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1 | /* | |
2 | * ident.c | |
3 | * | |
4 | * create git identifier lines of the form "name <email> date" | |
5 | * | |
6 | * Copyright (C) 2005 Linus Torvalds | |
7 | */ | |
8 | #include "cache.h" | |
9 | ||
10 | static char git_default_date[50]; | |
11 | ||
12 | #ifdef NO_GECOS_IN_PWENT | |
13 | #define get_gecos(ignored) "&" | |
14 | #else | |
15 | #define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos) | |
16 | #endif | |
17 | ||
18 | static void copy_gecos(const struct passwd *w, char *name, size_t sz) | |
19 | { | |
20 | char *src, *dst; | |
21 | size_t len, nlen; | |
22 | ||
23 | nlen = strlen(w->pw_name); | |
24 | ||
25 | /* Traditionally GECOS field had office phone numbers etc, separated | |
26 | * with commas. Also & stands for capitalized form of the login name. | |
27 | */ | |
28 | ||
29 | for (len = 0, dst = name, src = get_gecos(w); len < sz; src++) { | |
30 | int ch = *src; | |
31 | if (ch != '&') { | |
32 | *dst++ = ch; | |
33 | if (ch == 0 || ch == ',') | |
34 | break; | |
35 | len++; | |
36 | continue; | |
37 | } | |
38 | if (len + nlen < sz) { | |
39 | /* Sorry, Mr. McDonald... */ | |
40 | *dst++ = toupper(*w->pw_name); | |
41 | memcpy(dst, w->pw_name + 1, nlen - 1); | |
42 | dst += nlen - 1; | |
43 | len += nlen; | |
44 | } | |
45 | } | |
46 | if (len < sz) | |
47 | name[len] = 0; | |
48 | else | |
49 | die("Your parents must have hated you!"); | |
50 | ||
51 | } | |
52 | ||
53 | static int add_mailname_host(char *buf, size_t len) | |
54 | { | |
55 | FILE *mailname; | |
56 | ||
57 | mailname = fopen("/etc/mailname", "r"); | |
58 | if (!mailname) { | |
59 | if (errno != ENOENT) | |
60 | warning("cannot open /etc/mailname: %s", | |
61 | strerror(errno)); | |
62 | return -1; | |
63 | } | |
64 | if (!fgets(buf, len, mailname)) { | |
65 | if (ferror(mailname)) | |
66 | warning("cannot read /etc/mailname: %s", | |
67 | strerror(errno)); | |
68 | fclose(mailname); | |
69 | return -1; | |
70 | } | |
71 | /* success! */ | |
72 | fclose(mailname); | |
73 | return 0; | |
74 | } | |
75 | ||
76 | static void add_domainname(char *buf, size_t len) | |
77 | { | |
78 | struct hostent *he; | |
79 | size_t namelen; | |
80 | const char *domainname; | |
81 | ||
82 | if (gethostname(buf, len)) { | |
83 | warning("cannot get host name: %s", strerror(errno)); | |
84 | strlcpy(buf, "(none)", len); | |
85 | return; | |
86 | } | |
87 | namelen = strlen(buf); | |
88 | if (memchr(buf, '.', namelen)) | |
89 | return; | |
90 | ||
91 | he = gethostbyname(buf); | |
92 | buf[namelen++] = '.'; | |
93 | buf += namelen; | |
94 | len -= namelen; | |
95 | if (he && (domainname = strchr(he->h_name, '.'))) | |
96 | strlcpy(buf, domainname + 1, len); | |
97 | else | |
98 | strlcpy(buf, "(none)", len); | |
99 | } | |
100 | ||
101 | static void copy_email(const struct passwd *pw) | |
102 | { | |
103 | /* | |
104 | * Make up a fake email address | |
105 | * (name + '@' + hostname [+ '.' + domainname]) | |
106 | */ | |
107 | size_t len = strlen(pw->pw_name); | |
108 | if (len > sizeof(git_default_email)/2) | |
109 | die("Your sysadmin must hate you!"); | |
110 | memcpy(git_default_email, pw->pw_name, len); | |
111 | git_default_email[len++] = '@'; | |
112 | ||
113 | if (!add_mailname_host(git_default_email + len, | |
