2f431bf8df
Change-Id: I13e95b91351af33c2452f1c4de45cc47aeae1dc0 Reviewed-on: https://cl.tvl.fyi/c/depot/+/4745 Tested-by: BuildkiteCI Reviewed-by: zseri <zseri.devel@ytrizja.de>
215 lines
11 KiB
Rust
215 lines
11 KiB
Rust
#![no_std]
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#![forbid(clippy::cast_ptr_alignment, trivial_casts, unconditional_recursion)]
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#![deny(clippy::as_conversions)]
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mod hbm;
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pub use hbm::HalfBytesMask;
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mod spec;
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pub use spec::*;
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/// limit maximal length of store basename
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const BASENAME_MAXLEN: usize = 255;
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/// this is a trait which implements the interface of possible inputs
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/// (usually byte slices)
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pub trait ScannerInput: AsRef<[u8]> + Sized {
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/// Splits the input into two at the given index.
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/// Afterwards self contains elements [at, len), and the returned input part contains elements [0, at).
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fn split_to(&mut self, at: usize) -> Self;
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fn finish(&mut self);
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}
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impl ScannerInput for &[u8] {
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fn split_to(&mut self, at: usize) -> Self {
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let (a, b) = self.split_at(at);
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*self = b;
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a
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}
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fn finish(&mut self) {
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*self = &[];
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}
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}
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impl ScannerInput for &mut [u8] {
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fn split_to(&mut self, at: usize) -> Self {
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// Lifetime dance taken from `impl Write for &mut [u8]`.
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// Taken from crate `std`.
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let (a, b) = core::mem::take(self).split_at_mut(at);
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*self = b;
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a
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}
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fn finish(&mut self) {
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*self = &mut [];
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}
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}
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/// this is the primary structure of this crate
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///
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/// it represents a scanner which scans binary slices for store references,
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/// and implements an iterator interfaces which returns these as byte slices.
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pub struct StoreRefScanner<'x, Input: 'x> {
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input: Input,
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spec: &'x StoreSpec<'x>,
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}
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impl<'x, Input> StoreRefScanner<'x, Input>
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where
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Input: ScannerInput + 'x,
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{
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pub fn new(input: Input, spec: &'x StoreSpec<'x>) -> Self {
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for i in [&spec.valid_hashbytes, &spec.valid_restbytes] {
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for j in [b'\0', b' ', b'\t', b'\n', b'/', b'\\'] {
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assert!(!i.contains(j));
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}
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}
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Self { input, spec }
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}
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}
