git-commit: clean up die messages
[git/git.git] / ident.c
... / ...
CommitLineData
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
10static char git_default_date[50];
11
12static void copy_gecos(const struct passwd *w, char *name, size_t sz)
13{
14 char *src, *dst;
15 size_t len, nlen;
16
17 nlen = strlen(w->pw_name);
18
19 /* Traditionally GECOS field had office phone numbers etc, separated
20 * with commas. Also & stands for capitalized form of the login name.
21 */
22
23 for (len = 0, dst = name, src = w->pw_gecos; len < sz; src++) {
24 int ch = *src;
25 if (ch != '&') {
26 *dst++ = ch;
27 if (ch == 0 || ch == ',')
28 break;
29 len++;
30 continue;
31 }
32 if (len + nlen < sz) {
33 /* Sorry, Mr. McDonald... */
34 *dst++ = toupper(*w->pw_name);
35 memcpy(dst, w->pw_name + 1, nlen - 1);
36 dst += nlen - 1;
37 }
38 }
39 if (len < sz)
40 name[len] = 0;
41 else
42 die("Your parents must have hated you!");
43
44}
45
46static void copy_email(const struct passwd *pw)
47{
48 /*
49 * Make up a fake email address
50 * (name + '@' + hostname [+ '.' + domainname])
51 */
52 size_t len = strlen(pw->pw_name);
53 if (len > sizeof(git_default_email)/2)
54 die("Your sysadmin must hate you!");
55 memcpy(git_default_email, pw->pw_name, len);
56 git_default_email[len++] = '@';
57 gethostname(git_default_email + len, sizeof(git_default_email) - len);
58 if (!strchr(git_default_email+len, '.')) {
59 struct hostent *he = gethostbyname(git_default_email + len);
60 char *domainname;
61
62 len = strlen(git_default_email);
63 git_default_email[len++] = '.';
64 if (he && (domainname = strchr(he->h_name, '.')))
65 strlcpy(git_default_email + len, domainname + 1,
66 sizeof(git_default_email) - len);
67 else
68 strlcpy(git_default_email + len, "(none)",
69 sizeof(git_default_email) - len);
70 }
71}
72
73static void setup_ident(void)
74{
75 struct passwd *pw = NULL;
76
77 /* Get the name ("gecos") */
78 if (!git_default_name[0]) {
79 pw = getpwuid(getuid());
80 if (!pw)
81 die("You don't exist. Go away!");
82 copy_gecos(pw, git_default_name, sizeof(git_default_name));
83 }
84
85 if (!git_default_email[0]) {
86 const char *email = getenv("EMAIL");
87
88 if (email && email[0])
89 strlcpy(git_default_email, email,
90 sizeof(git_default_email));
91 else {
92 if (!pw)
93 pw = getpwuid(getuid());
94 if (!pw)
95 die("You don't exist. Go away!");
96 copy_email(pw);
97 }
98 }
99
100 /* And set the default date */
101 if (!git_default_date[0])
102 datestamp(git_default_date, sizeof(git_default_date));
103}
104
105static int add_raw(char *buf, size_t size, int offset, const char *str)
106{
107 size_t len = strlen(str);
108 if (offset + len > size)
109 return size;
110 memcpy(buf + offset, str, len);
111 return offset + len;
112}
113
114static int crud(unsigned char c)
115{
116 static char crud_array[256];
117 static int crud_array_initialized = 0;
118
119 if (!crud_array_initialized) {
120 int k;
121
122 for (k = 0; k <= 31; ++k) crud_array[k] = 1;
123 crud_array[' '] = 1;
124 crud_array['.'] = 1;
125 crud_array[','] = 1;
126 crud_array[':'] = 1;
127 crud_array[';'] = 1;
128 crud_array['<'] = 1;
129 crud_array['>'] = 1;
130 crud_array['"'] = 1;
131 crud_array['\''] = 1;
132 crud_array_initialized = 1;
133 }
134 return crud_array[c];
135}
136
137/*
138 * Copy over a string to the destination, but avoid special
139 * characters ('\n', '<' and '>') and remove crud at the end
140 */
141static int copy(char *buf, size_t size, int offset, const char *src)
142{
143 size_t i, len;
144 unsigned char c;
145
146 /* Remove crud from the beginning.. */
147 while ((c = *src) != 0) {
148 if (!crud(c))
149 break;
150 src++;
151 }
152
153 /* Remove crud from the end.. */
154 len = strlen(src);
155 while (len > 0) {
156 c = src[len-1];
157 if (!crud(c))
158 break;
159 --len;
160 }
161
162 /*
163 * Copy the rest to the buffer, but avoid the special
164 * characters '\n' '<' and '>' that act as delimiters on
165 * a identification line
166 */
167 for (i = 0; i < len; i++) {
168 c = *src++;
169 switch (c) {
170 case '\n': case '<': case '>':
171 continue;
172 }
173 if (offset >= size)
174 return size;
175 buf[offset++] = c;
176 }
177 return offset;
178}
179
180static const char au_env[] = "GIT_AUTHOR_NAME";
181static const char co_env[] = "GIT_COMMITTER_NAME";
182static const char *env_hint =
183"\n"
184"*** Your name cannot be determined from your system services (gecos).\n"
185"\n"
186"Run\n"
187"\n"
188" git config --global user.email \"you@email.com\"\n"
189" git config --global user.name \"Your Name\"\n"
190"\n"
191"to set your account\'s default identity.\n"
192"Omit --global to set the identity only in this repository.\n"
193"\n";
194
195const char *fmt_ident(const char *name, const char *email,
196 const char *date_str, int error_on_no_name)
197{
198 static char buffer[1000];
199 char date[50];
200 int i;
201
202 setup_ident();
203 if (!name)
204 name = git_default_name;
205 if (!email)
206 email = git_default_email;
207
208 if (!*name) {
209 struct passwd *pw;
210
211 if (0 <= error_on_no_name &&
212 name == git_default_name && env_hint) {
213 fprintf(stderr, env_hint, au_env, co_env);
214 env_hint = NULL; /* warn only once, for "git-var -l" */
215 }
216 if (0 < error_on_no_name)
217 die("empty ident %s <%s> not allowed", name, email);
218 pw = getpwuid(getuid());
219 if (!pw)
220 die("You don't exist. Go away!");
221 strlcpy(git_default_name, pw->pw_name,
222 sizeof(git_default_name));
223 name = git_default_name;
224 }
225
226 strcpy(date, git_default_date);
227 if (date_str) {
228 if (*date_str)
229 parse_date(date_str, date, sizeof(date));
230 else
231 date[0] = '\0';
232 }
233
234 i = copy(buffer, sizeof(buffer), 0, name);
235 i = add_raw(buffer, sizeof(buffer), i, " <");
236 i = copy(buffer, sizeof(buffer), i, email);
237 i = add_raw(buffer, sizeof(buffer), i, date[0] ? "> " : ">");
238 i = copy(buffer, sizeof(buffer), i, date);
239 if (i >= sizeof(buffer))
240 die("Impossibly long personal identifier");
241 buffer[i] = 0;
242 return buffer;
243}
244
245const char *git_author_info(int error_on_no_name)
246{
247 return fmt_ident(getenv("GIT_AUTHOR_NAME"),
248 getenv("GIT_AUTHOR_EMAIL"),
249 getenv("GIT_AUTHOR_DATE"),
250 error_on_no_name);
251}
252
253const char *git_committer_info(int error_on_no_name)
254{
255 return fmt_ident(getenv("GIT_COMMITTER_NAME"),
256 getenv("GIT_COMMITTER_EMAIL"),
257 getenv("GIT_COMMITTER_DATE"),
258 error_on_no_name);
259}