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![Alexander Kuleshov](/assets/img/avatar_default.png)
In cat_one_file(), "type" and "size" variables are defined in the function scope, and then two variables of the same name are defined in a block in one of the if/else statement, hiding the definitions in the outer scope. Because the values of the outer variables before the control enters this scope, however, do not have to be preserved, we can remove useless definitions of variables from the inner scope safely without breaking anything. Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
414 lines
10 KiB
C
414 lines
10 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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*/
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#include "cache.h"
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#include "exec_cmd.h"
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#include "tag.h"
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#include "tree.h"
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#include "builtin.h"
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#include "parse-options.h"
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#include "diff.h"
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#include "userdiff.h"
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#include "streaming.h"
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static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
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{
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unsigned char sha1[20];
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enum object_type type;
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char *buf;
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unsigned long size;
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struct object_context obj_context;
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if (get_sha1_with_context(obj_name, 0, sha1, &obj_context))
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die("Not a valid object name %s", obj_name);
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buf = NULL;
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switch (opt) {
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case 't':
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type = sha1_object_info(sha1, NULL);
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if (type > 0) {
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printf("%s\n", typename(type));
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return 0;
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}
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break;
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case 's':
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type = sha1_object_info(sha1, &size);
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if (type > 0) {
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printf("%lu\n", size);
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return 0;
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}
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break;
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case 'e':
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return !has_sha1_file(sha1);
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case 'c':
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if (!obj_context.path[0])
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die("git cat-file --textconv %s: <object> must be <sha1:path>",
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obj_name);
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if (textconv_object(obj_context.path, obj_context.mode, sha1, 1, &buf, &size))
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break;
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case 'p':
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type = sha1_object_info(sha1, NULL);
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if (type < 0)
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die("Not a valid object name %s", obj_name);
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/* custom pretty-print here */
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if (type == OBJ_TREE) {
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const char *ls_args[3] = { NULL };
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ls_args[0] = "ls-tree";
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ls_args[1] = obj_name;
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return cmd_ls_tree(2, ls_args, NULL);
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}
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if (type == OBJ_BLOB)
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return stream_blob_to_fd(1, sha1, NULL, 0);
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buf = read_sha1_file(sha1, &type, &size);
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if (!buf)
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die("Cannot read object %s", obj_name);
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/* otherwise just spit out the data */
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break;
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case 0:
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if (type_from_string(exp_type) == OBJ_BLOB) {
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unsigned char blob_sha1[20];
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if (sha1_object_info(sha1, NULL) == OBJ_TAG) {
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char *buffer = read_sha1_file(sha1, &type, &size);
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const char *target;
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if (!skip_prefix(buffer, "object ", &target) ||
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get_sha1_hex(target, blob_sha1))
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die("%s not a valid tag", sha1_to_hex(sha1));
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free(buffer);
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} else
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hashcpy(blob_sha1, sha1);
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if (sha1_object_info(blob_sha1, NULL) == OBJ_BLOB)
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return stream_blob_to_fd(1, blob_sha1, NULL, 0);
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/*
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* we attempted to dereference a tag to a blob
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* and failed; there may be new dereference
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* mechanisms this code is not aware of.
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* fall-back to the usual case.
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*/
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}
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buf = read_object_with_reference(sha1, exp_type, &size, NULL);
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break;
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default:
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die("git cat-file: unknown option: %s", exp_type);
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}
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if (!buf)
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die("git cat-file %s: bad file", obj_name);
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write_or_die(1, buf, size);
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return 0;
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}
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struct expand_data {
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unsigned char sha1[20];
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enum object_type type;
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unsigned long size;
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unsigned long disk_size;
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const char *rest;
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unsigned char delta_base_sha1[20];
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/*
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* If mark_query is true, we do not expand anything, but rather
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* just mark the object_info with items we wish to query.
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*/
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int mark_query;
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/*
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* Whether to split the input on whitespace before feeding it to
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* get_sha1; this is decided during the mark_query phase based on
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* whether we have a %(rest) token in our format.
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*/
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int split_on_whitespace;
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/*
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* After a mark_query run, this object_info is set up to be
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* passed to sha1_object_info_extended. It will point to the data
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* elements above, so you can retrieve the response from there.
