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