From 08d7ab195fd4a9807a1cd69ea01591dfa30afd3c Mon Sep 17 00:00:00 2001
From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Tue, 13 Oct 2015 10:36:52 +0000
Subject: [PATCH] mingw: use domain information for default email

When a user is registered in a Windows domain, it is really easy to
obtain the email address. So let's do that.

Suggested by Lutz Roeder.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 compat/mingw.c    | 5 +++++
 compat/mingw.h    | 2 ++
 git-compat-util.h | 4 ++++
 ident.c           | 4 +++-
 4 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/compat/mingw.c b/compat/mingw.c
index 3510ed378f..07e8a09bfa 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1856,6 +1856,11 @@ static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
 	return NULL;
 }
 
+char *mingw_query_user_email(void)
+{
+	return get_extended_user_info(NameUserPrincipal);
+}
+
 struct passwd *getpwuid(int uid)
 {
 	static unsigned initialized;
diff --git a/compat/mingw.h b/compat/mingw.h
index f8a2969658..48d2e9e574 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -422,6 +422,8 @@ int mingw_offset_1st_component(const char *path);
 #define PATH_SEP ';'
 extern const char *program_data_config(void);
 #define git_program_data_config program_data_config
+extern char *mingw_query_user_email(void);
+#define query_user_email mingw_query_user_email
 #ifndef __MINGW64_VERSION_MAJOR
 #define PRIuMAX "I64u"
 #define PRId64 "I64d"
diff --git a/git-compat-util.h b/git-compat-util.h
index 0deb1c4c33..f50c5e824a 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -379,6 +379,10 @@ static inline char *git_find_last_dir_sep(const char *path)
 #define git_program_data_config() NULL
 #endif
 
+#ifndef query_user_email
+#define query_user_email() NULL
+#endif
+
 #if defined(__HP_cc) && (__HP_cc >= 61000)
 #define NORETURN __attribute__((noreturn))
 #define NORETURN_PTR
diff --git a/ident.c b/ident.c
index daf7e1ea83..2400263a7c 100644
--- a/ident.c
+++ b/ident.c
@@ -168,7 +168,9 @@ const char *ident_default_email(void)
 			strbuf_addstr(&git_default_email, email);
 			committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 			author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
-		} else
+		} else if ((email = query_user_email()) && email[0])
+			strbuf_addstr(&git_default_email, email);
+		else
 			copy_email(xgetpwuid_self(&default_email_is_bogus),
 				   &git_default_email, &default_email_is_bogus);
 		strbuf_trim(&git_default_email);