#include "git2/common.h"

#include "git2/object.h"

#include "git2/repository.h"

#include "git2/signature.h"

#include "git2/sys/commit.h"

#include "common.h"

#include "odb.h"

#include "commit.h"

#include "signature.h"

#include "message.h"

#include "refs.h"

#include "object.h"

#include "oidarray.h"

void git_commit__free(void *_commit)

{

git_commit *commit = _commit;

git_array_clear(commit->parent_ids);

git_signature_free(commit->author);

git_signature_free(commit->committer);

git__free(commit->raw_header);

git__free(commit->raw_message);

git__free(commit->message_encoding);

git__free(commit->summary);

git__free(commit->body);

git__free(commit);

}

static int git_commit__create_buffer_internal(

git_array_oid_t *parents)

{

size_t i = 0;

const git_oid *parent;

assert(out && tree);

git_oid__writebuf(out, "tree ", tree);

for (i = 0; i < git_array_size(*parents); i++) {

parent = git_array_get(*parents, i);

git_oid__writebuf(out, "parent ", parent);

}

git_signature__writebuf(out, "author ", author);

git_signature__writebuf(out, "committer ", committer);

if (message_encoding != NULL)

git_buf_printf(out, "encoding %s\n", message_encoding);

git_buf_putc(out, '\n');

if (git_buf_puts(out, message) < 0)

goto on_error;

return 0;

on_error:

git_buf_free(out);

return -1;

}

static int validate_tree_and_parents(git_array_oid_t *parents, git_repository *repo, const git_oid *tree,

git_commit_parent_callback parent_cb, void *parent_payload,

const git_oid *current_id, bool validate)

{

size_t i;

int error;

git_oid *parent_cpy;

const git_oid *parent;

if (validate && !git_object__is_valid(repo, tree, GIT_OBJ_TREE))

return -1;

i = 0;

while ((parent = parent_cb(i, parent_payload)) != NULL) {

if (validate && !git_object__is_valid(repo, parent, GIT_OBJ_COMMIT)) {

error = -1;

goto on_error;

}

parent_cpy = git_array_alloc(*parents);

GITERR_CHECK_ALLOC(parent_cpy);

git_oid_cpy(parent_cpy, parent);

i++;

}

if (current_id && (parents->size == 0 || git_oid_cmp(current_id, git_array_get(*parents, 0)))) {

giterr_set(GITERR_OBJECT, "failed to create commit: current tip is not the first parent");

error = GIT_EMODIFIED;

goto on_error;

}

return 0;

on_error:

git_array_clear(*parents);

return error;

}

static int git_commit__create_internal(

bool validate)

{

int error;

git_odb *odb;

git_reference *ref = NULL;

git_buf buf = GIT_BUF_INIT;

const git_oid *current_id = NULL;

git_array_oid_t parents = GIT_ARRAY_INIT;

if (update_ref) {

error = git_reference_lookup_resolved(&ref, repo, update_ref, 10);

if (error < 0 && error != GIT_ENOTFOUND)

return error;

}

giterr_clear();

if (ref)

current_id = git_reference_target(ref);

if ((error = validate_tree_and_parents(&parents, repo, tree, parent_cb, parent_payload, current_id, validate)) < 0)

goto cleanup;

error = git_commit__create_buffer_internal(&buf, author, committer,

message_encoding, message, tree,

&parents);

if (error < 0)

goto cleanup;

if (git_repository_odb__weakptr(&odb, repo) < 0)

goto cleanup;

if (git_odb_write(id, odb, buf.ptr, buf.size, GIT_OBJ_COMMIT) < 0)

goto cleanup;

if (update_ref != NULL) {

error = git_reference__update_for_commit(

repo, ref, update_ref, id, "commit");

goto cleanup;

}

cleanup:

git_array_clear(parents);

git_reference_free(ref);

git_buf_free(&buf);

return error;

}

int git_commit_create_from_callback(

void *parent_payload)

{

return git_commit__create_internal(

id, repo, update_ref, author, committer, message_encoding, message,

tree, parent_cb, parent_payload, true);

}

typedef struct {

size_t total;

va_list args;

} commit_parent_varargs;

static const git_oid *commit_parent_from_varargs(size_t curr, void *payload)

{

commit_parent_varargs *data = payload;

const git_commit *commit;

if (curr >= data->total)

return NULL;

commit = va_arg(data->args, const git_commit *);

return commit ? git_commit_id(commit) : NULL;

}

int git_commit_create_v(

...)

