1 /*
2 * libgit2 "cat-file" example - shows how to print data from the ODB
3 *
4 * Written by the libgit2 contributors
5 *
6 * To the extent possible under law, the author(s) have dedicated all copyright
7 * and related and neighboring rights to this software to the public domain
8 * worldwide. This software is distributed without any warranty.
9 *
10 * You should have received a copy of the CC0 Public Domain Dedication along
11 * with this software. If not, see
12 * <http://creativecommons.org/publicdomain/zero/1.0/>.
13 */
14
15 #include "common.h"
16
print_signature(const char * header,const git_signature * sig)17 static void print_signature(const char *header, const git_signature *sig)
18 {
19 char sign;
20 int offset, hours, minutes;
21
22 if (!sig)
23 return;
24
25 offset = sig->when.offset;
26 if (offset < 0) {
27 sign = '-';
28 offset = -offset;
29 } else {
30 sign = '+';
31 }
32
33 hours = offset / 60;
34 minutes = offset % 60;
35
36 printf("%s %s <%s> %ld %c%02d%02d\n",
37 header, sig->name, sig->email, (long)sig->when.time,
38 sign, hours, minutes);
39 }
40
41 /** Printing out a blob is simple, get the contents and print */
show_blob(const git_blob * blob)42 static void show_blob(const git_blob *blob)
43 {
44 /* ? Does this need crlf filtering? */
45 fwrite(git_blob_rawcontent(blob), (size_t)git_blob_rawsize(blob), 1, stdout);
46 }
47
48 /** Show each entry with its type, id and attributes */
show_tree(const git_tree * tree)49 static void show_tree(const git_tree *tree)
50 {
51 size_t i, max_i = (int)git_tree_entrycount(tree);
52 char oidstr[GIT_OID_HEXSZ + 1];
53 const git_tree_entry *te;
54
55 for (i = 0; i < max_i; ++i) {
56 te = git_tree_entry_byindex(tree, i);
57
58 git_oid_tostr(oidstr, sizeof(oidstr), git_tree_entry_id(te));
59
60 printf("%06o %s %s\t%s\n",
61 git_tree_entry_filemode(te),
62 git_object_type2string(git_tree_entry_type(te)),
63 oidstr, git_tree_entry_name(te));
64 }
65 }
66
67 /**
68 * Commits and tags have a few interesting fields in their header.
69 */
show_commit(const git_commit * commit)70 static void show_commit(const git_commit *commit)
71 {
72 unsigned int i, max_i;
73 char oidstr[GIT_OID_HEXSZ + 1];
74
75 git_oid_tostr(oidstr, sizeof(oidstr), git_commit_tree_id(commit));
76 printf("tree %s\n", oidstr);
77
78 max_i = (unsigned int)git_commit_parentcount(commit);
79 for (i = 0; i < max_i; ++i) {
80 git_oid_tostr(oidstr, sizeof(oidstr), git_commit_parent_id(commit, i));
81 printf("parent %s\n", oidstr);
82 }
83
84 print_signature("author", git_commit_author(commit));
85 print_signature("committer", git_commit_committer(commit));
86
87 if (git_commit_message(commit))
88 printf("\n%s\n", git_commit_message(commit));
89 }
90
show_tag(const git_tag * tag)91 static void show_tag(const git_tag *tag)
92 {
93 char oidstr[GIT_OID_HEXSZ + 1];
94
95 git_oid_tostr(oidstr, sizeof(oidstr), git_tag_target_id(tag));;
96 printf("object %s\n", oidstr);
97 printf("type %s\n", git_object_type2string(git_tag_target_type(tag)));
98 printf("tag %s\n", git_tag_name(tag));
99 print_signature("tagger", git_tag_tagger(tag));
100
101 if (git_tag_message(tag))
102 printf("\n%s\n", git_tag_message(tag));
103 }
104
105 enum {
106 SHOW_TYPE = 1,
107 SHOW_SIZE = 2,
108 SHOW_NONE = 3,
109 SHOW_PRETTY = 4
110 };
111
112 /* Forward declarations for option-parsing helper */
