizeof(struct notes_merge_pair));
memset(list + i, 0, sizeof(struct notes_merge_pair));
}
}
last_index = i;
return list + i;
}

static unsigned char uninitialized[20] =
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" \
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff";

static struct notes_merge_pair *diff_tree_remote(struct notes_merge_options *o,
const unsigned char *base,
const unsigned char *remote,
int *num_changes)
{
struct diff_options opt;
struct notes_merge_pair *changes;
int i, len = 0;

trace_printf("\tdiff_tree_remote(base = %.7s, remote = %.7s)\n",
sha1_to_hex(base), sha1_to_hex(remote));

diff_setup(&opt);
DIFF_OPT_SET(&opt, RECURSIVE);
opt.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_setup_done(&opt);
diff_tree_sha1(base, remote, "", &opt);
diffcore_std(&opt);

changes = xcalloc(diff_queued_diff.nr, sizeof(struct notes_merge_pair));

for (i = 0; i < diff_queued_diff.nr; i++) {
struct diff_filepair *p = diff_queued_diff.queue[i];
struct notes_merge_pair *mp;
int occupied;
unsigned char obj[20];

if (verify_notes_filepair(p, obj)) {
trace_printf("\t\tCannot merge entry '%s' (%c): "
"%.7s -> %.7s. Skipping!\n", p->one->path,
p->status, sha1_to_hex(p->one->sha1),
sha1_to_hex(p->two->sha1));
continue;
}
mp = find_notes_merge_pair_pos(changes, len, obj, 1, &occupied);
if (occupied) {
/* We've found an addition/deletion pair */
assert(!hashcmp(mp->obj, obj));
if (is_null_sha1(p->one->sha1)) { /* addition */
assert(is_null_sha1(mp->remote));
hashcpy(mp->remote, p->two->sha1);
} else if (is_null_sha1(p->two->sha1)) { /* deletion */
assert(is_null_sha1(mp->base));
hashcpy(mp->base, p->one->sha1);
} else
assert(!"Invalid existing change recorded");
} else {
hashcpy(mp->obj, obj);
hashcpy(mp->base, p->one->sha1);
hashcpy(mp->local, uninitialized);
hashcpy(mp->remote, p->two->sha1);
len++;
}
trace_printf("\t\tStored remote change for %s: %.7s -> %.7s\n",
sha1_to_hex(mp->obj), sha1_to_hex(mp->base),
sha1_to_hex(mp->remote));
}
diff_flush(&opt);
diff_tree_release_paths(&opt);

*num_changes = len;
return changes;
}

static void diff_tree_local(struct notes_merge_options *o,
struct notes_merge_pair *changes, int len,
const unsigned char *base,
const unsigned char *local)
{
struct diff_options opt;
int i;

trace_printf("\tdiff_tree_local(len = %i, base = %.7s, local = %.7s)\n",
len, sha1_to_hex(base), sha1_to_hex(local));

diff_setup(&opt);
DIFF_OPT_SET(&opt, RECURSIVE);
opt.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_setup_done(&opt);
diff_tree_sha1(base, local, "", &opt);
diffcore_std(&opt);

for (i = 0; i < diff_queued_diff.nr; i++) {
struct diff_filepair *p = diff_queued_diff.queue[i];
struct notes_merge_pair *mp;
int match;
unsigned char obj[20];

if (verify_notes_filepair(p, obj)) {
trace_printf("\t\tCannot merge entry '%s' (%c): "
"%.7s -> %.7s. Skipping!\n", p->one->path,
p->status, sha1_to_hex(p->one->sha1),
sha1_to_hex(p->two->sha1));
continue;
}
mp = find_notes_merge_pair_pos(changes, len, obj, 0, &match);
if (!match) {
trace_printf("\t\tIgnoring local-only change for %s: "
"%.7s -> %.7s\n", sha1_to_hex(obj),
sha1_to_hex(p->one->sha1),
sha1_to_hex(p->two->sha1));
continue;
}

