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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.h>
#include "cli.h"
#include "cmd.h"
typedef enum {
DISPLAY_CONTENT = 0,
DISPLAY_EXISTS,
DISPLAY_PRETTY,
DISPLAY_SIZE,
DISPLAY_TYPE
} display_t;
typedef int (raw_cb)(const unsigned char *data, size_t size);
static int show_help;
static int display = DISPLAY_CONTENT;
static char *type_name, *object_spec;
static const cli_opt_spec opts[] = {
{ CLI_OPT_SWITCH, "help", 0, &show_help, 1, NULL, "display help about the cat-file command", CLI_OPT_USAGE_HIDDEN },
{ CLI_OPT_SWITCH, NULL, 't', &display, DISPLAY_TYPE, NULL, "display the type of the object", CLI_OPT_USAGE_REQUIRED },
{ CLI_OPT_SWITCH, NULL, 's', &display, DISPLAY_SIZE, NULL, "display the size of the object", CLI_OPT_USAGE_REQUIRED | CLI_OPT_USAGE_CHOICE },
{ CLI_OPT_SWITCH, NULL, 'e', &display, DISPLAY_EXISTS, NULL, "displays nothing unless the object is corrupt", CLI_OPT_USAGE_REQUIRED | CLI_OPT_USAGE_CHOICE },
{ CLI_OPT_SWITCH, NULL, 'p', &display, DISPLAY_PRETTY, NULL, "pretty-print the object", CLI_OPT_USAGE_REQUIRED | CLI_OPT_USAGE_CHOICE },
{ CLI_OPT_ARG, "type", 0, &type_name, 0, "type", "the type of object to display", CLI_OPT_USAGE_REQUIRED | CLI_OPT_USAGE_CHOICE },
{ CLI_OPT_ARG, "object", 0, &object_spec, 0, "object", "the object to display", CLI_OPT_USAGE_REQUIRED },
{ 0 },
};
static void print_help(void)
{
cli_opt_usage_fprint(stdout, PROGRAM_NAME, "cat-file", opts);
printf("\n");
printf("Display the content for the given object in the repository.\n");
printf("\n");
printf("Options:\n");
cli_opt_help_fprint(stdout, opts);
}
static int print_odb(git_object *object, display_t display)
{
git_odb *odb = NULL;
git_odb_object *odb_object = NULL;
const unsigned char *content;
git_object_size_t size;
int error = 0;
/*
* Our parsed blobs retain the raw content; all other objects are
* parsed into a working representation. To get the raw content,
* we need to do an ODB lookup. (Thankfully, this should be cached
* in-memory from our last call.)
*/
if (git_object_type(object) == GIT_OBJECT_BLOB) {
content = git_blob_rawcontent((git_blob *)object);
size = git_blob_rawsize((git_blob *)object);
} else {
if ((error = git_repository_odb(&odb, git_object_owner(object))) < 0 ||
(error = git_odb_read(&odb_object, odb, git_object_id(object))) < 0) {
fprintf(stderr, "%s: %s\n", PROGRAM_NAME, git_error_last()->message);
error = 1;
goto done;
}
content = git_odb_object_data(odb_object);
size = git_odb_object_size(odb_object);
}
switch (display) {
case DISPLAY_SIZE:
error = printf("%" PRIu64 "\n", size);
break;
case DISPLAY_CONTENT:
error = p_write(fileno(stdout), content, (size_t)size);
break;
default:
abort();
}
if (error < 0)
perror(PROGRAM_NAME);
done:
git_odb_object_free(odb_object);
git_odb_free(odb);
return error < 0 ? 1 : 0;
}
static int print_type(git_object *object)
{
int error;
if ((error = printf("%s\n", git_object_type2string(git_object_type(object)))) < 0)
fprintf(stderr, "%s: %s\n", PROGRAM_NAME, strerror(errno));
return error < 0 ? 1 : 0;
}
static int print_pretty(git_object *object)
{
const git_tree_entry *entry;
size_t i, count;
/*
* Only trees are stored in an unreadable format and benefit from
* pretty-printing.
*/
if (git_object_type(object) != GIT_OBJECT_TREE)
return print_odb(object, DISPLAY_CONTENT);
for (i = 0, count = git_tree_entrycount((git_tree *)object); i < count; i++) {
entry = git_tree_entry_byindex((git_tree *)object, i);
printf("%06o %s %s\t%s\n",
git_tree_entry_filemode_raw(entry),
git_object_type2string(git_tree_entry_type(entry)),
git_oid_tostr_s(git_tree_entry_id(entry)),
git_tree_entry_name(entry));
}
return 0;
}
int cmd_cat_file(int argc, char **argv)
{
git_repository *repo = NULL;
git_object *object = NULL;
git_object_t type;
cli_opt invalid_opt;
int error, ret = 1;
if (cli_opt_parse(&invalid_opt, opts, argv + 1, argc - 1)) {
cli_opt_status_fprint(stderr, &invalid_opt);
cli_opt_usage_fprint(stdout, PROGRAM_NAME, "cat-file", opts);
return 129;
}
if (show_help) {
print_help();
return 0;
}
/*
* Either the type may be explicitly specified, or a flag that
* indicates that the object's actual type is used, but not both.
*/
if (display != DISPLAY_CONTENT && type_name && object_spec) {
fprintf(stderr, "unknown option: %s\n", object_spec);
cli_opt_usage_fprint(stdout, PROGRAM_NAME, "cat-file", opts);
return 129;
}
if (display != DISPLAY_CONTENT) {
/* What we parsed as the type is the object. */
object_spec = type_name;
type_name = NULL;
}
if ((display == DISPLAY_CONTENT && !type_name) || !object_spec) {
cli_opt_usage_fprint(stdout, PROGRAM_NAME, "cat-file", opts);
return 129;
}
if (git_repository_open_ext(&repo, ".", GIT_REPOSITORY_OPEN_FROM_ENV, NULL) < 0) {
printf("%s: %s\n", PROGRAM_NAME, git_error_last()->message);
return 128;
}
if ((error = git_revparse_single(&object, repo, object_spec)) < 0) {
if (display == DISPLAY_EXISTS && error == GIT_ENOTFOUND) {
ret = 1;
} else {
printf("%s: %s\n", PROGRAM_NAME, git_error_last()->message);
ret = 128;
}
goto done;
}
if (type_name) {
git_object *peeled;
if ((type = git_object_string2type(type_name)) == GIT_OBJECT_INVALID) {
fprintf(stderr, "%s: invalid object type '%s'\n", PROGRAM_NAME, type_name);
return 129;
}
if (git_object_peel(&peeled, object, type) < 0) {
fprintf(stderr, "%s: %s\n", PROGRAM_NAME, git_error_last()->message);
goto done;
}
git_object_free(object);
object = peeled;
}
switch (display) {
case DISPLAY_EXISTS:
ret = 0;
break;
case DISPLAY_TYPE:
ret = print_type(object);
break;
case DISPLAY_PRETTY:
ret = print_pretty(object);
break;
default:
ret = print_odb(object, display);
break;
}
done:
git_object_free(object);
git_repository_free(repo);
return ret;
}
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