libtar: backup and restore posix capabilities
This patch also allows libtar to combine data from multiple extended
tar headers into a single header.
Change-Id: I82d13e89a3622ea665b60062b1904ddbedfa41b3
diff --git a/libtar/append.c b/libtar/append.c
index 4388297..7c679f6 100644
--- a/libtar/append.c
+++ b/libtar/append.c
@@ -22,6 +22,10 @@
#include <sys/types.h>
#include <stdbool.h>
+#include <sys/capability.h>
+#include <sys/xattr.h>
+#include <linux/xattr.h>
+
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <string.h>
@@ -154,6 +158,24 @@
}
#endif
+ /* get posix file capabilities */
+ if (TH_ISREG(t) && t->options & TAR_STORE_POSIX_CAP)
+ {
+ if (t->th_buf.has_cap_data)
+ {
+ memset(&t->th_buf.cap_data, 0, sizeof(struct vfs_cap_data));
+ t->th_buf.has_cap_data = 0;
+ }
+
+ if (getxattr(realname, XATTR_NAME_CAPS, &t->th_buf.cap_data, sizeof(struct vfs_cap_data)) >= 0)
+ {
+ t->th_buf.has_cap_data = 1;
+#if 1 //def DEBUG
+ print_caps(&t->th_buf.cap_data);
+#endif
+ }
+ }
+
/* check if it's a hardlink */
#ifdef DEBUG
puts("tar_append_file(): checking inode cache for hardlink...");