chore: fix building master branch

The current build fails due to:

error: package `home v0.5.11` cannot be built because it requires rustc 1.81
or newer, while the currently active rustc version is 1.70.0

This commit increases the Rust version from 1.70.0 to 1.81.0.

Also fix most of the Clippy errors. One about an `Arc` is still there as a
fix is non-trivial, needs proper testing and hence deserves a separate PR.

fr32/src/convert.rs

@@ -12,6 +12,7 @@ pub enum Error {
 /// Invariants:
 /// - Value of each 32-byte chunks MUST represent valid Frs.
 /// - Total length must be a multiple of 32.
+///
 /// That is to say: each 32-byte chunk taken alone must be a valid Fr32.
 pub type Fr32Vec = Vec<u8>;
 

fr32/src/padding.rs

@@ -563,14 +563,14 @@ need to handle the potential bit-level misalignments:
 // offset and num_bytes are based on the unpadded data, so
 // if [0, 1, ..., 255] was the original unpadded data, offset 3 and len 4 would return
 // [3, 4, 5, 6].
-pub fn write_unpadded<W: ?Sized>(
+pub fn write_unpadded<W>(
     source: &[u8],
     target: &mut W,
     offset: usize,
     len: usize,
 ) -> io::Result<usize>
 where
-    W: Write,
+    W: Write + ?Sized,
 {
     // Check that there's actually `len` raw data bytes encoded inside
     // `source` starting at `offset`.
@@ -630,15 +630,15 @@ The reader will generally operate with bit precision, even if the padded
 layout is byte-aligned (no extra bits) the data inside it isn't (since
 we pad at the bit-level).
 **/
-fn write_unpadded_aux<W: ?Sized>(
+fn write_unpadded_aux<W>(
     padding_map: &PaddingMap,
     source: &[u8],
     target: &mut W,
     write_pos: usize,
     max_write_size: usize,
 ) -> io::Result<usize>
 where
-    W: Write,
+    W: Write + ?Sized,
 {
     // Position of the reader in the padded bit stream layout, deduced from
     // the position of the writer (`write_pos`) in the raw data layout.

rust-toolchain

@@ -1 +1 @@
-1.70.0
+1.81.0

storage-proofs-core/src/gadgets/insertion.rs

@@ -321,10 +321,7 @@ pub fn pick<Scalar: PrimeField, CS: ConstraintSystem<Scalar>>(
     condition: &Boolean,
     a: &AllocatedNum<Scalar>,
     b: &AllocatedNum<Scalar>,
-) -> Result<AllocatedNum<Scalar>, SynthesisError>
-where
-    CS: ConstraintSystem<Scalar>,
-{
+) -> Result<AllocatedNum<Scalar>, SynthesisError> {
     let c = AllocatedNum::alloc(cs.namespace(|| "pick result"), || {
         if condition
             .get_value()

storage-proofs-core/src/parameter_cache.rs

@@ -249,7 +249,7 @@ where
         let param_identifier = pub_params.identifier();
         info!("parameter set identifier for cache: {}", param_identifier);
         let mut hasher = Sha256::default();
-        hasher.update(&param_identifier.into_bytes());
+        hasher.update(param_identifier.into_bytes());
         let circuit_hash = hasher.finalize();
         format!(
             "{}-{:02x}",

storage-proofs-core/src/test_helper.rs

@@ -9,6 +9,7 @@ pub fn setup_replica(data: &[u8], replica_path: &Path) -> MmapMut {
         .read(true)
         .write(true)
         .create(true)
+        .truncate(true)
         .open(replica_path)
         .expect("Failed to create replica");
     f.write_all(data).expect("Failed to write data to replica");

storage-proofs-porep/build.rs

@@ -1,4 +1,5 @@
 fn main() {
+    println!("cargo::rustc-check-cfg=cfg(nightly)");
     cfg_if_nightly()
 }
 

storage-proofs-porep/src/stacked/vanilla/cache.rs

@@ -1,4 +1,5 @@
 use std::collections::{BTreeMap, HashSet};
+use std::fmt::Write;
 use std::fs::{remove_file, File};
 use std::io;
 use std::path::{Path, PathBuf};
@@ -250,7 +251,10 @@ impl ParentCache {
             drop(data);
 
             let hash = hasher.finalize();
-            digest_hex = hash.iter().map(|x| format!("{:01$x}", x, 2)).collect();
+            digest_hex = hash.iter().fold(String::new(), |mut output, x| {
+                let _write_never_fails = write!(output, "{:01$x}", x, 2);
+                output
+            });
 
             info!(
                 "[open] parent cache: calculated consistency digest: {:?}",
@@ -343,7 +347,10 @@ impl ParentCache {
             let mut hasher = Sha256::new();
             hasher.update(&data);
             let hash = hasher.finalize();
-            digest_hex = hash.iter().map(|x| format!("{:01$x}", x, 2)).collect();
+            digest_hex = hash.iter().fold(String::new(), |mut output, x| {
+                let _write_never_fails = write!(output, "{:01$x}", x, 2);
+                output
+            });
             info!(
                 "[generate] parent cache: generated consistency digest: {:?}",
                 digest_hex

storage-proofs-porep/src/stacked/vanilla/create_label/multi.rs

@@ -465,7 +465,7 @@ pub fn create_labels_for_encoding<
         // This could fail, but we will ignore the error if so.
         // It will be logged as a warning by `bind_core`.
         debug!("binding core in main thread");
-        group.get(0).map(|core_index| bind_core(*core_index))
+        group.first().map(|core_index| bind_core(*core_index))
     });
 
     // NOTE: this means we currently keep 2x sector size around, to improve speed
@@ -563,7 +563,7 @@ pub fn create_labels_for_decoding<Tree: 'static + MerkleTreeTrait, T: AsRef<[u8]
         // This could fail, but we will ignore the error if so.
         // It will be logged as a warning by `bind_core`.
         debug!("binding core in main thread");
-        group.get(0).map(|core_index| bind_core(*core_index))
+        group.first().map(|core_index| bind_core(*core_index))
     });
 
     // NOTE: this means we currently keep 2x sector size around, to improve speed

storage-proofs-porep/src/stacked/vanilla/proof.rs

@@ -192,12 +192,11 @@ impl<'a, Tree: 'static + MerkleTreeTrait, G: 'static + Hasher> StackedDrg<'a, Tr
                         t_aux.synth_proofs_path(),
                         partition_count,
                     )
-                    .map_err(|error| {
+                    .inspect_err(|_| {
                         info!(
                             "failed to read porep proofs from synthetic proofs file: {:?}",
                             t_aux.synth_proofs_path(),
                         );
-                        error
                     })
                 }
             }
@@ -1503,6 +1502,7 @@ impl<'a, Tree: 'static + MerkleTreeTrait, G: 'static + Hasher> StackedDrg<'a, Tr
                 );
                 let mut f = OpenOptions::new()
                     .create(true)
+                    .truncate(true)
                     .write(true)
                     .open(&tree_r_last_path)
                     .expect("failed to open file for tree_r_last");
@@ -1912,6 +1912,7 @@ impl<'a, Tree: 'static + MerkleTreeTrait, G: 'static + Hasher> StackedDrg<'a, Tr
                     );
                     let mut f = OpenOptions::new()
                         .create(true)
+                        .truncate(true)
                         .write(true)
                         .open(&tree_r_last_path)
                         .expect("failed to open file for tree_r_last");