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Commit e17a3f56 by Ramsay Jones Committed by Andreas Ericsson
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Implement git_odb_write() 

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Andreas Ericsson <ae@op5.se>
parent ca481fc4
Showing with 734 additions and 4 deletions
src/git/odb.h
......@@ -96,6 +96,18 @@ GIT_EXTERN(int) git_odb__read_packed(git_obj *out, git_odb *db, const git_oid *i
GIT_EXTERN(int) git_odb__read_loose(git_obj *out, git_odb *db, const git_oid *id);
/**
* Write an object to the database.
*
* @param id identity of the object written.
* @param db database to which the object should be written.
* @param obj object descriptor for the object to write.
* @return
* - GIT_SUCCESS if the object was written;
* - GIT_ERROR otherwise.
*/
GIT_EXTERN(int) git_odb_write(git_oid *id, git_odb *db, git_obj *obj);
/**
* Release all memory used by the obj structure.
*
* As a result of this call, obj->data will be set to NULL.
......
src/odb.c
......@@ -85,6 +85,11 @@ struct git_odb {
/** Alternate databases to search. */
git_odb **alternates;
size_t n_alternates;
/** loose object zlib compression level. */
int object_zlib_level;
/** loose object file fsync flag. */
int fsync_object_files;
};
typedef struct { /* object header data */
......@@ -158,13 +163,12 @@ static int format_object_header(char *hdr, size_t n, git_obj *obj)
return len+1;
}
int git_obj_hash(git_oid *id, git_obj *obj)
static int hash_obj(git_oid *id, char *hdr, size_t n, int *len, git_obj *obj)
{
git_buf_vec vec[2];
char hdr[64];
int hdrlen;
assert(id && obj);
assert(id && hdr && len && obj);
if (!git_obj__loose_object_type(obj->type))
return GIT_ERROR;
......@@ -172,9 +176,11 @@ int git_obj_hash(git_oid *id, git_obj *obj)
if (!obj->data && obj->len != 0)
return GIT_ERROR;
if ((hdrlen = format_object_header(hdr, sizeof(hdr), obj)) < 0)
if ((hdrlen = format_object_header(hdr, n, obj)) < 0)
return GIT_ERROR;
*len = hdrlen;
vec[0].data = hdr;
vec[0].len = hdrlen;
vec[1].data = obj->data;
......@@ -185,6 +191,16 @@ int git_obj_hash(git_oid *id, git_obj *obj)
return GIT_SUCCESS;
}
int git_obj_hash(git_oid *id, git_obj *obj)
{
char hdr[64];
int hdrlen;
assert(id && obj);
return hash_obj(id, hdr, sizeof(hdr), &hdrlen, obj);
}
static size_t object_file_name(char *name, size_t n, char *dir, const git_oid *id)
{
size_t len = strlen(dir);
......@@ -483,6 +499,125 @@ static int inflate_disk_obj(git_obj *out, gitfo_buf *obj)
return GIT_SUCCESS;
}
static int make_temp_file(git_file *fd, char *tmp, size_t n, char *file)
{
char *template = "/tmp_obj_XXXXXX";
size_t tmplen = strlen(template);
size_t dirlen;
if ((dirlen = git__dirname(tmp, n, file)) < 0)
return GIT_ERROR;
if ((dirlen + tmplen) >= n)
return GIT_ERROR;
strcpy(tmp + dirlen, (dirlen) ? template : template + 1);
*fd = gitfo_mkstemp(tmp);
if (*fd < 0 && dirlen) {
/* create directory if it doesn't exist */
