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![Junio C Hamano](/assets/img/avatar_default.png)
This allows "hash-object --stdin" to just hash any garbage into a "loose object" that may not pass the standard object parsing check or fsck, so that different kind of corrupt objects we may encounter in the field can be imitated in our test suite. That would in turn allow us to test features that catch these corrupt objects. Note that "cat-file" may need to learn "--literally" option to allow us peek into a truly broken object. Signed-off-by: Junio C Hamano <gitster@pobox.com>
157 lines
4.4 KiB
C
157 lines
4.4 KiB
C
/*
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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 "blob.h"
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#include "quote.h"
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#include "parse-options.h"
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#include "exec_cmd.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(unsigned char *sha1, 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 if (flags & HASH_WRITE_OBJECT)
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ret = write_sha1_file(buf.buf, buf.len, type, sha1);
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else
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ret = hash_sha1_file(buf.buf, buf.len, type, sha1);
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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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unsigned char sha1[20];
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if (fstat(fd, &st) < 0 ||
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(literally
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? hash_literally(sha1, fd, type, flags)
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: index_fd(sha1, fd, &st, 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", sha1_to_hex(sha1));
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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 = open(path, O_RDONLY);
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if (fd < 0)
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die_errno("Cannot open '%s'", path);
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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, nbuf = STRBUF_INIT;
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while (strbuf_getline(&buf, stdin, '\n') != EOF) {
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if (buf.buf[0] == '"') {
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strbuf_reset(&nbuf);
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if (unquote_c_style(&nbuf, buf.buf, NULL))
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die("line is badly quoted");
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strbuf_swap(&buf, &nbuf);
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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(&nbuf);
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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] [--stdin] [--] <file>..."),
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N_("git hash-object --stdin-paths < <list-of-paths>"),
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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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unsigned flags = HASH_FORMAT_CHECK;
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const char *vpath = 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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int prefix_length = -1;
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const char *errstr = NULL;
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argc = parse_options(argc, argv, NULL, 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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prefix_length = prefix ? strlen(prefix) : 0;
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if (vpath && prefix)
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vpath = prefix_filename(prefix, prefix_length, vpath);
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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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if (0 <= prefix_length)
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arg = prefix_filename(prefix, prefix_length, 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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}
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if (stdin_paths)
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hash_stdin_paths(type, no_filters, flags, literally);
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return 0;
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}
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