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impl<'x, Input: 'x> Iterator for StoreRefScanner<'x, Input>
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where
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Input: ScannerInput + 'x,
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{
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type Item = Input;
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fn next(&mut self) -> Option<Input> {
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let hbl: usize = self.spec.hashbytes_len.into();
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'outer: while !self.input.as_ref().is_empty() {
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if !self.spec.path_to_store.is_empty() {
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let p2sas = self.spec.path_to_store;
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while !self.input.as_ref().starts_with(p2sas.as_bytes()) {
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if self.input.as_ref().is_empty() {
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break 'outer;
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}
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self.input.split_to(1);
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}
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self.input.split_to(p2sas.len());
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if self.input.as_ref().is_empty() {
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break 'outer;
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}
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}
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let hsep = matches!(self.input.as_ref().iter().next(), Some(b'/') | Some(b'\\'));
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self.input.split_to(1);
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if hsep && self.spec.check_rest(self.input.as_ref()) {
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// we have found a valid hash
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// rest contains the store basename and all following components
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// now let's search for the end
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// and then cut off possible following components after the basename
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let rlen = self
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.input
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.as_ref()
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.iter()
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.enumerate()
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.take(BASENAME_MAXLEN)
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.skip(hbl)
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.find(|&(_, &i)| !self.spec.valid_restbytes.contains(i))
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.map(|(eosp, _)| eosp)
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.unwrap_or_else(|| core::cmp::min(BASENAME_MAXLEN, self.input.as_ref().len()));
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return Some(self.input.split_to(rlen));
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}
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}
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self.input.finish();
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None
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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extern crate alloc;
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use alloc::{vec, vec::Vec};
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#[test]
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fn simple_nix2() {
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let drv: &[u8] = br#"
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Derive([("out","","r:sha256","")],[("/nix/store/2ax7bvjdfkzim69q957i0jlg0nvmapg0-util-linux-2.37.2.drv",["dev"]),("/nix/store/6b55ssmh8pzqsc4q4kw1yl3kqvr4fvqj-bash-5.1-p12.drv",["out"]),("/nix/store/fp2vx24kczlzv84avds28wyzsmrn8kyv-source.drv",["out"]),("/nix/store/s6c2lm5hpsvdwnxq9y1g3ngncghjzc3k-stdenv-linux.drv",["out"]),("/nix/store/xlnzpf4mzghi8vl0krabrgcbnqk5qjf3-pkg-config-wrapper-0.29.2.drv",["out"])],["/nix/store/03sl46khd8gmjpsad7223m32ma965vy9-fix-static.patch","/nix/store/2q3z7587yhlz0i2xvfvvap42zk5carlv-bcache-udev-modern.patch","/nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh"],"x86_64-linux","/0g15yibzzi3rmw29gqlbms05x9dbghbvh61v1qggydvmzh3bginw/bin/bash",["-e","/nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh"],[("buildInputs","/0sdk1r4l43yw4g6lmqdhd92vhdfhlwz3m76jxzvzsqsv63czw2km"),("builder","/0g15yibzzi3rmw29gqlbms05x9dbghbvh61v1qggydvmzh3bginw/bin/bash"),("configureFlags",""),("depsBuildBuild",""),("depsBuildBuildPropagated",""),("depsBuildTarget",""),("depsBuildTargetPropagated",""),("depsHostHost",""),("depsHostHostPropagated",""),("depsTargetTarget",""),("depsTargetTargetPropagated",""),("doCheck",""),("doInstallCheck",""),("makeFlags","PREFIX=/1rz4g4znpzjwh1xymhjpm42vipw92pr73vdgl6xs1hycac8kf2n9 