Add support for linking to SQLCipher

.travis.yml

@@ -1,4 +1,5 @@
 sudo: false
+dist: trusty
 
 language: rust
 
@@ -13,12 +14,10 @@ matrix:
 
 addons:
   apt:
-    sources:
-      - llvm-toolchain-precise-3.9
-      - ubuntu-toolchain-r-test
     packages: # recommanded versions for rust-bindgen
       - llvm-3.9-dev
       - libclang-3.9-dev
+      - libsqlcipher-dev
 
 env: # specify the clang path for rust-bindgen
   - LIBCLANG_PATH=/usr/lib/llvm-3.9/lib
@@ -26,6 +25,7 @@ env: # specify the clang path for rust-bindgen
 script:
   - cargo build
   - cargo build --features bundled
+  - cargo build --features sqlcipher
   - cargo test
   - cargo test --features backup
   - cargo test --features blob
@@ -36,6 +36,7 @@ script:
   - cargo test --features chrono
   - cargo test --features serde_json
   - cargo test --features bundled
+  - cargo test --features sqlcipher
   - cargo test --features "backup blob chrono functions limits load_extension serde_json trace"
   - cargo test --features "backup blob chrono functions limits load_extension serde_json trace buildtime_bindgen"
   - cargo test --features "backup blob chrono functions limits load_extension serde_json trace bundled"

Cargo.toml

@@ -26,6 +26,7 @@ trace = ["libsqlite3-sys/min_sqlite_version_3_6_23"]
 bundled = ["libsqlite3-sys/bundled"]
 buildtime_bindgen = ["libsqlite3-sys/buildtime_bindgen"]
 limits = []
+sqlcipher = ["libsqlite3-sys/sqlcipher"]
 
 [dependencies]
 time = "0.1.0"

libsqlite3-sys/Cargo.toml

@@ -7,13 +7,14 @@ description = "Native bindings to the libsqlite3 library"
 license = "MIT"
 links = "sqlite3"
 build = "build.rs"
-keywords = ["sqlite", "database", "ffi"]
+keywords = ["sqlite", "sqlcipher", "database", "ffi"]
 categories = ["database", "external-ffi-bindings"]
 
 [features]
 default = ["min_sqlite_version_3_6_8"]
 bundled = ["gcc"]
 buildtime_bindgen = ["bindgen", "pkg-config", "vcpkg"]
+sqlcipher = []
 min_sqlite_version_3_6_8 = ["pkg-config", "vcpkg"]
 min_sqlite_version_3_6_11 = ["pkg-config", "vcpkg"]
 min_sqlite_version_3_6_23 = ["pkg-config", "vcpkg"]

libsqlite3-sys/build.rs

@@ -9,6 +9,10 @@ mod build {
     use std::path::Path;
 
     pub fn main() {
+        if cfg!(feature = "sqlcipher") {
+            panic!("Builds with bundled SQLCipher are not supported");
+        }
+
         let out_dir = env::var("OUT_DIR").unwrap();
         let out_path = Path::new(&out_dir).join("bindgen.rs");
         fs::copy("sqlite3/bindgen_bundled_version.rs", out_path)
@@ -58,8 +62,9 @@ mod build {
         fn from(header: HeaderLocation) -> String {
             match header {
                 HeaderLocation::FromEnvironment => {
-                    let mut header = env::var("SQLITE3_INCLUDE_DIR")
-                        .expect("SQLITE3_INCLUDE_DIR must be set if SQLITE3_LIB_DIR is set");
+                    let prefix = env_prefix();
+                    let mut header = env::var(format!("{}_INCLUDE_DIR", prefix))
+                        .expect(&format!("{}_INCLUDE_DIR must be set if {}_LIB_DIR is set", prefix, prefix));
                     header.push_str("/sqlite3.h");
                     header
                 }
@@ -76,9 +81,11 @@ mod build {
 
     // Prints the necessary cargo link commands and returns the path to the header.
     fn find_sqlite() -> HeaderLocation {
+        let link_lib = link_lib();
+
         // Allow users to specify where to find SQLite.
-        if let Ok(dir) = env::var("SQLITE3_LIB_DIR") {
-            println!("cargo:rustc-link-lib=sqlite3");
+        if let Ok(dir) = env::var(format!("{}_LIB_DIR", env_prefix())) {
+            println!("cargo:rustc-link-lib={}", link_lib);
             println!("cargo:rustc-link-search={}", dir);
             return HeaderLocation::FromEnvironment;
         }
@@ -88,7 +95,7 @@ mod build {
         }
 
         // See if pkg-config can do everything for us.
-        match pkg_config::Config::new().print_system_libs(false).probe("sqlite3") {
+        match pkg_config::Config::new().print_system_libs(false).probe(link_lib) {
             Ok(mut lib) => {
                 if let Some(mut header) = lib.include_paths.pop() {
                     header.push("sqlite3.h");
@@ -102,7 +109,7 @@ mod build {
                 // request and hope that the library exists on the system paths. We used to
                 // output /usr/lib explicitly, but that can introduce other linking problems; see
                 // https://github.com/jgallagher/rusqlite/issues/207.
-                println!("cargo:rustc-link-lib=sqlite3");
+                println!("cargo:rustc-link-lib={}", link_lib);
                 HeaderLocation::Wrapper
             }
         }
@@ -111,7 +118,7 @@ mod build {
     #[cfg(all(feature = "vcpkg", target_env = "msvc"))]
     fn try_vcpkg() -> Option<HeaderLocation> {
         // See if vcpkg can find it.
-        if let Ok(mut lib) = vcpkg::Config::new().probe("sqlite3") {
+        if let Ok(mut lib) = vcpkg::Config::new().probe(link_lib()) {
             if let Some(mut header) = lib.include_paths.pop() {
                 header.push("sqlite3.h");
                 return Some(HeaderLocation::FromPath(header.to_string_lossy().into()));
@@ -125,6 +132,22 @@ mod build {
         None
     }
 
+    fn env_prefix() -> &'static str {
+        if cfg!(feature = "sqlcipher") {
+            "SQLCIPHER"
+        } else {
+            "SQLITE3"
+        }
+    }
+
+    fn link_lib() -> &'static str {
+        if cfg!(feature = "sqlcipher") {
+            "sqlcipher"
+        } else {
+            "sqlite3"
+        }
+    }
+
     #[cfg(not(feature = "buildtime_bindgen"))]
     mod bindings {
         use super::HeaderLocation;