summaryrefslogtreecommitdiff
path: root/ident.c
blob: f619619b82379c2d205c7d7ea101049e373ab90a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
/*
 * ident.c
 *
 * create git identifier lines of the form "name <email> date"
 *
 * Copyright (C) 2005 Linus Torvalds
 */
#include "cache.h"

static char git_default_date[50];

#ifdef NO_GECOS_IN_PWENT
#define get_gecos(ignored) "&"
#else
#define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
#endif

static void copy_gecos(const struct passwd *w, char *name, size_t sz)
{
	char *src, *dst;
	size_t len, nlen;

	nlen = strlen(w->pw_name);

	/* Traditionally GECOS field had office phone numbers etc, separated
	 * with commas.  Also & stands for capitalized form of the login name.
	 */

	for (len = 0, dst = name, src = get_gecos(w); len < sz; src++) {
		int ch = *src;
		if (ch != '&') {
			*dst++ = ch;
			if (ch == 0 || ch == ',')
				break;
			len++;
			continue;
		}
		if (len + nlen < sz) {
			/* Sorry, Mr. McDonald... */
			*dst++ = toupper(*w->pw_name);
			memcpy(dst, w->pw_name + 1, nlen - 1);
			dst += nlen - 1;
			len += nlen;
		}
	}
	if (len < sz)
		name[len] = 0;
	else
		die("Your parents must have hated you!");

}

static int add_mailname_host(char *buf, size_t len)
{
	FILE *mailname;

	mailname = fopen("/etc/mailname", "r");
	if (!mailname) {
		if (errno != ENOENT)
			warning("cannot open /etc/mailname: %s",
				strerror(errno));
		return -1;
	}
	if (!fgets(buf, len, mailname)) {
		if (ferror(mailname))
			warning("cannot read /etc/mailname: %s",
				strerror(errno));
		fclose(mailname);
		return -1;
	}
	/* success! */
	fclose(mailname);
	return 0;
}

static void add_domainname(char *buf, size_t len)
{
	struct hostent *he;
	size_t namelen;
	const char *domainname;

	if (gethostname(buf, len)) {
		warning("cannot get host name: %s", strerror(errno));
		strlcpy(buf, "(none)", len);
		return;
	}
	namelen = strlen(buf);
	if (memchr(buf, '.', namelen))
		return;

	he = gethostbyname(buf);
	buf[namelen++] = '.';
	buf += namelen;
	len -= namelen;
	if (he && (domainname = strchr(he->h_name, '.')))
		strlcpy(buf, domainname + 1, len);
	else
		strlcpy(buf, "(none)", len);
}

static void copy_email(const struct passwd *pw)
{
	/*
	 * Make up a fake email address
	 * (name + '@' + hostname [+ '.' + domainname])
	 */
	size_t len = strlen(pw->pw_name);
	if (len > sizeof(git_default_email)/2)
		die("Your sysadmin must hate you!");
	memcpy(git_default_email, pw->pw_name, len);
	git_default_email[len++] = '@';

	if (!add_mailname_host(git_default_email + len,
				sizeof(git_default_email) - len))
		return;	/* read from "/etc/mailname" (Debian) */
	add_domainname(git_default_email + len,
			sizeof(git_default_email) - len);
}

static void setup_ident(const char **name, const char **emailp)
{
	struct passwd *pw = NULL;

	/* Get the name ("gecos") */
	if (!*name && !git_default_name[0]) {
		pw = getpwuid(getuid());
		if (!pw)
			die("You don't exist. Go away!");
		copy_gecos(pw, git_default_name, sizeof(git_default_name));
	}
	if (!*name)
		*name = git_default_name;

	if (!*emailp && !git_default_email[0]) {
		const char *email = getenv("EMAIL");

		if (email && email[0]) {
			strlcpy(git_default_email, email,
				sizeof(git_default_email));
			user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
		} else {
			if (!pw)
				pw = getpwuid(getuid());
			if (!pw)
				die("You don't exist. Go away!");
			copy_email(pw);
		}
	}
	if (!*emailp)
		*emailp = git_default_email;

	/* And set the default date */
	if (!git_default_date[0])
		datestamp(git_default_date, sizeof(git_default_date));
}

static int add_raw(char *buf, size_t size, int offset, const char *str)
{
	size_t len = strlen(str);
	if (offset + len > size)
		return size;
	memcpy(buf + offset, str, len);
	return offset + len;
}

static int crud(unsigned char c)
{
	return  c <= 32  ||
		c == '.' ||
		c == ',' ||
		c == ':' ||
		c == ';' ||
		c == '<' ||
		c == '>' ||
		c == '"' ||
		c == '\\' ||
		c == '\'';
}

