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authorRichard W.M. Jones <rjones@redhat.com>2011-03-28 14:45:23 +0100
committerRichard W.M. Jones <rjones@redhat.com>2011-03-28 14:49:48 +0100
commit0d6fd9e1d2488841c912c5351086e536772837ef (patch)
tree76a46cfaa49235270ef6848879d87e74e72800d4
parent4e529e06a4500959cd783f5029354fea47a253a6 (diff)
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fuse: Fix getxattr, listxattr calls and add a regression test (RHBZ#691389).
The documentation for the getxattr and listxattr calls is not very clear and as a result we were always returning something different from that which the Linux kernel would usually return. This fixes these calls, at least far enough that both the 'getfattr' and 'getfacl' programs now work fine on FUSE-mounted filesystems. Note that SELinux attrs are *not* passed through. This appears to be a known bug between SELinux and FUSE. For more information see: http://www.spinics.net/lists/selinux/msg09460.html
Notes
Notes: Labels: bugfix, RHBZ#691389
-rw-r--r--appliance/packagelist.in1
-rw-r--r--fuse/Makefile.am2
-rw-r--r--fuse/guestmount.c74
-rwxr-xr-xfuse/test-fuse.sh26
4 files changed, 83 insertions, 20 deletions
diff --git a/appliance/packagelist.in b/appliance/packagelist.in
index 5840d5d2..ebf94587 100644
--- a/appliance/packagelist.in
+++ b/appliance/packagelist.in
@@ -90,6 +90,7 @@
xz
#endif /* ARCHLINUX */
+acl
attr
bash
binutils
diff --git a/fuse/Makefile.am b/fuse/Makefile.am
index 7d3b463c..1cdb9938 100644
--- a/fuse/Makefile.am
+++ b/fuse/Makefile.am
@@ -1,5 +1,5 @@
# libguestfs
-# Copyright (C) 2009 Red Hat Inc.
+# Copyright (C) 2009-2011 Red Hat Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/fuse/guestmount.c b/fuse/guestmount.c
index 6adf1404..a0944909 100644
--- a/fuse/guestmount.c
+++ b/fuse/guestmount.c
@@ -1,5 +1,5 @@
/* guestmount - mount guests using libguestfs and FUSE
- * Copyright (C) 2009-2010 Red Hat Inc.
+ * Copyright (C) 2009-2011 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -745,19 +745,41 @@ fg_getxattr (const char *path, const char *name, char *value,
free_attrs = 1;
}
+ /* Find the matching attribute (index in 'i'). */
+ ssize_t r;
size_t i;
- int r = -ENOATTR;
for (i = 0; i < xattrs->len; ++i) {
- if (STREQ (xattrs->val[i].attrname, name)) {
- size_t sz = xattrs->val[i].attrval_len;
- if (sz > size)
- sz = size;
- memcpy (value, xattrs->val[i].attrval, sz);
- r = 0;
+ if (STREQ (xattrs->val[i].attrname, name))
break;
- }
}
+ if (i == xattrs->len) { /* not found */
+ r = -ENOATTR;
+ goto out;
+ }
+
+ /* The getxattr man page is unclear, but if value == NULL then we
+ * return the space required (the caller then makes a second syscall
+ * after allocating the required amount of space). If value != NULL
+ * then it's not clear what we should do, but it appears we should
+ * copy as much as possible and return -ERANGE if there's not enough
+ * space in the buffer.
