From cf45399bae9dac22ad58885b3c97b2c4ba523f40 Mon Sep 17 00:00:00 2001
From: trasz <trasz@FreeBSD.org>
Date: Sat, 30 Jan 2010 15:50:01 +0000
Subject: [PATCH] MFC r201016:

Improve ACL branding mismatch detection and reporting in some rare cases,
such as "setfacl -m ''".
---
 bin/setfacl/merge.c   | 10 +++++-----
 bin/setfacl/remove.c  |  5 ++---
 bin/setfacl/setfacl.h |  2 ++
 bin/setfacl/util.c    | 23 +++++++++++++++++++++++
 4 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/bin/setfacl/merge.c b/bin/setfacl/merge.c
index 495e66c45a24..0a42eecb74c3 100644
--- a/bin/setfacl/merge.c
+++ b/bin/setfacl/merge.c
@@ -100,11 +100,10 @@ merge_acl(acl_t acl, acl_t *prev_acl, const char *filename)
 	acl_get_brand_np(acl, &acl_brand);
 	acl_get_brand_np(*prev_acl, &prev_acl_brand);
 
-	if (acl_brand != prev_acl_brand) {
+	if (branding_mismatch(acl_brand, prev_acl_brand)) {
 		warnx("%s: branding mismatch; existing ACL is %s, "
 		    "entry to be merged is %s", filename,
-		    prev_acl_brand == ACL_BRAND_NFS4 ? "NFSv4" : "POSIX.1e",
-		    acl_brand == ACL_BRAND_NFS4 ? "NFSv4" : "POSIX.1e");
+		    brand_name(prev_acl_brand), brand_name(acl_brand));
 		return (-1);
 	}
 
@@ -252,9 +251,10 @@ add_acl(acl_t acl, uint entry_number, acl_t *prev_acl, const char *filename)
 		return (-1);
 	}
 
-	if (acl_brand != ACL_BRAND_NFS4) {
+	if (branding_mismatch(acl_brand, ACL_BRAND_NFS4)) {
 		warnx("%s: branding mismatch; existing ACL is NFSv4, "
-		    "entry to be added is POSIX.1e", filename);
+		    "entry to be added is %s", filename,
+		    brand_name(acl_brand));
 		return (-1);
 	}
 
diff --git a/bin/setfacl/remove.c b/bin/setfacl/remove.c
index 6cd82b36d9e0..e6feef9beada 100644
--- a/bin/setfacl/remove.c
+++ b/bin/setfacl/remove.c
@@ -53,11 +53,10 @@ remove_acl(acl_t acl, acl_t *prev_acl, const char *filename)
 	acl_get_brand_np(acl, &acl_brand);
 	acl_get_brand_np(*prev_acl, &prev_acl_brand);
 
-	if (acl_brand != prev_acl_brand) {
+	if (branding_mismatch(acl_brand, prev_acl_brand)) {
 		warnx("%s: branding mismatch; existing ACL is %s, "
 		    "entry to be removed is %s", filename,
-		    prev_acl_brand == ACL_BRAND_NFS4 ? "NFSv4" : "POSIX.1e",
-		    acl_brand == ACL_BRAND_NFS4 ? "NFSv4" : "POSIX.1e");
+		    brand_name(prev_acl_brand), brand_name(acl_brand));
 		return (-1);
 	}
 
diff --git a/bin/setfacl/setfacl.h b/bin/setfacl/setfacl.h
index 7c11b3a14f7c..290ac5b4d1d1 100644
--- a/bin/setfacl/setfacl.h
+++ b/bin/setfacl/setfacl.h
@@ -71,6 +71,8 @@ void   remove_ext(acl_t *prev_acl, const char *filename);
 int    set_acl_mask(acl_t *prev_acl, const char *filename);
 /* util.c */
 void  *zmalloc(size_t size);
+const char *brand_name(int brand);
+int    branding_mismatch(int brand1, int brand2);
 
 uint       have_mask;
 uint       need_mask;
diff --git a/bin/setfacl/util.c b/bin/setfacl/util.c
index 46b9abb6ff6b..3c429797b14d 100644
--- a/bin/setfacl/util.c
+++ b/bin/setfacl/util.c
@@ -43,3 +43,26 @@ zmalloc(size_t size)
 		err(1, "calloc() failed");
 	return (ptr);
 }
+
+const char *
+brand_name(int brand)
+{
+	switch (brand) {
+	case ACL_BRAND_NFS4:
+		return "NFSv4";
+	case ACL_BRAND_POSIX:
+		return "POSIX.1e";
+	default:
+		return "unknown";
+	}
+}
+
+int
+branding_mismatch(int brand1, int brand2)
+{
+	if (brand1 == ACL_BRAND_UNKNOWN || brand2 == ACL_BRAND_UNKNOWN)
+		return (0);
+	if (brand1 != brand2)
+		return (1);
+	return (1);
+}