{

int error = 0;

commit_parent_varargs data;

assert(tree && git_tree_owner(tree) == repo);

data.total = parent_count;

va_start(data.args, parent_count);

error = git_commit__create_internal(

id, repo, update_ref, author, committer,

message_encoding, message, git_tree_id(tree),

commit_parent_from_varargs, &data, false);

va_end(data.args);

return error;

}

typedef struct {

size_t total;

const git_oid **parents;

} commit_parent_oids;

static const git_oid *commit_parent_from_ids(size_t curr, void *payload)

{

commit_parent_oids *data = payload;

return (curr < data->total) ? data->parents[curr] : NULL;

}

int git_commit_create_from_ids(

const git_oid *parents[])

{

commit_parent_oids data = { parent_count, parents };

return git_commit__create_internal(

id, repo, update_ref, author, committer,

message_encoding, message, tree,

commit_parent_from_ids, &data, true);

}

typedef struct {

size_t total;

const git_commit **parents;

git_repository *repo;

} commit_parent_data;

static const git_oid *commit_parent_from_array(size_t curr, void *payload)

{

commit_parent_data *data = payload;

const git_commit *commit;

if (curr >= data->total)

return NULL;

commit = data->parents[curr];

if (git_commit_owner(commit) != data->repo)

return NULL;

return git_commit_id(commit);

}

int git_commit_create(

const git_commit *parents[])

{

commit_parent_data data = { parent_count, parents, repo };

assert(tree && git_tree_owner(tree) == repo);

return git_commit__create_internal(

id, repo, update_ref, author, committer,

message_encoding, message, git_tree_id(tree),

commit_parent_from_array, &data, false);

}

static const git_oid *commit_parent_for_amend(size_t curr, void *payload)

{

const git_commit *commit_to_amend = payload;

if (curr >= git_array_size(commit_to_amend->parent_ids))

return NULL;

return git_array_get(commit_to_amend->parent_ids, curr);

}

int git_commit_amend(

const git_tree *tree)

{

git_repository *repo;

git_oid tree_id;

git_reference *ref;

int error;

assert(id && commit_to_amend);

repo = git_commit_owner(commit_to_amend);

if (!author)

author = git_commit_author(commit_to_amend);

if (!committer)

committer = git_commit_committer(commit_to_amend);

if (!message_encoding)

message_encoding = git_commit_message_encoding(commit_to_amend);

if (!message)

message = git_commit_message(commit_to_amend);

if (!tree) {

git_tree *old_tree;

GITERR_CHECK_ERROR( git_commit_tree(&old_tree, commit_to_amend) );

git_oid_cpy(&tree_id, git_tree_id(old_tree));

git_tree_free(old_tree);

} else {

assert(git_tree_owner(tree) == repo);

git_oid_cpy(&tree_id, git_tree_id(tree));

}

if (update_ref) {

if ((error = git_reference_lookup_resolved(&ref, repo, update_ref, 5)) < 0)

return error;

if (git_oid_cmp(git_commit_id(commit_to_amend), git_reference_target(ref))) {

git_reference_free(ref);

giterr_set(GITERR_REFERENCE, "commit to amend is not the tip of the given branch");

return -1;

}

}

error = git_commit__create_internal(

id, repo, NULL, author, committer, message_encoding, message,

&tree_id, commit_parent_for_amend, (void *)commit_to_amend, false);

if (!error && update_ref) {

error = git_reference__update_for_commit(

repo, ref, NULL, id, "commit");

git_reference_free(ref);

}

return error;

}

int git_commit__parse(void *_commit, git_odb_object *odb_obj)

