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0729d1e8fd
Historically, BSD cp has followed symbolic links in the destination
when copying recursively, while GNU cp has not. POSIX is somewhat
vague on the topic, but both interpretations are within bounds. In
33ad990ce9, cp was changed to apply the same logic for symbolic
links in the destination as for symbolic links in the source: follow
if not recursing (which is moot, as this situation can only arise
while recursing) or if the `-L` option was given. There is no support
for this in POSIX. We can either switch back, or go all the way.
Having carefully weighed the kind of trouble you can run into by
following unexpected symlinks up against the kind of trouble you can
run into by not following symlinks you expected to follow, we choose
to go all the way.
Note that this means we need to stat the destination twice: once,
following links, to check if it is or references the same file as the
source, and a second time, not following links, to set the dne flag
and determine the destination's type.
While here, remove a needless complication in the dne logic. We don't
need to explicitly reject overwriting a directory with a non-directory,
because it will fail anyway.
Finally, add test cases for copying a directory to a symlink and
overwriting a directory with a non-directory.
MFC after: never
Relnotes: yes
Sponsored by: Klara, Inc.
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D44578
423 lines
9.7 KiB
Bash
Executable file
423 lines
9.7 KiB
Bash
Executable file
#
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# SPDX-License-Identifier: BSD-2-Clause
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#
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# Copyright (c) 2020 Kyle Evans <kevans@FreeBSD.org>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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check_size()
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{
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file=$1
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sz=$2
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atf_check -o inline:"$sz\n" stat -f '%z' $file
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}
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atf_test_case basic
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basic_body()
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{
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echo "foo" > bar
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atf_check cp bar baz
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check_size baz 4
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}
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atf_test_case basic_symlink
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basic_symlink_body()
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{
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echo "foo" > bar
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ln -s bar baz
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atf_check cp baz foo
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atf_check test '!' -L foo
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atf_check cmp foo bar
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}
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atf_test_case chrdev
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chrdev_body()
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{
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echo "foo" > bar
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check_size bar 4
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atf_check cp /dev/null trunc
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check_size trunc 0
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atf_check cp bar trunc
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check_size trunc 4
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atf_check cp /dev/null trunc
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check_size trunc 0
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}
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atf_test_case hardlink
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hardlink_body()
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{
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echo "foo" >foo
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atf_check cp -l foo bar
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atf_check -o inline:"foo\n" cat bar
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atf_check_equal "$(stat -f%d,%i foo)" "$(stat -f%d,%i bar)"
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}
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atf_test_case hardlink_exists
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hardlink_exists_body()
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{
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echo "foo" >foo
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echo "bar" >bar
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atf_check -s not-exit:0 -e match:exists cp -l foo bar
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atf_check -o inline:"bar\n" cat bar
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atf_check_not_equal "$(stat -f%d,%i foo)" "$(stat -f%d,%i bar)"
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}
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atf_test_case hardlink_exists_force
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hardlink_exists_force_body()
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{
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echo "foo" >foo
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echo "bar" >bar
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atf_check cp -fl foo bar
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atf_check -o inline:"foo\n" cat bar
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atf_check_equal "$(stat -f%d,%i foo)" "$(stat -f%d,%i bar)"
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}
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atf_test_case matching_srctgt
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matching_srctgt_body()
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{
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# PR235438: `cp -R foo foo` would previously infinitely recurse and
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# eventually error out.
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mkdir foo
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echo "qux" > foo/bar
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cp foo/bar foo/zoo
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atf_check cp -R foo foo
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atf_check -o inline:"qux\n" cat foo/foo/bar
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atf_check -o inline:"qux\n" cat foo/foo/zoo
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atf_check -e not-empty -s not-exit:0 stat foo/foo/foo
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}
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atf_test_case matching_srctgt_contained
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matching_srctgt_contained_body()
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{
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# Let's do the same thing, except we'll try to recursively copy foo into
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# one of its subdirectories.
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mkdir foo
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ln -s foo coo
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echo "qux" > foo/bar
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mkdir foo/moo
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touch foo/moo/roo
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cp foo/bar foo/zoo
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atf_check cp -R foo foo/moo
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atf_check cp -RH coo foo/moo
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atf_check -o inline:"qux\n" cat foo/moo/foo/bar
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atf_check -o inline:"qux\n" cat foo/moo/coo/bar
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atf_check -o inline:"qux\n" cat foo/moo/foo/zoo
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atf_check -o inline:"qux\n" cat foo/moo/coo/zoo
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# We should have copied the contents of foo/moo before foo, coo started
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# getting copied in.