tmp[dirlen] = '\0';
if ((gitfo_exists(tmp) < 0) && gitfo_mkdir(tmp, 0755))
return GIT_ERROR;
/* try again */
strcpy(tmp + dirlen, template);
*fd = gitfo_mkstemp(tmp);
}
if (*fd < 0)
return GIT_ERROR;
return GIT_SUCCESS;
}
static int deflate_buf(z_stream *s, void *in, size_t len, int flush)
{
int status = Z_OK;
set_stream_input(s, in, len);
while (status == Z_OK) {
status = deflate(s, flush);
if (s->avail_in == 0)
break;
}
return status;
}
static int deflate_obj(gitfo_buf *buf, char *hdr, int hdrlen, git_obj *obj, int level)
{
z_stream zs;
int status;
size_t size;
assert(buf && !buf->data && hdr && obj);
assert(level == Z_DEFAULT_COMPRESSION || (level >= 0 && level <= 9));
buf->data = NULL;
buf->len = 0;
init_stream(&zs, NULL, 0);
if (deflateInit(&zs, level) < Z_OK)
return GIT_ERROR;
size = deflateBound(&zs, hdrlen + obj->len);
if ((buf->data = git__malloc(size)) == NULL) {
deflateEnd(&zs);
return GIT_ERROR;
}
set_stream_output(&zs, buf->data, size);
/* compress the header */
status = deflate_buf(&zs, hdr, hdrlen, Z_NO_FLUSH);
/* if header compressed OK, compress the object */
if (status == Z_OK)
status = deflate_buf(&zs, obj->data, obj->len, Z_FINISH);
if (status != Z_STREAM_END) {
deflateEnd(&zs);
free(buf->data);
buf->data = NULL;
return GIT_ERROR;
}
buf->len = zs.total_out;
deflateEnd(&zs);
return GIT_SUCCESS;
}
static int write_obj(gitfo_buf *buf, git_oid *id, git_odb *db)
{
char file[GIT_PATH_MAX];
char temp[GIT_PATH_MAX];
git_file fd;
if (object_file_name(file, sizeof(file), db->objects_dir, id))
return GIT_ERROR;
if (make_temp_file(&fd, temp, sizeof(temp), file) < 0)
return GIT_ERROR;
if (gitfo_write(fd, buf->data, buf->len) < 0) {
gitfo_close(fd);
gitfo_unlink(temp);
return GIT_ERROR;
}
if (db->fsync_object_files)
gitfo_fsync(fd);
gitfo_close(fd);
gitfo_chmod(temp, 0444);
if (gitfo_move_file(temp, file) < 0) {
gitfo_unlink(temp);
return GIT_ERROR;
}
return GIT_SUCCESS;
}
static int open_alternates(git_odb *db)
{
unsigned n = 0;
......@@ -891,6 +1026,9 @@ int git_odb_open(git_odb **out, const char *objects_dir)
gitlck_init(&db->lock);
db->object_zlib_level = Z_BEST_SPEED;
db->fsync_object_files = 0;
*out = db;
return GIT_SUCCESS;
}
......@@ -1004,3 +1142,30 @@ int git_odb__read_packed(git_obj *out, git_odb *db, const git_oid *id)
return GIT_ENOTFOUND;
}
int git_odb_write(git_oid *id, git_odb *db, git_obj *obj)
{
char hdr[64];
int hdrlen;
gitfo_buf buf = GITFO_BUF_INIT;
assert(id && db && obj);
if (hash_obj(id, hdr, sizeof(hdr), &hdrlen, obj) < 0)
return GIT_ERROR;
if (git_odb_exists(db, id))
return GIT_SUCCESS;
if (deflate_obj(&buf, hdr, hdrlen, obj, db->object_zlib_level) < 0)
return GIT_ERROR;
if (write_obj(&buf, id, db) < 0) {
gitfo_free_buf(&buf);
return GIT_ERROR;
}
gitfo_free_buf(&buf);
return GIT_SUCCESS;
}
tests/NAMING
......@@ -18,3 +18,5 @@ Categories
addressable store.
02__: Basic object read access.
03__: Basic object writing.