{

git_commit *commit = _commit;

const char *buffer_start = git_odb_object_data(odb_obj), *buffer;

const char *buffer_end = buffer_start + git_odb_object_size(odb_obj);

git_oid parent_id;

size_t header_len;

git_signature dummy_sig;

buffer = buffer_start;

/* Allocate for one, which will allow not to realloc 90% of the time */

git_array_init_to_size(commit->parent_ids, 1);

GITERR_CHECK_ARRAY(commit->parent_ids);

/* The tree is always the first field */

if (git_oid__parse(&commit->tree_id, &buffer, buffer_end, "tree ") < 0)

goto bad_buffer;

/*

while (git_oid__parse(&parent_id, &buffer, buffer_end, "parent ") == 0) {

git_oid *new_id = git_array_alloc(commit->parent_ids);

GITERR_CHECK_ALLOC(new_id);

git_oid_cpy(new_id, &parent_id);

}

commit->author = git__malloc(sizeof(git_signature));

GITERR_CHECK_ALLOC(commit->author);

if (git_signature__parse(commit->author, &buffer, buffer_end, "author ", '\n') < 0)

return -1;

/* Some tools create multiple author fields, ignore the extra ones */

while ((size_t)(buffer_end - buffer) >= strlen("author ") && !git__prefixcmp(buffer, "author ")) {

if (git_signature__parse(&dummy_sig, &buffer, buffer_end, "author ", '\n') < 0)

return -1;

git__free(dummy_sig.name);

git__free(dummy_sig.email);

}

/* Always parse the committer; we need the commit time */

commit->committer = git__malloc(sizeof(git_signature));

GITERR_CHECK_ALLOC(commit->committer);

if (git_signature__parse(commit->committer, &buffer, buffer_end, "committer ", '\n') < 0)

return -1;

/* Parse add'l header entries */

while (buffer < buffer_end) {

const char *eoln = buffer;

if (buffer[-1] == '\n' && buffer[0] == '\n')

break;

while (eoln < buffer_end && *eoln != '\n')

++eoln;

if (git__prefixcmp(buffer, "encoding ") == 0) {

buffer += strlen("encoding ");

commit->message_encoding = git__strndup(buffer, eoln - buffer);

GITERR_CHECK_ALLOC(commit->message_encoding);

}

if (eoln < buffer_end && *eoln == '\n')

++eoln;

buffer = eoln;

}

header_len = buffer - buffer_start;

commit->raw_header = git__strndup(buffer_start, header_len);

GITERR_CHECK_ALLOC(commit->raw_header);

/* point "buffer" to data after header, +1 for the final LF */

buffer = buffer_start + header_len + 1;

/* extract commit message */

if (buffer <= buffer_end) {

commit->raw_message = git__strndup(buffer, buffer_end - buffer);

GITERR_CHECK_ALLOC(commit->raw_message);

}

return 0;

bad_buffer:

giterr_set(GITERR_OBJECT, "Failed to parse bad commit object");

return -1;

}

#define GIT_COMMIT_GETTER(_rvalue, _name, _return) \

_rvalue git_commit_##_name(const git_commit *commit) \

{\

assert(commit); \

return _return; \

}

GIT_COMMIT_GETTER(const git_signature *, author, commit->author)

GIT_COMMIT_GETTER(const git_signature *, committer, commit->committer)

GIT_COMMIT_GETTER(unsigned int, parentcount, (unsigned int)git_array_size(commit->parent_ids))

GIT_COMMIT_GETTER(const git_oid *, tree_id, &commit->tree_id)

const char *git_commit_message(const git_commit *commit)

{

const char *message;

assert(commit);

message = commit->raw_message;

/* trim leading newlines from raw message */

while (*message && *message == '\n')

++message;

return message;

}

const char *git_commit_summary(git_commit *commit)

{

git_buf summary = GIT_BUF_INIT;

const char *msg, *space;

bool space_contains_newline = false;

assert(commit);

if (!commit->summary) {

for (msg = git_commit_message(commit), space = NULL; *msg; ++msg) {

char next_character = msg[0];

/* stop processing at the end of the first paragraph */

if (next_character == '\n' && (!msg[1] || msg[1] == '\n'))

break;

