Context: FAS8040 cDot 8.3, NFSv4.0 enabled, ACL disabled, AUTH_SYS used, CentOS 6 linux NFS4 clients.
cp -p produces an error message when the target in on an NFSv4 mount. Let say that an unpriviledged user (user2) want to copy a file from somebody else (user1), and put the copy in his HOME directory:
[user2@centos66 ~](0)$ ls -l ~user1/file.txt
-rwxr--r-- 1 user1 grp21 993 Jan 10 2006 /home/user1/file.txt
When user2 issues a "cp -p" command, the system preserves date and permission, and gives the owership of the new file to user2. No error is displayed, and this works when the target filesystem is local or on an NFSv3 share.
[user2@centos66 ~](0)$ cp -p ~user1/file.txt .
[user2@centos66 user2](0)$ ls -l file.txt
-rwxr--r-- 1 user2 grp21 993 Jan 10 2006 file.txt
But if the HOME of user is mounted with NFSv4 (= the target of the cp is on an NFSv4 share), I get a permission denied error: the file is copied, but return code is 1 and permissions are not preserved.
[user2@centos66 ~](0)$ cp -p ~user1/file.txt .
cp: failed to preserve ownership for `./file.txt': Permission denied
[user2@centos66 ~](1)$ ls -l file.txt
-rwx------ 1 user2 user2 993 Jan 10 2006 file.txt
This is annoying because "cp -p" is embedded in many scripts and the users have to deal with different error handlings.
Is there a way to make the behaviour the same as with an NFSv3 mount ?
I have put hereafter the strace outputs for convenience.
=== strace output for copy over NFSv3 ===
stat(".", {st_mode=S_IFDIR|0755, st_size=16384, ...}) = 0
stat("/home/user1/file.txt", {st_mode=S_IFREG|0744, st_size=993, ...}) = 0
stat("./file.txt", 0x7fffbd0f09a0) = -1 ENOENT (No such file or directory)
open("/home/user1/file.txt", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0744, st_size=993, ...}) = 0
open("./file.txt", O_WRONLY|O_CREAT|O_EXCL, 0700) = 4
fstat(4, {st_mode=S_IFREG|0700, st_size=0, ...}) = 0
read(3, "SERVER myserv 84a7d3ee\nVENDOR valiosys\nUSE_SERVER\nPACKAGE REQTIFY-PKG valiosys COMPONENTS=\"REQTIFY_ADVANCED \\\n\tREQTIFY_CONTROL"..., 65536) = 993
write(4, "SERVER myserv 84a7d3ee\nVENDOR valiosys\nUSE_SERVER\nPACKAGE REQTIFY-PKG valiosys COMPONENTS=\"REQTIFY_ADVANCED \\\n\tREQTIFY_CONTROL"..., 993) = 993
read(3, "", 65536) = 0
utimensat(4, NULL, {{1441268022, 750044000}, {1136913794, 0}}, 0) = 0
fchown(4, 160850, 2100) = -1 EPERM (Operation not permitted)
fchown(4, 4294967295, 2100) = 0
fgetxattr(3, "system.posix_acl_access", 0x7fffbd0f0560, 132) = -1 EOPNOTSUPP (Operation not supported)
=== strace output for copy over NFSv4 ===
stat(".", {st_mode=S_IFDIR|0755, st_size=16384, ...}) = 0
stat("/home/user1/file.txt", {st_mode=S_IFREG|0744, st_size=993, ...}) = 0
stat("./file.txt", 0x7fffcbd5e000) = -1 ENOENT (No such file or directory)
open("/home/user1/file.txt", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0744, st_size=993, ...}) = 0
open("./file.txt", O_WRONLY|O_CREAT|O_EXCL, 0700) = 4
fstat(4, {st_mode=S_IFREG|0700, st_size=0, ...}) = 0
read(3, "SERVER myserv 84a7d3ee\nVENDOR valiosys\nUSE_SERVER\nPACKAGE REQTIFY-PKG valiosys COMPONENTS=\"REQTIFY_ADVANCED \\\n\tREQTIFY_CONTROL"..., 65536) = 993
write(4, "SERVER myserv 84a7d3ee\nVENDOR valiosys\nUSE_SERVER\nPACKAGE REQTIFY-PKG valiosys COMPONENTS=\"REQTIFY_ADVANCED \\\n\tREQTIFY_CONTROL"..., 993) = 993
read(3, "", 65536) = 0
utimensat(4, NULL, {{1441268022, 750044000}, {1136913794, 0}}, 0) = 0
fchown(4, 160850, 2100) = -1 EACCES (Permission denied)
Thanks in advance for any help
JLD
