am: Use cat instead of echo to avoid DOS line-endings (fixes t4150)
[git/dscho.git] / ident.c
blob87c697c2b09692ec8a36d557aa0c73de38223492
1 /*
2 * ident.c
4 * create git identifier lines of the form "name <email> date"
6 * Copyright (C) 2005 Linus Torvalds
7 */
8 #include "cache.h"
10 static char git_default_date[50];
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
18 static void copy_gecos(const struct passwd *w, char *name, size_t sz)
20 char *src, *dst;
21 size_t len, nlen;
23 nlen = strlen(w->pw_name);
25 /* Traditionally GECOS field had office phone numbers etc, separated
26 * with commas. Also & stands for capitalized form of the login name.
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;
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;
46 if (len < sz)
47 name[len] = 0;
48 else
49 die("Your parents must have hated you!");
53 static int add_mailname_host(char *buf, size_t len)
55 FILE *mailname;
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;
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;
71 /* success! */
72 fclose(mailname);
73 return 0;
76 static void add_domainname(char *buf, size_t len)
78 struct hostent *he;
79 size_t namelen;
80 const char *domainname;
82 if (gethostname(buf, len)) {
83 warning("cannot get host name: %s", strerror(errno));
84 strlcpy(buf, "(none)", len);
85 return;
87 namelen = strlen(buf);
88 if (memchr(buf, '.', namelen))
89 return;
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);
101 static void copy_email(const struct passwd *pw)
104 * Make up a fake email address
105 * (name + '@' + hostname [+ '.' + domainname])
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++] = '@';
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);
120 static void setup_ident(const char **name, const char **emailp)
122 struct passwd *pw = NULL;
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));
131 if (!*name)
132 *name = git_default_name;
134 if (!*emailp && !git_default_email[0]) {
135 const char *email = getenv("EMAIL");
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);
149 if (!*emailp)
150 *emailp = git_default_email;
152 /* And set the default date */
153 if (!git_default_date[0])
154 datestamp(git_default_date, sizeof(git_default_date));
157 static int add_raw(char *buf, size_t size, int offset, const char *str)
159 size_t len = strlen(str);
160 if (offset + len > size)
161 return size;
162 memcpy(buf + offset, str, len);
163 return offset + len;
166 static int crud(unsigned char c)
168 return c <= 32 ||
169 c == '.' ||
170 c == ',' ||
171 c == ':' ||
172 c == ';' ||
173 c == '<' ||
174 c == '>' ||
175 c == '"' ||
176 c == '\\' ||
177 c == '\'';
181 * Copy over a string to the destination, but avoid special
182 * characters ('\n', '<' and '>') and remove crud at the end
184 static int copy(char *buf, size_t size, int offset, const char *src)
186 size_t i, len;
187 unsigned char c;
189 /* Remove crud from the beginning.. */
190 while ((c = *src) != 0) {
191 if (!crud(c))
192 break;
193 src++;
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;
206 * Copy the rest to the buffer, but avoid the special
207 * characters '\n' '<' and '>' that act as delimiters on
208 * an identification line
210 for (i = 0; i < len; i++) {
211 c = *src++;
212 switch (c) {
213 case '\n': case '<': case '>':
214 continue;
216 if (offset >= size)
217 return size;
218 buf[offset++] = c;
220 return offset;
224 * Reverse of fmt_ident(); given an ident line, split the fields
225 * to allow the caller to parse it.
226 * Signal a success by returning 0, but date/tz fields of the result
227 * can still be NULL if the input line only has the name/email part
228 * (e.g. reading from a reflog entry).