/* record the beginning of contiguous whitespace runs */

else if (git__isspace(next_character)) {

if(space == NULL) {

space = msg;

space_contains_newline = false;

}

space_contains_newline |= next_character == '\n';

}

/* the next character is non-space */

else {

/* process any recorded whitespace */

if (space) {

if(space_contains_newline)

git_buf_putc(&summary, ' '); /* if the space contains a newline, collapse to ' ' */

else

git_buf_put(&summary, space, (msg - space)); /* otherwise copy it */

space = NULL;

}

/* copy the next character */

git_buf_putc(&summary, next_character);

}

}

commit->summary = git_buf_detach(&summary);

if (!commit->summary)

commit->summary = git__strdup("");

}

return commit->summary;

}

const char *git_commit_body(git_commit *commit)

{

const char *msg, *end;

assert(commit);

if (!commit->body) {

/* search for end of summary */

for (msg = git_commit_message(commit); *msg; ++msg)

if (msg[0] == '\n' && (!msg[1] || msg[1] == '\n'))

break;

/* trim leading and trailing whitespace */

for (; *msg; ++msg)

if (!git__isspace(*msg))

break;

for (end = msg + strlen(msg) - 1; msg <= end; --end)

if (!git__isspace(*end))

break;

if (*msg)

commit->body = git__strndup(msg, end - msg + 1);

}

return commit->body;

}

int git_commit_tree(git_tree **tree_out, const git_commit *commit)

{

assert(commit);

return git_tree_lookup(tree_out, commit->object.repo, &commit->tree_id);

}

const git_oid *git_commit_parent_id(

const git_commit *commit, unsigned int n)

{

assert(commit);

return git_array_get(commit->parent_ids, n);

}

int git_commit_parent(

git_commit **parent, const git_commit *commit, unsigned int n)

{

const git_oid *parent_id;

assert(commit);

parent_id = git_commit_parent_id(commit, n);

if (parent_id == NULL) {

giterr_set(GITERR_INVALID, "Parent %u does not exist", n);

return GIT_ENOTFOUND;

}

return git_commit_lookup(parent, commit->object.repo, parent_id);

}

int git_commit_nth_gen_ancestor(

git_commit **ancestor,

const git_commit *commit,

unsigned int n)

{

git_commit *current, *parent = NULL;

int error;

assert(ancestor && commit);

if (git_commit_dup(&current, (git_commit *)commit) < 0)

return -1;

if (n == 0) {

*ancestor = current;

return 0;

}

while (n--) {

error = git_commit_parent(&parent, current, 0);

git_commit_free(current);

if (error < 0)

return error;

current = parent;

}

*ancestor = parent;

return 0;

}

int git_commit_header_field(git_buf *out, const git_commit *commit, const char *field)

{

const char *eol, *buf = commit->raw_header;

git_buf_sanitize(out);

while ((eol = strchr(buf, '\n'))) {

/* We can skip continuations here */

if (buf[0] == ' ') {

buf = eol + 1;

continue;

}

/* Skip until we find the field we're after */

if (git__prefixcmp(buf, field)) {

buf = eol + 1;

continue;

}

buf += strlen(field);

/* Check that we're not matching a prefix but the field itself */

if (buf[0] != ' ') {

buf = eol + 1;

continue;

}

buf++; /* skip the SP */

git_buf_put(out, buf, eol - buf);

if (git_buf_oom(out))

goto oom;

/* If the next line starts with SP, it's multi-line, we must continue */

while (eol[1] == ' ') {

git_buf_putc(out, '\n');

buf = eol + 2;

eol = strchr(buf, '\n');

if (!eol)

goto malformed;

git_buf_put(out, buf, eol - buf);

}

if (git_buf_oom(out))

goto oom;

return 0;

}

giterr_set(GITERR_OBJECT, "no such field '%s'", field);

return GIT_ENOTFOUND;

malformed:

giterr_set(GITERR_OBJECT, "malformed header");

return -1;

oom:

giterr_set_oom();

return -1;

}

int git_commit_extract_signature(git_buf *signature, git_buf *signed_data, git_repository *repo, git_oid *commit_id, const char *field)

