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df: add support for --total option

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Add support for the `--total` option to `df`, which displays the total
of each numeric column. For example,

    $ df --total
    Filesystem            1K-blocks     Used Available Use% Mounted on
    udev                    3858016        0   3858016   0% /dev
    ...
    /dev/loop14               63488    63488         0 100% /snap/core20/1361
    total                 258775268 98099712 148220200  40% -
This commit is contained in:
Jeffrey Finkelstein 2022-02-27 11:20:27 -05:00 • committed by Sylvestre Ledru
parent 41acdb5471
commit d0ebd1c9d0
3 changed files with 117 additions and 0 deletions
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44
tests/by-util/test_df.rs
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@ -1,3 +1,4 @@
// spell-checker:ignore udev
use crate::common::util::*;
#[test]
@ -77,4 +78,47 @@ fn test_type_option() {
new_ucmd!().args(&["-t", "ext4", "-t", "ext3"]).succeeds();
}
#[test]
fn test_total() {
// Example output:
//
// Filesystem 1K-blocks Used Available Use% Mounted on
// udev 3858016 0 3858016 0% /dev
// ...
// /dev/loop14 63488 63488 0 100% /snap/core20/1361
// total 258775268 98099712 148220200 40% -
let output = new_ucmd!().arg("--total").succeeds().stdout_move_str();
// Skip the header line.
let lines: Vec<&str> = output.lines().skip(1).collect();
// Parse the values from the last row.
let last_line = lines.last().unwrap();
let mut iter = last_line.split_whitespace();
assert_eq!(iter.next().unwrap(), "total");
let reported_total_size = iter.next().unwrap().parse().unwrap();
let reported_total_used = iter.next().unwrap().parse().unwrap();
let reported_total_avail = iter.next().unwrap().parse().unwrap();
// Loop over each row except the last, computing the sum of each column.
let mut computed_total_size = 0;
let mut computed_total_used = 0;
let mut computed_total_avail = 0;
let n = lines.len();
for line in &lines[..n - 1] {
let mut iter = line.split_whitespace();
iter.next().unwrap();
computed_total_size += iter.next().unwrap().parse::<u64>().unwrap();
computed_total_used += iter.next().unwrap().parse::<u64>().unwrap();
computed_total_avail += iter.next().unwrap().parse::<u64>().unwrap();
}
// Check that the sum of each column matches the reported value in
// the last row.
assert_eq!(computed_total_size, reported_total_size);
assert_eq!(computed_total_used, reported_total_used);
assert_eq!(computed_total_avail, reported_total_avail);
// TODO We could also check here that the use percentage matches.
}
// ToDO: more tests...