113 struct opts {
114 const char *dir;
115 const char *rev;
116 int action;
117 int verbose;
118 };
119 static void parse_opts(struct opts *o, int argc, char *argv[]);
120
121
122 /** Entry point for this command */
lg2_cat_file(git_repository * repo,int argc,char * argv[])123 int lg2_cat_file(git_repository *repo, int argc, char *argv[])
124 {
125 struct opts o = { ".", NULL, 0, 0 };
126 git_object *obj = NULL;
127 char oidstr[GIT_OID_HEXSZ + 1];
128
129 parse_opts(&o, argc, argv);
130
131 check_lg2(git_revparse_single(&obj, repo, o.rev),
132 "Could not resolve", o.rev);
133
134 if (o.verbose) {
135 char oidstr[GIT_OID_HEXSZ + 1];
136 git_oid_tostr(oidstr, sizeof(oidstr), git_object_id(obj));
137
138 printf("%s %s\n--\n",
139 git_object_type2string(git_object_type(obj)), oidstr);
140 }
141
142 switch (o.action) {
143 case SHOW_TYPE:
144 printf("%s\n", git_object_type2string(git_object_type(obj)));
145 break;
146 case SHOW_SIZE: {
147 git_odb *odb;
148 git_odb_object *odbobj;
149
150 check_lg2(git_repository_odb(&odb, repo), "Could not open ODB", NULL);
151 check_lg2(git_odb_read(&odbobj, odb, git_object_id(obj)),
152 "Could not find obj", NULL);
153
154 printf("%ld\n", (long)git_odb_object_size(odbobj));
155
156 git_odb_object_free(odbobj);
157 git_odb_free(odb);
158 }
159 break;
160 case SHOW_NONE:
161 /* just want return result */
162 break;
163 case SHOW_PRETTY:
164
165 switch (git_object_type(obj)) {
166 case GIT_OBJECT_BLOB:
167 show_blob((const git_blob *)obj);
168 break;
169 case GIT_OBJECT_COMMIT:
170 show_commit((const git_commit *)obj);
171 break;
172 case GIT_OBJECT_TREE:
173 show_tree((const git_tree *)obj);
174 break;
175 case GIT_OBJECT_TAG:
176 show_tag((const git_tag *)obj);
177 break;
178 default:
179 printf("unknown %s\n", oidstr);
180 break;
181 }
182 break;
183 }
184
185 git_object_free(obj);
186
187 return 0;
188 }
189
190 /** Print out usage information */
usage(const char * message,const char * arg)191 static void usage(const char *message, const char *arg)
192 {
193 if (message && arg)
194 fprintf(stderr, "%s: %s\n", message, arg);
195 else if (message)
196 fprintf(stderr, "%s\n", message);
197 fprintf(stderr,
198 "usage: cat-file (-t | -s | -e | -p) [-v] [-q] "
199 "[-h|--help] [--git-dir=<dir>] <object>\n");
200 exit(1);
201 }
202
203 /** Parse the command-line options taken from git */
parse_opts(struct opts * o,int argc,char * argv[])204 static void parse_opts(struct opts *o, int argc, char *argv[])
205 {
206 struct args_info args = ARGS_INFO_INIT;
207
208 for (args.pos = 1; args.pos < argc; ++args.pos) {
209 char *a = argv[args.pos];
210
211 if (a[0] != '-') {
212 if (o->rev != NULL)
213 usage("Only one rev should be provided", NULL);
214 else
215 o->rev = a;
216 }
217 else if (!strcmp(a, "-t"))
218 o->action = SHOW_TYPE;
219 else if (!strcmp(a, "-s"))
220 o->action = SHOW_SIZE;
221 else if (!strcmp(a, "-e"))
222 o->action = SHOW_NONE;
223 else if (!strcmp(a, "-p"))
224 o->action = SHOW_PRETTY;
225 else if (!strcmp(a, "-q"))
226 o->verbose = 0;
227 else if (!strcmp(a, "-v"))
228 o->verbose = 1;
229 else if (!strcmp(a, "--help") || !strcmp(a, "-h"))
230 usage(NULL, NULL);
231 else if (!match_str_arg(&o->dir, &args, "--git-dir"))
232 usage("Unknown option", a);
233 }
234
235 if (!o->action || !o->rev)
236 usage(NULL, NULL);
237
238 }
239