/* * GIT - The information manager from hell * * Copyright (C) Linus Torvalds, 2005 */ #include "cache.h" #include "builtin.h" #include "parse-options.h" #include "userdiff.h" #include "streaming.h" #include "tree-walk.h" #include "sha1-array.h" struct batch_options { int enabled; int follow_symlinks; int print_contents; int buffer_output; int all_objects; int cmdmode; /* may be 'w' or 'c' for --filters or --textconv */ const char *format; }; static const char *force_path; static int filter_object(const char *path, unsigned mode, const struct object_id *oid, char **buf, unsigned long *size) { enum object_type type; *buf = read_sha1_file(oid->hash, &type, size); if (!*buf) return error(_("cannot read object %s '%s'"), oid_to_hex(oid), path); if ((type == OBJ_BLOB) && S_ISREG(mode)) { struct strbuf strbuf = STRBUF_INIT; if (convert_to_working_tree(path, *buf, *size, &strbuf)) { free(*buf); *size = strbuf.len; *buf = strbuf_detach(&strbuf, NULL); } } return 0; } static int cat_one_file(int opt, const char *exp_type, const char *obj_name, int unknown_type) { struct object_id oid; enum object_type type; char *buf; unsigned long size; struct object_context obj_context; struct object_info oi = OBJECT_INFO_INIT; struct strbuf sb = STRBUF_INIT; unsigned flags = LOOKUP_REPLACE_OBJECT; const char *path = force_path; if (unknown_type) flags |= LOOKUP_UNKNOWN_OBJECT; if (get_sha1_with_context(obj_name, 0, oid.hash, &obj_context)) die("Not a valid object name %s", obj_name); if (!path) path = obj_context.path; if (obj_context.mode == S_IFINVALID) obj_context.mode = 0100644; buf = NULL; switch (opt) { case 't': oi.typename = &sb; if (sha1_object_info_extended(oid.hash, &oi, flags) < 0) die("git cat-file: could not get object info"); if (sb.len) { printf("%s\n", sb.buf); strbuf_release(&sb); return 0; } break; case 's': oi.sizep = &size; if (sha1_object_info_extended(oid.hash, &oi, flags) < 0) die("git cat-file: could not get object info"); printf("%lu\n", size); return 0; case 'e': return !has_object_file(&oid); case 'w': if (!path[0]) die("git cat-file --filters %s: <object> must be " "<sha1:path>", obj_name); if (filter_object(path, obj_context.mode, &oid, &buf, &size)) return -1; break; case 'c': if (!path[0]) die("git cat-file --textconv %s: <object> must be <sha1:path>", obj_name); if (textconv_object(path, obj_context.mode, &oid, 1, &buf, &size)) break; case 'p': type = sha1_object_info(oid.hash, 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, &oid, NULL, 0); buf = read_sha1_file(oid.hash, &type, &size); if (!buf) die("Cannot read object %s", obj_name); /* otherwise just spit out the data */ break; case 0: if (type_from_string(exp_type) == OBJ_BLOB) { struct object_id blob_oid; if (sha1_object_info(oid.hash, NULL) == OBJ_TAG) { char *buffer = read_sha1_file(oid.hash, &type, &size); const char *target; if (!skip_prefix(buffer, "object ", &target) || get_oid_hex(target, &blob_oid)) die("%s not a valid tag", oid_to_hex(&oid)); free(buffer); } else oidcpy(&blob_oid, &oid); if (sha1_object_info(blob_oid.hash, NULL) == OBJ_BLOB) return stream_blob_to_fd(1, &blob_oid, 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(oid.hash, 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); free(buf); return 0; } struct expand_data { struct object_id oid; enum object_type type; unsigned long size; off_t disk_size; const char *rest; struct object_id delta_base_oid; /* * 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; /* * Whether to split the input on whitespace before feeding it to * get_sha1; this is decided during the mark_query phase based on * whether we have a %(rest) token in our format. */ int split_on_whitespace; /* * 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; /* * This flag will be true if the requested batch format and options * don't require us to call sha1_object_info, which can then be * optimized out. */ unsigned skip_object_info : 1; }; 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, oid_to_hex(&data->oid)); } 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, "%"PRIuMAX, (uintmax_t)data->disk_size); } else if (is_atom("rest", atom, len)) { if (data->mark_query) data->split_on_whitespace = 1; else if (data->rest) strbuf_addstr(sb, data->rest); } else if (is_atom("deltabase", atom, len)) { if (data->mark_query) data->info.delta_base_sha1 = data->delta_base_oid.hash; else strbuf_addstr(sb, oid_to_hex(&data->delta_base_oid)); } 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 batch_write(struct batch_options *opt, const void *data, int len) { if (opt->buffer_output) { if (fwrite(data, 1, len, stdout) != len) die_errno("unable to write to stdout"); } else write_or_die(1, data, len); } static void print_object_or_die(struct batch_options *opt, struct expand_data *data) { const struct object_id *oid = &data->oid; assert(data->info.typep); if (data->type == OBJ_BLOB) { if (opt->buffer_output) fflush(stdout); if (opt->cmdmode) { char *contents; unsigned long size; if (!data->rest) die("missing path for '%s'", oid_to_hex(oid)); if (opt->cmdmode == 'w') { if (filter_object(data->rest, 0100644, oid, &contents, &size)) die("could not convert '%s' %s", oid_to_hex(oid), data->rest); } else if (opt->cmdmode == 'c') { enum object_type type; if (!textconv_object(data->rest, 0100644, oid, 1, &contents, &size)) contents = read_sha1_file(oid->hash, &type, &size); if (!contents) die("could not convert '%s' %s", oid_to_hex(oid), data->rest); } else die("BUG: invalid cmdmode: %c", opt->cmdmode); batch_write(opt, contents, size); free(contents); } else if (stream_blob_to_fd(1, oid, NULL, 0) < 0) die("unable to stream %s to stdout", oid_to_hex(oid)); } else { enum object_type type; unsigned long size; void *contents; contents = read_sha1_file(oid->hash, &type, &size); if (!contents) die("object %s disappeared", oid_to_hex(oid)); if (type != data->type) die("object %s changed type!?", oid_to_hex(oid)); if (data->info.sizep && size != data->size) die("object %s changed size!?", oid_to_hex(oid)); batch_write(opt, contents, size); free(contents); } } static void batch_object_write(const char *obj_name, struct batch_options *opt, struct expand_data *data) { struct strbuf buf = STRBUF_INIT; if (!data->skip_object_info && sha1_object_info_extended(data->oid.hash, &data->info, LOOKUP_REPLACE_OBJECT) < 0) { printf("%s missing\n", obj_name ? obj_name : oid_to_hex(&data->oid)); fflush(stdout); return; } strbuf_expand(&buf, opt->format, expand_format, data); strbuf_addch(&buf, '\n'); batch_write(opt, buf.buf, buf.len); strbuf_release(&buf); if (opt->print_contents) { print_object_or_die(opt, data); batch_write(opt, "\n", 1); } } static void batch_one_object(const char *obj_name, struct batch_options *opt, struct expand_data *data) { struct object_context ctx; int flags = opt->follow_symlinks ? GET_SHA1_FOLLOW_SYMLINKS : 0; enum follow_symlinks_result result; result = get_sha1_with_context(obj_name, flags, data->oid.hash, &ctx); if (result != FOUND) { switch (result) { case MISSING_OBJECT: printf("%s missing\n", obj_name); break; case DANGLING_SYMLINK: printf("dangling %"PRIuMAX"\n%s\n", (uintmax_t)strlen(obj_name), obj_name); break; case SYMLINK_LOOP: printf("loop %"PRIuMAX"\n%s\n", (uintmax_t)strlen(obj_name), obj_name); break; case NOT_DIR: printf("notdir %"PRIuMAX"\n%s\n", (uintmax_t)strlen(obj_name), obj_name); break; default: die("BUG: unknown get_sha1_with_context result %d\n", result); break; } fflush(stdout); return; } if (ctx.mode == 0) { printf("symlink %"PRIuMAX"\n%s\n", (uintmax_t)ctx.symlink_path.len, ctx.symlink_path.buf); fflush(stdout); return; } batch_object_write(obj_name, opt, data); } struct object_cb_data { struct batch_options *opt; struct expand_data *expand; }; static int batch_object_cb(const struct object_id *oid, void *vdata) { struct object_cb_data *data = vdata; oidcpy(&data->expand->oid, oid); batch_object_write(NULL, data->opt, data->expand); return 0; } static int batch_loose_object(const struct object_id *oid, const char *path, void *data) { oid_array_append(data, oid); return 0; } static int batch_packed_object(const struct object_id *oid, struct packed_git *pack, uint32_t pos, void *data) { oid_array_append(data, oid); return 0; } static int batch_objects(struct batch_options *opt) { struct