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Date: Thu, 02 Apr 2015 21:18:49 -0400
From: Jean-Marc Pigeon <jmp@...e.ca>
To: musl@...ts.openwall.com
Subject: bug? in musl libc failed to preserve ownership for
Hello.
Using cp (from native musl coreutils compilation, not busybox) I am
getting a strange result when doing a copy
(using musls-1.1.8)
test (user:group, no privilege 301:300, doing this as root is no problem):
;-------------------------------------------------------------
mkdir d1
cd d1
touch p1
ln -s p1 lp1
cd ..
cp -a d1 d2
cp: failed to preserve ownership for d2/lp1: Not supported
;--------------------------------------------------------------
Note: same cp from coreutils glibc working fine.
strace extract
getdents64(3, /* 4 entries */, 2048) = 96
getdents64(3, /* 0 entries */, 2048) = 0
close(3) = 0
lstat("d1/lp1", {st_mode=S_IFLNK|0777, st_size=2, ...}) = 0
readlink("d1/lp1", "p1", 3) = 2
symlink("p1", "d2/lp1") = 0
lstat("d2/lp1", {st_mode=S_IFLNK|0777, st_size=2, ...}) = 0
lchown("d2/lp1", 301, 300) = 0
newfstatat(AT_FDCWD, "d2/lp1", {st_mode=S_IFLNK|0777, st_size=2, ...},
AT_SYMLINK_NOFOLLOW) = 0
fcntl(1, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE)
writev(2, [{"cp: ", 4}, {NULL, 0}], 2cp: ) = 4
writev(2, [{"", 0}, {"failed to preserve ownership for"..., 39}],
2failed to preserve ownership for d2/lp1) = 39
writev(2, [{": Not supported", 15}, {NULL, 0}], 2: Not supported) = 15
writev(2, [{"", 0}, {"\n", 1}], 2
) = 1
lstat("d1/p1", {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
open("d1/p1", O_RDONLY|O_NOFOLLOW) = 3
;----------------------------------------------------------------------
My understanding/feeling, could be within fcntl not
reading symlink file status properly. possible?
however, even if 'cp' is complaining, the duplication
is properly done.
--
A bientôt
===========================================================
Jean-Marc Pigeon E-Mail: jmp@...e.ca
SAFE Inc. Phone: (514) 493-4280
Clement, 'a kiss solution' to get rid of SPAM (at last)
Clement' Home base <"http://www.clement.safe.ca">
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