Merge branch 'mr/doc-clean-f-f' into maint
[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 /*
14  * This is to create corrupt objects for debugging and as such it
15  * needs to bypass the data conversion performed by, and the type
16  * limitation imposed by, index_fd() and its callees.
17  */
18 static int hash_literally(unsigned char *sha1, int fd, const char *type, unsigned flags)
19 {
20         struct strbuf buf = STRBUF_INIT;
21         int ret;
22
23         if (strbuf_read(&buf, fd, 4096) < 0)
24                 ret = -1;
25         else if (flags & HASH_WRITE_OBJECT)
26                 ret = write_sha1_file(buf.buf, buf.len, type, sha1);
27         else
28                 ret = hash_sha1_file(buf.buf, buf.len, type, sha1);
29         strbuf_release(&buf);
30         return ret;
31 }
32
33 static void hash_fd(int fd, const char *type, const char *path, unsigned flags,
34                     int literally)
35 {
36         struct stat st;
37         unsigned char sha1[20];
38
39         if (fstat(fd, &st) < 0 ||
40             (literally
41              ? hash_literally(sha1, fd, type, flags)
42              : index_fd(sha1, fd, &st, type_from_string(type), path, flags)))
43                 die((flags & HASH_WRITE_OBJECT)
44                     ? "Unable to add %s to database"
45                     : "Unable to hash %s", path);
46         printf("%s\n", sha1_to_hex(sha1));
47         maybe_flush_or_die(stdout, "hash to stdout");
48 }
49
50 static void hash_object(const char *path, const char *type, const char *vpath,
51                         unsigned flags, int literally)
52 {
53         int fd;
54         fd = open(path, O_RDONLY);
55         if (fd < 0)
56                 die_errno("Cannot open '%s'", path);
57         hash_fd(fd, type, vpath, flags, literally);
58 }
59
60 static void hash_stdin_paths(const char *type, int no_filters, unsigned flags,
61                              int literally)
62 {
63         struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
64
65         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
66                 if (buf.buf[0] == '"') {
67                         strbuf_reset(&nbuf);
68                         if (unquote_c_style(&nbuf, buf.buf, NULL))
69                                 die("line is badly quoted");
70                         strbuf_swap(&buf, &nbuf);
71                 }
72                 hash_object(buf.buf, type, no_filters ? NULL : buf.buf, flags,
73                             literally);
74         }
75         strbuf_release(&buf);
76         strbuf_release(&nbuf);
77 }
78
79 int cmd_hash_object(int argc, const char **argv, const char *prefix)
80 {
81         static const char * const hash_object_usage[] = {
82                 N_("git hash-object [-t <type>] [-w] [--path=<file>|--no-filters] [--stdin] [--] <file>..."),
83                 N_("git hash-object  --stdin-paths < <list-of-paths>"),
84                 NULL
85         };
86         const char *type = blob_type;
87         int hashstdin = 0;
88         int stdin_paths = 0;
89         int no_filters = 0;
90         int literally = 0;
91         unsigned flags = HASH_FORMAT_CHECK;
92         const char *vpath = NULL;
93         const struct option hash_object_options[] = {
94                 OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
95                 OPT_BIT('w', NULL, &flags, N_("write the object into the object database"),
96                         HASH_WRITE_OBJECT),
97                 OPT_COUNTUP( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
98                 OPT_BOOL( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
99                 OPT_BOOL( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
100                 OPT_BOOL( 0, "literally", &literally, N_("just hash any random garbage to create corrupt objects for debugging Git")),
101                 OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
102                 OPT_END()
103         };
104         int i;
105         int prefix_length = -1;
106         const char *errstr = NULL;
107
108         argc = parse_options(argc, argv, NULL, hash_object_options,
109                              hash_object_usage, 0);
110
111         if (flags & HASH_WRITE_OBJECT) {
112                 prefix = setup_git_directory();
113                 prefix_length = prefix ? strlen(prefix) : 0;
114                 if (vpath && prefix)
115                         vpath = prefix_filename(prefix, prefix_length, vpath);
116         }
117
118         git_config(git_default_config, NULL);
119
120         if (stdin_paths) {
121                 if (hashstdin)
122                         errstr = "Can't use --stdin-paths with --stdin";
123                 else if (argc)
124                         errstr = "Can't specify files with --stdin-paths";
125                 else if (vpath)
126                         errstr = "Can't use --stdin-paths with --path";
127         }
128         else {
129                 if (hashstdin > 1)
130                         errstr = "Multiple --stdin arguments are not supported";
131                 if (vpath && no_filters)
132                         errstr = "Can't use --path with --no-filters";
133         }
134
135         if (errstr) {
136                 error("%s", errstr);
137                 usage_with_options(hash_object_usage, hash_object_options);
138         }
139
140         if (hashstdin)
141                 hash_fd(0, type, vpath, flags, literally);
142
143         for (i = 0 ; i < argc; i++) {
144                 const char *arg = argv[i];
145
146                 if (0 <= prefix_length)
147                         arg = prefix_filename(prefix, prefix_length, arg);
148                 hash_object(arg, type, no_filters ? NULL : vpath ? vpath : arg,
149                             flags, literally);
150         }
151
152         if (stdin_paths)
153                 hash_stdin_paths(type, no_filters, flags, literally);
154
155         return 0;
156 }