As custom errors are prefered over wrapping around common errors, the
distinction between UCommonError and UCustomError is removed. This
reduces the number of types and makes the error handling easier to
understand.
Use new macro to construct UIoError types from `std::io::Error` before
printing. This gives consistent error messages across all utilities as it
prepends custom errors to the error description for the respective application
and error type. This saves the developers from manually appending the
`std::io::Error`-specific error messages.
Drop the previous flags that would tell whether a noncritical error occured
during execution in favor of the `show!` macro from the error submodule.
This allows us to generate regular error types during execution to signify
failures inside the program, but without prematurely aborting program execution
if not needed or specified.
Also make verbose outputs use `print!` and friends instead of `show_error!` to
ensure verbose output is redirected to stdout, not stderr.
This makes clap wrap the help text according to the terminal width,
which improves readability for terminal widths < 120 chars,
because clap defaults to a width of 120 chars without this feature.
Adds the ability to perform file backups before installing newer files on top
of existing ones. Adds a status message about backups to stdout if running in
verbose mode.
The '--backup' option would previously accept arguments separated from the
option either by a space or an equals sign. The GNU implementation strictly
requires an "equals" for argument separation.
As the argument to '--backup' is optional, the equals sign mustn't be ommited
as otherwise there is no way to tell a file argument apart from an argument
that's meant for the '--backup' option. This ensures that if '--backup' is
present it either has no further associated arguments (i.e. fallback to the
default), or the arguments are separated by an equals sign.
The '-d' flag should create all ancestors (or components) of a
directory regardless of the presence of the "-D" flag.
From the man page:
-d, --directory
treat all arguments as directory names; create all components of the specified directories
With GNU:
$ install -v -d dir1/di2
install: creating directory 'dir1'
install: creating directory 'dir1/di2'
With this version:
$ ./target/release/install -v -d dir3/di4
install: dir3/di4: No such file or directory (os error 2)
install: dir3/di4: chmod failed with error No such file or directory (os error 2)
install: created directory 'dir3/di4'
Also, one of the unit tests misinterprets what a "component" is,
and hence was fixed.
Also don't run chmod when we just failed to create the directory.
Behaviour before this patch:
$ ./target/release/install -v -d dir1/dir2
install: dir1/dir2: Permission denied (os error 13)
install: dir1/dir2: chmod failed with error No such file or directory (os error 2)
install: created directory 'dir1/dir2'
* install: implement `-C` / `--compare`
GNU coreutils [1] checks the following: whether
- either file is nonexistent,
- there's a sticky bit or set[ug]id bit in play,
- either file isn't a regular file,
- the sizes of both files mismatch,
- the destination file's owner differs from intended, or
- the contents of both files mismatch.
[1] https://git.savannah.gnu.org/cgit/coreutils.git/tree/src/install.c?h=v8.32#n174
* Add test: non-regular files
* Forgot a #[test]
* Give up on non-regular file test
* `cargo fmt` install.rs
