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Copy pathblob.c
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362 lines (287 loc) · 8.14 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 "git2/common.h"
#include "git2/object.h"
#include "git2/repository.h"
#include "git2/odb_backend.h"
#include "common.h"
#include "filebuf.h"
#include "blob.h"
#include "filter.h"
#include "buf_text.h"
const void *git_blob_rawcontent(const git_blob *blob)
{
assert(blob);
return git_odb_object_data(blob->odb_object);
}
git_off_t git_blob_rawsize(const git_blob *blob)
{
assert(blob);
return (git_off_t)git_odb_object_size(blob->odb_object);
}
int git_blob__getbuf(git_buf *buffer, git_blob *blob)
{
return git_buf_set(
buffer,
git_odb_object_data(blob->odb_object),
git_odb_object_size(blob->odb_object));
}
void git_blob__free(void *blob)
{
git_odb_object_free(((git_blob *)blob)->odb_object);
git__free(blob);
}
int git_blob__parse(void *blob, git_odb_object *odb_obj)
{
assert(blob);
git_cached_obj_incref((git_cached_obj *)odb_obj);
((git_blob *)blob)->odb_object = odb_obj;
return 0;
}
int git_blob_create_frombuffer(git_oid *oid, git_repository *repo, const void *buffer, size_t len)
{
int error;
git_odb *odb;
git_odb_stream *stream;
if ((error = git_repository_odb__weakptr(&odb, repo)) < 0 ||
(error = git_odb_open_wstream(&stream, odb, len, GIT_OBJ_BLOB)) < 0)
return error;
if ((error = git_odb_stream_write(stream, buffer, len)) == 0)
error = git_odb_stream_finalize_write(oid, stream);
git_odb_stream_free(stream);
return error;
}
static int write_file_stream(
git_oid *oid, git_odb *odb, const char *path, git_off_t file_size)
{
int fd, error;
char buffer[4096];
git_odb_stream *stream = NULL;
ssize_t read_len = -1, written = 0;
if ((error = git_odb_open_wstream(
&stream, odb, (size_t)file_size, GIT_OBJ_BLOB)) < 0)
return error;
if ((fd = git_futils_open_ro(path)) < 0) {
git_odb_stream_free(stream);
return -1;
}
while (!error && (read_len = p_read(fd, buffer, sizeof(buffer))) > 0) {
error = git_odb_stream_write(stream, buffer, read_len);
written += read_len;
}
p_close(fd);
if (written != file_size || read_len < 0) {
giterr_set(GITERR_OS, "Failed to read file into stream");
error = -1;
}
if (!error)
error = git_odb_stream_finalize_write(oid, stream);
git_odb_stream_free(stream);
return error;
}
static int write_file_filtered(
git_oid *oid,
git_off_t *size,
git_odb *odb,
const char *full_path,
git_filter_list *fl)
{
int error;
git_buf tgt = GIT_BUF_INIT;
error = git_filter_list_apply_to_file(&tgt, fl, NULL, full_path);
/* Write the file to disk if it was properly filtered */
if (!error) {
*size = tgt.size;
error = git_odb_write(oid, odb, tgt.ptr, tgt.size, GIT_OBJ_BLOB);
}
git_buf_free(&tgt);
return error;
}
static int write_symlink(
git_oid *oid, git_odb *odb, const char *path, size_t link_size)
{
char *link_data;
ssize_t read_len;
int error;
link_data = git__malloc(link_size);
GITERR_CHECK_ALLOC(link_data);
read_len = p_readlink(path, link_data, link_size);
if (read_len != (ssize_t)link_size) {
giterr_set(GITERR_OS, "Failed to create blob. Can't read symlink '%s'", path);
git__free(link_data);
return -1;
}
error = git_odb_write(oid, odb, (void *)link_data, link_size, GIT_OBJ_BLOB);
git__free(link_data);
return error;
}
int git_blob__create_from_paths(
git_oid *oid,
struct stat *out_st,
git_repository *repo,
const char *content_path,
const char *hint_path,
mode_t hint_mode,
bool try_load_filters)
{
int error;
struct stat st;
git_odb *odb = NULL;
git_off_t size;
mode_t mode;
git_buf path = GIT_BUF_INIT;
assert(hint_path || !try_load_filters);
if (!content_path) {
if (git_repository__ensure_not_bare(repo, "create blob from file") < 0)
return GIT_EBAREREPO;
if (git_buf_joinpath(
&path, git_repository_workdir(repo), hint_path) < 0)
return -1;
content_path = path.ptr;
}
if ((error = git_path_lstat(content_path, &st)) < 0 ||
(error = git_repository_odb(&odb, repo)) < 0)
goto done;
if (out_st)
memcpy(out_st, &st, sizeof(st));
size = st.st_size;
mode = hint_mode ? hint_mode : st.st_mode;
if (S_ISLNK(mode)) {
error = write_symlink(oid, odb, content_path, (size_t)size);
} else {
git_filter_list *fl = NULL;
if (try_load_filters)
/* Load the filters for writing this file to the ODB */
error = git_filter_list_load(
&fl, repo, NULL, hint_path, GIT_FILTER_TO_ODB);
if (error < 0)
/* well, that didn't work */;
else if (fl == NULL)
/* No filters need to be applied to the document: we can stream
* directly from disk */
error = write_file_stream(oid, odb, content_path, size);
else {
/* We need to apply one or more filters */
error = write_file_filtered(oid, &size, odb, content_path, fl);
git_filter_list_free(fl);
}
/*
* TODO: eventually support streaming filtered files, for files
* which are bigger than a given threshold. This is not a priority
* because applying a filter in streaming mode changes the final
* size of the blob, and without knowing its final size, the blob
* cannot be written in stream mode to the ODB.
