git-commit: clean up die messages
[git/git.git] / ident.c
CommitLineData
6aa33f40
LT
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
e1b10391 10static char git_default_date[50];
6aa33f40 11
b0732115 12static void copy_gecos(const struct passwd *w, char *name, size_t sz)
e9bacb4f
JH
13{
14 char *src, *dst;
b0732115 15 size_t len, nlen;
e9bacb4f
JH
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
0b952a98 46static void copy_email(const struct passwd *pw)
6aa33f40 47{
01754769
JH
48 /*
49 * Make up a fake email address
50 * (name + '@' + hostname [+ '.' + domainname])
51 */
b0732115 52 size_t len = strlen(pw->pw_name);
e1b10391 53 if (len > sizeof(git_default_email)/2)
7a868a84 54 die("Your sysadmin must hate you!");
e1b10391
LT
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, '.')) {
adc3dbca
PB
59 struct hostent *he = gethostbyname(git_default_email + len);
60 char *domainname;
61
e1b10391
LT
62 len = strlen(git_default_email);
63 git_default_email[len++] = '.';
adc3dbca 64 if (he && (domainname = strchr(he->h_name, '.')))
01754769
JH
65 strlcpy(git_default_email + len, domainname + 1,
66 sizeof(git_default_email) - len);
adc3dbca 67 else
01754769
JH
68 strlcpy(git_default_email + len, "(none)",
69 sizeof(git_default_email) - len);
6aa33f40 70 }
01754769
JH
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]) {
46f74f00
MK
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 }
01754769
JH
98 }
99
6aa33f40 100 /* And set the default date */
01754769
JH
101 if (!git_default_date[0])
102 datestamp(git_default_date, sizeof(git_default_date));
6aa33f40
LT
103}
104
b0732115 105static int add_raw(char *buf, size_t size, int offset, const char *str)
6aa33f40 106{
b0732115 107 size_t len = strlen(str);
6aa33f40
LT
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{
fb2af037
JR
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 }
6aa33f40
LT
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 */
b0732115 141static int copy(char *buf, size_t size, int offset, const char *src)
6aa33f40 142{
b0732115 143 size_t i, len;
6aa33f40
LT
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
82f9d58a 164 * characters '\n' '<' and '>' that act as delimiters on
6aa33f40
LT
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
749be728
JH
180static const char au_env[] = "GIT_AUTHOR_NAME";
181static const char co_env[] = "GIT_COMMITTER_NAME";
182static const char *env_hint =
d5cc2de9 183"\n"
749be728 184"*** Your name cannot be determined from your system services (gecos).\n"
d5cc2de9
HWN
185"\n"
186"Run\n"
187"\n"
180787c4
SP
188" git config --global user.email \"you@email.com\"\n"
189" git config --global user.name \"Your Name\"\n"
d5cc2de9 190"\n"
180787c4
SP
191"to set your account\'s default identity.\n"
192"Omit --global to set the identity only in this repository.\n"
d5cc2de9 193"\n";
749be728 194
798123af
JH
195const char *fmt_ident(const char *name, const char *email,
196 const char *date_str, int error_on_no_name)
6aa33f40
LT
197{
198 static char buffer[1000];
199 char date[50];
200 int i;
201
01754769 202 setup_ident();
6aa33f40 203 if (!name)
e1b10391 204 name = git_default_name;
6aa33f40 205 if (!email)
e1b10391 206 email = git_default_email;
dfdd309e 207
749be728 208 if (!*name) {
cb280e10
JH
209 struct passwd *pw;
210
211 if (0 <= error_on_no_name &&
212 name == git_default_name && env_hint) {
749be728
JH
213 fprintf(stderr, env_hint, au_env, co_env);
214 env_hint = NULL; /* warn only once, for "git-var -l" */
215 }
cb280e10 216 if (0 < error_on_no_name)
749be728 217 die("empty ident %s <%s> not allowed", name, email);
cb280e10
JH
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;
749be728 224 }
dfdd309e 225
e1b10391 226 strcpy(date, git_default_date);
13208572
JS
227 if (date_str) {
228 if (*date_str)
229 parse_date(date_str, date, sizeof(date));
230 else
231 date[0] = '\0';
232 }
6aa33f40
LT
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);
13208572 237 i = add_raw(buffer, sizeof(buffer), i, date[0] ? "> " : ">");
6aa33f40
LT
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}
d289d136 244
749be728 245const char *git_author_info(int error_on_no_name)
d289d136 246{
798123af 247 return fmt_ident(getenv("GIT_AUTHOR_NAME"),
c7d77dab 248 getenv("GIT_AUTHOR_EMAIL"),
749be728
JH
249 getenv("GIT_AUTHOR_DATE"),
250 error_on_no_name);
d289d136
EB
251}
252
749be728 253const char *git_committer_info(int error_on_no_name)
d289d136 254{
798123af 255 return fmt_ident(getenv("GIT_COMMITTER_NAME"),
c7d77dab 256 getenv("GIT_COMMITTER_EMAIL"),
749be728
JH
257 getenv("GIT_COMMITTER_DATE"),
258 error_on_no_name);
d289d136 259}