diff options
Diffstat (limited to 'builtin/cat-file.c')
| -rw-r--r-- | builtin/cat-file.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/builtin/cat-file.c b/builtin/cat-file.c new file mode 100644 index 0000000000..045cee7bce --- /dev/null +++ b/builtin/cat-file.c @@ -0,0 +1,240 @@ +/* + * GIT - The information manager from hell + * + * Copyright (C) Linus Torvalds, 2005 + */ +#include "cache.h" +#include "exec_cmd.h" +#include "tag.h" +#include "tree.h" +#include "builtin.h" +#include "parse-options.h" +#include "diff.h" +#include "userdiff.h" +#include "streaming.h" + +#define BATCH 1 +#define BATCH_CHECK 2 + +static int cat_one_file(int opt, const char *exp_type, const char *obj_name) +{ + unsigned char sha1[20]; + enum object_type type; + char *buf; + unsigned long size; + struct object_context obj_context; + + if (get_sha1_with_context(obj_name, 0, sha1, &obj_context)) + die("Not a valid object name %s", obj_name); + + buf = NULL; + switch (opt) { + case 't': + type = sha1_object_info(sha1, NULL); + if (type > 0) { + printf("%s\n", typename(type)); + return 0; + } + break; + + case 's': + type = sha1_object_info(sha1, &size); + if (type > 0) { + printf("%lu\n", size); + return 0; + } + break; + + case 'e': + return !has_sha1_file(sha1); + + case 'p': + type = sha1_object_info(sha1, NULL); + if (type < 0) + die("Not a valid object name %s", obj_name); + + /* custom pretty-print here */ + if (type == OBJ_TREE) { + const char *ls_args[3] = { NULL }; + ls_args[0] = "ls-tree"; + ls_args[1] = obj_name; + return cmd_ls_tree(2, ls_args, NULL); + } + + if (type == OBJ_BLOB) + return stream_blob_to_fd(1, sha1, NULL, 0); + buf = read_sha1_file(sha1, &type, &size); + if (!buf) + die("Cannot read object %s", obj_name); + + /* otherwise just spit out the data */ + break; + + case 'c': + if (!obj_context.path[0]) + die("git cat-file --textconv %s: <object> must be <sha1:path>", + obj_name); + + if (!textconv_object(obj_context.path, obj_context.mode, sha1, 1, &buf, &size)) + die("git cat-file --textconv: unable to run textconv on %s", + obj_name); + break; + + case 0: + if (type_from_string(exp_type) == OBJ_BLOB) { + unsigned char blob_sha1[20]; + if (sha1_object_info(sha1, NULL) == OBJ_TAG) { + enum object_type type; + unsigned long size; + char *buffer = read_sha1_file(sha1, &type, &size); + if (memcmp(buffer, "object ", 7) || + get_sha1_hex(buffer + 7, blob_sha1)) + die("%s not a valid tag", sha1_to_hex(sha1)); + free(buffer); + } else + hashcpy(blob_sha1, sha1); + + if (sha1_object_info(blob_sha1, NULL) == OBJ_BLOB) + return stream_blob_to_fd(1, blob_sha1, NULL, 0); + /* + * we attempted to dereference a tag to a blob + * and failed; there may be new dereference + * mechanisms this code is not aware of. + * fall-back to the usual case. + */ + } + buf = read_object_with_reference(sha1, exp_type, &size, NULL); + break; + + default: + die("git cat-file: unknown option: %s", exp_type); + } + + if (!buf) + die("git cat-file %s: bad file", obj_name); + + write_or_die(1, buf, size); + return 0; +} + +static int batch_one_object(const char *obj_name, int print_contents) +{ + unsigned char sha1[20]; + enum object_type type = 0; + unsigned long size; + void *contents = NULL; + + if (!obj_name) + return 1; + + if (get_sha1(obj_name, sha1)) { + printf("%s missing\n", obj_name); + fflush(stdout); + return 0; + } + + if (print_contents == BATCH) + contents = read_sha1_file(sha1, &type, &size); + else + type = sha1_object_info(sha1, &size); + + if (type <= 0) { + printf("%s missing\n", obj_name); + fflush(stdout); + if (print_contents == BATCH) + free(contents); + return 0; + } + + printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size); + fflush(stdout); + + if (print_contents == BATCH) { + write_or_die(1, contents, size); + printf("\n"); + fflush(stdout); + free(contents); + } + + return 0; +} + +static int batch_objects(int print_contents) +{ + struct strbuf buf = STRBUF_INIT; + + while (strbuf_getline(&buf, stdin, '\n') != EOF) { + int error = batch_one_object(buf.buf, print_contents); + if (error) + return error; + } + + return 0; +} + +static const char * const cat_file_usage[] = { + N_("git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>"), + N_("git cat-file (--batch|--batch-check) < <list_of_objects>"), + NULL +}; + +static int git_cat_file_config(const char *var, const char *value, void *cb) +{ + if (userdiff_config(var, value) < 0) + return -1; + + return git_default_config(var, value, cb); +} + +int cmd_cat_file(int argc, const char **argv, const char *prefix) +{ + int opt = 0, batch = 0; + const char *exp_type = NULL, *obj_name = NULL; + + const struct option options[] = { + OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")), + OPT_SET_INT('t', NULL, &opt, N_("show object type"), 't'), + OPT_SET_INT('s', NULL, &opt, N_("show object size"), 's'), + OPT_SET_INT('e', NULL, &opt, + N_("exit with zero when there's no error"), 'e'), + OPT_SET_INT('p', NULL, &opt, N_("pretty-print object's content"), 'p'), + OPT_SET_INT(0, "textconv", &opt, + N_("for blob objects, run textconv on object's content"), 'c'), + OPT_SET_INT(0, "batch", &batch, + N_("show info and content of objects fed from the standard input"), + BATCH), + OPT_SET_INT(0, "batch-check", &batch, + N_("show info about objects fed from the standard input"), + BATCH_CHECK), + OPT_END() + }; + + git_config(git_cat_file_config, NULL); + + if (argc != 3 && argc != 2) + usage_with_options(cat_file_usage, options); + + argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0); + + if (opt) { + if (argc == 1) + obj_name = argv[0]; + else + usage_with_options(cat_file_usage, options); + } + if (!opt && !batch) { + if (argc == 2) { + exp_type = argv[0]; + obj_name = argv[1]; + } else + usage_with_options(cat_file_usage, options); + } + if (batch && (opt || argc)) { + usage_with_options(cat_file_usage, options); + } + + if (batch) + return batch_objects(batch); + + return cat_one_file(opt, exp_type, obj_name); +} |