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| author | Pádraig Brady <P@draigBrady.com> | 2013-12-12 18:31:48 +0000 |
|---|---|---|
| committer | Pádraig Brady <P@draigBrady.com> | 2014-02-10 10:02:34 +0000 |
| commit | 9654b67a5443f046dd1e5fe655dc463463f6f9e3 (patch) | |
| tree | 1568967d54c11fdf6620f9ed60801bb774d953b2 /src/copy.c | |
| parent | 6e824a66194528696ba265d6111a6bddce4a8ff8 (diff) | |
| download | coreutils-9654b67a5443f046dd1e5fe655dc463463f6f9e3.tar.xz | |
cp: with --link always use linkat() if available
* src/copy.c (copy_reg): If linkat() is available it doesn't
matter about the gnulib emulation provided, and thus the
LINK_FOLLOWS_SYMLINKS should not have significance here.
This was noticed on FreeBSD and the consequence is that
cp --link will create hardlinks to symlinks there, rather
than emulating with symlinks to symlinks.
* tests/cp/link-deref.sh: Adjust the checks to cater
for all cases where hardlinks to symlinks are supported.
Diffstat (limited to 'src/copy.c')
| -rw-r--r-- | src/copy.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/src/copy.c b/src/copy.c index 3e4cbff7f..0b7c59ea9 100644 --- a/src/copy.c +++ b/src/copy.c @@ -98,6 +98,14 @@ rpl_mkfifo (char const *file, mode_t mode) #define SAME_GROUP(A, B) ((A).st_gid == (B).st_gid) #define SAME_OWNER_AND_GROUP(A, B) (SAME_OWNER (A, B) && SAME_GROUP (A, B)) +/* LINK_FOLLOWS_SYMLINKS is tri-state; if it is -1, we don't know + how link() behaves, so assume we can't hardlink symlinks in that case. */ +#if defined HAVE_LINKAT || ! LINK_FOLLOWS_SYMLINKS +# define CAN_HARDLINK_SYMLINKS 1 +#else +# define CAN_HARDLINK_SYMLINKS 0 +#endif + struct dir_list { struct dir_list *parent; @@ -2484,15 +2492,13 @@ copy_internal (char const *src_name, char const *dst_name, should not follow the link. We can approximate the desired behavior by skipping this hard-link creating block and instead copying the symlink, via the 'S_ISLNK'- copying code below. - LINK_FOLLOWS_SYMLINKS is tri-state; if it is -1, we don't know - how link() behaves, so we use the fallback case for safety. Note gnulib's linkat module, guarantees that the symlink is not dereferenced. However its emulation currently doesn't maintain timestamps or ownership so we only call it when we know the emulation will not be needed. */ else if (x->hard_link - && !(LINK_FOLLOWS_SYMLINKS && S_ISLNK (src_mode) + && !(! CAN_HARDLINK_SYMLINKS && S_ISLNK (src_mode) && x->dereference == DEREF_NEVER)) { if (! create_hard_link (src_name, dst_name, false, false, dereference)) @@ -2632,7 +2638,7 @@ copy_internal (char const *src_name, char const *dst_name, /* If we've just created a hard-link due to cp's --link option, we're done. */ if (x->hard_link && ! S_ISDIR (src_mode) - && !(LINK_FOLLOWS_SYMLINKS && S_ISLNK (src_mode) + && !(! CAN_HARDLINK_SYMLINKS && S_ISLNK (src_mode) && x->dereference == DEREF_NEVER)) return delayed_ok; |