114 | sizeof(git_default_email) - len)) | |
115 | return; /* read from "/etc/mailname" (Debian) */ | |
116 | add_domainname(git_default_email + len, | |
117 | sizeof(git_default_email) - len); | |
118 | } | |
119 | ||
120 | static void setup_ident(const char **name, const char **emailp) | |
121 | { | |
122 | struct passwd *pw = NULL; | |
123 | ||
124 | /* Get the name ("gecos") */ | |
125 | if (!*name && !git_default_name[0]) { | |
126 | pw = getpwuid(getuid()); | |
127 | if (!pw) | |
128 | die("You don't exist. Go away!"); | |
129 | copy_gecos(pw, git_default_name, sizeof(git_default_name)); | |
130 | } | |
131 | if (!*name) | |
132 | *name = git_default_name; | |
133 | ||
134 | if (!*emailp && !git_default_email[0]) { | |
135 | const char *email = getenv("EMAIL"); | |
136 | ||
137 | if (email && email[0]) { | |
138 | strlcpy(git_default_email, email, | |
139 | sizeof(git_default_email)); | |
140 | user_ident_explicitly_given |= IDENT_MAIL_GIVEN; | |
141 | } else { | |
142 | if (!pw) | |
143 | pw = getpwuid(getuid()); | |
144 | if (!pw) | |
145 | die("You don't exist. Go away!"); | |
146 | copy_email(pw); | |
147 | } | |
148 | } | |
149 | if (!*emailp) | |
150 | *emailp = git_default_email; | |
151 | ||
152 | /* And set the default date */ | |
153 | if (!git_default_date[0]) | |
154 | datestamp(git_default_date, sizeof(git_default_date)); | |
155 | } | |
156 | ||
157 | static int add_raw(char *buf, size_t size, int offset, const char *str) | |
158 | { | |
159 | size_t len = strlen(str); | |
160 | if (offset + len > size) | |
161 | return size; | |
162 | memcpy(buf + offset, str, len); | |
163 | return offset + len; | |
164 | } | |
165 | ||
166 | static int crud(unsigned char c) | |
167 | { | |
168 | return c <= 32 || | |
169 | c == '.' || | |
170 | c == ',' || | |
171 | c == ':' || | |
172 | c == ';' || | |
173 | c == '<' || | |
174 | c == '>' || | |
175 | c == '"' || | |
176 | c == '\\' || | |
177 | c == '\''; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Copy over a string to the destination, but avoid special | |
182 | * characters ('\n', '<' and '>') and remove crud at the end | |
183 | */ | |
184 | static int copy(char *buf, size_t size, int offset, const char *src) | |
185 | { | |
186 | size_t i, len; | |
187 | unsigned char c; | |
188 | ||
189 | /* Remove crud from the beginning.. */ | |
190 | while ((c = *src) != 0) { | |
191 | if (!crud(c)) | |
192 | break; | |
193 | src++; | |
194 | } | |
195 | ||
196 | /* Remove crud from the end.. */ | |
197 | len = strlen(src); | |
198 | while (len > 0) { | |
199 | c = src[len-1]; | |
200 | if (!crud(c)) | |
201 | break; | |
202 | --len; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Copy the rest to the buffer, but avoid the special | |
207 | * characters '\n' '<' and '>' that act as delimiters on | |
208 | * an identification line | |
209 | */ | |
210 | for (i = 0; i < len; i++) { | |
211 | c = *src++; | |
212 | switch (c) { | |
213 | case '\n': case '<': case '>': | |
214 | continue; | |
215 | } | |
216 | if (offset >= size) | |
217 | return size; | |
218 | buf[offset++] = c; | |
219 | } | |
220 | return offset; | |
221 | } | |
222 | ||
223 | static const char *env_hint = | |
224 | "\n" | |
225 | "*** Please tell me who you are.\n" | |
