RAID (0/1/4/5/6/10/linear, mdadm 0.90 e 1.x, degradado) e LVM2 remontados no disco virtual

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

crates/guara-core/tests/e2e_raid.rs

@@ -0,0 +1,123 @@
+//! Ponta a ponta: RAID 5 de 4 discos (um perdido) com ext4 dentro e um arquivo apagado.
+
+mod common;
+use common::*;
+use guara_core::assemble::{assemble_source, Assembly};
+use guara_core::scan::{self, Outcome};
+use guara_core::source::{FileSource, Source};
+use guara_core::*;
+use std::path::Path;
+use std::process::Command;
+use std::sync::Arc;
+
+fn have(t: &str) -> bool {
+    Command::new("sh").args(["-c", &format!("command -v {t}")]).output().map(|o| o.status.success()).unwrap_or(false)
+}
+
+fn data(seed: u64, n: usize) -> Vec<u8> {
+    let mut x = seed | 1;
+    (0..n)
+        .map(|_| {
+            x ^= x << 13;
+            x ^= x >> 7;
+            x ^= x << 17;
+            (x >> 24) as u8
+        })
+        .collect()
+}
+
+const CHUNK: usize = 64 * 1024;
+
+fn md_super(n: u32, dev: u32, data_off: u64, sectors: u64) -> Vec<u8> {
+    let mut b = vec![0u8; 4096];
+    b[0..4].copy_from_slice(&0xA92B_4EFCu32.to_le_bytes());
+    b[4..8].copy_from_slice(&1u32.to_le_bytes());
+    b[16..32].fill(0x5a);
+    b[72..76].copy_from_slice(&5u32.to_le_bytes());
+    b[76..80].copy_from_slice(&2u32.to_le_bytes());
+    b[80..88].copy_from_slice(&sectors.to_le_bytes());
+    b[88..92].copy_from_slice(&((CHUNK / 512) as u32).to_le_bytes());
+    b[92..96].copy_from_slice(&n.to_le_bytes());
+    b[128..136].copy_from_slice(&data_off.to_le_bytes());
+    b[136..144].copy_from_slice(&sectors.to_le_bytes());
+    b[160..164].copy_from_slice(&dev.to_le_bytes());
+    b[200..208].copy_from_slice(&50u64.to_le_bytes());
+    b[220..224].copy_from_slice(&n.to_le_bytes());
+    for i in 0..n as usize {
+        b[256 + i * 2..258 + i * 2].copy_from_slice(&(i as u16).to_le_bytes());
+    }
+    b
+}
+
+#[test]
+fn deleted_file_on_degraded_raid5() {
+    if !(have("mke2fs") && have("debugfs")) {
+        eprintln!("SKIP: e2fsprogs ausente");
+        return;
+    }
+    init();
+    let dir = tempfile::tempdir().unwrap();
+    let root = dir.path().join("root");
+    std::fs::create_dir_all(root.join("fotos")).unwrap();
+    let doc = data(5, 300_000);
+    std::fs::write(root.join("fotos/ferias.dat"), &doc).unwrap();
+    std::fs::write(root.join("fotos/outra.dat"), data(6, 9000)).unwrap();
+    let plain = dir.path().join("plain.img");
+    let n = 4usize;
+    let dd = n - 1;
+    let rows = 40usize;
+    let logical_len = rows * dd * CHUNK;
+    std::fs::File::create(&plain).unwrap().set_len(logical_len as u64).unwrap();
+    assert!(Command::new("mke2fs").args(["-q", "-F", "-t", "ext4", "-d"]).arg(&root).arg(&plain).status().unwrap().success());
+    Command::new("debugfs").arg("-w").arg("-R").arg("rm /fotos/ferias.dat").arg(&plain).output().unwrap();
+    let logical = std::fs::read(&plain).unwrap();
+
+    // RAID 5 left-symmetric
+    let data_off = 2048u64; // setores
+    let mut disks = vec![vec![0u8; data_off as usize * 512 + rows * CHUNK]; n];
+    for row in 0..rows {
+        let pd = n - 1 - row % n;
+        let mut p = vec![0u8; CHUNK];
+        for d in 0..dd {
+            let disk = (pd + 1 + d) % n;
+            let src = &logical[(row * dd + d) * CHUNK..(row * dd + d + 1) * CHUNK];
+            disks[disk][data_off as usize * 512 + row * CHUNK..][..CHUNK].copy_from_slice(src);
+            for i in 0..CHUNK {
+                p[i] ^= src[i];
+            }
+        }
+        disks[pd][data_off as usize * 512 + row * CHUNK..][..CHUNK].copy_from_slice(&p);
+    }
+    let mut paths = vec![];
+    for (i, d) in disks.iter_mut().enumerate() {
+        if i == 2 {
+            continue; // disco que morreu
+        }
+        let sb = md_super(n as u32, i as u32, data_off, (rows * CHUNK / 512) as u64);
+        d[4096..8192].copy_from_slice(&sb);
+        let p = dir.path().join(format!("disk{i}.img"));
+        std::fs::write(&p, &d).unwrap();
+        paths.push(p);
+    }
+    let base: Arc<dyn Source> = Arc::new(FileSource::open(&paths[0]).unwrap());
+    let asm = Assembly {
+        members: paths[1..].iter().map(|p| p.to_string_lossy().to_string()).collect(),
+        ..Default::default()
+    };
+    let a = assemble_source(base, &asm).unwrap();
+    assert!(a.notes.iter().any(|n| n.contains("degradado")), "{:?}", a.notes);
+    assert_eq!(a.extra_parts.len(), 1);
+    assert_eq!(a.extra_parts[0].fs, FsKind::Ext);
+    let opts = ScanOptions { mode: ScanMode::Deep, extra_parts: a.extra_parts.clone(), covered: a.covered.clone(), ..Default::default() };
+    let mut sink = Collect::default();
+    let out = scan::run(a.source.as_ref(), &opts, None, &[], &|| false, &mut sink);
+    assert!(matches!(out, Outcome::Completed));
+    let f = sink.found.iter().find(|f| f.name == "ferias.dat").unwrap_or_else(|| panic!("{:?}", sink.found.iter().map(|f| &f.name).collect::<Vec<_>>()));
+    assert_eq!(f.size, 300_000);
+    let dest = tempfile::tempdir().unwrap();
+    let rep = recover::recover(a.source.as_ref(), &[f], dest.path(), &|| false, &mut |_, _, _| {}).unwrap();
+    assert!(rep.failed.is_empty(), "{:?}", rep.failed);
+    let p = &rep.recovered[0].path;
+    let p = if Path::new(p).is_absolute() { Path::new(p).to_path_buf() } else { dest.path().join(p) };
+    assert!(std::fs::read(p).unwrap() == doc);
+}