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/*
* Copyright (C) 2009-2012 the libgit2 contributors
*
* 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 <zlib.h>
#include "git2/object.h"
#include "fileops.h"
#include "hash.h"
#include "odb.h"
#include "delta-apply.h"
#include "filter.h"
#include "git2/odb_backend.h"
#include "git2/oid.h"
#define GIT_ALTERNATES_FILE "info/alternates"
/* TODO: is this correct? */
#define GIT_LOOSE_PRIORITY 2
#define GIT_PACKED_PRIORITY 1
#define GIT_ALTERNATES_MAX_DEPTH 5
typedef struct
{
git_odb_backend *backend;
int priority;
int is_alternate;
} backend_internal;
static int load_alternates(git_odb *odb, const char *objects_dir, int alternate_depth);
int git_odb__format_object_header(char *hdr, size_t n, size_t obj_len, git_otype obj_type)
{
const char *type_str = git_object_type2string(obj_type);
int len = p_snprintf(hdr, n, "%s %"PRIuZ, type_str, obj_len);
assert(len > 0 && len <= (int)n);
return len+1;
}
int git_odb__hashobj(git_oid *id, git_rawobj *obj)
{
git_buf_vec vec[2];
char header[64];
int hdrlen;
assert(id && obj);
if (!git_object_typeisloose(obj->type))
return -1;
if (!obj->data && obj->len != 0)
return -1;
hdrlen = git_odb__format_object_header(header, sizeof(header), obj->len, obj->type);
vec[0].data = header;
vec[0].len = hdrlen;
vec[1].data = obj->data;
vec[1].len = obj->len;
git_hash_vec(id, vec, 2);
return 0;
}
static git_odb_object *new_odb_object(const git_oid *oid, git_rawobj *source)
{
git_odb_object *object = git__malloc(sizeof(git_odb_object));
memset(object, 0x0, sizeof(git_odb_object));
git_oid_cpy(&object->cached.oid, oid);
memcpy(&object->raw, source, sizeof(git_rawobj));
return object;
}
static void free_odb_object(void *o)
{
git_odb_object *object = (git_odb_object *)o;
if (object != NULL) {
git__free(object->raw.data);
git__free(object);
}
}
const git_oid *git_odb_object_id(git_odb_object *object)
{
return &object->cached.oid;
}
const void *git_odb_object_data(git_odb_object *object)
{
return object->raw.data;
}
size_t git_odb_object_size(git_odb_object *object)
{
return object->raw.len;
}
git_otype git_odb_object_type(git_odb_object *object)
{
return object->raw.type;
}
void git_odb_object_free(git_odb_object *object)
{
if (object == NULL)
return;
git_cached_obj_decref((git_cached_obj *)object, &free_odb_object);
}
int git_odb__hashfd(git_oid *out, git_file fd, size_t size, git_otype type)
{
int hdr_len;
char hdr[64], buffer[2048];
git_hash_ctx ctx;
ssize_t read_len = 0;
int error = 0;
if (!git_object_typeisloose(type)) {
giterr_set(GITERR_INVALID, "Invalid object type for hash");
return -1;
}
if ((error = git_hash_ctx_init(&ctx)) < 0)
return -1;
hdr_len = git_odb__format_object_header(hdr, sizeof(hdr), size, type);
if ((error = git_hash_update(&ctx, hdr, hdr_len)) < 0)
goto done;
while (size > 0 && (read_len = p_read(fd, buffer, sizeof(buffer))) > 0) {
if ((error = git_hash_update(&ctx, buffer, read_len)) < 0)
goto done;
size -= read_len;
}
/* If p_read returned an error code, the read obviously failed.
