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![Jeff King](/assets/img/avatar_default.png)
It can sometimes be useful to examine all objects in the repository. Normally this is done with "git rev-list --all --objects", but: 1. That shows only reachable objects. You may want to look at all available objects. 2. It's slow. We actually open each object to walk the graph. If your operation is OK with seeing unreachable objects, it's an order of magnitude faster to just enumerate the loose directories and pack indices. You can do this yourself using "ls" and "git show-index", but it's non-obvious. This patch adds an option to "cat-file --batch-check" to operate on all available objects (rather than reading names from stdin). This is based on a proposal by Charles Bailey to provide a separate "git list-all-objects" command. That is more orthogonal, as it splits enumerating the objects from getting information about them. However, in practice you will either: a. Feed the list of objects directly into cat-file anyway, so you can find out information about them. Keeping it in a single process is more efficient. b. Ask the listing process to start telling you more information about the objects, in which case you will reinvent cat-file's batch-check formatter. Adding a cat-file option is simple and efficient. And if you really do want just the object names, you can always do: git cat-file --batch-check='%(objectname)' --batch-all-objects Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
514 lines
13 KiB
C
514 lines
13 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 "builtin.h"
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#include "parse-options.h"
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#include "userdiff.h"
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#include "streaming.h"
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#include "tree-walk.h"
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struct batch_options {
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int enabled;
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int follow_symlinks;
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int print_contents;
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int buffer_output;
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int all_objects;
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const char *format;
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};
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static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
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int unknown_type)
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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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struct object_info oi = {NULL};
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struct strbuf sb = STRBUF_INIT;
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unsigned flags = LOOKUP_REPLACE_OBJECT;
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if (unknown_type)
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flags |= LOOKUP_UNKNOWN_OBJECT;
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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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oi.typename = &sb;
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if (sha1_object_info_extended(sha1, &oi, flags) < 0)
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die("git cat-file: could not get object info");
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if (sb.len) {
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printf("%s\n", sb.buf);
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strbuf_release(&sb);
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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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oi.sizep = &size;
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if (sha1_object_info_extended(sha1, &oi, flags) < 0)
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die("git cat-file: could not get object info");
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printf("%lu\n", size);
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return 0;
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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 batch_write(struct batch_options *opt, const void *data, int len)
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{
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if (opt->buffer_output) {
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if (fwrite(data, 1, len, stdout) != len)
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die_errno("unable to write to stdout");
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} else
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write_or_die(1, data, len);
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}
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static void print_object_or_die(struct batch_options *opt, 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 (opt->buffer_output)
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fflush(stdout);
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if (stream_blob_to_fd(1, 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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batch_write(opt, contents, size);
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free(contents);
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}
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}
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static void batch_object_write(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 (sha1_object_info_extended(data->sha1, &data->info, LOOKUP_REPLACE_OBJECT) < 0) {
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printf("%s missing\n", obj_name ? obj_name : sha1_to_hex(data->sha1));
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fflush(stdout);
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return;
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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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batch_write(opt, 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(opt, data);
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batch_write(opt, "\n", 1);
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}
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}
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static void 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 object_context ctx;
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int flags = opt->follow_symlinks ? GET_SHA1_FOLLOW_SYMLINKS : 0;
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enum follow_symlinks_result result;
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result = get_sha1_with_context(obj_name, flags, data->sha1, &ctx);
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if (result != FOUND) {
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switch (result) {
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case MISSING_OBJECT:
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printf("%s missing\n", obj_name);
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break;
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case DANGLING_SYMLINK:
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printf("dangling %"PRIuMAX"\n%s\n",
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(uintmax_t)strlen(obj_name), obj_name);
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break;
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case SYMLINK_LOOP:
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printf("loop %"PRIuMAX"\n%s\n",
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(uintmax_t)strlen(obj_name), obj_name);
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break;
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case NOT_DIR:
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printf("notdir %"PRIuMAX"\n%s\n",
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(uintmax_t)strlen(obj_name), obj_name);
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break;
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default:
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die("BUG: unknown get_sha1_with_context result %d\n",
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result);
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break;
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}
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fflush(stdout);
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return;
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}
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if (ctx.mode == 0) {
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printf("symlink %"PRIuMAX"\n%s\n",
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(uintmax_t)ctx.symlink_path.len,
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ctx.symlink_path.buf);
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fflush(stdout);
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return;
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}
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batch_object_write(obj_name, opt, data);
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}
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struct object_cb_data {
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struct batch_options *opt;
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struct expand_data *expand;
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};
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static int batch_object_cb(const unsigned char *sha1,
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struct object_cb_data *data)
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{
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hashcpy(data->expand->sha1, sha1);
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batch_object_write(NULL, data->opt, data->expand);
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return 0;
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}
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static int batch_loose_object(const unsigned char *sha1,
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const char *path,
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void *data)
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{
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return batch_object_cb(sha1, data);
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}
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static int batch_packed_object(const unsigned char *sha1,
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struct packed_git *pack,
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uint32_t pos,
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void *data)
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{
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return batch_object_cb(sha1, data);
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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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if (opt->all_objects) {
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struct object_cb_data cb;
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cb.opt = opt;
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cb.expand = &data;
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for_each_loose_object(batch_loose_object, &cb, 0);
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for_each_packed_object(batch_packed_object, &cb, 0);
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return 0;
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}
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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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batch_one_object(buf.buf, opt, &data);
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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 [--allow-unknown-type]|-s [--allow-unknown-type]|-e|-p|<type>|--textconv) <object>"),
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N_("git cat-file (--batch | --batch-check) [--follow-symlinks] < <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 (bo->enabled) {
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return 1;
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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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int unknown_type = 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_CMDMODE('t', NULL, &opt, N_("show object type"), 't'),
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OPT_CMDMODE('s', NULL, &opt, N_("show object size"), 's'),
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OPT_CMDMODE('e', NULL, &opt,
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N_("exit with zero when there's no error"), 'e'),
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OPT_CMDMODE('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
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OPT_CMDMODE(0, "textconv", &opt,
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N_("for blob objects, run textconv on object's content"), 'c'),
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OPT_BOOL(0, "allow-unknown-type", &unknown_type,
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N_("allow -s and -t to work with broken/corrupt objects")),
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OPT_BOOL(0, "buffer", &batch.buffer_output, N_("buffer --batch output")),
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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_BOOL(0, "follow-symlinks", &batch.follow_symlinks,
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N_("follow in-tree symlinks (used with --batch or --batch-check)")),
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OPT_BOOL(0, "batch-all-objects", &batch.all_objects,
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N_("show all objects with --batch or --batch-check")),
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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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argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
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|
|
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.follow_symlinks || batch.all_objects) && !batch.enabled) {
|
|
usage_with_options(cat_file_usage, options);
|
|
}
|
|
|
|
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);
|
|
}
|