Prevent a panic in `cp -a` when the target of a hard link already
exists in the target directory structure.
For example,
$ mkdir -p src dest/src
$ touch src/f dest/src/f
$ ln src/f src/link
$ cp -a src dest
The `cp` command now succeeds without error.
Summary:
* Disable test_retry6 on android because of intermittent failures
* Use wait() instead of wait_with_output in test_cat, test_cp, test_sort
* tests/sort: Simplify usage of test_sigpipe_panic
* Fix tests in test_tee.
tests/tac:
There was a change in the `tests/common/util.rs` test api concerning piped input which may have
revealed a bug in the implementation of tac. Please see also
https://github.com/uutils/coreutils/pull/4136
A short summary of changes:
* Add some basic tests for UChild and the run methods.
* Try more often in a fixed interval to create the tempfile for CapturedOutput.
* Fix drop order of struct fields for better cleanup of temporary files/dirs.
* Mark UChild::wait_with_output and UChild::pipe_in_and_wait_with_output deprecated
* Make CapturedOutput private
* Panic in stdout_all, stdout_all_bytes etc. if output is not captured.
* Rename some methods, refactor, clean up, fix documentation, add try_... methods
Before this commit, if `sparsefile` were a regular file of non-zero
size whose contents are all null bytes, then
dd if=sparsefile of=outfile conv=notrunc
would have resulted in `outfile` having zero size as reported by
`stat`. After this commit, `outfile` will have the same size as
`sparsefile` (even if the contents are represented sparsely by the
filesystem).
Move some tests that simulate a slow reader from `dd.rs` to
`tests/by-util/test_dd.rs`, and employ a FIFO and `sleep()` to
simulate the slow reader instead of a custom struct that implements
`Read`. This change restricts the type of `Input`s the
`Output::dd_out()` function can accept, facilitating a future change
to make `Input` an enum.
Allow uppercase "B" on its own as a unit specifier for the `count`,
`seek`, and `skip` arguments to `dd`.
For example,
$ printf "abcdef" | dd count=3B status=none
abc
Correct the behavior of `cp --reflink=never --sparse=always` so that
it performs a sparse copy. Before this commit, it was incorrectly
performing a dense copy.
Implement the `--copy-contents` option when the source is a FIFO, so
that the contents of the FIFO are copied (when the bytes become
available for reading) instead of the FIFO object itself. For example,
$ mkfifo fifo
$ cp --copy-contents fifo outfile &
[1] 1614080
$ echo foo > fifo
$ cat outfile
foo
[1]+ Done cp --copy-contents fifo outfile
Fix the behavior of `cp` when both `--backup` and `--force` are
specified and the source and destination are the same file. Before
this commit, `cp` terminated without copying and without making a
backup. After this commit, the copy is made and the backup file is
made. For example,
$ touch f
$ cp --force --backup f f
results in a backup file `f~` being created.
