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fix: 3 or more dots in file paths (#8544)

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# Description
In cases that a path contained 3 or more `.` in succession followed by a
path-separator, the dots would be expanded.
This logic didn't take into account the cases where characters other
than a separator could appear before the `...`, which would lead to
`...` in filenames being expanded.
This PR changes the behavior so that path-segments consisting of 3 or
more dots only will be expanded.
This PR fixes issue #8386


# User-Facing Changes
Paths with filenames like `.../folder.../file.txt` will be correctly
expanded.

# Tests + Formatting

I added tests that cover a number of cases.
This commit is contained in:
ahkrr 2023-06-18 15:21:57 +02:00 committed by GitHub
parent 1d5e7b441b
commit fa957a1a07
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 80 additions and 7 deletions
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87
crates/nu-path/src/dots.rs
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@ -55,18 +55,38 @@ pub fn expand_ndots(path: impl AsRef<Path>) -> PathBuf {
return path.as_ref().into();
}
enum Segment {
Empty,
OnlyDots,
OtherChars,
}
let mut dots_count = 0u8;
let mut expanded = String::new();
let mut path_segment = Segment::Empty;
let mut expanded = String::with_capacity(path_str.len() + 10);
for chr in path_str.chars() {
if chr == '.' {
if matches!(path_segment, Segment::Empty) {
path_segment = Segment::OnlyDots;
}
dots_count += 1;
} else {
if is_separator(chr) {
// check for dots expansion only at path component boundaries
handle_dots_push(&mut expanded, dots_count);
dots_count = 0;
if matches!(path_segment, Segment::OnlyDots) {
// check for dots expansion only at path component boundaries
handle_dots_push(&mut expanded, dots_count);
dots_count = 0;
} else {
// if at a path component boundary a secment consists of not only dots
// don't expand the dots and only append the the appropriate number of .
while dots_count > 0 {
expanded.push('.');
dots_count -= 1;
}
}
path_segment = Segment::Empty;
} else {
// got non-dot within path component => do not expand any dots
path_segment = Segment::OtherChars;
while dots_count > 0 {
expanded.push('.');
dots_count -= 1;
@ -76,7 +96,14 @@ pub fn expand_ndots(path: impl AsRef<Path>) -> PathBuf {
}
}
handle_dots_push(&mut expanded, dots_count);
// Here only the final dots without any following characters are handled
if matches!(path_segment, Segment::OnlyDots) {
handle_dots_push(&mut expanded, dots_count);
} else {
for _ in 0..dots_count {
expanded.push('.');
}
}
expanded.into()
}
@ -135,6 +162,9 @@ mod tests {
assert_eq!(PathBuf::from("/foo/bar/baz"), expand_dots(path));
}
// track_caller refers, in the panic-message, to the line of the function call and not
// inside of the function, which is nice for a test-helper-function
#[track_caller]
fn check_ndots_expansion(expected: &str, s: &str) {
let expanded = expand_ndots(Path::new(s));
assert_eq!(Path::new(expected), &expanded);
@ -161,6 +191,42 @@ mod tests {
check_ndots_expansion("a.b", "a.b");
}
#[test]
fn string_starts_with_dots() {
check_ndots_expansion(".file", ".file");
check_ndots_expansion("..file", "..file");
check_ndots_expansion("...file", "...file");
check_ndots_expansion("....file", "....file");
check_ndots_expansion(".....file", ".....file");
}
#[test]
fn string_ends_with_dots() {
check_ndots_expansion("file.", "file.");
check_ndots_expansion("file..", "file..");
check_ndots_expansion("file...", "file...");
check_ndots_expansion("file....", "file....");
check_ndots_expansion("file.....", "file.....");
}
#[test]
fn string_starts_and_ends_with_dots() {
check_ndots_expansion(".file.", ".file.");
check_ndots_expansion("..file..", "..file..");
check_ndots_expansion("...file...", "...file...");
check_ndots_expansion("....file....", "....file....");
check_ndots_expansion(".....file.....", ".....file.....");
}
#[test]
fn expand_multiple_dots() {
check_ndots_expansion("../..", "...");
check_ndots_expansion("../../..", "....");
check_ndots_expansion("../../../..", ".....");
check_ndots_expansion("../../../../", ".../...");
check_ndots_expansion("../../file name/../../", ".../file name/...");
check_ndots_expansion("../../../file name/../../../", "..../file name/....");
}
#[test]
fn expand_dots_double_dots_no_change() {
// Can't resolve this as we don't know our parent dir
@ -229,7 +295,7 @@ mod tests {
#[test]
fn string_with_three_ndots_and_garbage() {
check_ndots_expansion(r"ls ..\../ garbage.*[", "ls .../ garbage.*[");
check_ndots_expansion(r"file .../ garbage.*[", "file .../ garbage.*[");
}
}
@ -256,7 +322,14 @@ mod tests {
#[test]
fn string_with_three_ndots_and_garbage() {
check_ndots_expansion("ls ../../ garbage.*[", "ls .../ garbage.*[");
// filenames can contain spaces, in these cases the ... .... etc.
// that are part of a filepath should not be expanded
check_ndots_expansion("not_a_cmd .../ garbage.*[", "not_a_cmd .../ garbage.*[");
check_ndots_expansion("/not_a_cmd .../ garbage.*[", "/not_a_cmd .../ garbage.*[");
check_ndots_expansion("./not_a_cmd .../ garbage.*[", "./not_a_cmd .../ garbage.*[");
check_ndots_expansion("../../nac .../ garbage.*[", ".../nac .../ garbage.*[");
check_ndots_expansion("../../nac .../ garbage.*[...", ".../nac .../ garbage.*[...");
check_ndots_expansion("../../ garbage.*[", ".../ garbage.*[");
}
}
}