* If size is not zero, the file was truncated after we originally
* stat'd it, so we consider this a read failure too */
if (read_len < 0 || size > 0) {
giterr_set(GITERR_OS, "Error reading file for hashing");
error = -1;
goto done;
return -1;
}
error = git_hash_final(out, &ctx);
done:
git_hash_ctx_cleanup(&ctx);
return error;
}
int git_odb__hashfd_filtered(
git_oid *out, git_file fd, size_t size, git_otype type, git_vector *filters)
{
int error;
git_buf raw = GIT_BUF_INIT;
git_buf filtered = GIT_BUF_INIT;
if (!filters || !filters->length)
return git_odb__hashfd(out, fd, size, type);
/* size of data is used in header, so we have to read the whole file
* into memory to apply filters before beginning to calculate the hash
*/
if (!(error = git_futils_readbuffer_fd(&raw, fd, size)))
error = git_filters_apply(&filtered, &raw, filters);
git_buf_free(&raw);
if (!error)
error = git_odb_hash(out, filtered.ptr, filtered.size, type);
git_buf_free(&filtered);
return error;
}
int git_odb__hashlink(git_oid *out, const char *path)
{
struct stat st;
git_off_t size;
int result;
if (git_path_lstat(path, &st) < 0)
return -1;
size = st.st_size;
if (!git__is_sizet(size)) {
giterr_set(GITERR_OS, "File size overflow for 32-bit systems");
return -1;
}
if (S_ISLNK(st.st_mode)) {
char *link_data;
ssize_t read_len;
link_data = git__malloc((size_t)(size + 1));
GITERR_CHECK_ALLOC(link_data);
read_len = p_readlink(path, link_data, (size_t)size);
link_data[size] = '\0';
if (read_len != (ssize_t)size) {
giterr_set(GITERR_OS, "Failed to read symlink data for '%s'", path);
return -1;
}
result = git_odb_hash(out, link_data, (size_t)size, GIT_OBJ_BLOB);
git__free(link_data);
} else {
int fd = git_futils_open_ro(path);
if (fd < 0)
return -1;
result = git_odb__hashfd(out, fd, (size_t)size, GIT_OBJ_BLOB);
p_close(fd);
}
return result;
}
int git_odb_hashfile(git_oid *out, const char *path, git_otype type)
{
git_off_t size;
int result, fd = git_futils_open_ro(path);
if (fd < 0)
return fd;
if ((size = git_futils_filesize(fd)) < 0 || !git__is_sizet(size)) {
giterr_set(GITERR_OS, "File size overflow for 32-bit systems");
p_close(fd);
return -1;
}
result = git_odb__hashfd(out, fd, (size_t)size, type);
p_close(fd);
return result;
}
int git_odb_hash(git_oid *id, const void *data, size_t len, git_otype type)
{
git_rawobj raw;
assert(id);
raw.data = (void *)data;
raw.len = len;
raw.type = type;
return git_odb__hashobj(id, &raw);
}
/**
* FAKE WSTREAM
*/
typedef struct {
git_odb_stream stream;
char *buffer;
size_t size, written;
git_otype type;
} fake_wstream;
static int fake_wstream__fwrite(git_oid *oid, git_odb_stream *_stream)
{
fake_wstream *stream = (fake_wstream *)_stream;
return _stream->backend->write(oid, _stream->backend, stream->buffer, stream->size, stream->type);
}
static int fake_wstream__write(git_odb_stream *_stream, const char *data, size_t len)
{
fake_wstream *stream = (fake_wstream *)_stream;
if (stream->written + len > stream->size)
return -1;
memcpy(stream->buffer + stream->written, data, len);
stream->written += len;
return 0;
}
static void fake_wstream__free(git_odb_stream *_stream)
{
fake_wstream *stream = (fake_wstream *)_stream;
git__free(stream->buffer);
git__free(stream);
}
static int init_fake_wstream(git_odb_stream **stream_p, git_odb_backend *backend, size_t size, git_otype type)
{
fake_wstream *stream;
stream = git__calloc(1, sizeof(fake_wstream));
GITERR_CHECK_ALLOC(stream);
stream->size = size;
stream->type = type;
stream->buffer = git__malloc(size);
if (stream->buffer == NULL) {
git__free(stream);
return -1;
}
stream->stream.backend = backend;
stream->stream.read = NULL; /* read only */
