1 files changed, 319 insertions, 0 deletions
diff --git a/ident.c b/ident.c
new file mode 100644
index 0000000000..f619619b82
--- /dev/null
+++ b/ident.c
@@ -0,0 +1,319 @@
+/*
+ * 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
+}