ident: check /etc/mailname if email is unknown

[git.git] / ident.c

diff --git a/ident.c b/ident.c
index 8e56b5e941e85c9634d420a3e8140c328bca9c30..edb4314494c421278f5d69bf69df5f7efde8e68a 100644 (file)
--- a/ident.c
+++ b/ident.c
@@ -9,6 +9,12 @@
 
 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;
@@ -20,7 +26,7 @@ static void copy_gecos(const struct passwd *w, char *name, size_t sz)
         * with commas.  Also & stands for capitalized form of the login name.
         */
 
-       for (len = 0, dst = name, src = w->pw_gecos; len < sz; src++) {
+       for (len = 0, dst = name, src = get_gecos(w); len < sz; src++) {
                int ch = *src;
                if (ch != '&') {
                        *dst++ = ch;
@@ -44,6 +50,54 @@ static void copy_gecos(const struct passwd *w, char *name, size_t sz)
 
 }
 
+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)
 {
        /*
@@ -55,20 +109,12 @@ static void copy_email(const struct passwd *pw)
                die("Your sysadmin must hate you!");
        memcpy(git_default_email, pw->pw_name, len);
        git_default_email[len++] = '@';
-       gethostname(git_default_email + len, sizeof(git_default_email) - len);
-       if (!strchr(git_default_email+len, '.')) {
-               struct hostent *he = gethostbyname(git_default_email + len);
-               char *domainname;
-
-               len = strlen(git_default_email);
-               git_default_email[len++] = '.';
-               if (he && (domainname = strchr(he->h_name, '.')))
-                       strlcpy(git_default_email + len, domainname + 1,
-                               sizeof(git_default_email) - len);
-               else
-                       strlcpy(git_default_email + len, "(none)",
-                               sizeof(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(void)