git/fmt-merge-msg.c

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#include "config.h"
#include "refs.h"
#include "object-store.h"
#include "diff.h"
#include "diff-merges.h"
#include "revision.h"
#include "tag.h"
#include "string-list.h"
#include "branch.h"
#include "fmt-merge-msg.h"
#include "commit-reach.h"
#include "gpg-interface.h"
static int use_branch_desc;
static int suppress_dest_pattern_seen;
static struct string_list suppress_dest_patterns = STRING_LIST_INIT_DUP;
int fmt_merge_msg_config(const char *key, const char *value, void *cb)
{
int status = 0;
if (!strcmp(key, "merge.log") || !strcmp(key, "merge.summary")) {
int is_bool;
merge_log_config = git_config_bool_or_int(key, value, &is_bool);
if (!is_bool && merge_log_config < 0)
return error("%s: negative length %s", key, value);
if (is_bool && merge_log_config)
merge_log_config = DEFAULT_MERGE_LOG_LEN;
} else if (!strcmp(key, "merge.branchdesc")) {
use_branch_desc = git_config_bool(key, value);
} else if (!strcmp(key, "merge.suppressdest")) {
if (!value)
return config_error_nonbool(key);
if (!*value)
string_list_clear(&suppress_dest_patterns, 0);
else
string_list_append(&suppress_dest_patterns, value);
suppress_dest_pattern_seen = 1;
} else {
status = git_gpg_config(key, value, NULL);
if (status)
return status;
return git_default_config(key, value, cb);
}
return 0;
}
/* merge data per repository where the merged tips came from */
struct src_data {
struct string_list branch, tag, r_branch, generic;
int head_status;
};
struct origin_data {
struct object_id oid;
unsigned is_local_branch:1;
};
static void init_src_data(struct src_data *data)
{
data->branch.strdup_strings = 1;
data->tag.strdup_strings = 1;
data->r_branch.strdup_strings = 1;
data->generic.strdup_strings = 1;
}
static struct string_list srcs = STRING_LIST_INIT_DUP;
static struct string_list origins = STRING_LIST_INIT_DUP;
struct merge_parents {
int alloc, nr;
struct merge_parent {
struct object_id given;
struct object_id commit;
unsigned char used;
} *item;
};
/*
* I know, I know, this is inefficient, but you won't be pulling and merging
* hundreds of heads at a time anyway.
*/
static struct merge_parent *find_merge_parent(struct merge_parents *table,
struct object_id *given,
struct object_id *commit)
{
int i;
for (i = 0; i < table->nr; i++) {
if (given && !oideq(&table->item[i].given, given))
continue;
if (commit && !oideq(&table->item[i].commit, commit))
continue;
return &table->item[i];
}
return NULL;
}
static void add_merge_parent(struct merge_parents *table,
struct object_id *given,
struct object_id *commit)
{
if (table->nr && find_merge_parent(table, given, commit))
return;
ALLOC_GROW(table->item, table->nr + 1, table->alloc);
oidcpy(&table->item[table->nr].given, given);
oidcpy(&table->item[table->nr].commit, commit);
table->item[table->nr].used = 0;
table->nr++;
}
static int handle_line(char *line, struct merge_parents *merge_parents)
{
int i, len = strlen(line);
struct origin_data *origin_data;
char *src;
const char *origin, *tag_name;
char *to_free = NULL;
struct src_data *src_data;
struct string_list_item *item;
int pulling_head = 0;
struct object_id oid;
const unsigned hexsz = the_hash_algo->hexsz;
if (len < hexsz + 3 || line[hexsz] != '\t')
return 1;
if (starts_with(line + hexsz + 1, "not-for-merge"))
return 0;
if (line[hexsz + 1] != '\t')
return 2;
i = get_oid_hex(line, &oid);
if (i)
return 3;
if (!find_merge_parent(merge_parents, &oid, NULL))
return 0; /* subsumed by other parents */
CALLOC_ARRAY(origin_data, 1);
oidcpy(&origin_data->oid, &oid);
if (line[len - 1] == '\n')
line[len - 1] = 0;
line += hexsz + 2;
/*
* At this point, line points at the beginning of comment e.g.
* "branch 'frotz' of git://that/repository.git".
