Andrew's git - gitweb.git/blob - builtin/hash-object.c

   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Junio C Hamano, 2005
   6 */
   7#include "cache.h"
   8#include "blob.h"
   9#include "quote.h"
  10#include "parse-options.h"
  11#include "exec_cmd.h"
  12
  13static void hash_fd(int fd, const char *type, int write_object, const char *path)
  14{
  15        struct stat st;
  16        unsigned char sha1[20];
  17        if (fstat(fd, &st) < 0 ||
  18            index_fd(sha1, fd, &st, write_object, type_from_string(type), path))
  19                die(write_object
  20                    ? "Unable to add %s to database"
  21                    : "Unable to hash %s", path);
  22        printf("%s\n", sha1_to_hex(sha1));
  23        maybe_flush_or_die(stdout, "hash to stdout");
  24}
  25
  26static void hash_object(const char *path, const char *type, int write_object,
  27                        const char *vpath)
  28{
  29        int fd;
  30        fd = open(path, O_RDONLY);
  31        if (fd < 0)
  32                die_errno("Cannot open '%s'", path);
  33        hash_fd(fd, type, write_object, vpath);
  34}
  35
  36static int no_filters;
  37
  38static void hash_stdin_paths(const char *type, int write_objects)
  39{
  40        struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
  41
  42        while (strbuf_getline(&buf, stdin, '\n') != EOF) {
  43                if (buf.buf[0] == '"') {
  44                        strbuf_reset(&nbuf);
  45                        if (unquote_c_style(&nbuf, buf.buf, NULL))
  46                                die("line is badly quoted");
  47                        strbuf_swap(&buf, &nbuf);
  48                }
  49                hash_object(buf.buf, type, write_objects,
  50                    no_filters ? NULL : buf.buf);
  51        }
  52        strbuf_release(&buf);
  53        strbuf_release(&nbuf);
  54}
  55
  56static const char * const hash_object_usage[] = {
  57        "git hash-object [-t <type>] [-w] [--path=<file>|--no-filters] [--stdin] [--] <file>...",
  58        "git hash-object  --stdin-paths < <list-of-paths>",
  59        NULL
  60};
  61
  62static const char *type;
  63static int write_object;
  64static int hashstdin;
  65static int stdin_paths;
  66static const char *vpath;
  67
  68static const struct option hash_object_options[] = {
  69        OPT_STRING('t', NULL, &type, "type", "object type"),
  70        OPT_BOOLEAN('w', NULL, &write_object, "write the object into the object database"),
  71        OPT_BOOLEAN( 0 , "stdin", &hashstdin, "read the object from stdin"),
  72        OPT_BOOLEAN( 0 , "stdin-paths", &stdin_paths, "read file names from stdin"),
  73        OPT_BOOLEAN( 0 , "no-filters", &no_filters, "store file as is without filters"),
  74        OPT_STRING( 0 , "path", &vpath, "file", "process file as it were from this path"),
  75        OPT_END()
  76};
  77
  78int cmd_hash_object(int argc, const char **argv, const char *prefix)
  79{
  80        int i;
  81        int prefix_length = -1;
  82        const char *errstr = NULL;
  83
  84        type = blob_type;
  85
  86        argc = parse_options(argc, argv, NULL, hash_object_options,
  87                             hash_object_usage, 0);
  88
  89        if (write_object) {
  90                prefix = setup_git_directory();
  91                prefix_length = prefix ? strlen(prefix) : 0;
  92                if (vpath && prefix)
  93                        vpath = prefix_filename(prefix, prefix_length, vpath);
  94        }
  95
  96        git_config(git_default_config, NULL);
  97
  98        if (stdin_paths) {
  99                if (hashstdin)
 100                        errstr = "Can't use --stdin-paths with --stdin";
 101                else if (argc)
 102                        errstr = "Can't specify files with --stdin-paths";
 103                else if (vpath)
 104                        errstr = "Can't use --stdin-paths with --path";
 105        }
 106        else {
 107                if (hashstdin > 1)
 108                        errstr = "Multiple --stdin arguments are not supported";
 109                if (vpath && no_filters)
 110                        errstr = "Can't use --path with --no-filters";
 111        }
 112
 113        if (errstr) {
 114                error("%s", errstr);
 115                usage_with_options(hash_object_usage, hash_object_options);
 116        }
 117
 118        if (hashstdin)
 119                hash_fd(0, type, write_object, vpath);
 120
 121        for (i = 0 ; i < argc; i++) {
 122                const char *arg = argv[i];
 123
 124                if (0 <= prefix_length)
 125                        arg = prefix_filename(prefix, prefix_length, arg);
 126                hash_object(arg, type, write_object,
 127                            no_filters ? NULL : vpath ? vpath : arg);
 128        }
 129
 130        if (stdin_paths)
 131                hash_stdin_paths(type, write_object);
 132
 133        return 0;
 134}