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Avoid eagerly reading input streams in `-r` (#16857) 

## Summary

I think the comment should explain it.

Closes https://github.com/astral-sh/uv/issues/16856.
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Charlie Marsh 2025-11-25 22:55:08 -05:00 committed by GitHub
parent 4bb219f8b9
commit 4d747f6e86
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1 changed files with 7 additions and 6 deletions
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13
crates/uv-requirements/src/sources.rs
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@ -32,7 +32,7 @@ pub enum RequirementsSource {
impl RequirementsSource {
/// Parse a [`RequirementsSource`] from a [`PathBuf`]. The file type is determined by the file
/// extension.
/// extension and, in some cases, the file contents.
pub fn from_requirements_file(path: PathBuf) -> Result<Self> {
if path.ends_with("pyproject.toml") {
Ok(Self::PyprojectToml(path))
@ -65,12 +65,13 @@ impl RequirementsSource {
.is_some_and(|ext| ext.eq_ignore_ascii_case("txt") || ext.eq_ignore_ascii_case("in"))
{
Ok(Self::RequirementsTxt(path))
} else if path == Path::new("-") || path == Path::new("/dev/stdin") {
// If the path is `-`, treat it as a requirements.txt file from stdin.
Ok(Self::RequirementsTxt(path))
} else if path.extension().is_none() {
} else if path.extension().is_none() && path.is_file() {
// If we don't have an extension, attempt to detect a PEP 723 script, and
// fall back to `requirements.txt` format if not.
// fall back to `requirements.txt` format if not. (If the path isn't a file,
// we assume it's a readable file-like object in `requirements.txt` format, e.g.,
// `-r <( cat requirements.lock | grep -v nvidia | grep -v torch==)` or similar, in
// which case, reading the input would consume the stream, and only `requirements.txt`
// format is supported anyway.)
match Pep723Script::read_sync(&path) {
Ok(Some(script)) => Ok(Self::Pep723Script(Pep723ScriptSource::with_script(
path, script,