/*
 * Copy over a string to the destination, but avoid special
 * characters ('\n', '<' and '>') and remove crud at the end
 */
static int copy(char *buf, size_t size, int offset, const char *src)
{
	size_t i, len;
	unsigned char c;

	/* Remove crud from the beginning.. */
	while ((c = *src) != 0) {
		if (!crud(c))
			break;
		src++;
	}

	/* Remove crud from the end.. */
	len = strlen(src);
	while (len > 0) {
		c = src[len-1];
		if (!crud(c))
			break;
		--len;
	}

	/*
	 * Copy the rest to the buffer, but avoid the special
	 * characters '\n' '<' and '>' that act as delimiters on
	 * an identification line
	 */
	for (i = 0; i < len; i++) {
		c = *src++;
		switch (c) {
		case '\n': case '<': case '>':
			continue;
		}
		if (offset >= size)
			return size;
		buf[offset++] = c;
	}
	return offset;
}

static const char *env_hint =
"\n"
"*** Please tell me who you are.\n"
"\n"
"Run\n"
"\n"
"  git config --global user.email \"you@example.com\"\n"
"  git config --global user.name \"Your Name\"\n"
"\n"
"to set your account\'s default identity.\n"
"Omit --global to set the identity only in this repository.\n"
"\n";

const char *fmt_ident(const char *name, const char *email,
		      const char *date_str, int flag)
{
	static char buffer[1000];
	char date[50];
	int i;
	int error_on_no_name = (flag & IDENT_ERROR_ON_NO_NAME);
	int warn_on_no_name = (flag & IDENT_WARN_ON_NO_NAME);
	int name_addr_only = (flag & IDENT_NO_DATE);

	setup_ident(&name, &email);

	if (!*name) {
		struct passwd *pw;

		if ((warn_on_no_name || error_on_no_name) &&
		    name == git_default_name && env_hint) {
			fputs(env_hint, stderr);
			env_hint = NULL; /* warn only once */
		}
		if (error_on_no_name)
			die("empty ident %s <%s> not allowed", name, email);
		pw = getpwuid(getuid());
		if (!pw)
			die("You don't exist. Go away!");
		strlcpy(git_default_name, pw->pw_name,
			sizeof(git_default_name));
		name = git_default_name;
	}

	strcpy(date, git_default_date);
	if (!name_addr_only && date_str && date_str[0]) {
		if (parse_date(date_str, date, sizeof(date)) < 0)
			die("invalid date format: %s", date_str);
	}

	i = copy(buffer, sizeof(buffer), 0, name);
	i = add_raw(buffer, sizeof(buffer), i, " <");
	i = copy(buffer, sizeof(buffer), i, email);
	if (!name_addr_only) {
		i = add_raw(buffer, sizeof(buffer), i,  "> ");
		i = copy(buffer, sizeof(buffer), i, date);
	} else {
		i = add_raw(buffer, sizeof(buffer), i, ">");
	}
	if (i >= sizeof(buffer))
		die("Impossibly long personal identifier");
	buffer[i] = 0;
	return buffer;
}

const char *fmt_name(const char *name, const char *email)
{
	return fmt_ident(name, email, NULL, IDENT_ERROR_ON_NO_NAME | IDENT_NO_DATE);
}

const char *git_author_info(int flag)
{
	return fmt_ident(getenv("GIT_AUTHOR_NAME"),
			 getenv("GIT_AUTHOR_EMAIL"),
			 getenv("GIT_AUTHOR_DATE"),
			 flag);
}

const char *git_committer_info(int flag)
{
	if (getenv("GIT_COMMITTER_NAME"))
		user_ident_explicitly_given |= IDENT_NAME_GIVEN;
	if (getenv("GIT_COMMITTER_EMAIL"))
		user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
	return fmt_ident(getenv("GIT_COMMITTER_NAME"),
			 getenv("GIT_COMMITTER_EMAIL"),
			 getenv("GIT_COMMITTER_DATE"),
			 flag);
}

int user_ident_sufficiently_given(void)
{
#ifndef WINDOWS
	return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
#else
	return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
#endif
}