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hash-object.c 
176 строк · 4.7 Кб
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/*
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 * GIT - The information manager from hell
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 *
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 * Copyright (C) Linus Torvalds, 2005
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 * Copyright (C) Junio C Hamano, 2005
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 */
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#include "builtin.h"
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#include "abspath.h"
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#include "config.h"
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#include "gettext.h"
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#include "hex.h"
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#include "object-file.h"
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#include "object-store-ll.h"
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#include "blob.h"
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#include "quote.h"
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#include "parse-options.h"
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#include "setup.h"
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#include "strbuf.h"
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#include "write-or-die.h"
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/*
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 * This is to create corrupt objects for debugging and as such it
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 * needs to bypass the data conversion performed by, and the type
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 * limitation imposed by, index_fd() and its callees.
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 */
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static int hash_literally(struct object_id *oid, int fd, const char *type, unsigned flags)
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{
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	struct strbuf buf = STRBUF_INIT;
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	int ret;
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	if (strbuf_read(&buf, fd, 4096) < 0)
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		ret = -1;
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	else
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		ret = write_object_file_literally(buf.buf, buf.len, type, oid,
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						 flags);
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	close(fd);
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	strbuf_release(&buf);
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	return ret;
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}
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static void hash_fd(int fd, const char *type, const char *path, unsigned flags,
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		    int literally)
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{
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	struct stat st;
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	struct object_id oid;
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	if (fstat(fd, &st) < 0 ||
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	    (literally
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	     ? hash_literally(&oid, fd, type, flags)
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	     : index_fd(the_repository->index, &oid, fd, &st,
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			type_from_string(type), path, flags)))
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		die((flags & HASH_WRITE_OBJECT)
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		    ? "Unable to add %s to database"
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		    : "Unable to hash %s", path);
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	printf("%s\n", oid_to_hex(&oid));
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	maybe_flush_or_die(stdout, "hash to stdout");
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}
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static void hash_object(const char *path, const char *type, const char *vpath,
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			unsigned flags, int literally)
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{
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	int fd;
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	fd = xopen(path, O_RDONLY);
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	hash_fd(fd, type, vpath, flags, literally);
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}
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static void hash_stdin_paths(const char *type, int no_filters, unsigned flags,
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			     int literally)
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{
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	struct strbuf buf = STRBUF_INIT;
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	struct strbuf unquoted = STRBUF_INIT;
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	while (strbuf_getline(&buf, stdin) != EOF) {
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		if (buf.buf[0] == '"') {
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			strbuf_reset(&unquoted);
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			if (unquote_c_style(&unquoted, buf.buf, NULL))
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				die("line is badly quoted");
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			strbuf_swap(&buf, &unquoted);
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		}
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		hash_object(buf.buf, type, no_filters ? NULL : buf.buf, flags,
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			    literally);
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	}
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	strbuf_release(&buf);
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	strbuf_release(&unquoted);
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}
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int cmd_hash_object(int argc, const char **argv, const char *prefix)
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{
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	static const char * const hash_object_usage[] = {
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		N_("git hash-object [-t <type>] [-w] [--path=<file> | --no-filters]\n"
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		   "                [--stdin [--literally]] [--] <file>..."),
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		N_("git hash-object [-t <type>] [-w] --stdin-paths [--no-filters]"),
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		NULL
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	};
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	const char *type = blob_type;
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	int hashstdin = 0;
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	int stdin_paths = 0;
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	int no_filters = 0;
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	int literally = 0;
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	int nongit = 0;
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	unsigned flags = HASH_FORMAT_CHECK;
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	const char *vpath = NULL;
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	char *vpath_free = NULL;
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	const struct option hash_object_options[] = {
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		OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
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		OPT_BIT('w', NULL, &flags, N_("write the object into the object database"),
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			HASH_WRITE_OBJECT),
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		OPT_COUNTUP( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
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		OPT_BOOL( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
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		OPT_BOOL( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
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		OPT_BOOL( 0, "literally", &literally, N_("just hash any random garbage to create corrupt objects for debugging Git")),
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		OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
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		OPT_END()
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	};
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	int i;
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	const char *errstr = NULL;
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	argc = parse_options(argc, argv, prefix, hash_object_options,
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			     hash_object_usage, 0);
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	if (flags & HASH_WRITE_OBJECT)
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		prefix = setup_git_directory();
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	else
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		prefix = setup_git_directory_gently(&nongit);
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	if (nongit && !the_hash_algo)
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		repo_set_hash_algo(the_repository, GIT_HASH_SHA1);
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	if (vpath && prefix) {
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		vpath_free = prefix_filename(prefix, vpath);
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		vpath = vpath_free;
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	}
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	git_config(git_default_config, NULL);
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	if (stdin_paths) {
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		if (hashstdin)
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			errstr = "Can't use --stdin-paths with --stdin";
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		else if (argc)
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			errstr = "Can't specify files with --stdin-paths";
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		else if (vpath)
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			errstr = "Can't use --stdin-paths with --path";
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	}
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	else {
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		if (hashstdin > 1)
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			errstr = "Multiple --stdin arguments are not supported";
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		if (vpath && no_filters)
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			errstr = "Can't use --path with --no-filters";
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	}
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	if (errstr) {
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		error("%s", errstr);
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		usage_with_options(hash_object_usage, hash_object_options);
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	}
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	if (hashstdin)
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		hash_fd(0, type, vpath, flags, literally);
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	for (i = 0 ; i < argc; i++) {
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		const char *arg = argv[i];
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		char *to_free = NULL;
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		if (prefix)
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			arg = to_free = prefix_filename(prefix, arg);
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		hash_object(arg, type, no_filters ? NULL : vpath ? vpath : arg,
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			    flags, literally);
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		free(to_free);
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	}
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	if (stdin_paths)
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		hash_stdin_paths(type, no_filters, flags, literally);
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	free(vpath_free);
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	return 0;
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}
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