mirror of
https://github.com/git/git
synced 2024-08-27 19:49:21 +00:00
![Jeff King](/assets/img/avatar_default.png)
Each caller of sha1_object_info_extended sets up an object_info struct to tell the function which elements of the object it wants to get. Until now, getting the type of the object has always been required (and it is returned via the return type rather than a pointer in object_info). This can involve actually opening a loose object file to determine its type, or following delta chains to determine a packed file's base type. These effects produce a measurable slow-down when doing a "cat-file --batch-check" that does not include %(objecttype). This patch adds a "typep" query to struct object_info, so that it can be optionally queried just like size and disk_size. As a result, the return type of the function is no longer the object type, but rather 0/-1 for success/error. As there are only three callers total, we just fix up each caller rather than keep a compatibility wrapper: 1. The simpler sha1_object_info wrapper continues to always ask for and return the type field. 2. The istream_source function wants to know the type, and so always asks for it. 3. The cat-file batch code asks for the type only when %(objecttype) is part of the format string. On linux.git, the best-of-five for running: $ git rev-list --objects --all >objects $ time git cat-file --batch-check='%(objectsize:disk)' on a fully packed repository goes from: real 0m8.680s user 0m8.160s sys 0m0.512s to: real 0m7.205s user 0m6.580s sys 0m0.608s Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
387 lines
9.5 KiB
C
387 lines
9.5 KiB
C
/*
|
|
* GIT - The information manager from hell
|
|
*
|
|
* Copyright (C) Linus Torvalds, 2005
|
|
*/
|
|
#include "cache.h"
|
|
#include "exec_cmd.h"
|
|
#include "tag.h"
|
|
#include "tree.h"
|
|
#include "builtin.h"
|
|
#include "parse-options.h"
|
|
#include "diff.h"
|
|
#include "userdiff.h"
|
|
#include "streaming.h"
|
|
|
|
static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
|
|
{
|
|
unsigned char sha1[20];
|
|
enum object_type type;
|
|
char *buf;
|
|
unsigned long size;
|
|
struct object_context obj_context;
|
|
|
|
if (get_sha1_with_context(obj_name, 0, sha1, &obj_context))
|
|
die("Not a valid object name %s", obj_name);
|
|
|
|
buf = NULL;
|
|
switch (opt) {
|
|
case 't':
|
|
type = sha1_object_info(sha1, NULL);
|
|
if (type > 0) {
|
|
printf("%s\n", typename(type));
|
|
return 0;
|
|
}
|
|
break;
|
|
|
|
case 's':
|
|
type = sha1_object_info(sha1, &size);
|
|
if (type > 0) {
|
|
printf("%lu\n", size);
|
|
return 0;
|
|
}
|
|
break;
|
|
|
|
case 'e':
|
|
return !has_sha1_file(sha1);
|
|
|
|
case 'p':
|
|
type = sha1_object_info(sha1, NULL);
|
|
if (type < 0)
|
|
die("Not a valid object name %s", obj_name);
|
|
|
|
/* custom pretty-print here */
|
|
if (type == OBJ_TREE) {
|
|
const char *ls_args[3] = { NULL };
|
|
ls_args[0] = "ls-tree";
|
|
ls_args[1] = obj_name;
|
|
return cmd_ls_tree(2, ls_args, NULL);
|
|
}
|
|
|
|
if (type == OBJ_BLOB)
|
|
return stream_blob_to_fd(1, sha1, NULL, 0);
|
|
buf = read_sha1_file(sha1, &type, &size);
|
|
if (!buf)
|
|
die("Cannot read object %s", obj_name);
|
|
|
|
/* otherwise just spit out the data */
|
|
break;
|
|
|
|
case 'c':
|
|
if (!obj_context.path[0])
|
|
die("git cat-file --textconv %s: <object> must be <sha1:path>",
|
|
obj_name);
|
|
|
|
if (!textconv_object(obj_context.path, obj_context.mode, sha1, 1, &buf, &size))
|
|
die("git cat-file --textconv: unable to run textconv on %s",
|
|
obj_name);
|
|
break;
|
|
|
|
case 0:
|
|
if (type_from_string(exp_type) == OBJ_BLOB) {
|
|
unsigned char blob_sha1[20];
|
|
if (sha1_object_info(sha1, NULL) == OBJ_TAG) {
|
|
enum object_type type;
|
|
unsigned long size;
|
|
char *buffer = read_sha1_file(sha1, &type, &size);
|
|
if (memcmp(buffer, "object ", 7) ||
|
|
get_sha1_hex(buffer + 7, blob_sha1))
|
|
die("%s not a valid tag", sha1_to_hex(sha1));
|
|
free(buffer);
|
|
} else
|
|
hashcpy(blob_sha1, sha1);
|
|
|
|
if (sha1_object_info(blob_sha1, NULL) == OBJ_BLOB)
|
|
return stream_blob_to_fd(1, blob_sha1, NULL, 0);
|
|
/*
|
|
* we attempted to dereference a tag to a blob
|
|
* and failed; there may be new dereference
|
|
* mechanisms this code is not aware of.