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*/
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struct object_info info;
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};
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static int is_atom(const char *atom, const char *s, int slen)
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{
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int alen = strlen(atom);
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return alen == slen && !memcmp(atom, s, alen);
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}
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static void expand_atom(struct strbuf *sb, const char *atom, int len,
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void *vdata)
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{
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struct expand_data *data = vdata;
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if (is_atom("objectname", atom, len)) {
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if (!data->mark_query)
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strbuf_addstr(sb, sha1_to_hex(data->sha1));
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} else if (is_atom("objecttype", atom, len)) {
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if (data->mark_query)
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data->info.typep = &data->type;
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else
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strbuf_addstr(sb, typename(data->type));
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} else if (is_atom("objectsize", atom, len)) {
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if (data->mark_query)
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data->info.sizep = &data->size;
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else
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strbuf_addf(sb, "%lu", data->size);
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} else if (is_atom("objectsize:disk", atom, len)) {
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if (data->mark_query)
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data->info.disk_sizep = &data->disk_size;
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else
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strbuf_addf(sb, "%lu", data->disk_size);
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} else if (is_atom("rest", atom, len)) {
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if (data->mark_query)
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data->split_on_whitespace = 1;
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else if (data->rest)
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strbuf_addstr(sb, data->rest);
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} else if (is_atom("deltabase", atom, len)) {
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if (data->mark_query)
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data->info.delta_base_sha1 = data->delta_base_sha1;
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else
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strbuf_addstr(sb, sha1_to_hex(data->delta_base_sha1));
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} else
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die("unknown format element: %.*s", len, atom);
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}
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static size_t expand_format(struct strbuf *sb, const char *start, void *data)
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{
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const char *end;
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if (*start != '(')
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return 0;
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end = strchr(start + 1, ')');
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if (!end)
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die("format element '%s' does not end in ')'", start);
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expand_atom(sb, start + 1, end - start - 1, data);
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return end - start + 1;
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}
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static void print_object_or_die(int fd, struct expand_data *data)
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{
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const unsigned char *sha1 = data->sha1;
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assert(data->info.typep);
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if (data->type == OBJ_BLOB) {
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if (stream_blob_to_fd(fd, sha1, NULL, 0) < 0)
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die("unable to stream %s to stdout", sha1_to_hex(sha1));
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}
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else {
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enum object_type type;
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unsigned long size;
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void *contents;
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contents = read_sha1_file(sha1, &type, &size);
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if (!contents)
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die("object %s disappeared", sha1_to_hex(sha1));
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if (type != data->type)
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die("object %s changed type!?", sha1_to_hex(sha1));
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if (data->info.sizep && size != data->size)
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die("object %s changed size!?", sha1_to_hex(sha1));
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write_or_die(fd, contents, size);
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free(contents);
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}
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}
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struct batch_options {
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int enabled;
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int print_contents;
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const char *format;
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};
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static int batch_one_object(const char *obj_name, struct batch_options *opt,
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struct expand_data *data)
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{
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struct strbuf buf = STRBUF_INIT;
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if (!obj_name)
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return 1;
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if (get_sha1(obj_name, data->sha1)) {
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printf("%s missing\n", obj_name);
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fflush(stdout);
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return 0;
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}
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if (sha1_object_info_extended(data->sha1, &data->info, LOOKUP_REPLACE_OBJECT) < 0) {
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printf("%s missing\n", obj_name);
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fflush(stdout);
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return 0;
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}
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strbuf_expand(&buf, opt->format, expand_format, data);
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strbuf_addch(&buf, '\n');
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write_or_die(1, buf.buf, buf.len);
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strbuf_release(&buf);
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if (opt->print_contents) {
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print_object_or_die(1, data);
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write_or_die(1, "\n", 1);
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}
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return 0;
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}
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static int batch_objects(struct batch_options *opt)
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{
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struct strbuf buf = STRBUF_INIT;
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struct expand_data data;
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int save_warning;
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int retval = 0;
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if (!opt->format)
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opt->format = "%(objectname) %(objecttype) %(objectsize)";
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/*
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* Expand once with our special mark_query flag, which will prime the
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* object_info to be handed to sha1_object_info_extended for each
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* object.
