diff options
Diffstat (limited to 'builtin/cat-file.c')
| -rw-r--r-- | builtin/cat-file.c | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/builtin/cat-file.c b/builtin/cat-file.c new file mode 100644 index 0000000000..707330499f --- /dev/null +++ b/builtin/cat-file.c @@ -0,0 +1,414 @@ +/* + * GIT - The information manager from hell + * + * Copyright (C) Linus Torvalds, 2005 + */ +#include "cache.h" +#include "exec_cmd.h" +#include "tag.h" +#include "tree.h" +#include "builtin.h" +#include "parse-options.h" +#include "diff.h" +#include "userdiff.h" +#include "streaming.h" + +static int cat_one_file(int opt, const char *exp_type, const char *obj_name) +{ + unsigned char sha1[20]; + enum object_type type; + char *buf; + unsigned long size; + struct object_context obj_context; + + if (get_sha1_with_context(obj_name, 0, sha1, &obj_context)) + die("Not a valid object name %s", obj_name); + + buf = NULL; + switch (opt) { + case 't': + type = sha1_object_info(sha1, NULL); + if (type > 0) { + printf("%s\n", typename(type)); + return 0; + } + break; + + case 's': + type = sha1_object_info(sha1, &size); + if (type > 0) { + printf("%lu\n", size); + return 0; + } + break; + + case 'e': + return !has_sha1_file(sha1); + + case 'c': + if (!obj_context.path[0]) + die("git cat-file --textconv %s: <object> must be <sha1:path>", + obj_name); + + if (textconv_object(obj_context.path, obj_context.mode, sha1, 1, &buf, &size)) + break; + + case 'p': + type = sha1_object_info(sha1, 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, sha1, NULL, 0); + buf = read_sha1_file(sha1, &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) { + unsigned char blob_sha1[20]; + if (sha1_object_info(sha1, NULL) == OBJ_TAG) { + enum object_type type; + unsigned long size; + char *buffer = read_sha1_file(sha1, &type, &size); + if (memcmp(buffer, "object ", 7) || + get_sha1_hex(buffer + 7, blob_sha1)) + die("%s not a valid tag", sha1_to_hex(sha1)); + free(buffer); + } else + hashcpy(blob_sha1, sha1); + + if (sha1_object_info(blob_sha1, NULL) == OBJ_BLOB) + return stream_blob_to_fd(1, blob_sha1, 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(sha1, 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); + return 0; +} + +struct expand_data { + unsigned char sha1[20]; + enum object_type type; + unsigned long size; + unsigned long disk_size; + const char *rest; + unsigned char delta_base_sha1[20]; + + /* + * 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; +}; + +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, sha1_to_hex(data->sha1)); + } 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, "%lu", 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_sha1; + else + strbuf_addstr(sb, sha1_to_hex(data->delta_base_sha1)); + } 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 print_object_or_die(int fd, struct expand_data *data) +{ + const unsigned char *sha1 = data->sha1; + + assert(data->info.typep); + + if (data->type == OBJ_BLOB) { + if (stream_blob_to_fd(fd, sha1, NULL, 0) < 0) + die("unable to stream %s to stdout", sha1_to_hex(sha1)); + } + else { + enum object_type type; + unsigned long size; + void *contents; + + contents = read_sha1_file(sha1, &type, &size); + if (!contents) + die("object %s disappeared", sha1_to_hex(sha1)); + if (type != data->type) + die("object %s changed type!?", sha1_to_hex(sha1)); + if (data->info.sizep && size != data->size) + die("object %s changed size!?", sha1_to_hex(sha1)); + + write_or_die(fd, contents, size); + free(contents); + } +} + +struct batch_options { + int enabled; + int print_contents; + const char *format; +}; + +static int batch_one_object(const char *obj_name, struct batch_options *opt, + struct expand_data *data) +{ + struct strbuf buf = STRBUF_INIT; + + if (!obj_name) + return 1; + + if (get_sha1(obj_name, data->sha1)) { + printf("%s missing\n", obj_name); + fflush(stdout); + return 0; + } + + if (sha1_object_info_extended(data->sha1, &data->info, LOOKUP_REPLACE_OBJECT) < 0) { + printf("%s missing\n", obj_name); + fflush(stdout); + return 0; + } + + strbuf_expand(&buf, opt->format, expand_format, data); + strbuf_addch(&buf, '\n'); + write_or_die(1, buf.buf, buf.len); + strbuf_release(&buf); + + if (opt->print_contents) { + print_object_or_die(1, data); + write_or_die(1, "\n", 1); + } + 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 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; + + /* + * 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, '\n') != 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; + } + + retval = batch_one_object(buf.buf, opt, &data); + if (retval) + break; + } + + strbuf_release(&buf); + warn_on_object_refname_ambiguity = save_warning; + return retval; +} + +static const char * const cat_file_usage[] = { + N_("git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>"), + N_("git cat-file (--batch|--batch-check) < <list_of_objects>"), + 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 (unset) { + memset(bo, 0, sizeof(*bo)); + return 0; + } + + 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}; + + const struct option options[] = { + OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")), + OPT_SET_INT('t', NULL, &opt, N_("show object type"), 't'), + OPT_SET_INT('s', NULL, &opt, N_("show object size"), 's'), + OPT_SET_INT('e', NULL, &opt, + N_("exit with zero when there's no error"), 'e'), + OPT_SET_INT('p', NULL, &opt, N_("pretty-print object's content"), 'p'), + OPT_SET_INT(0, "textconv", &opt, + N_("for blob objects, run textconv on object's content"), 'c'), + { 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_END() + }; + + git_config(git_cat_file_config, NULL); + + if (argc != 3 && argc != 2) + usage_with_options(cat_file_usage, options); + + argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0); + + if (opt) { + 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 && (opt || argc)) { + usage_with_options(cat_file_usage, options); + } + + if (batch.enabled) + return batch_objects(&batch); + + return cat_one_file(opt, exp_type, obj_name); +} |