* Find the repository name and point it with src.
*/
src = strstr(line, " of ");
if (src) {
*src = 0;
src += 4;
pulling_head = 0;
} else {
src = line;
pulling_head = 1;
}
item = unsorted_string_list_lookup(&srcs, src);
if (!item) {
item = string_list_append(&srcs, src);
item->util = xcalloc(1, sizeof(struct src_data));
init_src_data(item->util);
}
src_data = item->util;
if (pulling_head) {
origin = src;
src_data->head_status |= 1;
} else if (skip_prefix(line, "branch ", &origin)) {
origin_data->is_local_branch = 1;
string_list_append(&src_data->branch, origin);
src_data->head_status |= 2;
} else if (skip_prefix(line, "tag ", &tag_name)) {
origin = line;
string_list_append(&src_data->tag, tag_name);
src_data->head_status |= 2;
} else if (skip_prefix(line, "remote-tracking branch ", &origin)) {
string_list_append(&src_data->r_branch, origin);
src_data->head_status |= 2;
} else {
origin = src;
string_list_append(&src_data->generic, line);
src_data->head_status |= 2;
}
if (!strcmp(".", src) || !strcmp(src, origin)) {
int len = strlen(origin);
if (origin[0] == '\'' && origin[len - 1] == '\'')
origin = to_free = xmemdupz(origin + 1, len - 2);
} else
origin = to_free = xstrfmt("%s of %s", origin, src);
if (strcmp(".", src))
origin_data->is_local_branch = 0;
string_list_append(&origins, origin)->util = origin_data;
free(to_free);
return 0;
}
static void print_joined(const char *singular, const char *plural,
struct string_list *list, struct strbuf *out)
{
if (list->nr == 0)
return;
if (list->nr == 1) {
strbuf_addf(out, "%s%s", singular, list->items[0].string);
} else {
int i;
strbuf_addstr(out, plural);
for (i = 0; i < list->nr - 1; i++)
strbuf_addf(out, "%s%s", i > 0 ? ", " : "",
list->items[i].string);
strbuf_addf(out, " and %s", list->items[list->nr - 1].string);
}
}
static void add_branch_desc(struct strbuf *out, const char *name)
{
struct strbuf desc = STRBUF_INIT;
if (!read_branch_desc(&desc, name)) {
const char *bp = desc.buf;
while (*bp) {
const char *ep = strchrnul(bp, '\n');
if (*ep)
ep++;
strbuf_addf(out, " : %.*s", (int)(ep - bp), bp);
bp = ep;
}
strbuf_complete_line(out);
}
strbuf_release(&desc);
}
#define util_as_integral(elem) ((intptr_t)((elem)->util))
static void record_person_from_buf(int which, struct string_list *people,
const char *buffer)
{
char *name_buf, *name, *name_end;
struct string_list_item *elem;
const char *field;
field = (which == 'a') ? "\nauthor " : "\ncommitter ";
name = strstr(buffer, field);
if (!name)
return;
name += strlen(field);
name_end = strchrnul(name, '<');
if (*name_end)
name_end--;
while (isspace(*name_end) && name <= name_end)
name_end--;
if (name_end < name)
return;
name_buf = xmemdupz(name, name_end - name + 1);
elem = string_list_lookup(people, name_buf);
if (!elem) {
elem = string_list_insert(people, name_buf);
elem->util = (void *)0;
}
elem->util = (void*)(util_as_integral(elem) + 1);
free(name_buf);
}
static void record_person(int which, struct string_list *people,
struct commit *commit)
{
const char *buffer = get_commit_buffer(commit, NULL);
record_person_from_buf(which, people, buffer);
unuse_commit_buffer(commit, buffer);
}
static int cmp_string_list_util_as_integral(const void *a_, const void *b_)
{
const struct string_list_item *a = a_, *b = b_;
return util_as_integral(b) - util_as_integral(a);
}
static void add_people_count(struct strbuf *out, struct string_list *people)
{
if (people->nr == 1)
strbuf_addstr(out, people->items[0].string);
else if (people->nr == 2)
strbuf_addf(out, "%s (%d) and %s (%d)",
people->items[0].string,
