1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
use std::path::PathBuf;
use clap::{crate_name, crate_version, App, AppSettings, Arg};
use humansize::file_size_opts::{self, FileSizeOpts};
use humansize::FileSize;
use num_format::{Locale, ToFormattedString};
use diskus::{Error, FilesizeType, Walk};
fn print_result(size: u64, errors: &[Error], size_format: &FileSizeOpts, verbose: bool) {
if verbose {
for err in errors {
match err {
Error::NoMetadataForPath(path) => {
eprintln!(
"diskus: could not retrieve metadata for path '{}'",
path.to_string_lossy()
);
}
Error::CouldNotReadDir(path) => {
eprintln!(
"diskus: could not read contents of directory '{}'",
path.to_string_lossy()
);
}
}
}
} else if !errors.is_empty() {
eprintln!(
"[diskus warning] the results may be tainted. Re-run with -v/--verbose to print all errors."
);
}
if atty::is(atty::Stream::Stdout) {
println!(
"{} ({:} bytes)",
size.file_size(size_format).unwrap(),
size.to_formatted_string(&Locale::en)
);
} else {
println!("{}", size);
}
}
fn main() {
let app = App::new(crate_name!())
.setting(AppSettings::ColorAuto)
.setting(AppSettings::ColoredHelp)
.setting(AppSettings::DeriveDisplayOrder)
.setting(AppSettings::UnifiedHelpMessage)
.version(crate_version!())
.about("Compute disk usage for the given filesystem entries")
.arg(
Arg::with_name("path")
.multiple(true)
.help("List of filesystem paths"),
)
.arg(
Arg::with_name("threads")
.long("threads")
.short("j")
.value_name("N")
.takes_value(true)
.help("Set the number of threads (default: 3 x num cores)"),
)
.arg(
Arg::with_name("size-format")
.long("size-format")
.takes_value(true)
.value_name("type")
.possible_values(&["decimal", "binary"])
.default_value("decimal")
.help("Output format for file sizes (decimal: MB, binary: MiB)"),
)
.arg(
Arg::with_name("verbose")
.long("verbose")
.short("v")
.takes_value(false)
.help("Do not hide filesystem errors"),
);
#[cfg(not(windows))]
let app = app.arg(
Arg::with_name("apparent-size")
.long("apparent-size")
.short("b")
.help("Compute apparent size instead of disk usage"),
);
let matches = app.get_matches();
// Setting the number of threads to 3x the number of cores is a good tradeoff between
// cold-cache and warm-cache runs. For a cold disk cache, we are limited by disk IO and
// therefore want the number of threads to be rather large in order for the IO scheduler to
// plan ahead. On the other hand, the number of threads shouldn't be too high for warm disk
// caches where we would otherwise pay a higher synchronization overhead.
let num_threads = matches
.value_of("threads")
.and_then(|t| t.parse().ok())
.unwrap_or(3 * num_cpus::get());
let paths: Vec<PathBuf> = matches
.values_of("path")
.map(|paths| paths.map(PathBuf::from).collect())
.unwrap_or_else(|| vec![PathBuf::from(".")]);
let filesize_type = if matches.is_present("apparent-size") {
FilesizeType::ApparentSize
} else {
FilesizeType::DiskUsage
};
let size_format = match matches.value_of("size-format") {
Some("decimal") => file_size_opts::DECIMAL,
_ => file_size_opts::BINARY,
};
let verbose = matches.is_present("verbose");
let walk = Walk::new(&paths, num_threads, filesize_type);
let (size, errors) = walk.run();
print_result(size, &errors, &size_format, verbose);
}
|
