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git/builtin/hash-object.c

165 lines
4.4 KiB

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