From be916b0f009e3c643da5cd928907a28629cc9726 Mon Sep 17 00:00:00 2001
From: Derrick Brashear <shadow@dementia.org>
Date: Mon, 18 Jan 2010 19:25:02 -0500
Subject: [PATCH] macos set don't backup attribute on cache files

hint to time machine that cache files should not be backed up

Change-Id: I098c9231139b91ff093be74d8a39f94c185d478c
Reviewed-on: http://gerrit.openafs.org/1122
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
---
 src/afsd/afsd.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/afsd/afsd.c b/src/afsd/afsd.c
index adc6bec..60372ad 100644
--- a/src/afsd/afsd.c
+++ b/src/afsd/afsd.c
@@ -158,6 +158,7 @@ void set_staticaddrs(void);
 #ifdef AFS_DARWIN_ENV
 #ifdef AFS_DARWIN80_ENV
 #include <sys/ioctl.h>
+#include <sys/xattr.h>
 #endif
 #include <mach/mach.h>
 #ifndef AFS_DARWIN100_ENV
@@ -794,6 +795,24 @@ CreateCacheSubDir(char *basename, int dirNum)
     return (0);
 }
 
+static void
+SetNoBackupAttr(char *fullpn)
+{
+#ifdef AFS_DARWIN80_ENV
+    int ret;
+
+    ret = setxattr(fullpn, "com.apple.metadata:com_apple_backup_excludeItem",
+		   "com.apple.backupd", strlen("com.apple.backupd"), 0,
+		   XATTR_CREATE);
+    if(ret < 0)
+    {
+	if(errno != EEXIST)
+	    fprintf(stderr, "afsd: Warning: failed to set attribute to preclude cache backup: %s\n", strerror(errno));
+    }
+#endif
+    return;
+}
+
 static int
 MoveCacheFile(char *basename, int fromDir, int toDir, int cacheFile, 
 	      int maxDir)
@@ -827,6 +846,7 @@ MoveCacheFile(char *basename, int fromDir, int toDir, int cacheFile,
 	       from, to, ret, errno);
 	return -1;
     }
+    SetNoBackupAttr(to);
 
     /* Reset directory pointer; fix file counts */
     dir_for_V[cacheFile] = toDir;
@@ -1072,16 +1092,19 @@ doSweepAFSCache(int *vFilesFound,
 	     * Found the file holding the dcache entries.
 	     */
 	    missing_DCacheFile = 0;
+	    SetNoBackupAttr(fullpn_DCacheFile);
 	} else if (dirNum < 0 && strcmp(currp->d_name, VOLINFOFILE) == 0) {
 	    /*
 	     * Found the file holding the volume info.
 	     */
 	    missing_VolInfoFile = 0;
+	    SetNoBackupAttr(fullpn_VolInfoFile);
 	} else if (dirNum < 0 && strcmp(currp->d_name, CELLINFOFILE) == 0) {
 	    /*
 	     * Found the file holding the cell info.
 	     */
 	    missing_CellInfoFile = 0;
+	    SetNoBackupAttr(fullpn_CellInfoFile);
 	} else if ((strcmp(currp->d_name, ".") == 0)
 		   || (strcmp(currp->d_name, "..") == 0) ||
 #ifdef AFS_DECOSF_ENV
@@ -1161,6 +1184,7 @@ doSweepAFSCache(int *vFilesFound,
 			cache_dir_list[thisDir]++;
 			(*vFilesFound)++;
 		    }
+		    SetNoBackupAttr(fullpn_VFile);
 		}
 
 	    } else if (dir_for_V[vFileNum] >= maxDir
-- 
1.9.4