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Check that .drv dependencies present in the store
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Original file line number | Diff line number | Diff line change |
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use nom::branch::alt; | ||
use nom::bytes::complete::{escaped_transform, is_not, tag}; | ||
use nom::character::complete::char; | ||
use nom::combinator::{eof, opt, value}; | ||
use nom::multi::separated_list0; | ||
use nom::sequence::{delimited, preceded, tuple}; | ||
use nom::{AsChar, IResult, InputIter, Slice}; | ||
use std::ffi::{OsStr, OsString}; | ||
use std::fmt::Debug; | ||
use std::fs::read; | ||
use std::ops::RangeFrom; | ||
use std::os::unix::prelude::OsStringExt; | ||
use std::path::Path; | ||
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#[derive(Debug)] | ||
#[allow(dead_code)] | ||
struct Derivation { | ||
outputs: Vec<(OsString, OsString, OsString, OsString)>, | ||
input_drvs: Vec<(OsString, Vec<OsString>)>, | ||
input_srcs: Vec<OsString>, | ||
platform: OsString, | ||
builder: OsString, | ||
args: Vec<OsString>, | ||
env: Vec<(OsString, OsString)>, | ||
} | ||
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/// Check if .drv file is present, and all of its inputs (both .drv and their | ||
/// outputs) are present. | ||
pub fn derivation_is_ok<P: AsRef<OsStr>>(path: P) -> Result<(), String> { | ||
// nix-shell doesn't create an output for the shell derivation, so we | ||
// check it's dependencies instead. | ||
for (drv, outputs) in load_derive(&path)?.input_drvs { | ||
let parsed_drv = load_derive(&drv)?; | ||
for out_name in outputs { | ||
let name = &parsed_drv | ||
.outputs | ||
.iter() | ||
.find(|(name, _, _, _)| name == &out_name) | ||
.ok_or_else(|| { | ||
format!( | ||
"{}: output {:?} not found", | ||
drv.to_string_lossy(), | ||
out_name | ||
) | ||
})? | ||
.1; | ||
if !Path::new(&name).exists() { | ||
return Err(format!("{}: not found", name.to_string_lossy())); | ||
} | ||
} | ||
} | ||
Ok(()) | ||
} | ||
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fn load_derive<P: AsRef<OsStr>>(path: P) -> Result<Derivation, String> { | ||
let data = read(path.as_ref()) | ||
.map_err(|e| format!("{}: !{}", path.as_ref().to_string_lossy(), e))?; | ||
parse_derive(&data).map(|a| a.1).map_err(|_| { | ||
format!("{}: failed to parse", path.as_ref().to_string_lossy()) | ||
}) | ||
} | ||
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fn parse_derive(input: &[u8]) -> IResult<&[u8], Derivation> { | ||
let (input, values) = delimited( | ||
tag("Derive"), | ||
tuple(( | ||
preceded(char('('), parse_list(parse_output)), | ||
preceded(char(','), parse_list(parse_input_drv)), | ||
preceded(char(','), parse_list(parse_string)), | ||
preceded(char(','), parse_string), | ||
preceded(char(','), parse_string), | ||
preceded(char(','), parse_list(parse_string)), | ||
preceded(char(','), parse_list(parse_env)), | ||
)), | ||
preceded(char(')'), eof), | ||
)(input)?; | ||
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let result = Derivation { | ||
outputs: values.0, | ||
input_drvs: values.1, | ||
input_srcs: values.2, | ||
platform: values.3, | ||
builder: values.4, | ||
args: values.5, | ||
env: values.6, | ||
}; | ||
Ok((input, result)) | ||
} | ||
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fn parse_output( | ||
input: &[u8], | ||
) -> IResult<&[u8], (OsString, OsString, OsString, OsString)> { | ||
tuple(( | ||
preceded(char('('), parse_string), | ||
preceded(char(','), parse_string), | ||
preceded(char(','), parse_string), | ||
delimited(char(','), parse_string, char(')')), | ||
))(input) | ||
} | ||
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fn parse_input_drv(input: &[u8]) -> IResult<&[u8], (OsString, Vec<OsString>)> { | ||
tuple(( | ||
preceded(char('('), parse_string), | ||
delimited(char(','), parse_list(parse_string), char(')')), | ||
))(input) | ||
} | ||
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fn parse_env(input: &[u8]) -> IResult<&[u8], (OsString, OsString)> { | ||
tuple(( | ||
preceded(char('('), parse_string), | ||
delimited(char(','), parse_string, char(')')), | ||
))(input) | ||
} | ||
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fn parse_list<I, O, E, F>(f: F) -> impl FnMut(I) -> IResult<I, Vec<O>, E> | ||
where | ||
I: Clone + nom::InputLength + Slice<RangeFrom<usize>> + InputIter, | ||
<I as InputIter>::Item: AsChar, | ||
F: nom::Parser<I, O, E>, | ||
E: nom::error::ParseError<I>, | ||
{ | ||
delimited(char('['), separated_list0(char(','), f), char(']')) | ||
} | ||
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fn parse_string(input: &[u8]) -> IResult<&[u8], OsString> { | ||
let (input, parsed) = delimited( | ||
char('\"'), | ||
opt(escaped_transform( | ||
is_not("\\\""), | ||
'\\', | ||
alt(( | ||
value(b"\\" as &'static [u8], char('\\')), | ||
value(b"\"" as &'static [u8], char('"')), | ||
value(b"\n" as &'static [u8], char('n')), | ||
)), | ||
)), | ||
char('\"'), | ||
)(input)?; | ||
Ok((input, OsString::from_vec(parsed.unwrap_or_default()))) | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,27 @@ | ||
#!/bin/sh | ||
. ./lib.sh | ||
# Check that the cache is invalidated when a dependency is deleted. | ||
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put tmp/shell.nix << 'EOF' | ||
with import <nixpkgs> { }; | ||
let | ||
dep = stdenv.mkDerivation { | ||
name = "cached-nix-shell-test-inner-dep"; | ||
unpackPhase = ": | md5sum | cut -c 1-32 > $out"; | ||
}; | ||
in mkShell { inherit dep; } | ||
EOF | ||
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run cached-nix-shell tmp/shell.nix --pure --run 'cat $dep; echo $dep > tmp/dep' | ||
check_contains d41d8cd98f00b204e9800998ecf8427e | ||
check_slow | ||
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run cached-nix-shell tmp/shell.nix --pure --run 'cat $dep' | ||
check_contains d41d8cd98f00b204e9800998ecf8427e | ||
check_fast | ||
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run nix-store --delete $(cat tmp/dep) | ||
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run cached-nix-shell tmp/shell.nix --pure --run 'cat $dep' | ||
check_contains d41d8cd98f00b204e9800998ecf8427e | ||
check_slow |