assert(!hashcmp(mp->obj, obj));
if (is_null_sha1(p->two->sha1)) { /* deletion */
/*
* Either this is a true deletion (1), or it is part
* of an A/D pair (2), or D/A pair (3):
*
* (1) mp->local is uninitialized; set it to null_sha1
* (2) mp->local is not uninitialized; don't touch it
* (3) mp->local is uninitialized; set it to null_sha1
* (will be overwritten by following addition)
*/
if (!hashcmp(mp->local, uninitialized))
hashclr(mp->local);
} else if (is_null_sha1(p->one->sha1)) { /* addition */
/*
* Either this is a true addition (1), or it is part
* of an A/D pair (2), or D/A pair (3):
*
* (1) mp->local is uninitialized; set to p->two->sha1
* (2) mp->local is uninitialized; set to p->two->sha1
* (3) mp->local is null_sha1; set to p->two->sha1
*/
assert(is_null_sha1(mp->local) ||
!hashcmp(mp->local, uninitialized));
hashcpy(mp->local, p->two->sha1);
} else { /* modification */
/*
* This is a true modification. p->one->sha1 shall
* match mp->base, and mp->local shall be uninitialized.
* Set mp->local to p->two->sha1.
*/
assert(!hashcmp(p->one->sha1, mp->base));
assert(!hashcmp(mp->local, uninitialized));
hashcpy(mp->local, p->two->sha1);
}
trace_printf("\t\tStored local change for %s: %.7s -> %.7s\n",
sha1_to_hex(mp->obj), sha1_to_hex(mp->base),
sha1_to_hex(mp->local));
}
diff_flush(&opt);
diff_tree_release_paths(&opt);
}

static void check_notes_merge_worktree(struct notes_merge_options *o)
{
if (!o->has_worktree) {
/*
* Must establish NOTES_MERGE_WORKTREE.
* Abort if NOTES_MERGE_WORKTREE already exists
*/
if (file_exists(git_path(NOTES_MERGE_WORKTREE)) &&
!is_empty_dir(git_path(NOTES_MERGE_WORKTREE))) {
if (advice_resolve_conflict)
die("You have not concluded your previous "
"notes merge (%s exists).\nPlease, use "
"'git notes merge --commit' or 'git notes "
"merge --abort' to commit/abort the "
"previous merge before you start a new "
"notes merge.", git_path("NOTES_MERGE_*"));
else
die("You have not concluded your notes merge "
"(%s exists).", git_path("NOTES_MERGE_*"));
}

if (safe_create_leading_directories(git_path(
NOTES_MERGE_WORKTREE "/.test")))
die_errno("unable to create directory %s",
git_path(NOTES_MERGE_WORKTREE));
o->has_worktree = 1;
} else if (!file_exists(git_path(NOTES_MERGE_WORKTREE)))
/* NOTES_MERGE_WORKTREE should already be established */
die("missing '%s'. This should not happen",
git_path(NOTES_MERGE_WORKTREE));
}

static void write_buf_to_worktree(const unsigned char *obj,
const char *buf, unsigned long size)
{
int fd;
char *path = git_path(NOTES_MERGE_WORKTREE "/%s", sha1_to_hex(obj));
if (safe_create_leading_directories(path))
die_errno("unable to create directory for '%s'", path);
if (file_exists(path))
die("found existing file at '%s'", path);

fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0666);
if (fd < 0)
die_errno("failed to open '%s'", path);

while (size > 0) {
long ret = write_in_full(fd, buf, size);
if (ret < 0) {
/* Ignore epipe */
if (errno == EPIPE)
break;
die_errno("notes-merge");
} else if (!ret) {
die("notes-merge: disk full?");
}
size -= ret;
buf += ret;
}

close(fd);
}

static void write_note_to_worktree(const unsigned char *obj,
const unsigned char *note)
{
enum object_type type;
unsigned long size;
void *buf = read_sha1_file(note, &type, &size);

if (!buf)
die("cannot read note %s for object %s",
sha1_to_hex(note), sha1_to_hex(obj));
if (type != OBJ_BLOB)
die("blob expected in note %s for object %s",
sha1_to_hex(note), sha1_to_hex(obj));
write_buf_to_worktree(obj, buf, size);
free(buf);
}