+ */
+ size_t sz = xattrs->val[i].attrval_len;
+ if (value == NULL) {
+ r = sz;
+ goto out;
+ }
+
+ if (sz <= size)
+ r = sz;
+ else {
+ r = -ERANGE;
+ sz = size;
+ }
+ memcpy (value, xattrs->val[i].attrval, sz);
+
+out:
if (free_attrs)
guestfs_free_xattr_list ((struct guestfs_xattr_list *) xattrs);
@@ -781,25 +803,47 @@ fg_listxattr (const char *path, char *list, size_t size)
free_attrs = 1;
}
+ /* Calculate how much space is required to hold the result. */
+ size_t space = 0;
+ size_t len;
size_t i;
- ssize_t copied = 0;
for (i = 0; i < xattrs->len; ++i) {
- size_t len = strlen (xattrs->val[i].attrname) + 1;
+ len = strlen (xattrs->val[i].attrname) + 1;
+ space += len;
+ }
+
+ /* The listxattr man page is unclear, but if list == NULL then we
+ * return the space required (the caller then makes a second syscall
+ * after allocating the required amount of space). If list != NULL
+ * then it's not clear what we should do, but it appears we should
+ * copy as much as possible and return -ERANGE if there's not enough
+ * space in the buffer.
+ */
+ ssize_t r;
+ if (list == NULL) {
+ r = space;
+ goto out;
+ }
+
+ r = 0;
+ for (i = 0; i < xattrs->len; ++i) {
+ len = strlen (xattrs->val[i].attrname) + 1;
if (size >= len) {
memcpy (list, xattrs->val[i].attrname, len);
size -= len;
list += len;
- copied += len;
+ r += len;
} else {
- copied = -ERANGE;
+ r = -ERANGE;
break;
}
}
+ out:
if (free_attrs)
guestfs_free_xattr_list ((struct guestfs_xattr_list *) xattrs);
- return copied;
+ return r;
}
static int
@@ -881,7 +925,7 @@ usage (int status)
" --help Display help message and exit\n"
" --keys-from-stdin Read passphrases from stdin\n"
" --live Connect to a live virtual machine\n"
- " -m|--mount dev[:mnt] Mount dev on mnt (if omitted, /)\n"
+ " -m|--mount dev[:mnt[:opts]] Mount dev on mnt (if omitted, /)\n"
" -n|--no-sync Don't autosync\n"
" -o|--option opt Pass extra option to FUSE\n"
" -r|--ro Mount read-only\n"
diff --git a/fuse/test-fuse.sh b/fuse/test-fuse.sh
index 6d2f0fe0..0a429f73 100755
--- a/fuse/test-fuse.sh
+++ b/fuse/test-fuse.sh
@@ -1,6 +1,6 @@
#!/bin/bash -
# libguestfs
-# Copyright (C) 2009 Red Hat Inc.
+# Copyright (C) 2009-2011 Red Hat Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
@@ -92,15 +92,20 @@ $guestfish <<EOF
run
part-disk /dev/sda mbr
mkfs ext2 /dev/sda1
- mount /dev/sda1 /
+ mount_options acl,user_xattr /dev/sda1 /
write /hello.txt hello
write /world.txt "hello world"
touch /empty
+ touch /user_xattr
+ setxattr user.test hello123 8 /user_xattr
+ touch /acl
+ # XXX hack until libguestfs gets ACL support
+ debug sh "setfacl -m u:500:r /sysroot/acl" | cat > /dev/null
EOF
stage Mounting the filesystem
$guestmount \
- -a "$image" -m /dev/sda1 \
+ -a "$image" -m /dev/sda1:/:acl,user_xattr \
-o uid="$(id -u)" -o gid="$(id -g)" "$mp"
# To debug guestmount, add this to the end of the preceding command:
# -v -x & sleep 60
@@ -223,9 +228,22 @@ world
bigger
biggest" ]
+stage 'Checking extended attribute (xattr) read operation'
+if getfattr --help > /dev/null 2>&1 ; then
+ [ "$(getfattr -d user_xattr | grep -v ^#)" = 'user.test="hello123"' ]
+fi
+
+stage Checking POSIX ACL read operation
+if getfacl --help > /dev/null 2>&1 ; then
+ [ "$(getfacl -n acl | grep -v ^#)" = "user::rw-
+user:500:r--
+group::r--
+mask::r--
+other::r--" ]
+fi
+
# These ones are not yet tested by the current script:
#stage XXX statfs/statvfs
-#stage XXX xattr operations
# These ones cannot easily be tested by the current script, eg because
# this script doesn't run as root: