From 1f0214adee47d55ee34e27797c945b15a9b5e777 Mon Sep 17 00:00:00 2001
From: Taylor Blau <me@ttaylorr.com>
Date: Mon, 18 Jun 2018 19:19:25 -0500
Subject: [PATCH] git/attribs.go: consider system attribute paths

---
 commands/command_track.go |  1 +
 git/attribs.go            | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/commands/command_track.go b/commands/command_track.go
index 5077c9fb..94a43c08 100644
--- a/commands/command_track.go
+++ b/commands/command_track.go
@@ -231,6 +231,7 @@ func listPatterns() {
 func getAllKnownPatterns() []git.AttributePath {
 	knownPatterns := git.GetAttributePaths(cfg.LocalWorkingDir(), cfg.LocalGitDir())
 	knownPatterns = append(knownPatterns, git.GetRootAttributePaths(cfg.Git)...)
+	knownPatterns = append(knownPatterns, git.GetSystemAttributePaths(cfg.Os)...)
 
 	return knownPatterns
 }
diff --git a/git/attribs.go b/git/attribs.go
index 0f80e829..6a033b55 100644
--- a/git/attribs.go
+++ b/git/attribs.go
@@ -47,6 +47,24 @@ func GetRootAttributePaths(cfg Env) []AttributePath {
 	return attrPaths(af, "")
 }
 
+// GetSystemAttributePaths behaves as GetAttributePaths, and loads information
+// only from the system gitattributes file, respecting the $PREFIX environment
+// variable.
+func GetSystemAttributePaths(env Env) []AttributePath {
+	prefix, _ := env.Get("PREFIX")
+	if len(prefix) == 0 {
+		prefix = string(filepath.Separator)
+	}
+
+	path := filepath.Join(prefix, "etc", "gitattributes")
+
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return nil
+	}
+
+	return attrPaths(path, "")
+}
+
 // GetAttributePaths returns a list of entries in .gitattributes which are
 // configured with the filter=lfs attribute
 // workingDir is the root of the working copy