Merge branch 'mb/filter-branch-optim'
[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 "config.h"
9 #include "object-store.h"
10 #include "blob.h"
11 #include "quote.h"
12 #include "parse-options.h"
13 #include "exec-cmd.h"
14
15 /*
16  * This is to create corrupt objects for debugging and as such it
17  * needs to bypass the data conversion performed by, and the type
18  * limitation imposed by, index_fd() and its callees.
19  */
20 static int hash_literally(struct object_id *oid, int fd, const char *type, unsigned flags)
21 {
22         struct strbuf buf = STRBUF_INIT;
23         int ret;
24
25         if (strbuf_read(&buf, fd, 4096) < 0)
26                 ret = -1;
27         else
28                 ret = hash_object_file_literally(buf.buf, buf.len, type, oid,
29                                                  flags);
30         strbuf_release(&buf);
31         return ret;
32 }
33
34 static void hash_fd(int fd, const char *type, const char *path, unsigned flags,
35                     int literally)
36 {
37         struct stat st;
38         struct object_id oid;
39
40         if (fstat(fd, &st) < 0 ||
41             (literally
42              ? hash_literally(&oid, fd, type, flags)
43              : index_fd(&oid, fd, &st, type_from_string(type), path, flags)))
44                 die((flags & HASH_WRITE_OBJECT)
45                     ? "Unable to add %s to database"
46                     : "Unable to hash %s", path);
47         printf("%s\n", oid_to_hex(&oid));
48         maybe_flush_or_die(stdout, "hash to stdout");
49 }
50
51 static void hash_object(const char *path, const char *type, const char *vpath,
52                         unsigned flags, int literally)
53 {
54         int fd;
55         fd = open(path, O_RDONLY);
56         if (fd < 0)
57                 die_errno("Cannot open '%s'", path);
58         hash_fd(fd, type, vpath, flags, literally);
59 }
60
61 static void hash_stdin_paths(const char *type, int no_filters, unsigned flags,
62                              int literally)
63 {
64         struct strbuf buf = STRBUF_INIT;
65         struct strbuf unquoted = STRBUF_INIT;
66
67         while (strbuf_getline(&buf, stdin) != EOF) {
68                 if (buf.buf[0] == '"') {
69                         strbuf_reset(&unquoted);
70                         if (unquote_c_style(&unquoted, buf.buf, NULL))
71                                 die("line is badly quoted");
72                         strbuf_swap(&buf, &unquoted);
73                 }
74                 hash_object(buf.buf, type, no_filters ? NULL : buf.buf, flags,
75                             literally);
76         }
77         strbuf_release(&buf);
78         strbuf_release(&unquoted);
79 }
80
81 int cmd_hash_object(int argc, const char **argv, const char *prefix)
82 {
83         static const char * const hash_object_usage[] = {
84                 N_("git hash-object [-t <type>] [-w] [--path=<file> | --no-filters] [--stdin] [--] <file>..."),
85                 N_("git hash-object  --stdin-paths"),
86                 NULL
87         };
88         const char *type = blob_type;
89         int hashstdin = 0;
90         int stdin_paths = 0;
91         int no_filters = 0;
92         int literally = 0;
93         int nongit = 0;
94         unsigned flags = HASH_FORMAT_CHECK;
95         const char *vpath = NULL;
96         const struct option hash_object_options[] = {
97                 OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
98                 OPT_BIT('w', NULL, &flags, N_("write the object into the object database"),
99                         HASH_WRITE_OBJECT),
100                 OPT_COUNTUP( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
101                 OPT_BOOL( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
102                 OPT_BOOL( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
103                 OPT_BOOL( 0, "literally", &literally, N_("just hash any random garbage to create corrupt objects for debugging Git")),
104                 OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
105                 OPT_END()
106         };
107         int i;
108         const char *errstr = NULL;
109
110         argc = parse_options(argc, argv, NULL, hash_object_options,
111                              hash_object_usage, 0);
112
113         if (flags & HASH_WRITE_OBJECT)
114                 prefix = setup_git_directory();
115         else
116                 prefix = setup_git_directory_gently(&nongit);
117
118         if (vpath && prefix)
119                 vpath = xstrdup(prefix_filename(prefix, vpath));
120
121         git_config(git_default_config, NULL);
122
123         if (stdin_paths) {
124                 if (hashstdin)
125                         errstr = "Can't use --stdin-paths with --stdin";
126                 else if (argc)
127                         errstr = "Can't specify files with --stdin-paths";
128                 else if (vpath)
129                         errstr = "Can't use --stdin-paths with --path";
130         }
131         else {
132                 if (hashstdin > 1)
133                         errstr = "Multiple --stdin arguments are not supported";
134                 if (vpath && no_filters)
135                         errstr = "Can't use --path with --no-filters";
136         }
137
138         if (errstr) {
139                 error("%s", errstr);
140                 usage_with_options(hash_object_usage, hash_object_options);
141         }
142
143         if (hashstdin)
144                 hash_fd(0, type, vpath, flags, literally);
145
146         for (i = 0 ; i < argc; i++) {
147                 const char *arg = argv[i];
148                 char *to_free = NULL;
149
150                 if (prefix)
151                         arg = to_free = prefix_filename(prefix, arg);
152                 hash_object(arg, type, no_filters ? NULL : vpath ? vpath : arg,
153                             flags, literally);
154                 free(to_free);
155         }
156
157         if (stdin_paths)
158                 hash_stdin_paths(type, no_filters, flags, literally);
159
160         return 0;
161 }