UDEVLIBDIR=/1rz4g4znpzjwh1xymhjpm42vipw92pr73vdgl6xs1hycac8kf2n9/lib/udev/"),("name","bcache-tools-1.0.7"),("nativeBuildInputs","/1kw0rwgdyq9q69wmmsa5d2kap6p52b0yldbzi4w17bhcq5g5cp2f"),("out","/1rz4g4znpzjwh1xymhjpm42vipw92pr73vdgl6xs1hycac8kf2n9"),("outputHashAlgo","sha256"),("outputHashMode","recursive"),("outputs","out"),("patches","/nix/store/2q3z7587yhlz0i2xvfvvap42zk5carlv-bcache-udev-modern.patch /nix/store/03sl46khd8gmjpsad7223m32ma965vy9-fix-static.patch"),("pname","bcache-tools"),("preBuild","sed -e \"s|/bin/sh|/0g15yibzzi3rmw29gqlbms05x9dbghbvh61v1qggydvmzh3bginw/bin/sh|\" -i *.rules\n"),("preInstall","mkdir -p \"$out/sbin\" \"$out/lib/udev/rules.d\" \"$out/share/man/man8\"\n"),("prePatch","sed -e \"/INSTALL.*initramfs\\/hook/d\" \\\n -e \"/INSTALL.*initcpio\\/install/d\" \\\n -e \"/INSTALL.*dracut\\/module-setup.sh/d\" \\\n -e \"s/pkg-config/$PKG_CONFIG/\" \\\n -i Makefile\n"),("propagatedBuildInputs",""),("propagatedNativeBuildInputs",""),("src","/nix/store/6izcafvfcbz19chi7hl20834g0fa043n-source"),("stdenv","/01ncyv8bxibj0imgfvmxgqy648n697bachil6aw6i46g1jk0bbds"),("strictDeps",""),("system","x86_64-linux"),("version","1.0.7")])
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"#;
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// we convert everything into strings because it is way easier to compare elements in error messages
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let refs: Vec<&str> = StoreRefScanner::new(drv, &StoreSpec::DFL_NIX2)
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.map(|i| core::str::from_utf8(i).unwrap())
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.collect();
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let refs_expect: Vec<&[u8]> = vec![
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b"2ax7bvjdfkzim69q957i0jlg0nvmapg0-util-linux-2.37.2.drv",
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b"6b55ssmh8pzqsc4q4kw1yl3kqvr4fvqj-bash-5.1-p12.drv",
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b"fp2vx24kczlzv84avds28wyzsmrn8kyv-source.drv",
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b"s6c2lm5hpsvdwnxq9y1g3ngncghjzc3k-stdenv-linux.drv",
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b"xlnzpf4mzghi8vl0krabrgcbnqk5qjf3-pkg-config-wrapper-0.29.2.drv",
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b"03sl46khd8gmjpsad7223m32ma965vy9-fix-static.patch",
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b"2q3z7587yhlz0i2xvfvvap42zk5carlv-bcache-udev-modern.patch",
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b"9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh",
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b"9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh",
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b"2q3z7587yhlz0i2xvfvvap42zk5carlv-bcache-udev-modern.patch",
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b"03sl46khd8gmjpsad7223m32ma965vy9-fix-static.patch",
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b"6izcafvfcbz19chi7hl20834g0fa043n-source",
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];
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let refs_expect: Vec<&str> = refs_expect
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.into_iter()
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.map(|i| core::str::from_utf8(i).unwrap())
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.collect();
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assert_eq!(refs, refs_expect);
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}
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#[test]
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fn simple_yzix1() {
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// I haven't yet produced any yzix derivation which included /yzixs absolute paths...
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let fake: &[u8] = br#"
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/yzixs/4Zx1PBoft1YyAuKdhjAY1seZFHloxQ+8voHQRkRMuys: ASCII text
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/yzixs/dNE3yogD4JHKHzNa2t3jQMZddT8wjqlMDB0naDIFo0A: ASCII text
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/yzixs/FMluSVOHLc4bxX7F4lBCXafNljBnDn+rAM5HzG7k8LI: unified diff output, ASCII text
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/yzixs/g2G3GRL87hGEdw9cq2BZWqDQP_HeHSPRLbJ9P9KH+HI: unified diff output, ASCII text
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/yzixs/H08Av1ZAONwFdzVLpFQm0Sc0dvyk0sbnk82waoBig7I: ASCII text
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/yzixs/IndARQp+gaGDLS3K+PeyXdaRqAcCyS3EIbRXkkYjC94: unified diff output, ASCII text
