[PATCH 3/3] mingw: use domain information for default email

[Johannes Schindelin via GitGitGadget]

From: Johannes Schindelin <johannes.schinde...@gmx.de>

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.schinde...@gmx.de>
---
 compat/mingw.c    | 5 +++++
 compat/mingw.h    | 2 ++
 git-compat-util.h | 4 ++++
 ident.c           | 3 +++
 4 files changed, 14 insertions(+)

diff --git a/compat/mingw.c b/compat/mingw.c
index 623ff5daf5..44264fe3fd 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1826,6 +1826,11 @@ 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 571019d0bd..f31dcff2be 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -424,6 +424,8 @@ static inline void convert_slashes(char *path)
 int mingw_offset_1st_component(const char *path);
 #define offset_1st_component mingw_offset_1st_component
 #define PATH_SEP ';'
+extern char *mingw_query_user_email(void);
+#define query_user_email mingw_query_user_email
 #if !defined(__MINGW64_VERSION_MAJOR) && (!defined(_MSC_VER) || _MSC_VER < 
1800)
 #define PRIuMAX "I64u"
 #define PRId64 "I64d"
diff --git a/git-compat-util.h b/git-compat-util.h
index 5f2e90932f..71779cb0ae 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -382,6 +382,10 @@ static inline char *git_find_last_dir_sep(const char *path)
 #define find_last_dir_sep git_find_last_dir_sep
 #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 327abe557f..33bcf40644 100644
--- a/ident.c
+++ b/ident.c
@@ -168,6 +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 if ((email = query_user_email()) && email[0]) {
+                       strbuf_addstr(&git_default_email, email);
+                       free((char *)email);
                } else
                        copy_email(xgetpwuid_self(&default_email_is_bogus),
                                   &git_default_email, &default_email_is_bogus);
-- 
gitgitgadget