Make liblzma an optional dependency.

It is only used when extracting binaries from the zonky repo
which is already behind a feature flag.

See also #187 for an xplanation of why this cause issues when
a project also pulls in the xz2 crate (can't link the lzma C
library twice).

Signed-off-by: Gerd Zellweger <mail@gerdzellweger.com>

Author: gz

postgresql_archive/Cargo.toml

@@ -15,7 +15,7 @@ async-trait = { workspace = true }
 flate2 = { workspace = true }
 futures-util = { workspace = true }
 hex = { workspace = true }
-liblzma = { workspace = true }
+liblzma = { workspace = true, optional = true }
 md-5 = { workspace = true, optional = true }
 num-format = { workspace = true }
 quick-xml = { workspace = true, features = ["serialize"], optional = true }
@@ -49,7 +49,7 @@ tokio = { workspace = true }
 [features]
 default = [
     "native-tls",
-    "theseus",
+    "theseus"
 ]
 blocking = ["dep:tokio"]
 github = [
@@ -77,6 +77,7 @@ theseus = [
 ]
 zonky = [
     "maven",
+    "liblzma"
 ]
 
 [package.metadata.docs.rs]

postgresql_archive/src/extractor/mod.rs

@@ -1,10 +1,12 @@
 mod model;
 pub mod registry;
 mod tar_gz_extractor;
+#[cfg(feature = "liblzma")]
 mod tar_xz_extractor;
 mod zip_extractor;
 
 pub use model::ExtractDirectories;
 pub use tar_gz_extractor::extract as tar_gz_extract;
+#[cfg(feature = "liblzma")]
 pub use tar_xz_extractor::extract as tar_xz_extract;
 pub use zip_extractor::extract as zip_extract;