{

git_odb_object *obj;

git_odb *odb;

const char *buf;

const char *h, *eol;

int error;

git_buf_sanitize(signature);

git_buf_sanitize(signed_data);

if (!field)

field = "gpgsig";

if ((error = git_repository_odb__weakptr(&odb, repo)) < 0)

return error;

if ((error = git_odb_read(&obj, odb, commit_id)) < 0)

return error;

if (obj->cached.type != GIT_OBJ_COMMIT) {

giterr_set(GITERR_INVALID, "the requested type does not match the type in ODB");

error = GIT_ENOTFOUND;

goto cleanup;

}

buf = git_odb_object_data(obj);

while ((h = strchr(buf, '\n')) && h[1] != '\0') {

h++;

if (git__prefixcmp(buf, field)) {

if (git_buf_put(signed_data, buf, h - buf) < 0)

return -1;

buf = h;

continue;

}

h = buf;

h += strlen(field);

eol = strchr(h, '\n');

if (h[0] != ' ') {

buf = h;

continue;

}

if (!eol)

goto malformed;

h++; /* skip the SP */

git_buf_put(signature, h, eol - h);

if (git_buf_oom(signature))

goto oom;

/* If the next line starts with SP, it's multi-line, we must continue */

while (eol[1] == ' ') {

git_buf_putc(signature, '\n');

h = eol + 2;

eol = strchr(h, '\n');

if (!eol)

goto malformed;

git_buf_put(signature, h, eol - h);

}

if (git_buf_oom(signature))

goto oom;

git_odb_object_free(obj);

return git_buf_puts(signed_data, eol+1);

}

giterr_set(GITERR_OBJECT, "this commit is not signed");

error = GIT_ENOTFOUND;

goto cleanup;

malformed:

giterr_set(GITERR_OBJECT, "malformed header");

error = -1;

goto cleanup;

oom:

giterr_set_oom();

error = -1;

goto cleanup;

cleanup:

git_odb_object_free(obj);

git_buf_clear(signature);

git_buf_clear(signed_data);

return error;

}

int git_commit_create_buffer(git_buf *out,

const git_commit *parents[])

{

int error;

commit_parent_data data = { parent_count, parents, repo };

git_array_oid_t parents_arr = GIT_ARRAY_INIT;

const git_oid *tree_id;

assert(tree && git_tree_owner(tree) == repo);

tree_id = git_tree_id(tree);

if ((error = validate_tree_and_parents(&parents_arr, repo, tree_id, commit_parent_from_array, &data, NULL, true)) < 0)

return error;

error = git_commit__create_buffer_internal(

out, author, committer,

message_encoding, message, tree_id,

&parents_arr);

git_array_clear(parents_arr);

return error;

}

static void format_header_field(git_buf *out, const char *field, const char *content)

{

const char *lf;

assert(out && field && content);

git_buf_puts(out, field);

git_buf_putc(out, ' ');

while ((lf = strchr(content, '\n')) != NULL) {

git_buf_put(out, content, lf - content);

git_buf_puts(out, "\n ");

content = lf + 1;

}

git_buf_puts(out, content);

git_buf_putc(out, '\n');

}

int git_commit_create_with_signature(

const char *signature_field)

{

git_odb *odb;

int error = 0;

const char *field;

const char *header_end;

git_buf commit = GIT_BUF_INIT;

/* We start by identifying the end of the commit header */

header_end = strstr(commit_content, "\n\n");

if (!header_end) {

giterr_set(GITERR_INVALID, "malformed commit contents");

return -1;

}

field = signature_field ? signature_field : "gpgsig";

/* The header ends after the first LF */

header_end++;

git_buf_put(&commit, commit_content, header_end - commit_content);

format_header_field(&commit, field, signature);

git_buf_puts(&commit, header_end);

if (git_buf_oom(&commit))

return -1;

if ((error = git_repository_odb__weakptr(&odb, repo)) < 0)

goto cleanup;

if ((error = git_odb_write(out, odb, commit.ptr, commit.size, GIT_OBJ_COMMIT)) < 0)

goto cleanup;

cleanup:

git_buf_free(&commit);

return error;

}