Merge branch 'maint'

* maint:
  git-gui: Ensure .git/info/exclude is honored in Cygwin workdirs
  git-gui: Handle starting on mapped shares under Cygwin
  git-gui: Display message box when we cannot find git in $PATH

Conflicts:

	git-gui.sh

git-gui.sh

@@ -335,7 +335,7 @@ proc _which {what} {
 	global env _search_exe _search_path
 
 	if {$_search_path eq {}} {
-		if {[is_Cygwin]} {
+		if {[is_Cygwin] && [regexp {^(/|\.:)} $env(PATH)]} {
 			set _search_path [split [exec cygpath \
 				--windows \
 				--path \
@@ -528,7 +528,11 @@ proc rmsel_tag {text} {
 set _git  [_which git]
 if {$_git eq {}} {
 	catch {wm withdraw .}
-	error_popup [mc "Cannot find git in PATH."]
+	tk_messageBox \
+		-icon error \
+		-type ok \
+		-title [mc "git-gui: fatal error"] \
+		-message [mc "Cannot find git in PATH."]
 	exit 1
 }
 
@@ -924,6 +928,35 @@ proc rescan {after {honor_trustmtime 1}} {
 	}
 }
 
+if {[is_Cygwin]} {
+	set is_git_info_link {}
+	set is_git_info_exclude {}
+	proc have_info_exclude {} {
+		global is_git_info_link is_git_info_exclude
+
+		if {$is_git_info_link eq {}} {
+			set is_git_info_link [file isfile [gitdir info.lnk]]
+		}
+
+		if {$is_git_info_link} {
+			if {$is_git_info_exclude eq {}} {
+				if {[catch {exec test -f [gitdir info exclude]}]} {
+					set is_git_info_exclude 0
+				} else {
+					set is_git_info_exclude 1
+				}
+			}
+			return $is_git_info_exclude
+		} else {
+			return [file readable [gitdir info exclude]]
+		}
+	}
+} else {
+	proc have_info_exclude {} {
+		return [file readable [gitdir info exclude]]
+	}
+}
+
 proc rescan_stage2 {fd after} {
 	global rescan_active buf_rdi buf_rdf buf_rlo
 
@@ -934,9 +967,8 @@ proc rescan_stage2 {fd after} {
 	}
 
 	set ls_others [list --exclude-per-directory=.gitignore]
-	set info_exclude [gitdir info exclude]
+	if {[have_info_exclude]} {
-	if {[file readable $info_exclude]} {
+		lappend ls_others "--exclude-from=[gitdir info exclude]"
-		lappend ls_others "--exclude-from=$info_exclude"
 	}
 	set user_exclude [get_config core.excludesfile]
 	if {$user_exclude ne {} && [file readable $user_exclude]} {