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429 lines (345 loc) · 10.5 KB
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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "git2/blob.h"
#include "git2/submodule.h"
#include "diff.h"
#include "diff_file.h"
#include "odb.h"
#include "fileops.h"
#include "filter.h"
#define DIFF_MAX_FILESIZE 0x20000000
static bool diff_file_content_binary_by_size(git_diff_file_content *fc)
{
/* if we have diff opts, check max_size vs file size */
if ((fc->file->flags & DIFF_FLAGS_KNOWN_BINARY) == 0 &&
fc->opts_max_size > 0 &&
fc->file->size > fc->opts_max_size)
fc->file->flags |= GIT_DIFF_FLAG_BINARY;
return ((fc->file->flags & GIT_DIFF_FLAG_BINARY) != 0);
}
static void diff_file_content_binary_by_content(git_diff_file_content *fc)
{
if ((fc->file->flags & DIFF_FLAGS_KNOWN_BINARY) != 0)
return;
switch (git_diff_driver_content_is_binary(
fc->driver, fc->map.data, fc->map.len)) {
case 0: fc->file->flags |= GIT_DIFF_FLAG_NOT_BINARY; break;
case 1: fc->file->flags |= GIT_DIFF_FLAG_BINARY; break;
default: break;
}
}
static int diff_file_content_init_common(
git_diff_file_content *fc, const git_diff_options *opts)
{
fc->opts_flags = opts ? opts->flags : GIT_DIFF_NORMAL;
if (opts && opts->max_size >= 0)
fc->opts_max_size = opts->max_size ?
opts->max_size : DIFF_MAX_FILESIZE;
if (fc->src == GIT_ITERATOR_TYPE_EMPTY)
fc->src = GIT_ITERATOR_TYPE_TREE;
if (!fc->driver &&
git_diff_driver_lookup(&fc->driver, fc->repo, fc->file->path) < 0)
return -1;
/* give driver a chance to modify options */
git_diff_driver_update_options(&fc->opts_flags, fc->driver);
/* make sure file is conceivable mmap-able */
if ((git_off_t)((size_t)fc->file->size) != fc->file->size)
fc->file->flags |= GIT_DIFF_FLAG_BINARY;
/* check if user is forcing text diff the file */
else if (fc->opts_flags & GIT_DIFF_FORCE_TEXT) {
fc->file->flags &= ~GIT_DIFF_FLAG_BINARY;
fc->file->flags |= GIT_DIFF_FLAG_NOT_BINARY;
}
/* check if user is forcing binary diff the file */
else if (fc->opts_flags & GIT_DIFF_FORCE_BINARY) {
fc->file->flags &= ~GIT_DIFF_FLAG_NOT_BINARY;
fc->file->flags |= GIT_DIFF_FLAG_BINARY;
}
diff_file_content_binary_by_size(fc);
if ((fc->flags & GIT_DIFF_FLAG__NO_DATA) != 0) {
fc->flags |= GIT_DIFF_FLAG__LOADED;
fc->map.len = 0;
fc->map.data = "";
}
if ((fc->flags & GIT_DIFF_FLAG__LOADED) != 0)
diff_file_content_binary_by_content(fc);
return 0;
}
int git_diff_file_content__init_from_diff(
git_diff_file_content *fc,
git_diff *diff,
size_t delta_index,
bool use_old)
{
git_diff_delta *delta = git_vector_get(&diff->deltas, delta_index);
bool has_data = true;
memset(fc, 0, sizeof(*fc));
fc->repo = diff->repo;
fc->file = use_old ? &delta->old_file : &delta->new_file;
fc->src = use_old ? diff->old_src : diff->new_src;
if (git_diff_driver_lookup(&fc->driver, fc->repo, fc->file->path) < 0)
return -1;
switch (delta->status) {
case GIT_DELTA_ADDED:
has_data = !use_old; break;
case GIT_DELTA_DELETED:
has_data = use_old; break;
case GIT_DELTA_UNTRACKED:
has_data = !use_old &&
(diff->opts.flags & GIT_DIFF_SHOW_UNTRACKED_CONTENT) != 0;
break;
case GIT_DELTA_UNREADABLE:
case GIT_DELTA_MODIFIED:
case GIT_DELTA_COPIED:
case GIT_DELTA_RENAMED:
break;
default:
has_data = false;
break;
}
if (!has_data)
fc->flags |= GIT_DIFF_FLAG__NO_DATA;
return diff_file_content_init_common(fc, &diff->opts);
}
int git_diff_file_content__init_from_src(
git_diff_file_content *fc,
