Make url optional via a new "cred" feature gate for credential helpers

Cargo.toml

@@ -16,7 +16,7 @@ categories = ["api-bindings"]
 edition = "2018"
 
 [dependencies]
-url = "2.5.4"
+url = { version = "2.5.4", optional = true }
 bitflags = "2.1.0"
 libc = "0.2"
 log = "0.4.8"
@@ -30,12 +30,15 @@ openssl-probe = { version = "0.1", optional = true }
 clap = { version = "4.4.13", features = ["derive"] }
 time = { version = "0.3.37", features = ["formatting"] }
 tempfile = "3.1.0"
+url = "2.5.4"
 
 [features]
 unstable = []
-default = ["ssh", "https"]
-ssh = ["libgit2-sys/ssh"]
-https = ["libgit2-sys/https", "openssl-sys", "openssl-probe"]
+default = ["ssh", "https", "cred"]
+ssh = ["libgit2-sys/ssh", "cred"]
+https = ["libgit2-sys/https", "openssl-sys", "openssl-probe", "cred"]
+# Include support for credentials, which pulls in the `url` crate and all its dependencies
+cred = ["dep:url"]
 vendored-libgit2 = ["libgit2-sys/vendored"]
 vendored-openssl = ["openssl-sys/vendored", "libgit2-sys/vendored-openssl"]
 zlib-ng-compat = ["libgit2-sys/zlib-ng-compat"]

src/cred.rs

@@ -1,20 +1,22 @@
+#[cfg(feature = "cred")]
 use log::{debug, trace};
 use std::ffi::CString;
-use std::io::Write;
 use std::mem;
 use std::path::Path;
-use std::process::{Command, Stdio};
 use std::ptr;
 
 use crate::util::Binding;
-use crate::{raw, Config, Error, IntoCString};
+#[cfg(feature = "cred")]
+use crate::Config;
+use crate::{raw, Error, IntoCString};
 
 /// A structure to represent git credentials in libgit2.
 pub struct Cred {
     raw: *mut raw::git_cred,
 }
 
 /// Management of the gitcredentials(7) interface.
+#[cfg(feature = "cred")]
 pub struct CredentialHelper {
     /// A public field representing the currently discovered username from
     /// configuration.
@@ -118,6 +120,7 @@ impl Cred {
     /// successful.
     ///
     /// [1]: https://www.kernel.org/pub/software/scm/git/docs/gitcredentials.html
+    #[cfg(feature = "cred")]
     pub fn credential_helper(
         config: &Config,
         url: &str,
@@ -189,6 +192,7 @@ impl Drop for Cred {
     }
 }
 
+#[cfg(feature = "cred")]
 impl CredentialHelper {
     /// Create a new credential helper object which will be used to probe git's
     /// local credential configuration.
@@ -292,6 +296,12 @@ impl CredentialHelper {
     // see https://www.kernel.org/pub/software/scm/git/docs/technical
     //                           /api-credentials.html#_credential_helpers
     fn add_command(&mut self, cmd: Option<&str>) {
+        fn is_absolute_path(path: &str) -> bool {
+            path.starts_with('/')
+                || path.starts_with('\\')
+                || cfg!(windows) && path.chars().nth(1).is_some_and(|x| x == ':')
+        }
+
         let cmd = match cmd {
             Some("") | None => return,
             Some(s) => s,
@@ -352,6 +362,9 @@ impl CredentialHelper {
         cmd: &str,
         username: &Option<String>,
     ) -> (Option<String>, Option<String>) {
+        use std::io::Write;
+        use std::process::{Command, Stdio};
+
         macro_rules! my_try( ($e:expr) => (
             match $e {
                 Ok(e) => e,
@@ -481,13 +494,8 @@ impl CredentialHelper {
     }
 }
 
-fn is_absolute_path(path: &str) -> bool {
-    path.starts_with('/')
-        || path.starts_with('\\')
-        || cfg!(windows) && path.chars().nth(1).is_some_and(|x| x == ':')
-}
-
 #[cfg(test)]
+#[cfg(feature = "cred")]
 mod test {
     use std::env;
     use std::fs::File;

src/lib.rs

@@ -88,7 +88,9 @@ pub use crate::buf::Buf;
 pub use crate::cherrypick::CherrypickOptions;
 pub use crate::commit::{Commit, Parents};
 pub use crate::config::{Config, ConfigEntries, ConfigEntry};
-pub use crate::cred::{Cred, CredentialHelper};
+pub use crate::cred::Cred;
+#[cfg(feature = "cred")]
+pub use crate::cred::CredentialHelper;
 pub use crate::describe::{Describe, DescribeFormatOptions, DescribeOptions};
 pub use crate::diff::{Deltas, Diff, DiffDelta, DiffFile, DiffOptions};
 pub use crate::diff::{DiffBinary, DiffBinaryFile, DiffBinaryKind, DiffPatchidOptions};