(int)util_as_integral(&people->items[0]),
people->items[1].string,
(int)util_as_integral(&people->items[1]));
else if (people->nr)
strbuf_addf(out, "%s (%d) and others",
people->items[0].string,
(int)util_as_integral(&people->items[0]));
}
static void credit_people(struct strbuf *out,
struct string_list *them,
int kind)
{
const char *label;
const char *me;
if (kind == 'a') {
label = "By";
me = git_author_info(IDENT_NO_DATE);
} else {
label = "Via";
me = git_committer_info(IDENT_NO_DATE);
}
if (!them->nr ||
(them->nr == 1 &&
me &&
skip_prefix(me, them->items->string, &me) &&
starts_with(me, " <")))
return;
strbuf_addf(out, "\n%c %s ", comment_line_char, label);
add_people_count(out, them);
}
static void add_people_info(struct strbuf *out,
struct string_list *authors,
struct string_list *committers)
{
QSORT(authors->items, authors->nr,
cmp_string_list_util_as_integral);
QSORT(committers->items, committers->nr,
cmp_string_list_util_as_integral);
credit_people(out, authors, 'a');
credit_people(out, committers, 'c');
}
static void shortlog(const char *name,
struct origin_data *origin_data,
struct commit *head,
struct rev_info *rev,
struct fmt_merge_msg_opts *opts,
struct strbuf *out)
{
int i, count = 0;
struct commit *commit;
struct object *branch;
struct string_list subjects = STRING_LIST_INIT_DUP;
struct string_list authors = STRING_LIST_INIT_DUP;
struct string_list committers = STRING_LIST_INIT_DUP;
int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;
struct strbuf sb = STRBUF_INIT;
const struct object_id *oid = &origin_data->oid;
int limit = opts->shortlog_len;
branch = deref_tag(the_repository, parse_object(the_repository, oid),
oid_to_hex(oid),
the_hash_algo->hexsz);
if (!branch || branch->type != OBJ_COMMIT)
return;
setup_revisions(0, NULL, rev, NULL);
add_pending_object(rev, branch, name);
add_pending_object(rev, &head->object, "^HEAD");
head->object.flags |= UNINTERESTING;
if (prepare_revision_walk(rev))
die("revision walk setup failed");
while ((commit = get_revision(rev)) != NULL) {
struct pretty_print_context ctx = {0};
if (commit->parents && commit->parents->next) {
/* do not list a merge but count committer */
if (opts->credit_people)
record_person('c', &committers, commit);
continue;
}
if (!count && opts->credit_people)
/* the 'tip' committer */
record_person('c', &committers, commit);
if (opts->credit_people)
record_person('a', &authors, commit);
count++;
if (subjects.nr > limit)
continue;
format_commit_message(commit, "%s", &sb, &ctx);
strbuf_ltrim(&sb);
if (!sb.len)
string_list_append(&subjects,
oid_to_hex(&commit->object.oid));
else
string_list_append_nodup(&subjects,
strbuf_detach(&sb, NULL));
}
if (opts->credit_people)
add_people_info(out, &authors, &committers);
if (count > limit)
strbuf_addf(out, "\n* %s: (%d commits)\n", name, count);
else
strbuf_addf(out, "\n* %s:\n", name);
if (origin_data->is_local_branch && use_branch_desc)
add_branch_desc(out, name);
for (i = 0; i < subjects.nr; i++)
if (i >= limit)
strbuf_addstr(out, " ...\n");
else
strbuf_addf(out, " %s\n", subjects.items[i].string);
clear_commit_marks((struct commit *)branch, flags);
clear_commit_marks(head, flags);
free_commit_list(rev->commits);
rev->commits = NULL;
rev->pending.nr = 0;
string_list_clear(&authors, 0);
string_list_clear(&committers, 0);
string_list_clear(&subjects, 0);
}
/*
* See if dest_branch matches with any glob pattern on the
* suppress_dest_patterns list.
*
* We may want to also allow negative matches e.g. ":!glob" like we do
* for pathspec, but for now, let's keep it simple and stupid.
