[Bug-cpio] Bug#885163: --preserve-modification-time does not work on symlinks

[積丹尼 Dan Jacobson]

X-debbugs-cc: address@hidden
Package: cpio
Version: 2.12+dfsg-6

'-m'
'--preserve-modification-time'
     [*note copy-in::,*note copy-pass::]
     Retain previous file modification times when creating files.

does not work on symlinks!
$ ls n|cpio -o|(cd tt && cpio -tv)
1 block
lrwxrwxrwx   1 jidanni  jidanni         1 Dec 25 18:36 n -> m
1 block
$ ls n|cpio -o|(cd tt && cpio -idvm)
1 block
n
1 block
$ ls -l tt
total 0
lrwxrwxrwx 1 jidanni jidanni 1 12-25 18:38 n -> m

The user must make a second pass, using touch --no-dereference -d ...
to restore the dates to the original times.

Why is this important?
Well scripts that check if we have cpio'ed all the current versions of a
list of files will say that we failed.