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atf_check -o not-empty stat foo/moo/foo/moo/roo
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atf_check -o not-empty stat foo/moo/coo/moo/roo
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atf_check -e not-empty -s not-exit:0 stat foo/moo/foo/moo/foo
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atf_check -e not-empty -s not-exit:0 stat foo/moo/coo/moo/coo
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}
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atf_test_case matching_srctgt_link
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matching_srctgt_link_body()
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{
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mkdir foo
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echo "qux" > foo/bar
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cp foo/bar foo/zoo
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atf_check ln -s foo roo
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atf_check cp -RH roo foo
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atf_check -o inline:"qux\n" cat foo/roo/bar
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atf_check -o inline:"qux\n" cat foo/roo/zoo
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}
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atf_test_case matching_srctgt_nonexistent
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matching_srctgt_nonexistent_body()
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{
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# We'll copy foo to a nonexistent subdirectory; ideally, we would
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# skip just the directory and end up with a layout like;
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#
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# foo/
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# bar
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# dne/
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# bar
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# zoo
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# zoo
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#
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mkdir foo
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echo "qux" > foo/bar
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cp foo/bar foo/zoo
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atf_check cp -R foo foo/dne
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atf_check -o inline:"qux\n" cat foo/dne/bar
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atf_check -o inline:"qux\n" cat foo/dne/zoo
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atf_check -e not-empty -s not-exit:0 stat foo/dne/foo
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}
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recursive_link_setup()
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{
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extra_cpflag=$1
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mkdir -p foo/bar
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ln -s bar foo/baz
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mkdir foo-mirror
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eval "cp -R $extra_cpflag foo foo-mirror"
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}
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atf_test_case recursive_link_dflt
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recursive_link_dflt_body()
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{
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recursive_link_setup
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# -P is the default, so this should work and preserve the link.
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atf_check cp -R foo foo-mirror
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atf_check test -L foo-mirror/foo/baz
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}
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atf_test_case recursive_link_Hflag
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recursive_link_Hflag_body()
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{
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recursive_link_setup
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# -H will not follow either, so this should also work and preserve the
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# link.
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atf_check cp -RH foo foo-mirror
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atf_check test -L foo-mirror/foo/baz
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}
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atf_test_case recursive_link_Lflag
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recursive_link_Lflag_body()
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{
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recursive_link_setup -L
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# -L will work, but foo/baz ends up expanded to a directory.
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atf_check test -d foo-mirror/foo/baz -a \
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'(' ! -L foo-mirror/foo/baz ')'
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atf_check cp -RL foo foo-mirror
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atf_check test -d foo-mirror/foo/baz -a \
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'(' ! -L foo-mirror/foo/baz ')'
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}
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atf_test_case samefile
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samefile_body()
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{
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echo "foo" >foo
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ln foo bar
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ln -s bar baz
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atf_check -e match:"baz and baz are identical" \
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-s exit:1 cp baz baz
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atf_check -e match:"bar and baz are identical" \
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-s exit:1 cp baz bar
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atf_check -e match:"foo and baz are identical" \
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-s exit:1 cp baz foo
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atf_check -e match:"bar and foo are identical" \
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-s exit:1 cp foo bar
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}
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file_is_sparse()
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{
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atf_check ${0%/*}/sparse "$1"
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}
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files_are_equal()
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{
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atf_check_not_equal "$(stat -f%d,%i "$1")" "$(stat -f%d,%i "$2")"
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atf_check cmp "$1" "$2"
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}
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atf_test_case sparse_leading_hole
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sparse_leading_hole_body()
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{
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# A 16-megabyte hole followed by one megabyte of data
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truncate -s 16M foo
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seq -f%015g 65536 >>foo
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file_is_sparse foo
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atf_check cp foo bar
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files_are_equal foo bar
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file_is_sparse bar
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}
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atf_test_case sparse_multiple_holes
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sparse_multiple_holes_body()
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{
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# Three one-megabyte blocks of data preceded, separated, and
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# followed by 16-megabyte holes
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truncate -s 16M foo
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seq -f%015g 65536 >>foo
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truncate -s 33M foo
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seq -f%015g 65536 >>foo
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truncate -s 50M foo
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seq -f%015g 65536 >>foo
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truncate -s 67M foo
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file_is_sparse foo
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atf_check cp foo bar
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files_are_equal foo bar
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file_is_sparse bar