static int ll_merge_in_worktree(struct notes_merge_options *o,
struct notes_merge_pair *p)
{
mmbuffer_t result_buf;
mmfile_t base, local, remote;
int status;

read_mmblob(&base, p->base);
read_mmblob(&local, p->local);
read_mmblob(&remote, p->remote);

status = ll_merge(&result_buf, sha1_to_hex(p->obj), &base, NULL,
&local, o->local_ref, &remote, o->remote_ref, NULL);

free(base.ptr);
free(local.ptr);
free(remote.ptr);

if ((status < 0) || !result_buf.ptr)
die("Failed to execute internal merge");

write_buf_to_worktree(p->obj, result_buf.ptr, result_buf.size);
free(result_buf.ptr);

return status;
}

static int merge_one_change_manual(struct notes_merge_options *o,
struct notes_merge_pair *p,
struct notes_tree *t)
{
const char *lref = o->local_ref ? o->local_ref : "local version";
const char *rref = o->remote_ref ? o->remote_ref : "remote version";

trace_printf("\t\t\tmerge_one_change_manual(obj = %.7s, base = %.7s, "
"local = %.7s, remote = %.7s)\n",
sha1_to_hex(p->obj), sha1_to_hex(p->base),
sha1_to_hex(p->local), sha1_to_hex(p->remote));

/* add "Conflicts:" section to commit message first time through */
if (!o->has_worktree)
strbuf_addstr(&(o->commit_msg), "\n\nConflicts:\n");

strbuf_addf(&(o->commit_msg), "\t%s\n", sha1_to_hex(p->obj));

if (o->verbosity >= 2)
printf("Auto-merging notes for %s\n", sha1_to_hex(p->obj));
check_notes_merge_worktree(o);
if (is_null_sha1(p->local)) {
/* D/F conflict, checkout p->remote */
assert(!is_null_sha1(p->remote));
if (o->verbosity >= 1)
printf("CONFLICT (delete/modify): Notes for object %s "
"deleted in %s and modified in %s. Version from %s "
"left in tree.\n",
sha1_to_hex(p->obj), lref, rref, rref);
write_note_to_worktree(p->obj, p->remote);
} else if (is_null_sha1(p->remote)) {
/* D/F conflict, checkout p->local */
assert(!is_null_sha1(p->local));
if (o->verbosity >= 1)
printf("CONFLICT (delete/modify): Notes for object %s "
"deleted in %s and modified in %s. Version from %s "
"left in tree.\n",
sha1_to_hex(p->obj), rref, lref, lref);
write_note_to_worktree(p->obj, p->local);
} else {
/* "regular" conflict, checkout result of ll_merge() */
const char *reason = "content";
if (is_null_sha1(p->base))
reason = "add/add";
assert(!is_null_sha1(p->local));
assert(!is_null_sha1(p->remote));
if (o->verbosity >= 1)
printf("CONFLICT (%s): Merge conflict in notes for "
"object %s\n", reason, sha1_to_hex(p->obj));
ll_merge_in_worktree(o, p);
}

trace_printf("\t\t\tremoving from partial merge result\n");
remove_note(t, p->obj);

