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![Jeff King](/assets/img/avatar_default.png)
We use the "buf" strbuf for two things: to read incoming lines, and as a scratch space for test-expanding the user-provided format. Let's split this into two variables with descriptive names, which makes their purpose and lifetime more clear. It will also help in a future patch when we start using the "output" buffer for more expansions. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
691 lines
18 KiB
C
691 lines
18 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 "config.h"
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#include "builtin.h"
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#include "diff.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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#include "sha1-array.h"
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#include "packfile.h"
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#include "object-store.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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int unordered;
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int cmdmode; /* may be 'w' or 'c' for --filters or --textconv */
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const char *format;
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};
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static const char *force_path;
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static int filter_object(const char *path, unsigned mode,
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const struct object_id *oid,
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char **buf, unsigned long *size)
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{
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enum object_type type;
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*buf = read_object_file(oid, &type, size);
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if (!*buf)
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return error(_("cannot read object %s '%s'"),
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oid_to_hex(oid), path);
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if ((type == OBJ_BLOB) && S_ISREG(mode)) {
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struct strbuf strbuf = STRBUF_INIT;
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if (convert_to_working_tree(path, *buf, *size, &strbuf)) {
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free(*buf);
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*size = strbuf.len;
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*buf = strbuf_detach(&strbuf, NULL);
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}
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}
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return 0;
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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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struct object_id oid;
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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 = OBJECT_INFO_INIT;
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struct strbuf sb = STRBUF_INIT;
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unsigned flags = OBJECT_INFO_LOOKUP_REPLACE;
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const char *path = force_path;
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if (unknown_type)
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flags |= OBJECT_INFO_ALLOW_UNKNOWN_TYPE;
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if (get_oid_with_context(obj_name, GET_OID_RECORD_PATH,
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&oid, &obj_context))
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die("Not a valid object name %s", obj_name);
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if (!path)
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path = obj_context.path;
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if (obj_context.mode == S_IFINVALID)
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obj_context.mode = 0100644;
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buf = NULL;
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switch (opt) {
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case 't':
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oi.type_name = &sb;
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if (oid_object_info_extended(the_repository, &oid, &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 (oid_object_info_extended(the_repository, &oid, &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_object_file(&oid);
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case 'w':
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if (!path)
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die("git cat-file --filters %s: <object> must be "
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"<sha1:path>", obj_name);
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if (filter_object(path, obj_context.mode,
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&oid, &buf, &size))
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return -1;
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break;
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case 'c':
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if (!path)
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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(path, obj_context.mode, &oid, 1, &buf, &size))
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break;
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/* else fallthrough */
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case 'p':
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type = oid_object_info(the_repository, &oid, 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, &oid, NULL, 0);
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buf = read_object_file(&oid, &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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struct object_id blob_oid;
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if (oid_object_info(the_repository, &oid, NULL) == OBJ_TAG) {
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char *buffer = read_object_file(&oid, &type,
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&size);
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const char *target;
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if (!skip_prefix(buffer, "object ", &target) ||
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get_oid_hex(target, &blob_oid))
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die("%s not a valid tag", oid_to_hex(&oid));
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free(buffer);
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} else
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oidcpy(&blob_oid, &oid);
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if (oid_object_info(the_repository, &blob_oid, NULL) == OBJ_BLOB)
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return stream_blob_to_fd(1, &blob_oid, 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(&oid, 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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free(buf);
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free(obj_context.path);
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return 0;
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}
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struct expand_data {
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struct object_id oid;
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enum object_type type;
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unsigned long size;
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off_t disk_size;
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const char *rest;
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struct object_id delta_base_oid;
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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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* This flag will be true if the requested batch format and options
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* don't require us to call sha1_object_info, which can then be
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* optimized out.
