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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 | static 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 | ||
46 | static 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 | ||
73 | static 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 | if (!pw) | |
87 | pw = getpwuid(getuid()); | |
88 | if (!pw) | |
89 | die("You don't exist. Go away!"); | |
90 | copy_email(pw); | |
91 | } | |
92 | ||
93 | /* And set the default date */ | |
94 | if (!git_default_date[0]) | |
95 | datestamp(git_default_date, sizeof(git_default_date)); | |
96 | } | |
97 | ||
98 | static int add_raw(char *buf, size_t size, int offset, const char *str) | |
99 | { | |
100 | size_t len = strlen(str); | |
101 | if (offset + len > size) | |
102 | return size; | |
103 | memcpy(buf + offset, str, len); | |
104 | return offset + len; | |
105 | } | |
106 | ||
107 | static int crud(unsigned char c) | |
108 | { | |
109 | static char crud_array[256]; | |
110 | static int crud_array_initialized = 0; | |
111 | ||
112 | if (!crud_array_initialized) { | |
113 | int k; | |
114 | ||
115 | for (k = 0; k <= 31; ++k) crud_array[k] = 1; | |
116 | crud_array[' '] = 1; | |
117 | crud_array['.'] = 1; | |
118 | crud_array[','] = 1; | |
119 | crud_array[':'] = 1; | |
120 | crud_array[';'] = 1; | |
121 | crud_array['<'] = 1; | |
122 | crud_array['>'] = 1; | |
123 | crud_array['"'] = 1; | |
124 | crud_array['\''] = 1; | |
125 | crud_array_initialized = 1; | |
126 | } | |
127 | return crud_array[c]; | |
128 | } | |
129 | ||
130 | /* | |
131 | * Copy over a string to the destination, but avoid special | |
132 | * characters ('\n', '<' and '>') and remove crud at the end | |
133 | */ | |
134 | static int copy(char *buf, size_t size, int offset, const char *src) | |
135 | { | |
136 | size_t i, len; | |
137 | unsigned char c; | |
138 | ||
139 | /* Remove crud from the beginning.. */ | |
140 | while ((c = *src) != 0) { | |
141 | if (!crud(c)) | |
142 | break; | |
143 | src++; | |
144 | } | |
145 | ||
146 | /* Remove crud from the end.. */ | |
147 | len = strlen(src); | |
148 | while (len > 0) { | |
149 | c = src[len-1]; | |
150 | if (!crud(c)) | |
151 | break; | |
152 | --len; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Copy the rest to the buffer, but avoid the special | |
157 | * characters '\n' '<' and '>' that act as delimiters on | |
158 | * a identification line | |
159 | */ | |
160 | for (i = 0; i < len; i++) { | |
161 | c = *src++; | |
162 | switch (c) { | |
163 | case '\n': case '<': case '>': | |
164 | continue; | |
165 | } | |
166 | if (offset >= size) | |
167 | return size; | |
168 | buf[offset++] = c; | |
169 | } | |
170 | return offset; | |
171 | } | |
172 | ||
173 | static const char au_env[] = "GIT_AUTHOR_NAME"; | |
174 | static const char co_env[] = "GIT_COMMITTER_NAME"; | |
175 | static const char *env_hint = | |
176 | "\n" | |
177 | "*** Your name cannot be determined from your system services (gecos).\n" | |
178 | "\n" | |
179 | "Run\n" | |
180 | "\n" | |
181 | " git config user.email \"you@email.com\"\n" | |
182 | " git config user.name \"Your Name\"\n" | |
183 | "\n" | |
184 | "To set the identity in this repository.\n" | |
185 | "Add --global to set your account\'s default\n" | |
186 | "\n"; | |
187 | ||
188 | const char *fmt_ident(const char *name, const char *email, | |
189 | const char *date_str, int error_on_no_name) | |
190 | { | |
191 | static char buffer[1000]; | |
192 | char date[50]; | |
193 | int i; | |
194 | ||
195 | setup_ident(); | |
196 | if (!name) | |
197 | name = git_default_name; | |
198 | if (!email) | |
199 | email = git_default_email; | |
200 | if (!email) | |
201 | email = getenv("EMAIL"); | |
202 | ||
203 | if (!*name) { | |
204 | struct passwd *pw; | |
205 | ||
206 | if (0 <= error_on_no_name && | |
207 | name == git_default_name && env_hint) { | |
208 | fprintf(stderr, env_hint, au_env, co_env); | |
209 | env_hint = NULL; /* warn only once, for "git-var -l" */ | |
210 | } | |
211 | if (0 < error_on_no_name) | |
212 | die("empty ident %s <%s> not allowed", name, email); | |
213 | pw = getpwuid(getuid()); | |
214 | if (!pw) | |
215 | die("You don't exist. Go away!"); | |
216 | strlcpy(git_default_name, pw->pw_name, | |
217 | sizeof(git_default_name)); | |
218 | name = git_default_name; | |
219 | } | |
220 | ||
221 | strcpy(date, git_default_date); | |
222 | if (date_str) | |
223 | parse_date(date_str, date, sizeof(date)); | |
224 | ||
225 | i = copy(buffer, sizeof(buffer), 0, name); | |
226 | i = add_raw(buffer, sizeof(buffer), i, " <"); | |
227 | i = copy(buffer, sizeof(buffer), i, email); | |
228 | i = add_raw(buffer, sizeof(buffer), i, "> "); | |
229 | i = copy(buffer, sizeof(buffer), i, date); | |
230 | if (i >= sizeof(buffer)) | |
231 | die("Impossibly long personal identifier"); | |
232 | buffer[i] = 0; | |
233 | return buffer; | |
234 | } | |
235 | ||
236 | const char *git_author_info(int error_on_no_name) | |
237 | { | |
238 | return fmt_ident(getenv("GIT_AUTHOR_NAME"), | |
239 | getenv("GIT_AUTHOR_EMAIL"), | |
240 | getenv("GIT_AUTHOR_DATE"), | |
241 | error_on_no_name); | |
242 | } | |
243 | ||
244 | const char *git_committer_info(int error_on_no_name) | |
245 | { | |
246 | return fmt_ident(getenv("GIT_COMMITTER_NAME"), | |
247 | getenv("GIT_COMMITTER_EMAIL"), | |
248 | getenv("GIT_COMMITTER_DATE"), | |
249 | error_on_no_name); | |
250 | } |