stream->stream.write = &fake_wstream__write;
stream->stream.finalize_write = &fake_wstream__fwrite;
stream->stream.free = &fake_wstream__free;
stream->stream.mode = GIT_STREAM_WRONLY;
*stream_p = (git_odb_stream *)stream;
return 0;
}
/***********************************************************
*
* OBJECT DATABASE PUBLIC API
*
* Public calls for the ODB functionality
*
***********************************************************/
static int backend_sort_cmp(const void *a, const void *b)
{
const backend_internal *backend_a = (const backend_internal *)(a);
const backend_internal *backend_b = (const backend_internal *)(b);
if (backend_a->is_alternate == backend_b->is_alternate)
return (backend_b->priority - backend_a->priority);
return backend_a->is_alternate ? 1 : -1;
}
int git_odb_new(git_odb **out)
{
git_odb *db = git__calloc(1, sizeof(*db));
GITERR_CHECK_ALLOC(db);
if (git_cache_init(&db->cache, GIT_DEFAULT_CACHE_SIZE, &free_odb_object) < 0 ||
git_vector_init(&db->backends, 4, backend_sort_cmp) < 0)
{
git__free(db);
return -1;
}
*out = db;
GIT_REFCOUNT_INC(db);
return 0;
}
static int add_backend_internal(git_odb *odb, git_odb_backend *backend, int priority, int is_alternate)
{
backend_internal *internal;
assert(odb && backend);
GITERR_CHECK_VERSION(backend, GIT_ODB_BACKEND_VERSION, "git_odb_backend");
/* Check if the backend is already owned by another ODB */
assert(!backend->odb || backend->odb == odb);
internal = git__malloc(sizeof(backend_internal));
GITERR_CHECK_ALLOC(internal);
internal->backend = backend;
internal->priority = priority;
internal->is_alternate = is_alternate;
if (git_vector_insert(&odb->backends, internal) < 0) {
git__free(internal);
return -1;
}
git_vector_sort(&odb->backends);
internal->backend->odb = odb;
return 0;
}
int git_odb_add_backend(git_odb *odb, git_odb_backend *backend, int priority)
{
return add_backend_internal(odb, backend, priority, 0);
}
int git_odb_add_alternate(git_odb *odb, git_odb_backend *backend, int priority)
{
return add_backend_internal(odb, backend, priority, 1);
}
static int add_default_backends(git_odb *db, const char *objects_dir, int as_alternates, int alternate_depth)
{
git_odb_backend *loose, *packed;
/* add the loose object backend */
if (git_odb_backend_loose(&loose, objects_dir, -1, 0) < 0 ||
add_backend_internal(db, loose, GIT_LOOSE_PRIORITY, as_alternates) < 0)
return -1;
/* add the packed file backend */
if (git_odb_backend_pack(&packed, objects_dir) < 0 ||
add_backend_internal(db, packed, GIT_PACKED_PRIORITY, as_alternates) < 0)
return -1;
return load_alternates(db, objects_dir, alternate_depth);
}
static int load_alternates(git_odb *odb, const char *objects_dir, int alternate_depth)
{
git_buf alternates_path = GIT_BUF_INIT;
git_buf alternates_buf = GIT_BUF_INIT;
char *buffer;
const char *alternate;
int result = 0;
/* Git reports an error, we just ignore anything deeper */
if (alternate_depth > GIT_ALTERNATES_MAX_DEPTH) {
return 0;
}
if (git_buf_joinpath(&alternates_path, objects_dir, GIT_ALTERNATES_FILE) < 0)
return -1;
if (git_path_exists(alternates_path.ptr) == false) {
git_buf_free(&alternates_path);
return 0;
}
if (git_futils_readbuffer(&alternates_buf, alternates_path.ptr) < 0) {
git_buf_free(&alternates_path);
return -1;
}
buffer = (char *)alternates_buf.ptr;
/* add each alternate as a new backend; one alternate per line */
while ((alternate = git__strtok(&buffer, "\r\n")) != NULL) {
if (*alternate == '\0' || *alternate == '#')
continue;
/*
* Relative path: build based on the current `objects`
* folder. However, relative paths are only allowed in
* the current repository.
