7b44cbd2cc54c049518b9fb1cb681a88c7aaa6c4
[git/git.git] / ident.c
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 #include <pwd.h>
11 #include <netdb.h>
12
13 static char git_default_date[50];
14
15 static void copy_gecos(struct passwd *w, char *name, int sz)
16 {
17 char *src, *dst;
18 int len, nlen;
19
20 nlen = strlen(w->pw_name);
21
22 /* Traditionally GECOS field had office phone numbers etc, separated
23 * with commas. Also & stands for capitalized form of the login name.
24 */
25
26 for (len = 0, dst = name, src = w->pw_gecos; len < sz; src++) {
27 int ch = *src;
28 if (ch != '&') {
29 *dst++ = ch;
30 if (ch == 0 || ch == ',')
31 break;
32 len++;
33 continue;
34 }
35 if (len + nlen < sz) {
36 /* Sorry, Mr. McDonald... */
37 *dst++ = toupper(*w->pw_name);
38 memcpy(dst, w->pw_name + 1, nlen - 1);
39 dst += nlen - 1;
40 }
41 }
42 if (len < sz)
43 name[len] = 0;
44 else
45 die("Your parents must have hated you!");
46
47 }
48
49 int setup_ident(void)
50 {
51 int len;
52 struct passwd *pw = getpwuid(getuid());
53
54 if (!pw)
55 die("You don't exist. Go away!");
56
57 /* Get the name ("gecos") */
58 copy_gecos(pw, git_default_name, sizeof(git_default_name));
59
60 /* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
61 len = strlen(pw->pw_name);
62 if (len > sizeof(git_default_email)/2)
63 die("Your sysadmin must hate you!");
64 memcpy(git_default_email, pw->pw_name, len);
65 git_default_email[len++] = '@';
66 gethostname(git_default_email + len, sizeof(git_default_email) - len);
67 if (!strchr(git_default_email+len, '.')) {
68 struct hostent *he = gethostbyname(git_default_email + len);
69 char *domainname;
70
71 len = strlen(git_default_email);
72 git_default_email[len++] = '.';
73 if (he && (domainname = strchr(he->h_name, '.')))
74 safe_strncpy(git_default_email + len, domainname + 1, sizeof(git_default_email) - len);
75 else
76 safe_strncpy(git_default_email + len, "(none)", sizeof(git_default_email) - len);
77 }
78 /* And set the default date */
79 datestamp(git_default_date, sizeof(git_default_date));
80 return 0;
81 }
82
83 static int add_raw(char *buf, int size, int offset, const char *str)
84 {
85 int len = strlen(str);
86 if (offset + len > size)
87 return size;
88 memcpy(buf + offset, str, len);
89 return offset + len;
90 }
91
92 static int crud(unsigned char c)
93 {
94 static char crud_array[256];
95 static int crud_array_initialized = 0;
96
97 if (!crud_array_initialized) {
98 int k;
99
100 for (k = 0; k <= 31; ++k) crud_array[k] = 1;
101 crud_array[' '] = 1;
102 crud_array['.'] = 1;
103 crud_array[','] = 1;
104 crud_array[':'] = 1;
105 crud_array[';'] = 1;
106 crud_array['<'] = 1;
107 crud_array['>'] = 1;
108 crud_array['"'] = 1;
109 crud_array['\''] = 1;
110 crud_array_initialized = 1;
111 }
112 return crud_array[c];
113 }
114
115 /*
116 * Copy over a string to the destination, but avoid special
117 * characters ('\n', '<' and '>') and remove crud at the end
118 */
119 static int copy(char *buf, int size, int offset, const char *src)
120 {
121 int i, len;
122 unsigned char c;
123
124 /* Remove crud from the beginning.. */
125 while ((c = *src) != 0) {
126 if (!crud(c))
127 break;
128 src++;
129 }
130
131 /* Remove crud from the end.. */
132 len = strlen(src);
133 while (len > 0) {
134 c = src[len-1];
135 if (!crud(c))
136 break;
137 --len;
138 }
139
140 /*
141 * Copy the rest to the buffer, but avoid the special
142 * characters '\n' '<' and '>' that act as delimiters on
143 * a identification line
144 */
145 for (i = 0; i < len; i++) {
146 c = *src++;
147 switch (c) {
148 case '\n': case '<': case '>':
149 continue;
150 }
151 if (offset >= size)
152 return size;
153 buf[offset++] = c;
154 }
155 return offset;
156 }
157
158 static const char au_env[] = "GIT_AUTHOR_NAME";
159 static const char co_env[] = "GIT_COMMITTER_NAME";
160 static const char *env_hint =
161 "\n*** Environment problem:\n"
162 "*** Your name cannot be determined from your system services (gecos).\n"
163 "*** You would need to set %s and %s\n"
164 "*** environment variables; otherwise you won't be able to perform\n"
165 "*** certain operations because of \"empty ident\" errors.\n"
166 "*** Alternatively, you can use user.name configuration variable.\n\n";
167
168 static const char *get_ident(const char *name, const char *email,
169 const char *date_str, int error_on_no_name)
170 {
171 static char buffer[1000];
172 char date[50];
173 int i;
174
175 if (!name)
176 name = git_default_name;
177 if (!email)
178 email = git_default_email;
179
180 if (!*name) {
181 if (name == git_default_name && env_hint) {
182 fprintf(stderr, env_hint, au_env, co_env);
183 env_hint = NULL; /* warn only once, for "git-var -l" */
184 }
185 if (error_on_no_name)
186 die("empty ident %s <%s> not allowed", name, email);
187 }
188
189 strcpy(date, git_default_date);
190 if (date_str)
191 parse_date(date_str, date, sizeof(date));
192
193 i = copy(buffer, sizeof(buffer), 0, name);
194 i = add_raw(buffer, sizeof(buffer), i, " <");
195 i = copy(buffer, sizeof(buffer), i, email);
196 i = add_raw(buffer, sizeof(buffer), i, "> ");
197 i = copy(buffer, sizeof(buffer), i, date);
198 if (i >= sizeof(buffer))
199 die("Impossibly long personal identifier");
200 buffer[i] = 0;
201 return buffer;
202 }
203
204 const char *git_author_info(int error_on_no_name)
205 {
206 return get_ident(getenv("GIT_AUTHOR_NAME"),
207 getenv("GIT_AUTHOR_EMAIL"),
208 getenv("GIT_AUTHOR_DATE"),
209 error_on_no_name);
210 }
211
212 const char *git_committer_info(int error_on_no_name)
213 {
214 return get_ident(getenv("GIT_COMMITTER_NAME"),
215 getenv("GIT_COMMITTER_EMAIL"),
216 getenv("GIT_COMMITTER_DATE"),
217 error_on_no_name);
218 }