|
|
* fall-back to the usual case.
|
|
*/
|
|
}
|
|
buf = read_object_with_reference(sha1, exp_type, &size, NULL);
|
|
break;
|
|
|
|
default:
|
|
die("git cat-file: unknown option: %s", exp_type);
|
|
}
|
|
|
|
if (!buf)
|
|
die("git cat-file %s: bad file", obj_name);
|
|
|
|
write_or_die(1, buf, size);
|
|
return 0;
|
|
}
|
|
|
|
struct expand_data {
|
|
unsigned char sha1[20];
|
|
enum object_type type;
|
|
unsigned long size;
|
|
unsigned long disk_size;
|
|
const char *rest;
|
|
|
|
/*
|
|
* If mark_query is true, we do not expand anything, but rather
|
|
* just mark the object_info with items we wish to query.
|
|
*/
|
|
int mark_query;
|
|
|
|
/*
|
|
* After a mark_query run, this object_info is set up to be
|
|
* passed to sha1_object_info_extended. It will point to the data
|
|
* elements above, so you can retrieve the response from there.
|
|
*/
|
|
struct object_info info;
|
|
};
|
|
|
|
static int is_atom(const char *atom, const char *s, int slen)
|
|
{
|
|
int alen = strlen(atom);
|
|
return alen == slen && !memcmp(atom, s, alen);
|
|
}
|
|
|
|
static void expand_atom(struct strbuf *sb, const char *atom, int len,
|
|
void *vdata)
|
|
{
|
|
struct expand_data *data = vdata;
|
|
|
|
if (is_atom("objectname", atom, len)) {
|
|
if (!data->mark_query)
|
|
strbuf_addstr(sb, sha1_to_hex(data->sha1));
|
|
} else if (is_atom("objecttype", atom, len)) {
|
|
if (data->mark_query)
|
|
data->info.typep = &data->type;
|
|
else
|
|
strbuf_addstr(sb, typename(data->type));
|
|
} else if (is_atom("objectsize", atom, len)) {
|
|
if (data->mark_query)
|
|
data->info.sizep = &data->size;
|
|
else
|
|
strbuf_addf(sb, "%lu", data->size);
|
|
} else if (is_atom("objectsize:disk", atom, len)) {
|
|
if (data->mark_query)
|
|
data->info.disk_sizep = &data->disk_size;
|
|
else
|
|
strbuf_addf(sb, "%lu", data->disk_size);
|
|
} else if (is_atom("rest", atom, len)) {
|
|
if (!data->mark_query && data->rest)
|
|
strbuf_addstr(sb, data->rest);
|
|
} else
|
|
die("unknown format element: %.*s", len, atom);
|
|
}
|
|
|
|
static size_t expand_format(struct strbuf *sb, const char *start, void *data)
|
|
{
|
|
const char *end;
|
|
|
|
if (*start != '(')
|
|
return 0;
|
|
end = strchr(start + 1, ')');
|
|
if (!end)
|
|
die("format element '%s' does not end in ')'", start);
|
|
|
|
expand_atom(sb, start + 1, end - start - 1, data);
|
|
|
|
return end - start + 1;
|
|
}
|
|
|
|
static void print_object_or_die(int fd, const unsigned char *sha1,
|
|
enum object_type type, unsigned long size)
|
|
{
|
|
if (type == OBJ_BLOB) {
|
|
if (stream_blob_to_fd(fd, sha1, NULL, 0) < 0)
|
|
die("unable to stream %s to stdout", sha1_to_hex(sha1));
|
|
}
|
|
else {
|
|
enum object_type rtype;
|
|
unsigned long rsize;
|
|
void *contents;
|
|
|
|
contents = read_sha1_file(sha1, &rtype, &rsize);
|
|
if (!contents)
|
|
die("object %s disappeared", sha1_to_hex(sha1));
|
|
if (rtype != type)
|
|
die("object %s changed type!?", sha1_to_hex(sha1));
|
|
if (rsize != size)
|
|
die("object %s change size!?", sha1_to_hex(sha1));
|
|
|
|
write_or_die(fd, contents, size);
|
|
free(contents);
|
|
}
|
|
}
|
|
|
|
struct batch_options {
|
|
int enabled;
|
|
int print_contents;
|
|
const char *format;
|
|
};
|
|
|
|
static int batch_one_object(const char *obj_name, struct batch_options *opt,
|
|
struct expand_data *data)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
|
|
if (!obj_name)
|
|
return 1;
|
|
|
|
if (get_sha1(obj_name, data->sha1)) {
|
|
printf("%s missing\n", obj_name);
|
|
fflush(stdout);
|
|
return 0;
|
|
}
|
|
|
|
if (sha1_object_info_extended(data->sha1, &data->info) < 0) {
|
|
printf("%s missing\n", obj_name);
|
|
fflush(stdout);
|
|
return 0;
|
|
}
|
|
|
|
strbuf_expand(&buf, opt->format, expand_format, data);
|
|
strbuf_addch(&buf, '\n');
|
|
write_or_die(1, buf.buf, buf.len);
|
|
strbuf_release(&buf);
|
|
|
|
if (opt->print_contents) {
|
|
print_object_or_die(1, data->sha1, data->type, data->size);
|
|
write_or_die(1, "\n", 1);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int batch_objects(struct batch_options *opt)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
struct expand_data data;
|
|
|
|
if (!opt->format)
|
|
opt->format = "%(objectname) %(objecttype) %(objectsize)";
|
|
|
|
/*
|
|
* Expand once with our special mark_query flag, which will prime the
|
|
* object_info to be handed to sha1_object_info_extended for each
|
|
* object.