230 int split_ident_line(struct ident_split *split, const char *line, int len)
232 const char *cp;
233 size_t span;
234 int status = -1;
236 memset(split, 0, sizeof(*split));
238 split->name_begin = line;
239 for (cp = line; *cp && cp < line + len; cp++)
240 if (*cp == '<') {
241 split->mail_begin = cp + 1;
242 break;
244 if (!split->mail_begin)
245 return status;
247 for (cp = split->mail_begin - 2; line < cp; cp--)
248 if (!isspace(*cp)) {
249 split->name_end = cp + 1;
250 break;
252 if (!split->name_end)
253 return status;
255 for (cp = split->mail_begin; cp < line + len; cp++)
256 if (*cp == '>') {
257 split->mail_end = cp;
258 break;
260 if (!split->mail_end)
261 return status;
263 for (cp = split->mail_end + 1; cp < line + len && isspace(*cp); cp++)
265 if (line + len <= cp)
266 goto person_only;
267 split->date_begin = cp;
268 span = strspn(cp, "0123456789");
269 if (!span)
270 goto person_only;
271 split->date_end = split->date_begin + span;
272 for (cp = split->date_end; cp < line + len && isspace(*cp); cp++)
274 if (line + len <= cp || (*cp != '+' && *cp != '-'))
275 goto person_only;
276 split->tz_begin = cp;
277 span = strspn(cp + 1, "0123456789");
278 if (!span)
279 goto person_only;
280 split->tz_end = split->tz_begin + 1 + span;
281 return 0;
283 person_only:
284 split->date_begin = NULL;
285 split->date_end = NULL;
286 split->tz_begin = NULL;
287 split->tz_end = NULL;
288 return 0;
291 static const char *env_hint =
292 "\n"
293 "*** Please tell me who you are.\n"
294 "\n"
295 "Run\n"
296 "\n"
297 " git config --global user.email \"you@example.com\"\n"
298 " git config --global user.name \"Your Name\"\n"
299 "\n"
300 "to set your account\'s default identity.\n"
301 "Omit --global to set the identity only in this repository.\n"
302 "\n";
304 const char *fmt_ident(const char *name, const char *email,
305 const char *date_str, int flag)
307 static char buffer[1000];
308 char date[50];
309 int i;
310 int error_on_no_name = (flag & IDENT_ERROR_ON_NO_NAME);
311 int warn_on_no_name = (flag & IDENT_WARN_ON_NO_NAME);
312 int name_addr_only = (flag & IDENT_NO_DATE);
314 setup_ident(&name, &email);
316 if (!*name) {
317 struct passwd *pw;
319 if ((warn_on_no_name || error_on_no_name) &&
320 name == git_default_name && env_hint) {
321 fputs(env_hint, stderr);
322 env_hint = NULL; /* warn only once */
324 if (error_on_no_name)
325 die("empty ident %s <%s> not allowed", name, email);
326 pw = getpwuid(getuid());
327 if (!pw)
328 die("You don't exist. Go away!");
329 strlcpy(git_default_name, pw->pw_name,
330 sizeof(git_default_name));
331 name = git_default_name;
334 strcpy(date, git_default_date);
335 if (!name_addr_only && date_str && date_str[0]) {
336 if (parse_date(date_str, date, sizeof(date)) < 0)
337 die("invalid date format: %s", date_str);
340 i = copy(buffer, sizeof(buffer), 0, name);
341 i = add_raw(buffer, sizeof(buffer), i, " <");
342 i = copy(buffer, sizeof(buffer), i, email);
343 if (!name_addr_only) {
344 i = add_raw(buffer, sizeof(buffer), i, "> ");
345 i = copy(buffer, sizeof(buffer), i, date);
346 } else {
347 i = add_raw(buffer, sizeof(buffer), i, ">");
349 if (i >= sizeof(buffer))
350 die("Impossibly long personal identifier");
351 buffer[i] = 0;
352 return buffer;
355 const char *fmt_name(const char *name, const char *email)
357 return fmt_ident(name, email, NULL, IDENT_ERROR_ON_NO_NAME | IDENT_NO_DATE);
360 const char *git_author_info(int flag)
362 return fmt_ident(getenv("GIT_AUTHOR_NAME"),
363 getenv("GIT_AUTHOR_EMAIL"),
364 getenv("GIT_AUTHOR_DATE"),
365 flag);
368 const char *git_committer_info(int flag)
370 if (getenv("GIT_COMMITTER_NAME"))
371 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
372 if (getenv("GIT_COMMITTER_EMAIL"))
373 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
374 return fmt_ident(getenv("GIT_COMMITTER_NAME"),
375 getenv("GIT_COMMITTER_EMAIL"),
376 getenv("GIT_COMMITTER_DATE"),
377 flag);
380 int user_ident_sufficiently_given(void)
382 #ifndef WINDOWS
383 return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
384 #else
385 return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
386 #endif