thodg/libgit2

diff --git a/src/attr.c b/src/attr.c
index 50caa1e..4993e3a 100644
--- a/src/attr.c
+++ b/src/attr.c
@@ -261,13 +261,13 @@ bool git_attr_cache__is_cached(
 
 static int load_attr_file(
 	const char **data,
-	git_futils_stat_sig *sig,
+	git_futils_file_stamp *stamp,
 	const char *filename)
 {
 	int error;
 	git_buf content = GIT_BUF_INIT;
 
-	error = git_futils_stat_sig_needs_reload(sig, filename);
+	error = git_futils_file_stamp_has_changed(stamp, filename);
 	if (error < 0)
 		return error;
 
@@ -380,7 +380,7 @@ int git_attr_cache__push_file(
 	git_attr_cache *cache = git_repository_attr_cache(repo);
 	git_attr_file *file = NULL;
 	git_blob *blob = NULL;
-	git_futils_stat_sig sig;
+	git_futils_file_stamp stamp;
 
 	assert(filename && stack);
 
@@ -402,12 +402,10 @@ int git_attr_cache__push_file(
 	/* if not in cache, load data, parse, and cache */
 
 	if (source == GIT_ATTR_FILE_FROM_FILE) {
-		if (file)
-			memcpy(&sig, &file->cache_data.sig, sizeof(sig));
-		else
-			memset(&sig, 0, sizeof(sig));
+		git_futils_file_stamp_set(
+			&stamp, file ? &file->cache_data.stamp : NULL);
 
-		error = load_attr_file(&content, &sig, filename);
+		error = load_attr_file(&content, &stamp, filename);
 	} else {
 		error = load_attr_blob_from_index(&content, &blob,
 			repo, file ? &file->cache_data.oid : NULL, relfile);
@@ -442,7 +440,7 @@ int git_attr_cache__push_file(
 	if (blob)
 		git_oid_cpy(&file->cache_data.oid, git_object_id((git_object *)blob));
 	else
-		memcpy(&file->cache_data.sig, &sig, sizeof(sig));
+		git_futils_file_stamp_set(&file->cache_data.stamp, &stamp);
 
 finish:
 	/* push file onto vector if we found one*/
diff --git a/src/attr_file.h b/src/attr_file.h
index ecd6486..7f6932f 100644
--- a/src/attr_file.h
+++ b/src/attr_file.h
@@ -61,7 +61,7 @@ typedef struct {
 	bool pool_is_allocated;
 	union {
 		git_oid oid;
-		git_futils_stat_sig sig;
+		git_futils_file_stamp stamp;
 	} cache_data;
 } git_attr_file;
 
diff --git a/src/fileops.c b/src/fileops.c
index c22622c..524ba4e 100644
--- a/src/fileops.c
+++ b/src/fileops.c
@@ -671,27 +671,37 @@ int git_futils_cp_r(
 	return error;
 }
 
-int git_futils_stat_sig_needs_reload(
-	git_futils_stat_sig *sig, const char *path)
+int git_futils_file_stamp_has_changed(
+	git_futils_file_stamp *stamp, const char *path)
 {
 	struct stat st;
 
-	/* if the sig is NULL, then alway reload */
-	if (sig == NULL)
+	/* if the stamp is NULL, then always reload */
+	if (stamp == NULL)
 		return 1;
 
 	if (p_stat(path, &st) < 0)
 		return GIT_ENOTFOUND;
 
-	if ((git_time_t)st.st_mtime == sig->seconds &&
-		(git_off_t)st.st_size == sig->size &&
-		(unsigned int)st.st_ino == sig->ino)
+	if (stamp->mtime == (git_time_t)st.st_mtime &&
+		stamp->size  == (git_off_t)st.st_size   &&
+		stamp->ino   == (unsigned int)st.st_ino)
 		return 0;
 
-	sig->seconds = (git_time_t)st.st_mtime;
-	sig->size    = (git_off_t)st.st_size;
-	sig->ino     = (unsigned int)st.st_ino;
+	stamp->mtime = (git_time_t)st.st_mtime;
+	stamp->size  = (git_off_t)st.st_size;
+	stamp->ino   = (unsigned int)st.st_ino;
 
 	return 1;
 }
 
+void git_futils_file_stamp_set(
+	git_futils_file_stamp *target, const git_futils_file_stamp *source)
+{
+	assert(target);
+
+	if (source)
+		memcpy(target, source, sizeof(*target));
+	else
+		memset(target, 0, sizeof(*target));
+}
diff --git a/src/fileops.h b/src/fileops.h
index 6437ccc..ac0659d 100644
--- a/src/fileops.h
+++ b/src/fileops.h
@@ -267,26 +267,44 @@ extern int git_futils_find_system_file(git_buf *path, const char *filename);
  */
 extern int git_futils_fake_symlink(const char *new, const char *old);
 
-
+/**
+ * A file stamp represents a snapshot of information about a file that can
+ * be used to test if the file changes.  This portable implementation is
+ * based on stat data about that file, but it is possible that OS specific
+ * versions could be implemented in the future.
+ */
 typedef struct {
-	git_time_t seconds;
+	git_time_t mtime;
 	git_off_t  size;
 	unsigned int ino;
-} git_futils_stat_sig;
+} git_futils_file_stamp;
 
 /**
  * Compare stat information for file with reference info.
  *
- * Use this as a way to track if a file has changed on disk.  This will
- * return GIT_ENOTFOUND if the file doesn't exist, 0 if the file is up-to-date
- * with regards to the signature, and 1 if the file needs to reloaded.  When
- * a 1 is returned, the signature will also be updated with the latest data.
+ * This function updates the file stamp to current data for the given path
+ * and returns 0 if the file is up-to-date relative to the prior setting or
+ * 1 if the file has been changed.  (This also may return GIT_ENOTFOUND if
+ * the file doesn't exist.)
  *
- * @param sig stat signature structure
- * @param path path to be statted
+ * @param stamp File stamp to be checked
+ * @param path Path to stat and check if changed
  * @return 0 if up-to-date, 1 if out-of-date, <0 on error
  */
-extern int git_futils_stat_sig_needs_reload(
-	git_futils_stat_sig *sig, const char *path);
+extern int git_futils_file_stamp_has_changed(
+	git_futils_file_stamp *stamp, const char *path);
+
+/**
+ * Set or reset file stamp data
+ *
+ * This writes the target file stamp.  If the source is NULL, this will set
+ * the target stamp to values that will definitely be out of date.  If the
+ * source is not NULL, this copies the source values to the target.
+ *
+ * @param tgt File stamp to write to
+ * @param src File stamp to copy from or NULL to clear the target
+ */
+extern void git_futils_file_stamp_set(
+	git_futils_file_stamp *tgt, const git_futils_file_stamp *src);
 
 #endif /* INCLUDE_fileops_h__ */