|
|
*/
|
|
memset(&data, 0, sizeof(data));
|
|
data.mark_query = 1;
|
|
strbuf_expand(&buf, opt->format, expand_format, &data);
|
|
data.mark_query = 0;
|
|
|
|
/*
|
|
* We are going to call get_sha1 on a potentially very large number of
|
|
* objects. In most large cases, these will be actual object sha1s. The
|
|
* cost to double-check that each one is not also a ref (just so we can
|
|
* warn) ends up dwarfing the actual cost of the object lookups
|
|
* themselves. We can work around it by just turning off the warning.
|
|
*/
|
|
warn_on_object_refname_ambiguity = 0;
|
|
|
|
while (strbuf_getline(&buf, stdin, '\n') != EOF) {
|
|
char *p;
|
|
int error;
|
|
|
|
/*
|
|
* Split at first whitespace, tying off the beginning of the
|
|
* string and saving the remainder (or NULL) in data.rest.
|
|
*/
|
|
p = strpbrk(buf.buf, " \t");
|
|
if (p) {
|
|
while (*p && strchr(" \t", *p))
|
|
*p++ = '\0';
|
|
}
|
|
data.rest = p;
|
|
|
|
error = batch_one_object(buf.buf, opt, &data);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char * const cat_file_usage[] = {
|
|
N_("git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>"),
|
|
N_("git cat-file (--batch|--batch-check) < <list_of_objects>"),
|
|
NULL
|
|
};
|
|
|
|
static int git_cat_file_config(const char *var, const char *value, void *cb)
|
|
{
|
|
if (userdiff_config(var, value) < 0)
|
|
return -1;
|
|
|
|
return git_default_config(var, value, cb);
|
|
}
|
|
|
|
static int batch_option_callback(const struct option *opt,
|
|
const char *arg,
|
|
int unset)
|
|
{
|
|
struct batch_options *bo = opt->value;
|
|
|
|
if (unset) {
|
|
memset(bo, 0, sizeof(*bo));
|
|
return 0;
|
|
}
|
|
|
|
bo->enabled = 1;
|
|
bo->print_contents = !strcmp(opt->long_name, "batch");
|
|
bo->format = arg;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cmd_cat_file(int argc, const char **argv, const char *prefix)
|
|
{
|
|
int opt = 0;
|
|
const char *exp_type = NULL, *obj_name = NULL;
|
|
struct batch_options batch = {0};
|
|
|
|
const struct option options[] = {
|
|
OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
|
|
OPT_SET_INT('t', NULL, &opt, N_("show object type"), 't'),
|
|
OPT_SET_INT('s', NULL, &opt, N_("show object size"), 's'),
|
|
OPT_SET_INT('e', NULL, &opt,
|
|
N_("exit with zero when there's no error"), 'e'),
|
|
OPT_SET_INT('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
|
|
OPT_SET_INT(0, "textconv", &opt,
|
|
N_("for blob objects, run textconv on object's content"), 'c'),
|
|
{ OPTION_CALLBACK, 0, "batch", &batch, "format",
|
|
N_("show info and content of objects fed from the standard input"),
|
|
PARSE_OPT_OPTARG, batch_option_callback },
|
|
{ OPTION_CALLBACK, 0, "batch-check", &batch, "format",
|
|
N_("show info about objects fed from the standard input"),
|
|
PARSE_OPT_OPTARG, batch_option_callback },
|
|
OPT_END()
|
|
};
|
|
|
|
git_config(git_cat_file_config, NULL);
|
|
|
|
if (argc != 3 && argc != 2)
|
|
usage_with_options(cat_file_usage, options);
|
|
|
|
argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
|
|
|
|
if (opt) {
|
|
if (argc == 1)
|
|
obj_name = argv[0];
|
|
else
|
|
usage_with_options(cat_file_usage, options);
|
|
}
|
|
if (!opt && !batch.enabled) {
|
|
if (argc == 2) {
|
|
exp_type = argv[0];
|
|
obj_name = argv[1];
|
|
} else
|
|
usage_with_options(cat_file_usage, options);
|
|
}
|
|
if (batch.enabled && (opt || argc)) {
|
|
usage_with_options(cat_file_usage, options);
|
|
}
|
|
|
|
if (batch.enabled)
|
|
return batch_objects(&batch);
|
|
|
|
return cat_one_file(opt, exp_type, obj_name);
|
|
}
|