[yabridgectl] Use reflinks instead of copies

Whenever available. This should speed up the copying process while also
reducing the amount of disk space wasted on Btrfs and XFS filesystems.

CHANGELOG.md

@@ -30,6 +30,13 @@ Versioning](https://semver.org/spec/v2.0.0.html).
   serialized correctly. No plugins seem to actually use these, so it should not
   have caused any issues.
 
+### yabridgectl
+
+- Copies of `libyabridge-vst2.so` and `libyabridge-vst3.so` are now reflinked
+  when supported by the file system. This speeds up the file coyping process
+  while also reducing the amount of disk space used for yabridge when using
+  Btrfs or XFS.
+
 ## [3.3.1] - 2021-06-09
 
 ### Added

tools/yabridgectl/Cargo.lock

@@ -387,6 +387,16 @@ dependencies = [
  "redox_syscall",
 ]
 
+[[package]]
+name = "reflink"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc585ec28b565b4c28977ce8363a6636cedc280351ba25a7915f6c9f37f68cbe"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "rustyline"
 version = "6.3.0"
@@ -625,6 +635,7 @@ dependencies = [
  "lazy_static",
  "promptly",
  "rayon",
+ "reflink",
  "serde",
  "serde_derive",
  "textwrap 0.11.0",

tools/yabridgectl/Cargo.toml

@@ -17,6 +17,7 @@ colored = "2.0.0"
 is_executable = "0.1.2"
 lazy_static = "1.4.0"
 promptly = "0.3.0"
+reflink = "0.1.3"
 rayon = "1.3.1"
 serde = "1.0.114"
 serde_derive = "1.0.114"

tools/yabridgectl/src/actions.rs

@@ -501,7 +501,7 @@ fn install_file(
 
     match method {
         InstallationMethod::Copy => {
-            utils::copy(from, to)?;
+            utils::copy_or_reflink(from, to)?;
         }
         InstallationMethod::Symlink => {
             utils::symlink(from, to)?;

tools/yabridgectl/src/utils.rs

@@ -37,11 +37,12 @@ use crate::files::NativeFile;
 /// moment without causing issues.
 const YABRIDGE_HOST_EXPECTED_OUTPUT_PREFIX: &str = "Usage: yabridge-";
 
-/// Wrapper around [`std::fs::copy()`](std::fs::copy) with a human readable error message.
-pub fn copy<P: AsRef<Path>, Q: AsRef<Path>>(from: P, to: Q) -> Result<u64> {
-    fs::copy(&from, &to).with_context(|| {
+/// Wrapper around [`reflink::reflink_or_copy()`](reflink::reflink_or_copy) with a human readable
+/// error message.
+pub fn copy_or_reflink<P: AsRef<Path>, Q: AsRef<Path>>(from: P, to: Q) -> Result<Option<u64>> {
+    reflink::reflink_or_copy(&from, &to).with_context(|| {
         format!(
-            "Error copying '{}' to '{}'",
+            "Error reflinking '{}' to '{}'",
             from.as_ref().display(),
             to.as_ref().display()
         )