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*/
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memset(&data, 0, sizeof(data));
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data.mark_query = 1;
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strbuf_expand(&buf, opt->format, expand_format, &data);
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data.mark_query = 0;
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/*
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* If we are printing out the object, then always fill in the type,
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* since we will want to decide whether or not to stream.
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*/
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if (opt->print_contents)
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data.info.typep = &data.type;
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/*
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* We are going to call get_sha1 on a potentially very large number of
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* objects. In most large cases, these will be actual object sha1s. The
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* cost to double-check that each one is not also a ref (just so we can
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* warn) ends up dwarfing the actual cost of the object lookups
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* themselves. We can work around it by just turning off the warning.
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*/
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save_warning = warn_on_object_refname_ambiguity;
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warn_on_object_refname_ambiguity = 0;
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while (strbuf_getline(&buf, stdin, '\n') != EOF) {
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if (data.split_on_whitespace) {
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/*
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* Split at first whitespace, tying off the beginning
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* of the string and saving the remainder (or NULL) in
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* data.rest.
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*/
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char *p = strpbrk(buf.buf, " \t");
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if (p) {
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while (*p && strchr(" \t", *p))
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*p++ = '\0';
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}
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data.rest = p;
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}
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retval = batch_one_object(buf.buf, opt, &data);
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if (retval)
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break;
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}
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strbuf_release(&buf);
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warn_on_object_refname_ambiguity = save_warning;
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return retval;
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}
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static const char * const cat_file_usage[] = {
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N_("git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>"),
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N_("git cat-file (--batch|--batch-check) < <list_of_objects>"),
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NULL
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};
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static int git_cat_file_config(const char *var, const char *value, void *cb)
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{
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if (userdiff_config(var, value) < 0)
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return -1;
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return git_default_config(var, value, cb);
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}
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static int batch_option_callback(const struct option *opt,
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const char *arg,
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int unset)
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{
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struct batch_options *bo = opt->value;
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if (unset) {
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memset(bo, 0, sizeof(*bo));
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return 0;
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}
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bo->enabled = 1;
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bo->print_contents = !strcmp(opt->long_name, "batch");
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bo->format = arg;
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return 0;
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}
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int cmd_cat_file(int argc, const char **argv, const char *prefix)
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{
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int opt = 0;
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const char *exp_type = NULL, *obj_name = NULL;
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struct batch_options batch = {0};
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const struct option options[] = {
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OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
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OPT_SET_INT('t', NULL, &opt, N_("show object type"), 't'),
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OPT_SET_INT('s', NULL, &opt, N_("show object size"), 's'),
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OPT_SET_INT('e', NULL, &opt,
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N_("exit with zero when there's no error"), 'e'),
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OPT_SET_INT('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
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OPT_SET_INT(0, "textconv", &opt,
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N_("for blob objects, run textconv on object's content"), 'c'),
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{ OPTION_CALLBACK, 0, "batch", &batch, "format",
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N_("show info and content of objects fed from the standard input"),
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PARSE_OPT_OPTARG, batch_option_callback },
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{ OPTION_CALLBACK, 0, "batch-check", &batch, "format",
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N_("show info about objects fed from the standard input"),
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PARSE_OPT_OPTARG, batch_option_callback },
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OPT_END()
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};
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git_config(git_cat_file_config, NULL);
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if (argc != 3 && argc != 2)
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usage_with_options(cat_file_usage, options);
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argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
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if (opt) {
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if (argc == 1)
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obj_name = argv[0];
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else
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usage_with_options(cat_file_usage, options);
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}
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if (!opt && !batch.enabled) {
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if (argc == 2) {
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exp_type = argv[0];
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obj_name = argv[1];
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} else
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usage_with_options(cat_file_usage, options);
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}
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if (batch.enabled && (opt || argc)) {
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usage_with_options(cat_file_usage, options);
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}
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if (batch.enabled)
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return batch_objects(&batch);
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return cat_one_file(opt, exp_type, obj_name);
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}
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