strbuf buf = STRBUF_INIT; struct expand_data data; int save_warning; int retval = 0; 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; if (opt->cmdmode) data.split_on_whitespace = 1; if (opt->all_objects) { struct object_info empty = OBJECT_INFO_INIT; if (!memcmp(&data.info, &empty, sizeof(empty))) data.skip_object_info = 1; } /* * If we are printing out the object, then always fill in the type, * since we will want to decide whether or not to stream. */ if (opt->print_contents) data.info.typep = &data.type; if (opt->all_objects) { struct oid_array sa = OID_ARRAY_INIT; struct object_cb_data cb; for_each_loose_object(batch_loose_object, &sa, 0); for_each_packed_object(batch_packed_object, &sa, 0); cb.opt = opt; cb.expand = &data; oid_array_for_each_unique(&sa, batch_object_cb, &cb); oid_array_clear(&sa); return 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. */ save_warning = warn_on_object_refname_ambiguity; warn_on_object_refname_ambiguity = 0; while (strbuf_getline(&buf, stdin) != EOF) { if (data.split_on_whitespace) { /* * Split at first whitespace, tying off the beginning * of the string and saving the remainder (or NULL) in * data.rest. */ char *p = strpbrk(buf.buf, " \t"); if (p) { while (*p && strchr(" \t", *p)) *p++ = '\0'; } data.rest = p; } batch_one_object(buf.buf, opt, &data); } strbuf_release(&buf); warn_on_object_refname_ambiguity = save_warning; return retval; } static const char * const cat_file_usage[] = { N_("git cat-file (-t [--allow-unknown-type] | -s [--allow-unknown-type] | -e | -p | <type> | --textconv | --filters) [--path=<path>] <object>"), N_("git cat-file (--batch | --batch-check) [--follow-symlinks] [--textconv | --filters]"), 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 (bo->enabled) { return 1; } 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}; int unknown_type = 0; const struct option options[] = { OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")), OPT_CMDMODE('t', NULL, &opt, N_("show object type"), 't'), OPT_CMDMODE('s', NULL, &opt, N_("show object size"), 's'), OPT_CMDMODE('e', NULL, &opt, N_("exit with zero when there's no error"), 'e'), OPT_CMDMODE('p', NULL, &opt, N_("pretty-print object's content"), 'p'), OPT_CMDMODE(0, "textconv", &opt, N_("for blob objects, run textconv on object's content"), 'c'), OPT_CMDMODE(0, "filters", &opt, N_("for blob objects, run filters on object's content"), 'w'), OPT_STRING(0, "path", &force_path, N_("blob"), N_("use a specific path for --textconv/--filters")), OPT_BOOL(0, "allow-unknown-type", &unknown_type, N_("allow -s and -t to work with broken/corrupt objects")), OPT_BOOL(0, "buffer", &batch.buffer_output, N_("buffer --batch output")), { 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_BOOL(0, "follow-symlinks", &batch.follow_symlinks, N_("follow in-tree symlinks (used with --batch or --batch-check)")), OPT_BOOL(0, "batch-all-objects", &batch.all_objects, N_("show all objects with --batch or --batch-check")), OPT_END() }; git_config(git_cat_file_config, NULL); batch.buffer_output = -1; argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0); if (opt) { if (batch.enabled && (opt == 'c' || opt == 'w')) batch.cmdmode = opt; else 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) { if (batch.cmdmode != opt || argc) usage_with_options(cat_file_usage, options); if (batch.cmdmode && batch.all_objects) die("--batch-all-objects cannot be combined with " "--textconv nor with --filters"); } if ((batch.follow_symlinks || batch.all_objects) && !batch.enabled) { usage_with_options(cat_file_usage, options); } if (force_path && opt != 'c' && opt != 'w') { error("--path=<path> needs --textconv or --filters"); usage_with_options(cat_file_usage, options); } if (force_path && batch.enabled) { error("--path=<path> incompatible with --batch"); usage_with_options(cat_file_usage, options); } if (batch.buffer_output < 0) batch.buffer_output = batch.all_objects; if (batch.enabled) return batch_objects(&batch); if (unknown_type && opt != 't' && opt != 's') die("git cat-file --allow-unknown-type: use with -s or -t"); return cat_one_file(opt, exp_type, obj_name, unknown_type); }