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/yzixs/IrLPnbkEolTAuWRxkXpuvVs6Imb1iB6wUJcI+fxWwkU: POSIX shell script, ASCII text executable
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/yzixs/JsS_H3n3TSh2R6fiIzgOPZdjSmRkV71vGxstJJKPmr4: unified diff output, ASCII text
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/yzixs/LZ6pQh1x8DRxZ2IYzetBRS4LuE__IXFjpOfQPxHVwpw: unified diff output, ASCII text
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/yzixs/mEi2RPep9daRs0JUvwt1JsDfgYSph5sH_+_ihwn8IGQ: ASCII text
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/yzixs/nd4DyljinP3auDMHL_LrpsRJkWQpSHQK2jqtyyzWcBA: POSIX shell script, ASCII text executable
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/yzixs/nzpaknF0_ONSHtd0i_e1E3pkLF1QPeJQhAB7x9Ogo_M: unified diff output, ASCII text
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/yzixs/UZ3uzVUUMC1gKGLw6tg_aLFwoFrJedXB3xbhEgQOaiY: unified diff output, ASCII text
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/yzixs/VKyXxKTXsDGxYJ24YgbvCc1bZkA5twp3TC+Gbi4Kwd8: unified diff output, ASCII text
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/yzixs/VPJMl8O1xkc1LsJznpoQrCrQO0Iy+ODCPsgoUBLiRZc: unified diff output, ASCII text
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/yzixs/W6r1ow001ASHRj+gtRfyj9Fb_gCO_pBztX8WhYXVdIc: unified diff output, ASCII text
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/yzixs/xvwEcXIob_rQynUEtQiQbwaDXEobTVKEGaBMir9oH9k: unified diff output, ASCII text
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/yzixs/ZPvQbRJrtyeSITvW3FUZvw99hhNOO3CFqGgmWgScxcg: ASCII text
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"#;
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let refs: Vec<&str> = StoreRefScanner::new(fake, &StoreSpec::DFL_YZIX1)
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.map(|i| core::str::from_utf8(i).unwrap())
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.collect();
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let refs_expect: Vec<&[u8]> = vec![
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b"4Zx1PBoft1YyAuKdhjAY1seZFHloxQ+8voHQRkRMuys",
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b"dNE3yogD4JHKHzNa2t3jQMZddT8wjqlMDB0naDIFo0A",
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b"FMluSVOHLc4bxX7F4lBCXafNljBnDn+rAM5HzG7k8LI",
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b"g2G3GRL87hGEdw9cq2BZWqDQP_HeHSPRLbJ9P9KH+HI",
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b"H08Av1ZAONwFdzVLpFQm0Sc0dvyk0sbnk82waoBig7I",
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b"IndARQp+gaGDLS3K+PeyXdaRqAcCyS3EIbRXkkYjC94",
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b"IrLPnbkEolTAuWRxkXpuvVs6Imb1iB6wUJcI+fxWwkU",
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b"JsS_H3n3TSh2R6fiIzgOPZdjSmRkV71vGxstJJKPmr4",
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b"LZ6pQh1x8DRxZ2IYzetBRS4LuE__IXFjpOfQPxHVwpw",
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b"mEi2RPep9daRs0JUvwt1JsDfgYSph5sH_+_ihwn8IGQ",
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b"nd4DyljinP3auDMHL_LrpsRJkWQpSHQK2jqtyyzWcBA",
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b"nzpaknF0_ONSHtd0i_e1E3pkLF1QPeJQhAB7x9Ogo_M",
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b"UZ3uzVUUMC1gKGLw6tg_aLFwoFrJedXB3xbhEgQOaiY",
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b"VKyXxKTXsDGxYJ24YgbvCc1bZkA5twp3TC+Gbi4Kwd8",
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b"VPJMl8O1xkc1LsJznpoQrCrQO0Iy+ODCPsgoUBLiRZc",
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b"W6r1ow001ASHRj+gtRfyj9Fb_gCO_pBztX8WhYXVdIc",
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b"xvwEcXIob_rQynUEtQiQbwaDXEobTVKEGaBMir9oH9k",
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b"ZPvQbRJrtyeSITvW3FUZvw99hhNOO3CFqGgmWgScxcg",
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];
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let refs_expect: Vec<&str> = refs_expect
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.into_iter()
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.map(|i| core::str::from_utf8(i).unwrap())
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.collect();
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assert_eq!(refs, refs_expect);
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}
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#[test]
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fn just_store() {
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for i in [&StoreSpec::DFL_NIX2, &StoreSpec::DFL_YZIX1] {
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let refs: Vec<&[u8]> = StoreRefScanner::new(i.path_to_store.as_bytes(), i).collect();
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assert!(refs.is_empty());
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}
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}
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}
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