*/
static int dest_suppressed(const char *dest_branch)
{
struct string_list_item *item;
for_each_string_list_item(item, &suppress_dest_patterns) {
if (!wildmatch(item->string, dest_branch, WM_PATHNAME))
return 1;
}
return 0;
}
static void fmt_merge_msg_title(struct strbuf *out,
const char *current_branch)
{
int i = 0;
char *sep = "";
strbuf_addstr(out, "Merge ");
for (i = 0; i < srcs.nr; i++) {
struct src_data *src_data = srcs.items[i].util;
const char *subsep = "";
strbuf_addstr(out, sep);
sep = "; ";
if (src_data->head_status == 1) {
strbuf_addstr(out, srcs.items[i].string);
continue;
}
if (src_data->head_status == 3) {
subsep = ", ";
strbuf_addstr(out, "HEAD");
}
if (src_data->branch.nr) {
strbuf_addstr(out, subsep);
subsep = ", ";
print_joined("branch ", "branches ", &src_data->branch,
out);
}
if (src_data->r_branch.nr) {
strbuf_addstr(out, subsep);
subsep = ", ";
print_joined("remote-tracking branch ", "remote-tracking branches ",
&src_data->r_branch, out);
}
if (src_data->tag.nr) {
strbuf_addstr(out, subsep);
subsep = ", ";
print_joined("tag ", "tags ", &src_data->tag, out);
}
if (src_data->generic.nr) {
strbuf_addstr(out, subsep);
print_joined("commit ", "commits ", &src_data->generic,
out);
}
if (strcmp(".", srcs.items[i].string))
strbuf_addf(out, " of %s", srcs.items[i].string);
}
if (!dest_suppressed(current_branch))
strbuf_addf(out, " into %s", current_branch);
strbuf_addch(out, '\n');
}
static void fmt_tag_signature(struct strbuf *tagbuf,
struct strbuf *sig,
const char *buf,
unsigned long len)
{
const char *tag_body = strstr(buf, "\n\n");
if (tag_body) {
tag_body += 2;
strbuf_add(tagbuf, tag_body, buf + len - tag_body);
}
strbuf_complete_line(tagbuf);
if (sig->len) {
strbuf_addch(tagbuf, '\n');
strbuf_add_commented_lines(tagbuf, sig->buf, sig->len);
}
}
static void fmt_merge_msg_sigs(struct strbuf *out)
{
int i, tag_number = 0, first_tag = 0;
struct strbuf tagbuf = STRBUF_INIT;
for (i = 0; i < origins.nr; i++) {
struct object_id *oid = origins.items[i].util;
enum object_type type;
unsigned long size;
char *buf = read_object_file(oid, &type, &size);
char *origbuf = buf;
unsigned long len = size;
struct signature_check sigc = { NULL };
struct strbuf payload = STRBUF_INIT, sig = STRBUF_INIT;
if (!buf || type != OBJ_TAG)
goto next;
if (!parse_signature(buf, size, &payload, &sig))
;/* merely annotated */
else {
buf = payload.buf;
len = payload.len;
sigc.payload_type = SIGNATURE_PAYLOAD_TAG;
sigc.payload = strbuf_detach(&payload, &sigc.payload_len);
if (check_signature(&sigc, sig.buf, sig.len) &&
!sigc.output)
strbuf_addstr(&sig, "gpg verification failed.\n");
else
strbuf_addstr(&sig, sigc.output);
}
if (!tag_number++) {
fmt_tag_signature(&tagbuf, &sig, buf, len);
first_tag = i;
} else {
if (tag_number == 2) {
struct strbuf tagline = STRBUF_INIT;
strbuf_addch(&tagline, '\n');
strbuf_add_commented_lines(&tagline,
origins.items[first_tag].string,
strlen(origins.items[first_tag].string));
strbuf_insert(&tagbuf, 0, tagline.buf,
tagline.len);
strbuf_release(&tagline);
}
strbuf_addch(&tagbuf, '\n');
strbuf_add_commented_lines(&tagbuf,
origins.items[i].string,
strlen(origins.items[i].string));
fmt_tag_signature(&tagbuf, &sig, buf, len);
}
strbuf_release(&payload);
strbuf_release(&sig);
fmt-merge-msg: prevent use-after-free with signed tags When merging a signed tag, fmt_merge_msg_sigs() is responsible for populating the body of the merge message with the names of the signed tags, their signatures, and the validity of those signatures. In 02769437e1 (ssh signing: use sigc struct to pass payload, 2021-12-09), check_signature() was taught to pass the object payload via the sigc struct instead of passing the payload buffer separately. In effect, 02769437e1 causes buf, and sigc.payload to point at the same region in memory. This causes a problem for fmt_tag_signature(), which wants to read from this location, since it is freed beforehand by signature_check_clear() (which frees it via sigc's `payload` member). That makes the subsequent use in fmt_tag_signature() a use-after-free. As a result, merge messages did not contain the body of any signed tags. Luckily, they tend not to contain garbage, either, since the result of strstr()-ing the object buffer in fmt_tag_signature() is guarded: const char *tag_body = strstr(buf, "\n\n"); if (tag_body) { tag_body += 2; strbuf_add(tagbuf, tag_body, buf + len - tag_body); } Unfortunately, the tests in t6200 did not catch this at the time because they do not search for the body of signed tags in fmt-merge-msg's output. Resolve this by waiting to call signature_check_clear() until after its contents can be safely discarded. Harden ourselves against any future regressions in this area by making sure we can find signed tag messages in the output of fmt-merge-msg, too. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-01-10 21:19:06 +00:00
signature_check_clear(&sigc);
next:
free(origbuf);
}
if (tagbuf.len) {
strbuf_addch(out, '\n');
strbuf_addbuf(out, &tagbuf);
}
strbuf_release(&tagbuf);
}
static void find_merge_parents(struct merge_parents *result,
struct strbuf *in, struct object_id *head)
{
struct commit_list *parents;
struct commit *head_commit;
int pos = 0, i, j;
parents = NULL;
while (pos < in->len) {
int len;
char *p = in->buf + pos;
char *newline = strchr(p, '\n');
const char *q;
struct object_id oid;
struct commit *parent;
struct object *obj;
len = newline ? newline - p : strlen(p);
pos += len + !!newline;
if (parse_oid_hex(p, &oid, &q) ||
q[0] != '\t' ||
q[1] != '\t')
continue; /* skip not-for-merge */
/*
* Do not use get_merge_parent() here; we do not have
* "name" here and we do not want to contaminate its
* util field yet.
*/
obj = parse_object(the_repository, &oid);
parent = (struct commit *)peel_to_type(NULL, 0, obj, OBJ_COMMIT);
if (!parent)
continue;
commit_list_insert(parent, &parents);
add_merge_parent(result, &obj->oid, &parent->object.oid);
}
head_commit = lookup_commit(the_repository, head);
if (head_commit)
commit_list_insert(head_commit, &parents);
reduce_heads_replace(&parents);
while (parents) {
struct commit *cmit = pop_commit(&parents);
for (i = 0; i < result->nr; i++)
if (oideq(&result->item[i].commit, &cmit->object.oid))
result->item[i].used = 1;
}
for (i = j = 0; i < result->nr; i++) {
if (result->item[i].used) {
if (i != j)
result->item[j] = result->item[i];
j++;
}
}
result->nr = j;
}
int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
struct fmt_merge_msg_opts *opts)
{
int i = 0, pos = 0;
struct object_id head_oid;
const char *current_branch;
void *current_branch_to_free;
struct merge_parents merge_parents;
if (!suppress_dest_pattern_seen) {
string_list_append(&suppress_dest_patterns, "main");
string_list_append(&suppress_dest_patterns, "master");
}
memset(&merge_parents, 0, sizeof(merge_parents));
merge: allow to pretend a merge is made into a different branch When a series of patches for a topic-B depends on having topic-A, the workflow to prepare the topic-B branch would look like this: $ git checkout -b topic-B main $ git merge --no-ff --no-edit topic-A $ git am <mbox-for-topic-B When topic-A gets updated, recreating the first merge and rebasing the rest of the topic-B, all on detached HEAD, is a useful technique. After updating topic-A with its new round of patches: $ git checkout topic-B $ prev=$(git rev-parse 'HEAD^{/^Merge branch .topic-A. into}') $ git checkout --detach $prev^1 $ git merge --no-ff --no-edit topic-A $ git rebase --onto HEAD $prev @{-1}^0 $ git checkout -B @{-1} This will (0) check out the current topic-B. (1) find the previous merge of topic-A into topic-B. (2) detach the HEAD to the parent of the previous merge. (3) merge the updated topic-A to it. (4) reapply the patches to rebuild the rest of topic-B. (5) update topic-B with the result. without contaminating the reflog of topic-B too much. topic-B@{1} is the "logically previous" state before topic-A got updated, for example. At (4), comparison (e.g. range-diff) between HEAD and @{-1} is a meaningful way to sanity check the result, and the same can be done at (5) by comparing topic-B and topic-B@{1}. But there is one glitch. The merge into the detached HEAD done in the step (3) above gives us "Merge branch 'topic-A' into HEAD", and does not say "into topic-B". Teach the "--into-name=<branch>" option to "git merge" and its underlying "git fmt-merge-message", to pretend as if we were merging into <branch>, no matter what branch we are actually merging into, when they prepare the merge message. The pretend name honors the usual "into <target>" suppression mechanism, which can be seen in the tests added here. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-12-20 22:53:43 +00:00
/* learn the commit that we merge into and the current branch name */
current_branch = current_branch_to_free =
resolve_refdup("HEAD", RESOLVE_REF_READING, &head_oid, NULL);
if (!current_branch)
die("No current branch");
merge: allow to pretend a merge is made into a different branch When a series of patches for a topic-B depends on having topic-A, the workflow to prepare the topic-B branch would look like this: $ git checkout -b topic-B main $ git merge --no-ff --no-edit topic-A $ git am <mbox-for-topic-B When topic-A gets updated, recreating the first merge and rebasing the rest of the topic-B, all on detached HEAD, is a useful technique. After updating topic-A with its new round of patches: $ git checkout topic-B $ prev=$(git rev-parse 'HEAD^{/^Merge branch .topic-A. into}') $ git checkout --detach $prev^1 $ git merge --no-ff --no-edit topic-A $ git rebase --onto HEAD $prev @{-1}^0 $ git checkout -B @{-1} This will (0) check out the current topic-B. (1) find the previous merge of topic-A into topic-B. (2) detach the HEAD to the parent of the previous merge. (3) merge the updated topic-A to it. (4) reapply the patches to rebuild the rest of topic-B. (5) update topic-B with the result. without contaminating the reflog of topic-B too much. topic-B@{1} is the "logically previous" state before topic-A got updated, for example. At (4), comparison (e.g. range-diff) between HEAD and @{-1} is a meaningful way to sanity check the result, and the same can be done at (5) by comparing topic-B and topic-B@{1}. But there is one glitch. The merge into the detached HEAD done in the step (3) above gives us "Merge branch 'topic-A' into HEAD", and does not say "into topic-B". Teach the "--into-name=<branch>" option to "git merge" and its underlying "git fmt-merge-message", to pretend as if we were merging into <branch>, no matter what branch we are actually merging into, when they prepare the merge message. The pretend name honors the usual "into <target>" suppression mechanism, which can be seen in the tests added here. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-12-20 22:53:43 +00:00
if (opts->into_name)
current_branch = opts->into_name;
else if (starts_with(current_branch, "refs/heads/"))
current_branch += 11;
find_merge_parents(&merge_parents, in, &head_oid);
/* get a line */
while (pos < in->len) {
int len;
char *newline, *p = in->buf + pos;
newline = strchr(p, '\n');
len = newline ? newline - p : strlen(p);
pos += len + !!newline;
i++;
p[len] = 0;
if (handle_line(p, &merge_parents))
die("error in line %d: %.*s", i, len, p);
}
if (opts->add_title && srcs.nr)
fmt_merge_msg_title(out, current_branch);
if (origins.nr)
fmt_merge_msg_sigs(out);
if (opts->shortlog_len) {
struct commit *head;
struct rev_info rev;
head = lookup_commit_or_die(&head_oid, "HEAD");
repo_init_revisions(the_repository, &rev, NULL);
rev.commit_format = CMIT_FMT_ONELINE;
diff_merges_suppress(&rev);
rev.limited = 1;
strbuf_complete_line(out);
for (i = 0; i < origins.nr; i++)
shortlog(origins.items[i].string,
origins.items[i].util,
head, &rev, opts, out);
release_revisions(&rev);
}
strbuf_complete_line(out);
free(current_branch_to_free);
free(merge_parents.item);
return 0;
}