git: enable libgit2's OpenSSH feature

Cargo.toml

@@ -49,7 +49,9 @@ dunce = "1.0.5"
 either = "1.13.0"
 esl01-renderdag = "0.3.0"
 futures = "0.3.31"
-git2 = { git = "https://github.com/bnjmnt4n/git2-rs.git", rev = "60e29ff0d", features = [
+git2 = { git = "https://github.com/bnjmnt4n/git2-rs.git", rev = "60e29ff0d", default-features = false, features = [
+    "https",
+    "ssh-openssh",
     # Do *not* disable this feature even if you'd like dynamic linking. Instead,
     # set the environment variable `LIBGIT2_NO_VENDOR=1` if dynamic linking must
     # be used (this will override the Cargo feature), and allow static linking

cli/src/commands/git/mod.rs

@@ -90,8 +90,8 @@ fn map_git_error(err: git2::Error) -> CommandError {
                  successfully load certificates. Try setting it to the path of a directory that \
                  contains a `.ssh` directory."
             } else {
-                "Jujutsu uses libssh2, which doesn't respect ~/.ssh/config. Does `ssh -F \
-                 /dev/null` to the host work?"
+                "There was an error creating an SSH connection. Does `ssh -F /dev/null` to the \
+                 host work?"
             };
 
         user_error_with_hint(err, hint)

flake.nix

@@ -99,11 +99,10 @@
             openssh
           ] ++ linuxNativeDeps;
           buildInputs = with pkgs; [
-            openssl zstd libgit2 libssh2
+            openssl zstd libgit2 openssh
           ] ++ darwinDeps;
 
           ZSTD_SYS_USE_PKG_CONFIG = "1";
-          LIBSSH2_SYS_USE_PKG_CONFIG = "1";
           RUSTFLAGS = pkgs.lib.optionalString pkgs.stdenv.isLinux "-C link-arg=-fuse-ld=mold";
           NIX_JJ_GIT_HASH = self.rev or "";
           CARGO_INCREMENTAL = "0";
@@ -153,7 +152,7 @@
           ourRustVersion
 
           # Foreign dependencies
-          openssl zstd libgit2 libssh2
+          openssl zstd libgit2
           pkg-config
 
           # Additional tools recommended by contributing.md
@@ -179,7 +178,6 @@
         shellHook = ''
           export RUST_BACKTRACE=1
           export ZSTD_SYS_USE_PKG_CONFIG=1
-          export LIBSSH2_SYS_USE_PKG_CONFIG=1
 
           export RUSTFLAGS="-Zthreads=0 ${rustLinkFlagsString}"
         '';