tests/t0301-write.c 0 → 100644
#include "test_lib.h"
#include <git/odb.h>
#include "fileops.h"
static char *odb_dir = "test-objects";
typedef struct object_data {
char *id; /* object id (sha1) */
char *dir; /* object store (fan-out) directory name */
char *file; /* object store filename */
} object_data;
static object_data commit = {
"3d7f8a6af076c8c3f20071a8935cdbe8228594d1",
"test-objects/3d",
"test-objects/3d/7f8a6af076c8c3f20071a8935cdbe8228594d1",
};
static unsigned char commit_data[] = {
0x74, 0x72, 0x65, 0x65, 0x20, 0x64, 0x66, 0x66,
0x32, 0x64, 0x61, 0x39, 0x30, 0x62, 0x32, 0x35,
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0x6d, 0x70, 0x6c, 0x65, 0x2e, 0x63, 0x6f, 0x6d,
0x3e, 0x0a,
};
static git_obj commit_obj = {
commit_data,
sizeof(commit_data),
GIT_OBJ_COMMIT
};
static object_data tree = {
"dff2da90b254e1beb889d1f1f1288be1803782df",
"test-objects/df",
"test-objects/df/f2da90b254e1beb889d1f1f1288be1803782df",
};
static unsigned char tree_data[] = {
0x31, 0x30, 0x30, 0x36, 0x34, 0x34, 0x20, 0x6f,
0x6e, 0x65, 0x00, 0x8b, 0x13, 0x78, 0x91, 0x79,
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0xd6, 0x43, 0x4b, 0x8b, 0x29, 0xae, 0x77, 0x5a,
0xd8, 0xc2, 0xe4, 0x8c, 0x53, 0x91,
};
static git_obj tree_obj = {
tree_data,
sizeof(tree_data),
GIT_OBJ_TREE
};
static object_data tag = {
"09d373e1dfdc16b129ceec6dd649739911541e05",
"test-objects/09",
"test-objects/09/d373e1dfdc16b129ceec6dd649739911541e05",
};
static unsigned char tag_data[] = {
0x6f, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x20, 0x33,
0x64, 0x37, 0x66, 0x38, 0x61, 0x36, 0x61, 0x66,
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0x32, 0x30, 0x30, 0x37, 0x31, 0x61, 0x38, 0x39,
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0x32, 0x38, 0x35, 0x39, 0x34, 0x64, 0x31, 0x0a,
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};
static git_obj tag_obj = {
tag_data,
sizeof(tag_data),
GIT_OBJ_TAG
};
static object_data zero = {
"e69de29bb2d1d6434b8b29ae775ad8c2e48c5391",
"test-objects/e6",
"test-objects/e6/9de29bb2d1d6434b8b29ae775ad8c2e48c5391",
};
static unsigned char zero_data[] = {
0x00 /* dummy data */
};
static git_obj zero_obj = {
zero_data,
0,
GIT_OBJ_BLOB
};
static object_data one = {
"8b137891791fe96927ad78e64b0aad7bded08bdc",
"test-objects/8b",
"test-objects/8b/137891791fe96927ad78e64b0aad7bded08bdc",
};
static unsigned char one_data[] = {
0x0a,
};
static git_obj one_obj = {
one_data,
sizeof(one_data),
GIT_OBJ_BLOB
};
static object_data two = {
"78981922613b2afb6025042ff6bd878ac1994e85",
"test-objects/78",
"test-objects/78/981922613b2afb6025042ff6bd878ac1994e85",
};
static unsigned char two_data[] = {
0x61, 0x0a,
};
static git_obj two_obj = {
two_data,
sizeof(two_data),
GIT_OBJ_BLOB
};
static object_data some = {
"fd8430bc864cfcd5f10e5590f8a447e01b942bfe",
"test-objects/fd",
"test-objects/fd/8430bc864cfcd5f10e5590f8a447e01b942bfe",
};
static unsigned char some_data[] = {
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};
static git_obj some_obj = {
some_data,
sizeof(some_data),
GIT_OBJ_BLOB
};
static int make_odb_dir(void)
{
if (gitfo_mkdir(odb_dir, 0755) < 0) {
if (errno == EEXIST) {
fprintf(stderr, "odb directory \"%s\" already exists!\n", odb_dir);
return -1;
}
fprintf(stderr, "can't make odb directory \"%s\"\n", odb_dir);
return -1;
}
return 0;
}
static int remove_object_files(object_data *d)
{
if (gitfo_unlink(d->file) < 0) {
fprintf(stderr, "can't delete object file \"%s\"\n", d->file);
return -1;
}
if ((gitfo_rmdir(d->dir) < 0) && (errno != ENOTEMPTY)) {
fprintf(stderr, "can't remove object directory \"%s\"\n", d->dir);
return -1;
}
if (gitfo_rmdir(odb_dir) < 0) {
fprintf(stderr, "can't remove odb directory \"%s\"\n", odb_dir);
return -1;
}
return 0;
}