*
* The plan is to do streaming writes to a tempfile on disk and then
* opening streaming that file to the ODB, using
* `write_file_stream`.
*
* CAREFULLY DESIGNED APIS YO
*/
}
done:
git_odb_free(odb);
git_buf_free(&path);
return error;
}
int git_blob_create_fromworkdir(
git_oid *oid, git_repository *repo, const char *path)
{
return git_blob__create_from_paths(oid, NULL, repo, NULL, path, 0, true);
}
int git_blob_create_fromdisk(
git_oid *oid, git_repository *repo, const char *path)
{
int error;
git_buf full_path = GIT_BUF_INIT;
const char *workdir, *hintpath;
if ((error = git_path_prettify(&full_path, path, NULL)) < 0) {
git_buf_free(&full_path);
return error;
}
hintpath = git_buf_cstr(&full_path);
workdir = git_repository_workdir(repo);
if (workdir && !git__prefixcmp(hintpath, workdir))
hintpath += strlen(workdir);
error = git_blob__create_from_paths(
oid, NULL, repo, git_buf_cstr(&full_path), hintpath, 0, true);
git_buf_free(&full_path);
return error;
}
#define BUFFER_SIZE 4096
int git_blob_create_fromchunks(
git_oid *oid,
git_repository *repo,
const char *hintpath,
int (*source_cb)(char *content, size_t max_length, void *payload),
void *payload)
{
int error;
char *content = NULL;
git_filebuf file = GIT_FILEBUF_INIT;
git_buf path = GIT_BUF_INIT;
assert(oid && repo && source_cb);
if ((error = git_buf_joinpath(
&path, git_repository_path(repo), GIT_OBJECTS_DIR "streamed")) < 0)
goto cleanup;
content = git__malloc(BUFFER_SIZE);
GITERR_CHECK_ALLOC(content);
if ((error = git_filebuf_open(
&file, git_buf_cstr(&path), GIT_FILEBUF_TEMPORARY, 0666)) < 0)
goto cleanup;
while (1) {
int read_bytes = source_cb(content, BUFFER_SIZE, payload);
if (!read_bytes)
break;
if (read_bytes > BUFFER_SIZE) {
giterr_set(GITERR_OBJECT, "Invalid chunk size while creating blob");
error = GIT_EBUFS;
} else if (read_bytes < 0) {
error = giterr_set_after_callback(read_bytes);
} else {
error = git_filebuf_write(&file, content, read_bytes);
}
if (error < 0)
goto cleanup;
}
if ((error = git_filebuf_flush(&file)) < 0)
goto cleanup;
error = git_blob__create_from_paths(
oid, NULL, repo, file.path_lock, hintpath, 0, hintpath != NULL);
cleanup:
git_buf_free(&path);
git_filebuf_cleanup(&file);
git__free(content);
return error;
}
int git_blob_is_binary(git_blob *blob)
{
git_buf content;
assert(blob);
content.ptr = blob->odb_object->buffer;
content.size = min(blob->odb_object->cached.size, 4000);
content.asize = 0;
return git_buf_text_is_binary(&content);
}
int git_blob_filtered_content(
git_buf *out,
git_blob *blob,
const char *path,
int check_for_binary_data)
{
int error = 0;
git_filter_list *fl = NULL;
assert(blob && path && out);
if (check_for_binary_data && git_blob_is_binary(blob))
return 0;
if (!(error = git_filter_list_load(
&fl, git_blob_owner(blob), blob, path, GIT_FILTER_TO_WORKTREE))) {
error = git_filter_list_apply_to_blob(out, fl, blob);
git_filter_list_free(fl);
}
return error;
}
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