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coreutils/coreutils-cpxattrreadonly.patch

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From cca83fafa69eb26db458714830b77498b88af8a4 Mon Sep 17 00:00:00 2001
From: Ondřej Vašík <ovasik@redhat.com>
Date: Mon, 14 Sep 2009 13:12:01 +0000
Subject: cp,mv: preserve extended attributes even for read-only files
* src/copy.c (copy_reg): Temporarily set u+rw on the destination file
to allow GNU/Linux to set xattrs.
* tests/misc/xattr: Test that change.
Reported by Ernest N. Mamikonyan.
---
diff --git a/src/copy.c b/src/copy.c
index f3ff5a2..ad2060b 100644
--- a/src/copy.c
+++ b/src/copy.c
@@ -834,6 +834,24 @@ copy_reg (char const *src_name, char const *dst_name,
}
}
+ /* To allow copying xattrs on read-only files, temporarily chmod u+rw.
+ This workaround is required as an inode permission check is done
+ by xattr_permission() in fs/xattr.c of the GNU/Linux kernel tree. */
+ if (x->preserve_xattr)
+ {
+ bool access_changed = false;
+
+ if (!(sb.st_mode & S_IWUSR) && geteuid() != 0)
+ access_changed = fchmod_or_lchmod (dest_desc, dst_name, 0600) == 0;
+
+ if (!copy_attr_by_fd (src_name, source_desc, dst_name, dest_desc, x)
+ && x->require_preserve_xattr)
+ return_val = false;
+
+ if (access_changed)
+ fchmod_or_lchmod (dest_desc, dst_name, dst_mode & ~omitted_permissions);
+ }
+
if (x->preserve_ownership && ! SAME_OWNER_AND_GROUP (*src_sb, sb))
{
switch (set_owner (x, dst_name, dest_desc, src_sb, *new_dst, &sb))
@@ -850,11 +868,6 @@ copy_reg (char const *src_name, char const *dst_name,
set_author (dst_name, dest_desc, src_sb);
- if (x->preserve_xattr && ! copy_attr_by_fd (src_name, source_desc,
- dst_name, dest_desc, x)
- && x->require_preserve_xattr)
- return_val = false;
-
if (x->preserve_mode || x->move_mode)
{
if (copy_acl (src_name, source_desc, dst_name, dest_desc, src_mode) != 0
diff --git a/tests/misc/xattr b/tests/misc/xattr
index a27e1f6..fcf7ceb 100755
--- a/tests/misc/xattr
+++ b/tests/misc/xattr
@@ -29,7 +29,7 @@ fi
# Skip this test if cp was built without xattr support:
touch src dest || framework_failure
-cp --preserve=xattr -n src dest 2>/dev/null \
+cp --preserve=xattr -n src dest \
|| skip_test_ "coreutils built without xattr support"
# this code was taken from test mv/backup-is-src
@@ -46,13 +46,13 @@ xattr_pair="$xattr_name=\"$xattr_value\""
# create new file and check its xattrs
touch a || framework_failure
getfattr -d a >out_a || skip_test_ "failed to get xattr of file"
-grep -F "$xattr_pair" out_a >/dev/null && framework_failure
+grep -F "$xattr_pair" out_a && framework_failure
# try to set user xattr on file
setfattr -n "$xattr_name" -v "$xattr_value" a >out_a \
|| skip_test_ "failed to set xattr of file"
getfattr -d a >out_a || skip_test_ "failed to get xattr of file"
-grep -F "$xattr_pair" out_a >/dev/null \
+grep -F "$xattr_pair" out_a \
|| skip_test_ "failed to set xattr of file"
fail=0
@@ -60,36 +60,50 @@ fail=0
# cp should not preserve xattr by default
cp a b || fail=1
getfattr -d b >out_b || skip_test_ "failed to get xattr of file"
-grep -F "$xattr_pair" out_b >/dev/null && fail=1
+grep -F "$xattr_pair" out_b && fail=1
# test if --preserve=xattr option works
cp --preserve=xattr a b || fail=1
getfattr -d b >out_b || skip_test_ "failed to get xattr of file"
-grep -F "$xattr_pair" out_b >/dev/null || fail=1
+grep -F "$xattr_pair" out_b || fail=1
#test if --preserve=all option works
cp --preserve=all a c || fail=1
getfattr -d c >out_c || skip_test_ "failed to get xattr of file"
-grep -F "$xattr_pair" out_c >/dev/null || fail=1
+grep -F "$xattr_pair" out_c || fail=1
#test if -a option works without any diagnostics
cp -a a d 2>err && test -s err && fail=1
getfattr -d d >out_d || skip_test_ "failed to get xattr of file"
-grep -F "$xattr_pair" out_d >/dev/null || fail=1
+grep -F "$xattr_pair" out_d || fail=1
+
+#test if --preserve=xattr works even for files without write access
+chmod a-w a || framework_failure
+rm -f e
+cp --preserve=xattr a e || fail=1
+getfattr -d e >out_e || skip_test_ "failed to get xattr of file"
+grep -F "$xattr_pair" out_e || fail=1
+
+#Ensure that permission bits are preserved, too.
+src_perm=$(stat --format=%a a)
+dst_perm=$(stat --format=%a e)
+test "$dst_perm" = "$src_perm" || fail=1
+
+chmod u+w a || framework_failure
rm b || framework_failure
# install should never preserve xattr
ginstall a b || fail=1
getfattr -d b >out_b || skip_test_ "failed to get xattr of file"
-grep -F "$xattr_pair" out_b >/dev/null && fail=1
+grep -F "$xattr_pair" out_b && fail=1
# mv should preserve xattr when renaming within a file system.
# This is implicitly done by rename () and doesn't need explicit
# xattr support in mv.
mv a b || fail=1
getfattr -d b >out_b || skip_test_ "failed to get xattr of file"
-grep -F "$xattr_pair" out_b >/dev/null || cat >&2 <<EOF
+grep -F "$xattr_pair" out_b || cat >&2 <<EOF
=================================================================
$0: WARNING!!!
rename () does not preserve extended attributes
@@ -99,18 +113,18 @@ EOF
# try to set user xattr on file on other partition
test_mv=1
touch "$b_other" || framework_failure
-setfattr -n "$xattr_name" -v "$xattr_value" "$b_other" >out_a 2>/dev/null \
+setfattr -n "$xattr_name" -v "$xattr_value" "$b_other" >out_a \
|| test_mv=0
-getfattr -d "$b_other" >out_b 2>/dev/null || test_mv=0
-grep -F "$xattr_pair" out_b >/dev/null || test_mv=0
+getfattr -d "$b_other" >out_b || test_mv=0
+grep -F "$xattr_pair" out_b || test_mv=0
rm -f "$b_other" || framework_failure
if test $test_mv -eq 1; then
# mv should preserve xattr when copying content from one partition to another
mv b "$b_other" || fail=1
- getfattr -d "$b_other" >out_b 2>/dev/null ||
+ getfattr -d "$b_other" >out_b ||
skip_test_ "failed to get xattr of file"
- grep -F "$xattr_pair" out_b >/dev/null || fail=1
+ grep -F "$xattr_pair" out_b || fail=1
else
cat >&2 <<EOF
=================================================================
--
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