return 1;
}

static int merge_one_change(struct notes_merge_options *o,
struct notes_merge_pair *p, struct notes_tree *t)
{
/*
* Return 0 if change is successfully resolved (stored in notes_tree).
* Return 1 is change results in a conflict (NOT stored in notes_tree,
* but instead written to NOTES_MERGE_WORKTREE with conflict markers).
*/
switch (o->strategy) {
case NOTES_MERGE_RESOLVE_MANUAL:
return merge_one_change_manual(o, p, t);
case NOTES_MERGE_RESOLVE_OURS:
if (o->verbosity >= 2)
printf("Using local notes for %s\n",
sha1_to_hex(p->obj));
/* nothing to do */
return 0;
case NOTES_MERGE_RESOLVE_THEIRS:
if (o->verbosity >= 2)
printf("Using remote notes for %s\n",
sha1_to_hex(p->obj));
if (add_note(t, p->obj, p->remote, combine_notes_overwrite))
die("BUG: combine_notes_overwrite failed");
return 0;
case NOTES_MERGE_RESOLVE_UNION:
if (o->verbosity >= 2)
printf("Concatenating local and remote notes for %s\n",
sha1_to_hex(p->obj));
if (add_note(t, p->obj, p->remote, combine_notes_concatenate))
die("failed to concatenate notes "
"(combine_notes_concatenate)");
return 0;
case NOTES_MERGE_RESOLVE_CAT_SORT_UNIQ:
if (o->verbosity >= 2)
printf("Concatenating unique lines in local and remote "
"notes for %s\n", sha1_to_hex(p->obj));
if (add_note(t, p->obj, p->remote, combine_notes_cat_sort_uniq))
die("failed to concatenate notes "
"(combine_notes_cat_sort_uniq)");
return 0;
}
die("Unknown strategy (%i).", o->strategy);
}

static int merge_changes(struct notes_merge_options *o,
struct notes_merge_pair *changes, int *num_changes,
struct notes_tree *t)
{
int i, conflicts = 0;

trace_printf("\tmerge_changes(num_changes = %i)\n", *num_changes);
for (i = 0; i < *num_changes; i++) {
struct notes_merge_pair *p = changes + i;
trace_printf("\t\t%.7s: %.7s -> %.7s/%.7s\n",
sha1_to_hex(p->obj), sha1_to_hex(p->base),
sha1_to_hex(p->local), sha1_to_hex(p->remote));

if (!hashcmp(p->base, p->remote)) {
/* no remote change; nothing to do */
trace_printf("\t\t\tskipping (no remote change)\n");
} else if (!hashcmp(p->local, p->remote)) {
/* same change in local and remote; nothing to do */
trace_printf("\t\t\tskipping (local == remote)\n");
} else if (!hashcmp(p->local, uninitialized) ||
!hashcmp(p->local, p->base)) {
/* no local change; adopt remote change */
trace_printf("\t\t\tno local change, adopted remote\n");
if (add_note(t, p->obj, p->remote,
combine_notes_overwrite))
die("BUG: combine_notes_overwrite failed");
} else {
/* need file-level merge between local and remote */
trace_printf("\t\t\tneed content-level merge\n");
conflicts += merge_one_change(o, p, t);
}
}

return conflicts;
}

static int merge_from_diffs(struct notes_merge_options *o,
const unsigned char *base,
const unsigned char *local,
const unsigned char *remote, struct notes_tree *t)
{
struct notes_merge_pair *changes;
int num_changes, conflicts;

trace_printf("\tmerge_from_diffs(base = %.7s, local = %.7s, "
"remote = %.7s)\n", sha1_to_hex(base), sha1_to_hex(local),
sha1_to_hex(remote));

changes = diff_tree_remote(o, base, remote, &num_changes);
diff_tree_local(o, changes, num_changes, base, local);

conflicts = merge_changes(o, changes, &num_changes, t);
free(changes);

if (o->verbosity >= 4)
printf(t->dirty ?
"Merge result: %i unmerged notes and a dirty notes tree\n" :
"Merge result: %i unmerged notes and a clean notes tree\n",
conflicts);

return conflicts ? -1 : 1;
}

void create_notes_commit(struct notes_tree *t, struct commit_list *parents,
const struct strbuf *msg, unsigned char *result_sha1)
{
unsigned char tree_sha1[20];

assert(t->initialized);

if (write_notes_tree(t, tree_sha1))
die("Failed to write notes tree to database");

if (!parents) {
/* Deduce parent commit from t->ref */
unsigned char parent_sha1[20];
if (!read_ref(t->ref, parent_sha1)) {
struct commit *parent = lookup_commit(parent_sha1);
if (!parent || parse_commit(parent))
die("Failed to find/parse commit %s", t->ref);
commit_list_insert(parent, &parents);
}
/* else: t->ref points to nothing, assume root/orphan commit */
}

if (commit_tree(msg, tree_sha1, parents, result_sha1, NULL, NULL))
die("Failed to commit notes tree to database");
}

int notes_merge(struct notes_merge_options *o,
struct notes_tree *local_tree,
unsigned char *result_sha1)
{
unsigned char local_sha1[20], remote_sha1[20];
struct commit *local, *remote;
struct commit_list *bases = NULL;
const unsigned char *base_sha1, *base_tree_sha1;
int result = 0;

assert(o->local_ref && o->remote_ref);
assert(!strcmp(o->local_ref, local_tree->ref));
hashclr(result_sha1);

trace_printf("notes_merge(o->local_ref = %s, o->remote_ref = %s)\n",
o->local_ref, o->remote_ref);

/* Dereference o->local_ref into local_sha1 */
if (read_ref_full(o->local_ref, local_sha1, 0, NULL))
die("Failed to resolve local notes ref '%s'", o->local_ref);
else if (!check_refname_format(o->local_ref, 0) &&
is_null_sha1(local_sha1))
local = NULL; /* local_sha1 == null_sha1 indicates unborn ref */
else if (!(local = lookup_commit_reference(local_sha1)))
die("Could not parse local commit %s (%s)",
sha1_to_hex(local_sha1), o->local_ref);
trace_printf("\tlocal commit: %.7s\n", sha1_to_hex(local_sha1));

/* Dereference o->remote_ref into remote_sha1 */
if (get_sha1(o->remote_ref, remote_sha1)) {
/*
* Failed to get remote_sha1. If o->remote_ref looks like an
* unborn ref, perform the merge using an empty notes tree.
*/
if (!check_refname_format(o->remote_ref, 0)) {
hashclr(remote_sha1);
remote = NULL;
} else {
die("Failed to resolve remote notes ref '%s'",
o->remote_ref);
}
} else if (!(remote = lookup_commit_reference(remote_sha1))) {
die("Could not parse remote commit %s (%s)",
sha1_to_hex(remote_sha1), o->remote_ref);
}
trace_printf("\tremote commit: %.7s\n", sha1_to_hex(remote_sha1));

if (!local && !remote)
die("Cannot merge empty notes ref (%s) into empty notes ref "
"(%s)", o->remote_ref, o->local_ref);
if (!local) {
/* result == remote commit */
hashcpy(result_sha1, remote_sha1);
goto found_result;
}
if (!remote) {
/* result == local commit */
hashcpy(result_sha1, local_sha1);
goto found_result;
}
assert(local && remote);

/* Find merge bases */
bases = get_merge_bases(local, remote, 1);
if (!bases) {
base_sha1 = null_sha1;
base_tree_sha1 = EMPTY_TREE_SHA1_BIN;
if (o->verbosity >= 4)
printf("No merge base found; doing history-less merge\n");
} else if (!bases->next) {
base_sha1 = bases->item->object.sha1;
base_tree_sha1 = bases->item->tree->object.sha1;
if (o->verbosity >= 4)
printf("One merge base found (%.7s)\n",
sha1_to_hex(base_sha1));
} else {
/* TODO: How to handle multiple merge-bases? */
base_sha1 = bases->item->object.sha1;
base_tree_sha1 = bases->item->tree->object.sha1;
if (o->verbosity >= 3)
printf("Multiple merge bases found. Using the first "
"(%.7s)\n", sha1_to_hex(base_sha1));
}

if (o->verbosity >= 4)
printf("Merging remote commit %.7s into local commit %.7s with "
"merge-base %.7s\n", sha1_to_hex(remote->object.sha1),
sha1_to_hex(local->object.sha1),
sha1_to_hex(base_sha1));

if (!hashcmp(remote->object.sha1, base_sha1)) {
/* Already merged; result == local commit */
if (o->verbosity >= 2)
printf("Already up-to-date!\n");
hashcpy(result_sha1, local->object.sha1);
goto found_result;
}
if (!hashcmp(local->object.sha1, base_sha1)) {
/* Fast-forward; result == remote commit */
if (o->verbosity >= 2)
printf("Fast-forward\n");
hashcpy(result_sha1, remote->object.sha1);
goto found_result;
}

