Merge branch 'mz/pick-unborn'
[git] / 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 "builtin.h"
8 #include "blob.h"
9 #include "quote.h"
10 #include "parse-options.h"
11 #include "exec_cmd.h"
12
13 static 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         unsigned flags = (HASH_FORMAT_CHECK |
18                           (write_object ? HASH_WRITE_OBJECT : 0));
19
20         if (fstat(fd, &st) < 0 ||
21             index_fd(sha1, fd, &st, type_from_string(type), path, flags))
22                 die(write_object
23                     ? "Unable to add %s to database"
24                     : "Unable to hash %s", path);
25         printf("%s\n", sha1_to_hex(sha1));
26         maybe_flush_or_die(stdout, "hash to stdout");
27 }
28
29 static void hash_object(const char *path, const char *type, int write_object,
30                         const char *vpath)
31 {
32         int fd;
33         fd = open(path, O_RDONLY);
34         if (fd < 0)
35                 die_errno("Cannot open '%s'", path);
36         hash_fd(fd, type, write_object, vpath);
37 }
38
39 static int no_filters;
40
41 static void hash_stdin_paths(const char *type, int write_objects)
42 {
43         struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
44
45         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
46                 if (buf.buf[0] == '"') {
47                         strbuf_reset(&nbuf);
48                         if (unquote_c_style(&nbuf, buf.buf, NULL))
49                                 die("line is badly quoted");
50                         strbuf_swap(&buf, &nbuf);
51                 }
52                 hash_object(buf.buf, type, write_objects,
53                     no_filters ? NULL : buf.buf);
54         }
55         strbuf_release(&buf);
56         strbuf_release(&nbuf);
57 }
58
59 static const char * const hash_object_usage[] = {
60         N_("git hash-object [-t <type>] [-w] [--path=<file>|--no-filters] [--stdin] [--] <file>..."),
61         N_("git hash-object  --stdin-paths < <list-of-paths>"),
62         NULL
63 };
64
65 static const char *type;
66 static int write_object;
67 static int hashstdin;
68 static int stdin_paths;
69 static const char *vpath;
70
71 static const struct option hash_object_options[] = {
72         OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
73         OPT_BOOLEAN('w', NULL, &write_object, N_("write the object into the object database")),
74         OPT_BOOLEAN( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
75         OPT_BOOLEAN( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
76         OPT_BOOLEAN( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
77         OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
78         OPT_END()
79 };
80
81 int cmd_hash_object(int argc, const char **argv, const char *prefix)
82 {
83         int i;
84         int prefix_length = -1;
85         const char *errstr = NULL;
86
87         type = blob_type;
88
89         argc = parse_options(argc, argv, NULL, hash_object_options,
90                              hash_object_usage, 0);
91
92         if (write_object) {
93                 prefix = setup_git_directory();
94                 prefix_length = prefix ? strlen(prefix) : 0;
95                 if (vpath && prefix)
96                         vpath = prefix_filename(prefix, prefix_length, vpath);
97         }
98
99         git_config(git_default_config, NULL);
100
101         if (stdin_paths) {
102                 if (hashstdin)
103                         errstr = "Can't use --stdin-paths with --stdin";
104                 else if (argc)
105                         errstr = "Can't specify files with --stdin-paths";
106                 else if (vpath)
107                         errstr = "Can't use --stdin-paths with --path";
108         }
109         else {
110                 if (hashstdin > 1)
111                         errstr = "Multiple --stdin arguments are not supported";
112                 if (vpath && no_filters)
113                         errstr = "Can't use --path with --no-filters";
114         }
115
116         if (errstr) {
117                 error("%s", errstr);
118                 usage_with_options(hash_object_usage, hash_object_options);
119         }
120
121         if (hashstdin)
122                 hash_fd(0, type, write_object, vpath);
123
124         for (i = 0 ; i < argc; i++) {
125                 const char *arg = argv[i];
126
127                 if (0 <= prefix_length)
128                         arg = prefix_filename(prefix, prefix_length, arg);
129                 hash_object(arg, type, write_object,
130                             no_filters ? NULL : vpath ? vpath : arg);
131         }
132
133         if (stdin_paths)
134                 hash_stdin_paths(type, write_object);
135
136         return 0;
137 }