lgetxattr(2) man page says:
> If size is specified as zero, these calls return the current size of
> the named extended attribute (and leave value unchanged). This can be
> used to determine the size of the buffer that should be supplied in a
> subsequent call. (But, bear in mind that there is a possibility that
> the attribute value may change between the two calls, so that it is
> still necessary to check the return status from the second call.)
The current code does not handle the case when the size changes between
the two calls, and the new size is larger.
Fix the above problem, and slightly simplify the code.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
If `unix.Lgetxattr` returns an error, then `sz == -1` which will cause a
runtime panic if `errno == unix.ERANGE`.
Signed-off-by: Sascha Grunert <sgrunert@suse.com>
Use the symlink xattr syscall wrappers Lgetxattr and Lsetxattr from
x/sys/unix (introduced in golang/sys@b90f89a) instead of providing own
wrappers. Leave the functionality of system.Lgetxattr intact with
respect to the retry with a larger buffer, but switch it to use
unix.Lgetxattr. Also leave system.Lsetxattr intact (even though it's
just a wrapper around the corresponding function from unix) in order to
keep moby building for !linux.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Changes most references of syscall to golang.org/x/sys/
Ones aren't changes include, Errno, Signal and SysProcAttr
as they haven't been implemented in /x/sys/.
Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>
[s390x] switch utsname from unsigned to signed
per 33267e036f
char in s390x in the /x/sys/unix package is now signed, so
change the buildtags
Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>
This is a package for generic system calls etc that for some reason
is not yet supported by "syscall", or where it is different enough
for the different ports to need portability wrappers.
Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
