Make "empty ident" error message a bit more helpful.
[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
10#include <pwd.h>
adc3dbca 11#include <netdb.h>
6aa33f40 12
e1b10391 13static char git_default_date[50];
6aa33f40 14
e9bacb4f
JH
15static 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
925f9187
JH
49static const char au_env[] = "GIT_AUTHOR_NAME";
50static const char co_env[] = "GIT_COMMITTER_NAME";
51static const char env_hint[] =
52"\n*** Environment problem:\n"
53"*** Your name cannot be determined from your system services (gecos).\n"
54"*** You would need to set %s and %s\n"
55"*** environment variables; otherwise you won't be able to perform\n"
56"*** certain operations because of \"empty ident\" errors.\n\n";
57
6aa33f40
LT
58int setup_ident(void)
59{
60 int len;
61 struct passwd *pw = getpwuid(getuid());
62
63 if (!pw)
64 die("You don't exist. Go away!");
65
66 /* Get the name ("gecos") */
e1b10391 67 copy_gecos(pw, git_default_name, sizeof(git_default_name));
6aa33f40 68
925f9187
JH
69 if (!*git_default_name) {
70 if (!getenv(au_env) || !getenv(co_env))
71 fprintf(stderr, env_hint, au_env, co_env);
72 }
73
6aa33f40
LT
74 /* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
75 len = strlen(pw->pw_name);
e1b10391 76 if (len > sizeof(git_default_email)/2)
7a868a84 77 die("Your sysadmin must hate you!");
e1b10391
LT
78 memcpy(git_default_email, pw->pw_name, len);
79 git_default_email[len++] = '@';
80 gethostname(git_default_email + len, sizeof(git_default_email) - len);
81 if (!strchr(git_default_email+len, '.')) {
adc3dbca
PB
82 struct hostent *he = gethostbyname(git_default_email + len);
83 char *domainname;
84
e1b10391
LT
85 len = strlen(git_default_email);
86 git_default_email[len++] = '.';
adc3dbca
PB
87 if (he && (domainname = strchr(he->h_name, '.')))
88 strncpy(git_default_email + len, domainname + 1, sizeof(git_default_email) - len);
89 else
90 strncpy(git_default_email + len, "(none)", sizeof(git_default_email) - len);
91 git_default_email[sizeof(git_default_email) - 1] = 0;
6aa33f40 92 }
6aa33f40 93 /* And set the default date */
e1b10391 94 datestamp(git_default_date, sizeof(git_default_date));
6aa33f40
LT
95 return 0;
96}
97
98static int add_raw(char *buf, int size, int offset, const char *str)
99{
100 int len = strlen(str);
101 if (offset + len > size)
102 return size;
103 memcpy(buf + offset, str, len);
104 return offset + len;
105}
106
107static int crud(unsigned char c)
108{
fb2af037
JR
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 }
6aa33f40
LT
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 */
134static int copy(char *buf, int size, int offset, const char *src)
135{
136 int 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
82f9d58a 157 * characters '\n' '<' and '>' that act as delimiters on
6aa33f40
LT
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
c7d77dab
JH
173static const char *get_ident(const char *name, const char *email,
174 const char *date_str)
6aa33f40
LT
175{
176 static char buffer[1000];
177 char date[50];
178 int i;
179
180 if (!name)
e1b10391 181 name = git_default_name;
6aa33f40 182 if (!email)
e1b10391 183 email = git_default_email;
dfdd309e
JH
184
185 if (!*name || !*email)
186 die("empty ident %s <%s> not allowed",
187 name, email);
188
e1b10391 189 strcpy(date, git_default_date);
6aa33f40
LT
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}
d289d136 203
c7d77dab 204const char *git_author_info(void)
d289d136 205{
c7d77dab
JH
206 return get_ident(getenv("GIT_AUTHOR_NAME"),
207 getenv("GIT_AUTHOR_EMAIL"),
208 getenv("GIT_AUTHOR_DATE"));
d289d136
EB
209}
210
c7d77dab 211const char *git_committer_info(void)
d289d136 212{
c7d77dab
JH
213 return get_ident(getenv("GIT_COMMITTER_NAME"),
214 getenv("GIT_COMMITTER_EMAIL"),
215 getenv("GIT_COMMITTER_DATE"));
d289d136 216}