git_repository *repo,
const git_diff_options *opts,
const git_diff_file_content_src *src,
git_diff_file *as_file)
{
memset(fc, 0, sizeof(*fc));
fc->repo = repo;
fc->file = as_file;
fc->blob = src->blob;
if (!src->blob && !src->buf) {
fc->flags |= GIT_DIFF_FLAG__NO_DATA;
} else {
fc->flags |= GIT_DIFF_FLAG__LOADED;
fc->file->flags |= GIT_DIFF_FLAG_VALID_ID;
fc->file->mode = GIT_FILEMODE_BLOB;
if (src->blob) {
fc->file->size = git_blob_rawsize(src->blob);
git_oid_cpy(&fc->file->id, git_blob_id(src->blob));
fc->map.len = (size_t)fc->file->size;
fc->map.data = (char *)git_blob_rawcontent(src->blob);
} else {
fc->file->size = src->buflen;
git_odb_hash(&fc->file->id, src->buf, src->buflen, GIT_OBJ_BLOB);
fc->map.len = src->buflen;
fc->map.data = (char *)src->buf;
}
}
return diff_file_content_init_common(fc, opts);
}
static int diff_file_content_commit_to_str(
git_diff_file_content *fc, bool check_status)
{
char oid[GIT_OID_HEXSZ+1];
git_buf content = GIT_BUF_INIT;
const char *status = "";
if (check_status) {
int error = 0;
git_submodule *sm = NULL;
unsigned int sm_status = 0;
const git_oid *sm_head;
if ((error = git_submodule_lookup(&sm, fc->repo, fc->file->path)) < 0) {
/* GIT_EEXISTS means a "submodule" that has not been git added */
if (error == GIT_EEXISTS) {
giterr_clear();
error = 0;
}
return error;
}
if ((error = git_submodule_status(&sm_status, sm)) < 0) {
git_submodule_free(sm);
return error;
}
/* update OID if we didn't have it previously */
if ((fc->file->flags & GIT_DIFF_FLAG_VALID_ID) == 0 &&
((sm_head = git_submodule_wd_id(sm)) != NULL ||
(sm_head = git_submodule_head_id(sm)) != NULL))
{
git_oid_cpy(&fc->file->id, sm_head);
fc->file->flags |= GIT_DIFF_FLAG_VALID_ID;
}
if (GIT_SUBMODULE_STATUS_IS_WD_DIRTY(sm_status))
status = "-dirty";
git_submodule_free(sm);
}
git_oid_tostr(oid, sizeof(oid), &fc->file->id);
if (git_buf_printf(&content, "Subproject commit %s%s\n", oid, status) < 0)
return -1;
fc->map.len = git_buf_len(&content);
fc->map.data = git_buf_detach(&content);
fc->flags |= GIT_DIFF_FLAG__FREE_DATA;
return 0;
}
static int diff_file_content_load_blob(git_diff_file_content *fc)
{
int error = 0;
git_odb_object *odb_obj = NULL;
if (git_oid_iszero(&fc->file->id))
return 0;
if (fc->file->mode == GIT_FILEMODE_COMMIT)
return diff_file_content_commit_to_str(fc, false);
/* if we don't know size, try to peek at object header first */
if (!fc->file->size) {
if ((error = git_diff_file__resolve_zero_size(
fc->file, &odb_obj, fc->repo)) < 0)
return error;
}
if (diff_file_content_binary_by_size(fc))
return 0;
if (odb_obj != NULL) {
error = git_object__from_odb_object(
(git_object **)&fc->blob, fc->repo, odb_obj, GIT_OBJ_BLOB);
git_odb_object_free(odb_obj);
} else {
error = git_blob_lookup(
(git_blob **)&fc->blob, fc->repo, &fc->file->id);
}
if (!error) {
fc->flags |= GIT_DIFF_FLAG__FREE_BLOB;
fc->map.data = (void *)git_blob_rawcontent(fc->blob);
fc->map.len = (size_t)git_blob_rawsize(fc->blob);
}
return error;
}
static int diff_file_content_load_workdir_symlink(
git_diff_file_content *fc, git_buf *path)
{
ssize_t alloc_len, read_len;
/* link path on disk could be UTF-16, so prepare a buffer that is
* big enough to handle some UTF-8 data expansion
*/
alloc_len = (ssize_t)(fc->file->size * 2) + 1;
fc->map.data = git__calloc(alloc_len, sizeof(char));
GITERR_CHECK_ALLOC(fc->map.data);
fc->flags |= GIT_DIFF_FLAG__FREE_DATA;
