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libgit2: Add support for OpenSSH instead of libssh2 #1031

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libgit2: Add support for OpenSSH instead of libssh2 #1031

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6 changes: 4 additions & 2 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -34,11 +34,13 @@ tempfile = "3.1.0"
[features]
unstable = []
default = ["ssh", "https", "ssh_key_from_memory"]
ssh = ["libgit2-sys/ssh"]
ssh = ["ssh-libssh2"]
ssh-libssh2 = ["libgit2-sys/ssh-libssh2"]
ssh-openssh = ["libgit2-sys/ssh-openssh"]
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Can this (and libgit2-sys/Cargo.toml) comment that the openssh support is experimental with a comment here? Perhaps something like:

Suggested change
ssh-openssh = ["libgit2-sys/ssh-openssh"]
# Support for ssh-openssh is experimental.
ssh-openssh = ["libgit2-sys/ssh-openssh"]

Also, I'm a little uncertain about the interaction if both ssh-libssh2 and ssh-openssh is set. From what I can gather, ssh-libssh2 takes precedence, is that correct? That seems like it could potentially be awkward or confusing or difficult to get it configured properly, particularly with ssh-libssh2 in the default set, and with cargo's feature unification. I suspect it won't be obvious to most people who just see this list of features in Cargo.toml.

Some options for how this could be handled:

  • Document the interaction.
  • Remove ssh from the default set, and make it more explicit.
  • Detect if both are set and raise a compile-time error.

Unfortunately none of these seem like great options.

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If both features are set, I think libssh2 will take precedence, because we are just adding #define instructions, and the #ifdef in the libgit2 codebase appears to always check for libssh2 first. (example).

If we do (3), my understanding is that we would need to add more environment variables similar to LIBGIT2_NO_VENDOR to allow explicit disabling of one of the features? (Correct me if I'm wrong.) This makes it seems like doing (1) + (2) would be better.

ssh_key_from_memory = ["libgit2-sys/ssh_key_from_memory"]
https = ["libgit2-sys/https", "openssl-sys", "openssl-probe"]
vendored-libgit2 = ["libgit2-sys/vendored"]
vendored-openssl = ["openssl-sys/vendored", "libgit2-sys/vendored-openssl"]
ssh_key_from_memory = ["libgit2-sys/ssh_key_from_memory"]
zlib-ng-compat = ["libgit2-sys/zlib-ng-compat"]

[workspace]
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6 changes: 4 additions & 2 deletions libgit2-sys/Cargo.toml
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Expand Up @@ -33,9 +33,11 @@ cc = { version = "1.0.43", features = ['parallel'] }
openssl-sys = { version = "0.9.45", optional = true }

[features]
ssh = ["libssh2-sys"]
ssh = ["ssh-libssh2"]
ssh-libssh2 = ["libssh2-sys"]
ssh-openssh = []
ssh_key_from_memory = ["ssh-libssh2"]
https = ["openssl-sys"]
ssh_key_from_memory = []
vendored = []
vendored-openssl = ["openssl-sys/vendored"]
zlib-ng-compat = ["libz-sys/zlib-ng", "libssh2-sys?/zlib-ng-compat"]
17 changes: 13 additions & 4 deletions libgit2-sys/build.rs
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Expand Up @@ -23,7 +23,9 @@ fn try_system_libgit2() -> Result<pkg_config::Library, pkg_config::Error> {

fn main() {
let https = env::var("CARGO_FEATURE_HTTPS").is_ok();
let ssh = env::var("CARGO_FEATURE_SSH").is_ok();
let ssh_libssh2 = env::var("CARGO_FEATURE_SSH_LIBSSH2").is_ok();
let ssh_libssh2_key_from_memory = env::var("CARGO_FEATURE_SSH_KEY_FROM_MEMORY").is_ok();
let ssh_openssh = env::var("CARGO_FEATURE_SSH_OPENSSH").is_ok();
let vendored = env::var("CARGO_FEATURE_VENDORED").is_ok();
let zlib_ng_compat = env::var("CARGO_FEATURE_ZLIB_NG_COMPAT").is_ok();

Expand Down Expand Up @@ -176,13 +178,20 @@ The build is now aborting. To disable, unset the variable or use `LIBGIT2_NO_VEN
features.push_str("#define GIT_ARCH_64 1\n");
}

if ssh {
if ssh_openssh || ssh_libssh2 {
if let Some(path) = env::var_os("DEP_SSH2_INCLUDE") {
cfg.include(path);
}
features.push_str("#define GIT_SSH 1\n");
features.push_str("#define GIT_SSH_LIBSSH2 1\n");
features.push_str("#define GIT_SSH_LIBSSH2_MEMORY_CREDENTIALS 1\n");
if ssh_openssh {
features.push_str("#define GIT_SSH_EXEC 1\n");
}
if ssh_libssh2 {
features.push_str("#define GIT_SSH_LIBSSH2 1\n");
if ssh_libssh2_key_from_memory {
features.push_str("#define GIT_SSH_LIBSSH2_MEMORY_CREDENTIALS 1\n");
}
}
}
if https {
features.push_str("#define GIT_HTTPS 1\n");
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6 changes: 3 additions & 3 deletions libgit2-sys/lib.rs
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Expand Up @@ -5,7 +5,7 @@
extern crate libz_sys as libz;

use libc::{c_char, c_int, c_uchar, c_uint, c_void, size_t};
#[cfg(feature = "ssh")]
#[cfg(feature = "ssh-libssh2")]
use libssh2_sys as libssh2;
use std::ffi::CStr;

Expand Down Expand Up @@ -4334,12 +4334,12 @@ pub fn openssl_init() {
#[doc(hidden)]
pub fn openssl_init() {}

#[cfg(feature = "ssh")]
#[cfg(feature = "ssh-libssh2")]
fn ssh_init() {
libssh2::init();
}

#[cfg(not(feature = "ssh"))]
#[cfg(not(feature = "ssh-libssh2"))]
fn ssh_init() {}

#[doc(hidden)]
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2 changes: 1 addition & 1 deletion src/cred.rs
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Expand Up @@ -659,7 +659,7 @@ echo password=$2
}

#[test]
#[cfg(feature = "ssh")]
#[cfg(feature = "ssh-libssh2")]
fn ssh_key_from_memory() {
let cred = Cred::ssh_key_from_memory(
"test",
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2 changes: 1 addition & 1 deletion systest/Cargo.toml
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Expand Up @@ -6,7 +6,7 @@ build = "build.rs"
edition = "2018"

[dependencies]
libgit2-sys = { path = "../libgit2-sys", features = ['https', 'ssh'] }
libgit2-sys = { path = "../libgit2-sys", features = ['https', 'ssh-libssh2'] }
libc = "0.2"

[build-dependencies]
Expand Down