*/
if (*alternate == '.' && !alternate_depth) {
if ((result = git_buf_joinpath(&alternates_path, objects_dir, alternate)) < 0)
break;
alternate = git_buf_cstr(&alternates_path);
}
if ((result = add_default_backends(odb, alternate, 1, alternate_depth + 1)) < 0)
break;
}
git_buf_free(&alternates_path);
git_buf_free(&alternates_buf);
return result;
}
int git_odb_add_disk_alternate(git_odb *odb, const char *path)
{
return add_default_backends(odb, path, 1, 0);
}
int git_odb_open(git_odb **out, const char *objects_dir)
{
git_odb *db;
assert(out && objects_dir);
*out = NULL;
if (git_odb_new(&db) < 0)
return -1;
if (add_default_backends(db, objects_dir, 0, 0) < 0) {
git_odb_free(db);
return -1;
}
*out = db;
return 0;
}
static void odb_free(git_odb *db)
{
unsigned int i;
for (i = 0; i < db->backends.length; ++i) {
backend_internal *internal = git_vector_get(&db->backends, i);
git_odb_backend *backend = internal->backend;
if (backend->free) backend->free(backend);
else git__free(backend);
git__free(internal);
}
git_vector_free(&db->backends);
git_cache_free(&db->cache);
git__free(db);
}
void git_odb_free(git_odb *db)
{
if (db == NULL)
return;
GIT_REFCOUNT_DEC(db, odb_free);
}
int git_odb_exists(git_odb *db, const git_oid *id)
{
git_odb_object *object;
unsigned int i;
bool found = false;
assert(db && id);
if ((object = git_cache_get(&db->cache, id)) != NULL) {
git_odb_object_free(object);
return (int)true;
}
for (i = 0; i < db->backends.length && !found; ++i) {
backend_internal *internal = git_vector_get(&db->backends, i);
git_odb_backend *b = internal->backend;
if (b->exists != NULL)
found = b->exists(b, id);
}
return (int)found;
}
int git_odb_read_header(size_t *len_p, git_otype *type_p, git_odb *db, const git_oid *id)
{
int error;
git_odb_object *object;
error = git_odb__read_header_or_object(&object, len_p, type_p, db, id);
if (object)
git_odb_object_free(object);
return error;
}
int git_odb__read_header_or_object(
git_odb_object **out, size_t *len_p, git_otype *type_p,
git_odb *db, const git_oid *id)
{
unsigned int i;
int error = GIT_ENOTFOUND;
git_odb_object *object;
assert(db && id && out && len_p && type_p);
if ((object = git_cache_get(&db->cache, id)) != NULL) {
*len_p = object->raw.len;
*type_p = object->raw.type;
*out = object;
return 0;
}
*out = NULL;
for (i = 0; i < db->backends.length && error < 0; ++i) {
backend_internal *internal = git_vector_get(&db->backends, i);
git_odb_backend *b = internal->backend;
if (b->read_header != NULL)
error = b->read_header(len_p, type_p, b, id);
}
if (!error || error == GIT_PASSTHROUGH)
return 0;
/*
* no backend could read only the header.
* try reading the whole object and freeing the contents
*/
if ((error = git_odb_read(&object, db, id)) < 0)
return error; /* error already set - pass along */
*len_p = object->raw.len;
*type_p = object->raw.type;
*out = object;
return 0;
}
int git_odb_read(git_odb_object **out, git_odb *db, const git_oid *id)
{
unsigned int i;
int error = GIT_ENOTFOUND;
git_rawobj raw;
assert(out && db && id);
*out = git_cache_get(&db->cache, id);
if (*out != NULL)
return 0;
for (i = 0; i < db->backends.length && error < 0; ++i) {
backend_internal *internal = git_vector_get(&db->backends, i);
git_odb_backend *b = internal->backend;
if (b->read != NULL)
error = b->read(&raw.data, &raw.len, &raw.type, b, id);
}
/* TODO: If no backends are configured, this returns GIT_ENOTFOUND but
* will never have called giterr_set().