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*/
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unsigned skip_object_info : 1;
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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, oid_to_hex(&data->oid));
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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, type_name(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, "%"PRIuMAX, (uintmax_t)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_oid.hash;
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else
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strbuf_addstr(sb,
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oid_to_hex(&data->delta_base_oid));
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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 struct object_id *oid = &data->oid;
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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 (opt->cmdmode) {
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char *contents;
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unsigned long size;
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if (!data->rest)
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die("missing path for '%s'", oid_to_hex(oid));
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if (opt->cmdmode == 'w') {
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if (filter_object(data->rest, 0100644, oid,
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&contents, &size))
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die("could not convert '%s' %s",
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oid_to_hex(oid), data->rest);
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} else if (opt->cmdmode == 'c') {
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enum object_type type;
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if (!textconv_object(data->rest, 0100644, oid,
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1, &contents, &size))
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contents = read_object_file(oid,
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&type,
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&size);
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if (!contents)
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die("could not convert '%s' %s",
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oid_to_hex(oid), data->rest);
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} else
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BUG("invalid cmdmode: %c", opt->cmdmode);
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batch_write(opt, contents, size);
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free(contents);
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} else if (stream_blob_to_fd(1, oid, NULL, 0) < 0)
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die("unable to stream %s to stdout", oid_to_hex(oid));
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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_object_file(oid, &type, &size);
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if (!contents)
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die("object %s disappeared", oid_to_hex(oid));
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if (type != data->type)
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die("object %s changed type!?", oid_to_hex(oid));
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if (data->info.sizep && size != data->size)
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die("object %s changed size!?", oid_to_hex(oid));
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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 (!data->skip_object_info &&
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oid_object_info_extended(the_repository, &data->oid, &data->info,
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OBJECT_INFO_LOOKUP_REPLACE) < 0) {
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printf("%s missing\n",
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obj_name ? obj_name : oid_to_hex(&data->oid));
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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_OID_FOLLOW_SYMLINKS : 0;
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enum follow_symlinks_result result;
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result = get_oid_with_context(obj_name, flags, &data->oid, &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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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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struct oidset *seen;
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};
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static int batch_object_cb(const struct object_id *oid, void *vdata)
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{
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struct object_cb_data *data = vdata;
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oidcpy(&data->expand->oid, oid);
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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 collect_loose_object(const struct object_id *oid,
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const char *path,
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void *data)
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{
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oid_array_append(data, oid);
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return 0;
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}
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static int collect_packed_object(const struct object_id *oid,
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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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oid_array_append(data, oid);
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return 0;
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}
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static int batch_unordered_object(const struct object_id *oid, void *vdata)
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{
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struct object_cb_data *data = vdata;
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if (oidset_insert(data->seen, oid))
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return 0;
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return batch_object_cb(oid, data);
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}
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static int batch_unordered_loose(const struct object_id *oid,
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const char *path,
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void *data)
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{
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return batch_unordered_object(oid, data);
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}
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static int batch_unordered_packed(const struct object_id *oid,
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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_unordered_object(oid, 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 input = STRBUF_INIT;
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struct strbuf output = 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(&output, opt->format, expand_format, &data);
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data.mark_query = 0;
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strbuf_release(&output);
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if (opt->cmdmode)
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data.split_on_whitespace = 1;
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if (opt->all_objects) {
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struct object_info empty = OBJECT_INFO_INIT;
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if (!memcmp(&data.info, &empty, sizeof(empty)))
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data.skip_object_info = 1;
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}
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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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if (repository_format_partial_clone)
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warning("This repository has extensions.partialClone set. Some objects may not be loaded.");
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cb.opt = opt;
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cb.expand = &data;
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if (opt->unordered) {
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struct oidset seen = OIDSET_INIT;
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cb.seen = &seen;
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for_each_loose_object(batch_unordered_loose, &cb, 0);
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for_each_packed_object(batch_unordered_packed, &cb,
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|
FOR_EACH_OBJECT_PACK_ORDER);
|
|
|
|
oidset_clear(&seen);
|
|
} else {
|
|
struct oid_array sa = OID_ARRAY_INIT;
|
|
|
|
for_each_loose_object(collect_loose_object, &sa, 0);
|
|
for_each_packed_object(collect_packed_object, &sa, 0);
|
|
|
|
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(&input, 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(input.buf, " \t");
|
|
if (p) {
|
|
while (*p && strchr(" \t", *p))
|
|
*p++ = '\0';
|
|
}
|
|
data.rest = p;
|
|
}
|
|
|
|
batch_one_object(input.buf, opt, &data);
|
|
}
|
|
|
|
strbuf_release(&input);
|
|
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_BOOL(0, "unordered", &batch.unordered,
|
|
N_("do not order --batch-all-objects output")),
|
|
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);
|
|
}
|