226 | "\n" | |
227 | "Run\n" | |
228 | "\n" | |
229 | " git config --global user.email \"you@example.com\"\n" | |
230 | " git config --global user.name \"Your Name\"\n" | |
231 | "\n" | |
232 | "to set your account\'s default identity.\n" | |
233 | "Omit --global to set the identity only in this repository.\n" | |
234 | "\n"; | |
235 | ||
236 | const char *fmt_ident(const char *name, const char *email, | |
237 | const char *date_str, int flag) | |
238 | { | |
239 | static char buffer[1000]; | |
240 | char date[50]; | |
241 | int i; | |
242 | int error_on_no_name = (flag & IDENT_ERROR_ON_NO_NAME); | |
243 | int warn_on_no_name = (flag & IDENT_WARN_ON_NO_NAME); | |
244 | int name_addr_only = (flag & IDENT_NO_DATE); | |
245 | ||
246 | setup_ident(&name, &email); | |
247 | ||
248 | if (!*name) { | |
249 | struct passwd *pw; | |
250 | ||
251 | if ((warn_on_no_name || error_on_no_name) && | |
252 | name == git_default_name && env_hint) { | |
253 | fputs(env_hint, stderr); | |
254 | env_hint = NULL; /* warn only once */ | |
255 | } | |
256 | if (error_on_no_name) | |
257 | die("empty ident %s <%s> not allowed", name, email); | |
258 | pw = getpwuid(getuid()); | |
259 | if (!pw) | |
260 | die("You don't exist. Go away!"); | |
261 | strlcpy(git_default_name, pw->pw_name, | |
262 | sizeof(git_default_name)); | |
263 | name = git_default_name; | |
264 | } | |
265 | ||
266 | strcpy(date, git_default_date); | |
267 | if (!name_addr_only && date_str && date_str[0]) { | |
268 | if (parse_date(date_str, date, sizeof(date)) < 0) | |
269 | die("invalid date format: %s", date_str); | |
270 | } | |
271 | ||
272 | i = copy(buffer, sizeof(buffer), 0, name); | |
273 | i = add_raw(buffer, sizeof(buffer), i, " <"); | |
274 | i = copy(buffer, sizeof(buffer), i, email); | |
275 | if (!name_addr_only) { | |
276 | i = add_raw(buffer, sizeof(buffer), i, "> "); | |
277 | i = copy(buffer, sizeof(buffer), i, date); | |
278 | } else { | |
279 | i = add_raw(buffer, sizeof(buffer), i, ">"); | |
280 | } | |
281 | if (i >= sizeof(buffer)) | |
282 | die("Impossibly long personal identifier"); | |
283 | buffer[i] = 0; | |
284 | return buffer; | |
285 | } | |
286 | ||
287 | const char *fmt_name(const char *name, const char *email) | |
288 | { | |
289 | return fmt_ident(name, email, NULL, IDENT_ERROR_ON_NO_NAME | IDENT_NO_DATE); | |
290 | } | |
291 | ||
292 | const char *git_author_info(int flag) | |
293 | { | |
294 | return fmt_ident(getenv("GIT_AUTHOR_NAME"), | |
295 | getenv("GIT_AUTHOR_EMAIL"), | |
296 | getenv("GIT_AUTHOR_DATE"), | |
297 | flag); | |
298 | } | |
299 | ||
300 | const char *git_committer_info(int flag) | |
301 | { | |
302 | if (getenv("GIT_COMMITTER_NAME")) | |
303 | user_ident_explicitly_given |= IDENT_NAME_GIVEN; | |
304 | if (getenv("GIT_COMMITTER_EMAIL")) | |
305 | user_ident_explicitly_given |= IDENT_MAIL_GIVEN; | |
306 | return fmt_ident(getenv("GIT_COMMITTER_NAME"), | |
307 | getenv("GIT_COMMITTER_EMAIL"), | |
308 | getenv("GIT_COMMITTER_DATE"), | |
309 | flag); | |
310 | } | |
311 | ||
312 | int user_ident_sufficiently_given(void) | |
313 | { | |
314 | #ifndef WINDOWS | |
315 | return (user_ident_explicitly_given & IDENT_MAIL_GIVEN); | |
316 | #else | |
317 | return (user_ident_explicitly_given == IDENT_ALL_GIVEN); | |
318 | #endif | |
319 | } |