*/
if (error && error != GIT_PASSTHROUGH)
return error;
*out = git_cache_try_store(&db->cache, new_odb_object(id, &raw));
return 0;
}
int git_odb_read_prefix(
git_odb_object **out, git_odb *db, const git_oid *short_id, size_t len)
{
unsigned int i;
int error = GIT_ENOTFOUND;
git_oid found_full_oid = {{0}};
git_rawobj raw;
void *data = NULL;
bool found = false;
assert(out && db);
if (len < GIT_OID_MINPREFIXLEN)
return git_odb__error_ambiguous("prefix length too short");
if (len > GIT_OID_HEXSZ)
len = GIT_OID_HEXSZ;
if (len == GIT_OID_HEXSZ) {
*out = git_cache_get(&db->cache, short_id);
if (*out != NULL)
return 0;
}
for (i = 0; i < db->backends.length; ++i) {
backend_internal *internal = git_vector_get(&db->backends, i);
git_odb_backend *b = internal->backend;
if (b->read != NULL) {
git_oid full_oid;
error = b->read_prefix(&full_oid, &raw.data, &raw.len, &raw.type, b, short_id, len);
if (error == GIT_ENOTFOUND || error == GIT_PASSTHROUGH)
continue;
if (error)
return error;
git__free(data);
data = raw.data;
if (found && git_oid_cmp(&full_oid, &found_full_oid))
return git_odb__error_ambiguous("multiple matches for prefix");
found_full_oid = full_oid;
found = true;
}
}
if (!found)
return git_odb__error_notfound("no match for prefix", short_id);
*out = git_cache_try_store(&db->cache, new_odb_object(&found_full_oid, &raw));
return 0;
}
int git_odb_foreach(git_odb *db, git_odb_foreach_cb cb, void *payload)
{
unsigned int i;
backend_internal *internal;
git_vector_foreach(&db->backends, i, internal) {
git_odb_backend *b = internal->backend;
int error = b->foreach(b, cb, payload);
if (error < 0)
return error;
}
return 0;
}
int git_odb_write(
git_oid *oid, git_odb *db, const void *data, size_t len, git_otype type)
{
unsigned int i;
int error = GIT_ERROR;
git_odb_stream *stream;
assert(oid && db);
for (i = 0; i < db->backends.length && error < 0; ++i) {
backend_internal *internal = git_vector_get(&db->backends, i);
git_odb_backend *b = internal->backend;
/* we don't write in alternates! */
if (internal->is_alternate)
continue;
if (b->write != NULL)
error = b->write(oid, b, data, len, type);
}
if (!error || error == GIT_PASSTHROUGH)
return 0;
/* if no backends were able to write the object directly, we try a streaming
* write to the backends; just write the whole object into the stream in one
* push */
if ((error = git_odb_open_wstream(&stream, db, len, type)) != 0)
return error;
stream->write(stream, data, len);
error = stream->finalize_write(oid, stream);
stream->free(stream);
return error;
}
int git_odb_open_wstream(
git_odb_stream **stream, git_odb *db, size_t size, git_otype type)
{
unsigned int i;
int error = GIT_ERROR;
assert(stream && db);
for (i = 0; i < db->backends.length && error < 0; ++i) {
backend_internal *internal = git_vector_get(&db->backends, i);
git_odb_backend *b = internal->backend;
/* we don't write in alternates! */
if (internal->is_alternate)
continue;
if (b->writestream != NULL)
error = b->writestream(stream, b, size, type);
else if (b->write != NULL)
error = init_fake_wstream(stream, b, size, type);
}
if (error == GIT_PASSTHROUGH)
error = 0;
return error;
}
int git_odb_open_rstream(git_odb_stream **stream, git_odb *db, const git_oid *oid)
{
unsigned int i;
int error = GIT_ERROR;
assert(stream && db);
for (i = 0; i < db->backends.length && error < 0; ++i) {
backend_internal *internal = git_vector_get(&db->backends, i);
git_odb_backend *b = internal->backend;
if (b->readstream != NULL)
error = b->readstream(stream, b, oid);
}
if (error == GIT_PASSTHROUGH)
error = 0;
return error;
}
int git_odb_write_pack(struct git_odb_writepack **out, git_odb *db, git_transfer_progress_callback progress_cb, void *progress_payload)
{
unsigned int i;
int error = GIT_ERROR;
assert(out && db);
for (i = 0; i < db->backends.length && error < 0; ++i) {
backend_internal *internal = git_vector_get(&db->backends, i);
git_odb_backend *b = internal->backend;
/* we don't write in alternates! */
if (internal->is_alternate)
continue;
if (b->writepack != NULL)
error = b->writepack(out, b, progress_cb, progress_payload);
}
if (error == GIT_PASSTHROUGH)
error = 0;
return error;
}
void * git_odb_backend_malloc(git_odb_backend *backend, size_t len)
{
GIT_UNUSED(backend);
return git__malloc(len);
}
int git_odb__error_notfound(const char *message, const git_oid *oid)
{
if (oid != NULL) {
char oid_str[GIT_OID_HEXSZ + 1];
git_oid_tostr(oid_str, sizeof(oid_str), oid);
giterr_set(GITERR_ODB, "Object not found - %s (%s)", message, oid_str);
} else
giterr_set(GITERR_ODB, "Object not found - %s", message);
return GIT_ENOTFOUND;
}
int git_odb__error_ambiguous(const char *message)
{
giterr_set(GITERR_ODB, "Ambiguous SHA1 prefix - %s", message);
return GIT_EAMBIGUOUS;
}
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