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}
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atf_test_case sparse_only_hole
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sparse_only_hole_body()
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{
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# A 16-megabyte hole
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truncate -s 16M foo
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file_is_sparse foo
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atf_check cp foo bar
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files_are_equal foo bar
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file_is_sparse bar
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}
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atf_test_case sparse_to_dev
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sparse_to_dev_body()
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{
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# Three one-megabyte blocks of data preceded, separated, and
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# followed by 16-megabyte holes
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truncate -s 16M foo
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seq -f%015g 65536 >>foo
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truncate -s 33M foo
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seq -f%015g 65536 >>foo
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truncate -s 50M foo
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seq -f%015g 65536 >>foo
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truncate -s 67M foo
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file_is_sparse foo
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atf_check -o file:foo cp foo /dev/stdout
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}
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atf_test_case sparse_trailing_hole
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sparse_trailing_hole_body()
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{
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# One megabyte of data followed by a 16-megabyte hole
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seq -f%015g 65536 >foo
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truncate -s 17M foo
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file_is_sparse foo
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atf_check cp foo bar
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files_are_equal foo bar
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file_is_sparse bar
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}
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atf_test_case standalone_Pflag
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standalone_Pflag_body()
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{
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echo "foo" > bar
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ln -s bar foo
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atf_check cp -P foo baz
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atf_check -o inline:'Symbolic Link\n' stat -f %SHT baz
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}
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atf_test_case symlink
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symlink_body()
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{
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echo "foo" >foo
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atf_check cp -s foo bar
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atf_check -o inline:"foo\n" cat bar
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atf_check -o inline:"foo\n" readlink bar
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}
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atf_test_case symlink_exists
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symlink_exists_body()
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{
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echo "foo" >foo
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echo "bar" >bar
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atf_check -s not-exit:0 -e match:exists cp -s foo bar
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atf_check -o inline:"bar\n" cat bar
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}
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atf_test_case symlink_exists_force
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symlink_exists_force_body()
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{
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echo "foo" >foo
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echo "bar" >bar
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atf_check cp -fs foo bar
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atf_check -o inline:"foo\n" cat bar
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atf_check -o inline:"foo\n" readlink bar
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}
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atf_test_case directory_to_symlink
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directory_to_symlink_body()
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{
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mkdir -p foo
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ln -s .. foo/bar
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mkdir bar
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touch bar/baz
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atf_check -s not-exit:0 -e match:"Not a directory" \
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cp -R bar foo
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atf_check -s not-exit:0 -e match:"Not a directory" \
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cp -r bar foo
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}
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atf_test_case overwrite_directory
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overwrite_directory_body()
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{
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mkdir -p foo/bar/baz
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touch bar
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atf_check -s not-exit:0 -e match:"Is a directory" \
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cp bar foo
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rm bar
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mkdir bar
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touch bar/baz
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atf_check -s not-exit:0 -e match:"Is a directory" \
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cp -R bar foo
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atf_check -s not-exit:0 -e match:"Is a directory" \
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cp -r bar foo
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}
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atf_init_test_cases()
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{
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atf_add_test_case basic
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atf_add_test_case basic_symlink
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atf_add_test_case chrdev
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atf_add_test_case hardlink
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atf_add_test_case hardlink_exists
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atf_add_test_case hardlink_exists_force
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atf_add_test_case matching_srctgt
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atf_add_test_case matching_srctgt_contained
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atf_add_test_case matching_srctgt_link
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atf_add_test_case matching_srctgt_nonexistent
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atf_add_test_case recursive_link_dflt
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atf_add_test_case recursive_link_Hflag
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atf_add_test_case recursive_link_Lflag
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atf_add_test_case samefile
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atf_add_test_case sparse_leading_hole
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atf_add_test_case sparse_multiple_holes
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atf_add_test_case sparse_only_hole
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atf_add_test_case sparse_to_dev
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atf_add_test_case sparse_trailing_hole
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atf_add_test_case standalone_Pflag
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atf_add_test_case symlink
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atf_add_test_case symlink_exists
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atf_add_test_case symlink_exists_force
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atf_add_test_case directory_to_symlink
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atf_add_test_case overwrite_directory
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}
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