read_len = p_readlink(git_buf_cstr(path), fc->map.data, alloc_len);
if (read_len < 0) {
giterr_set(GITERR_OS, "Failed to read symlink '%s'", fc->file->path);
return -1;
}
fc->map.len = read_len;
return 0;
}
static int diff_file_content_load_workdir_file(
git_diff_file_content *fc, git_buf *path)
{
int error = 0;
git_filter_list *fl = NULL;
git_file fd = git_futils_open_ro(git_buf_cstr(path));
git_buf raw = GIT_BUF_INIT;
if (fd < 0)
return fd;
if (!fc->file->size &&
!(fc->file->size = git_futils_filesize(fd)))
goto cleanup;
if (diff_file_content_binary_by_size(fc))
goto cleanup;
if ((error = git_filter_list_load(
&fl, fc->repo, NULL, fc->file->path,
GIT_FILTER_TO_ODB, GIT_FILTER_OPT_ALLOW_UNSAFE)) < 0)
goto cleanup;
/* if there are no filters, try to mmap the file */
if (fl == NULL) {
if (!(error = git_futils_mmap_ro(
&fc->map, fd, 0, (size_t)fc->file->size))) {
fc->flags |= GIT_DIFF_FLAG__UNMAP_DATA;
goto cleanup;
}
/* if mmap failed, fall through to try readbuffer below */
giterr_clear();
}
if (!(error = git_futils_readbuffer_fd(&raw, fd, (size_t)fc->file->size))) {
git_buf out = GIT_BUF_INIT;
error = git_filter_list_apply_to_data(&out, fl, &raw);
if (out.ptr != raw.ptr)
git_buf_free(&raw);
if (!error) {
fc->map.len = out.size;
fc->map.data = out.ptr;
fc->flags |= GIT_DIFF_FLAG__FREE_DATA;
}
}
cleanup:
git_filter_list_free(fl);
p_close(fd);
return error;
}
static int diff_file_content_load_workdir(git_diff_file_content *fc)
{
int error = 0;
git_buf path = GIT_BUF_INIT;
if (fc->file->mode == GIT_FILEMODE_COMMIT)
return diff_file_content_commit_to_str(fc, true);
if (fc->file->mode == GIT_FILEMODE_TREE)
return 0;
if (git_buf_joinpath(
&path, git_repository_workdir(fc->repo), fc->file->path) < 0)
return -1;
if (S_ISLNK(fc->file->mode))
error = diff_file_content_load_workdir_symlink(fc, &path);
else
error = diff_file_content_load_workdir_file(fc, &path);
/* once data is loaded, update OID if we didn't have it previously */
if (!error && (fc->file->flags & GIT_DIFF_FLAG_VALID_ID) == 0) {
error = git_odb_hash(
&fc->file->id, fc->map.data, fc->map.len, GIT_OBJ_BLOB);
fc->file->flags |= GIT_DIFF_FLAG_VALID_ID;
}
git_buf_free(&path);
return error;
}
int git_diff_file_content__load(git_diff_file_content *fc)
{
int error = 0;
if ((fc->flags & GIT_DIFF_FLAG__LOADED) != 0)
return 0;
if ((fc->file->flags & GIT_DIFF_FLAG_BINARY) != 0)
return 0;
if (fc->src == GIT_ITERATOR_TYPE_WORKDIR)
error = diff_file_content_load_workdir(fc);
else
error = diff_file_content_load_blob(fc);
if (error)
return error;
fc->flags |= GIT_DIFF_FLAG__LOADED;
diff_file_content_binary_by_content(fc);
return 0;
}
void git_diff_file_content__unload(git_diff_file_content *fc)
{
if ((fc->flags & GIT_DIFF_FLAG__LOADED) == 0)
return;
if (fc->flags & GIT_DIFF_FLAG__FREE_DATA) {
git__free(fc->map.data);
fc->map.data = "";
fc->map.len = 0;
fc->flags &= ~GIT_DIFF_FLAG__FREE_DATA;
}
else if (fc->flags & GIT_DIFF_FLAG__UNMAP_DATA) {
git_futils_mmap_free(&fc->map);
fc->map.data = "";
fc->map.len = 0;
fc->flags &= ~GIT_DIFF_FLAG__UNMAP_DATA;
}
if (fc->flags & GIT_DIFF_FLAG__FREE_BLOB) {
git_blob_free((git_blob *)fc->blob);
fc->blob = NULL;
fc->flags &= ~GIT_DIFF_FLAG__FREE_BLOB;
}
fc->flags &= ~GIT_DIFF_FLAG__LOADED;
}
void git_diff_file_content__clear(git_diff_file_content *fc)
{
git_diff_file_content__unload(fc);
/* for now, nothing else to do */
}
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