static int check_object_files(object_data *d)
{
if (gitfo_exists(d->dir) < 0)
return -1;
if (gitfo_exists(d->file) < 0)
return -1;
return 0;
}
static int cmp_objects(git_obj *o1, git_obj *o2)
{
if (o1->type != o2->type)
return -1;
if (o1->len != o2->len)
return -1;
if ((o1->len > 0) && (memcmp(o1->data, o2->data, o1->len) != 0))
return -1;
return 0;
}
BEGIN_TEST(write_commit)
git_odb *db;
git_oid id1, id2;
git_obj obj;
must_pass(make_odb_dir());
must_pass(git_odb_open(&db, odb_dir));
must_pass(git_oid_mkstr(&id1, commit.id));
must_pass(git_odb_write(&id2, db, &commit_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
must_pass(check_object_files(&commit));
must_pass(git_odb__read_loose(&obj, db, &id1));
must_pass(cmp_objects(&obj, &commit_obj));
git_obj_close(&obj);
git_odb_close(db);
must_pass(remove_object_files(&commit));
END_TEST
BEGIN_TEST(write_tree)
git_odb *db;
git_oid id1, id2;
git_obj obj;
must_pass(make_odb_dir());
must_pass(git_odb_open(&db, odb_dir));
must_pass(git_oid_mkstr(&id1, tree.id));
must_pass(git_odb_write(&id2, db, &tree_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
must_pass(check_object_files(&tree));
must_pass(git_odb__read_loose(&obj, db, &id1));
must_pass(cmp_objects(&obj, &tree_obj));
git_obj_close(&obj);
git_odb_close(db);
must_pass(remove_object_files(&tree));
END_TEST
BEGIN_TEST(write_tag)
git_odb *db;
git_oid id1, id2;
git_obj obj;
must_pass(make_odb_dir());
must_pass(git_odb_open(&db, odb_dir));
must_pass(git_oid_mkstr(&id1, tag.id));
must_pass(git_odb_write(&id2, db, &tag_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
must_pass(check_object_files(&tag));
must_pass(git_odb__read_loose(&obj, db, &id1));
must_pass(cmp_objects(&obj, &tag_obj));
git_obj_close(&obj);
git_odb_close(db);
must_pass(remove_object_files(&tag));
END_TEST
BEGIN_TEST(write_zero)
git_odb *db;
git_oid id1, id2;
git_obj obj;
must_pass(make_odb_dir());
must_pass(git_odb_open(&db, odb_dir));
must_pass(git_oid_mkstr(&id1, zero.id));
must_pass(git_odb_write(&id2, db, &zero_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
must_pass(check_object_files(&zero));
must_pass(git_odb__read_loose(&obj, db, &id1));
must_pass(cmp_objects(&obj, &zero_obj));
git_obj_close(&obj);
git_odb_close(db);
must_pass(remove_object_files(&zero));
END_TEST
BEGIN_TEST(write_one)
git_odb *db;
git_oid id1, id2;
git_obj obj;
must_pass(make_odb_dir());
must_pass(git_odb_open(&db, odb_dir));
must_pass(git_oid_mkstr(&id1, one.id));
must_pass(git_odb_write(&id2, db, &one_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
must_pass(check_object_files(&one));
must_pass(git_odb__read_loose(&obj, db, &id1));
must_pass(cmp_objects(&obj, &one_obj));
git_obj_close(&obj);
git_odb_close(db);
must_pass(remove_object_files(&one));
END_TEST
BEGIN_TEST(write_two)
git_odb *db;
git_oid id1, id2;
git_obj obj;
must_pass(make_odb_dir());
must_pass(git_odb_open(&db, odb_dir));
must_pass(git_oid_mkstr(&id1, two.id));
must_pass(git_odb_write(&id2, db, &two_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
must_pass(check_object_files(&two));
must_pass(git_odb__read_loose(&obj, db, &id1));
must_pass(cmp_objects(&obj, &two_obj));
git_obj_close(&obj);
git_odb_close(db);
must_pass(remove_object_files(&two));
END_TEST
BEGIN_TEST(write_some)
git_odb *db;
git_oid id1, id2;
git_obj obj;
must_pass(make_odb_dir());
must_pass(git_odb_open(&db, odb_dir));
must_pass(git_oid_mkstr(&id1, some.id));
must_pass(git_odb_write(&id2, db, &some_obj));
must_be_true(git_oid_cmp(&id1, &id2) == 0);
must_pass(check_object_files(&some));
must_pass(git_odb__read_loose(&obj, db, &id1));
must_pass(cmp_objects(&obj, &some_obj));
git_obj_close(&obj);
git_odb_close(db);
must_pass(remove_object_files(&some));
END_TEST
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