result = merge_from_diffs(o, base_tree_sha1, local->tree->object.sha1,
remote->tree->object.sha1, local_tree);

if (result != 0) { /* non-trivial merge (with or without conflicts) */
/* Commit (partial) result */
struct commit_list *parents = NULL;
commit_list_insert(remote, &parents); /* LIFO order */
commit_list_insert(local, &parents);
create_notes_commit(local_tree, parents, &o->commit_msg,
result_sha1);
}

found_result:
free_commit_list(bases);
strbuf_release(&(o->commit_msg));
trace_printf("notes_merge(): result = %i, result_sha1 = %.7s\n",
result, sha1_to_hex(result_sha1));
return result;
}

int notes_merge_commit(struct notes_merge_options *o,
struct notes_tree *partial_tree,
struct commit *partial_commit,
unsigned char *result_sha1)
{
/*
* Iterate through files in .git/NOTES_MERGE_WORKTREE and add all
* found notes to 'partial_tree'. Write the updated notes tree to
* the DB, and commit the resulting tree object while reusing the
* commit message and parents from 'partial_commit'.
* Finally store the new commit object SHA1 into 'result_sha1'.
*/
DIR *dir;
struct dirent *e;
struct strbuf path = STRBUF_INIT;
char *msg = strstr(partial_commit->buffer, "\n\n");
struct strbuf sb_msg = STRBUF_INIT;
int baselen;

strbuf_addstr(&path, git_path(NOTES_MERGE_WORKTREE));
if (o->verbosity >= 3)
printf("Committing notes in notes merge worktree at %s\n",
path.buf);

if (!msg || msg[2] == '\0')
die("partial notes commit has empty message");
msg += 2;

dir = opendir(path.buf);
if (!dir)
die_errno("could not open %s", path.buf);

strbuf_addch(&path, '/');
baselen = path.len;
while ((e = readdir(dir)) != NULL) {
struct stat st;
unsigned char obj_sha1[20], blob_sha1[20];

if (is_dot_or_dotdot(e->d_name))
continue;

if (strlen(e->d_name) != 40 || get_sha1_hex(e->d_name, obj_sha1)) {
if (o->verbosity >= 3)
printf("Skipping non-SHA1 entry '%s%s'\n",
path.buf, e->d_name);
continue;
}

strbuf_addstr(&path, e->d_name);
/* write file as blob, and add to partial_tree */
if (stat(path.buf, &st))
die_errno("Failed to stat '%s'", path.buf);
if (index_path(blob_sha1, path.buf, &st, HASH_WRITE_OBJECT))
die("Failed to write blob object from '%s'", path.buf);
if (add_note(partial_tree, obj_sha1, blob_sha1, NULL))
die("Failed to add resolved note '%s' to notes tree",
path.buf);
if (o->verbosity >= 4)
printf("Added resolved note for object %s: %s\n",
sha1_to_hex(obj_sha1), sha1_to_hex(blob_sha1));
strbuf_setlen(&path, baselen);
}

strbuf_attach(&sb_msg, msg, strlen(msg), strlen(msg) + 1);
create_notes_commit(partial_tree, partial_commit->parents, &sb_msg,
result_sha1);
if (o->verbosity >= 4)
printf("Finalized notes merge commit: %s\n",
sha1_to_hex(result_sha1));
strbuf_release(&path);
closedir(dir);
return 0;
}

int notes_merge_abort(struct notes_merge_options *o)
{
/*
* Remove all files within .git/NOTES_MERGE_WORKTREE. We do not remove
* the .git/NOTES_MERGE_WORKTREE directory itself, since it might be
* the current working directory of the user.
*/
struct strbuf buf = STRBUF_INIT;
int ret;

strbuf_addstr(&buf, git_path(NOTES_MERGE_WORKTREE));
if (o->verbosity >= 3)
printf("Removing notes merge worktree at %s/*\n", buf.buf);
ret = remove_dir_recursively(&buf, REMOVE_DIR_KEEP_TOPLEVEL);
strbuf_release(&buf);
return ret;
}
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