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|
use std::env;
use std::fs::File;
use std::io::Write;
use std::path::{Path, PathBuf};
use std::collections::HashMap;
use anyhow::Result;
struct PkgConfigTemplate {
cargo_toml: HashMap<String, String>,
pc_in: String,
}
impl PkgConfigTemplate {
/// Read the pkg-config template file.
fn new<P, S>(src: P, pc_in: S) -> Result<Self>
where P: AsRef<Path>, S: AsRef<str>
{
let src = src.as_ref();
let mut pc_in_ = PathBuf::from(src);
pc_in_.push(pc_in.as_ref());
let pc_in = pc_in_;
let pc_in = std::fs::read_to_string(pc_in)?;
let cargo_toml = HashMap::from([
("NAME".to_string(), env!("CARGO_PKG_NAME").to_string()),
("DESCRIPTION".to_string(), env!("CARGO_PKG_DESCRIPTION").to_string()),
("VERSION".to_string(), env!("CARGO_PKG_VERSION").to_string()),
("HOMEPAGE".to_string(), env!("CARGO_PKG_HOMEPAGE").to_string()),
("REQUIRES".to_string(),
if cfg!(feature = "crypto-botan") {
"botan-3"
} else if cfg!(feature = "crypto-botan2") {
"botan-2"
} else if cfg!(feature = "crypto-nettle") {
"nettle"
} else if cfg!(feature = "crypto-openssl") {
"libssl"
} else if cfg!(feature = "crypto-cng") {
""
} else if cfg!(feature = "crypto-rust") {
""
} else {
panic!("No cryptographic backend selected. Try: \
\"cargo build --no-default-features \
--features crypto-openssl\"")
}.to_string()),
]);
Ok(PkgConfigTemplate {
cargo_toml,
pc_in,
})
}
/// Perform substitutions on the pkg-config file based on what was
/// read from the Cargo.toml file and the provided substitution
/// map.
///
/// The mappings in the substitution map are preferred to those in
/// the Cargo.toml file.
///
/// Substitutions take the form of keys and values where the
/// string @KEY@ is substituted with the value of KEY. So,
/// @VERSION@ is substituted with the value of VERSION.
fn substitute(&self, map: HashMap<String, String>) -> Result<String> {
let mut pc: String = self.pc_in.clone();
for (key, value) in map.iter().chain(self.cargo_toml.iter()) {
pc = pc.replace(&format!("@{}@", key), value);
}
Ok(pc)
}
}
fn main() -> Result<(), anyhow::Error> {
// Generate
// ${CARGO_TARGET_DIR}/${PROFILE}/rpm-sequoia{-uninstalled}.pc
// from ${SRC}/rpm-sequoia.pc.in.
let src = env::current_dir()?;
// Location of the build directory (e.g.,
// `/tmp/rpm-sequoia/debug`).
let mut build_dir = PathBuf::from(&src);
if let Some(target_dir) = env::var_os("CARGO_TARGET_DIR") {
// Note: if CARGO_TARGET_DIR is absolute, this will first
// clear build_dir, which is what we want.
build_dir.push(target_dir);
} else {
build_dir.push("target");
}
let profile = env::var_os("PROFILE").expect("PROFILE not set");
build_dir.push(&profile);
let pc_in = PkgConfigTemplate::new(&src, "rpm-sequoia.pc.in")?;
// Generate rpm-sequoia.pc.
let mut pc = build_dir.clone();
pc.push("rpm-sequoia.pc");
let prefix = env::var_os("PREFIX");
let prefix: &str = match prefix.as_ref().map(|s| s.to_str()) {
Some(Some(s)) => s,
Some(None) => Err(anyhow::anyhow!("PREFIX contains invalid UTF-8"))?,
None => "/usr/local",
};
let libdir = env::var_os("LIBDIR");
let libdir: &str = match libdir.as_ref().map(|s| s.to_str()) {
Some(Some(s)) => s,
Some(None) => Err(anyhow::anyhow!("LIBDIR contains invalid UTF-8"))?,
None => "${prefix}/lib",
};
let content = pc_in.substitute(HashMap::from([
("PREFIX".to_string(), prefix.into()),
("LIBDIR".to_string(), libdir.into()),
]))?;
let mut pc = File::create(&pc).unwrap_or_else(
|_| panic!("Creating {:?} (CARGO_TARGET_DIR: {:?})",
pc, env::var_os("CARGO_TARGET_DIR")));
pc.write_all(content.as_bytes())?;
// Generate rpm-sequoia-uninstalled.pc.
let mut pc = build_dir.clone();
pc.push("rpm-sequoia-uninstalled.pc");
let content = pc_in.substitute(HashMap::from([
("PREFIX".to_string(),
build_dir.to_str()
.expect("build directory is not valid UTF-8").to_string()),
("LIBDIR".to_string(), "${prefix}".into()),
]))?;
let mut pc = File::create(&pc).unwrap_or_else(
|_| panic!("Creating {:?} (CARGO_TARGET_DIR: {:?})",
pc, env::var_os("CARGO_TARGET_DIR")));
pc.write_all(content.as_bytes())?;
// Rerun if...
println!("cargo:rerun-if-changed=build.rs");
println!("cargo:rerun-if-changed=Cargo.toml");
println!("cargo:rerun-if-changed=rpm-sequoia.pc.in");
println!("cargo:rerun-if-env-changed=PREFIX");
println!("cargo:rerun-if-env-changed=LIBDIR");
println!("cargo:rerun-if-env-changed=PROFILE");
println!("cargo:rerun-if-env-changed=CARGO_TARGET_DIR");
// Set the soname.
let arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
let os = env::var("CARGO_CFG_TARGET_OS").unwrap();
let env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
// We do not care about `_pre` and such.
let major = env::var("CARGO_PKG_VERSION_MAJOR").unwrap();
let minor = env::var("CARGO_PKG_VERSION_MINOR").unwrap();
let patch = env::var("CARGO_PKG_VERSION_PATCH").unwrap();
// libdir might contain "${prefix}". Replace it with
// the actual prefix value if found.
let libdir_resolved = libdir.replace("${prefix}", prefix);
let linker_lines = cdylib_link_lines::shared_object_link_args(
"rpm_sequoia",
&major, &minor, &patch, &arch, &os, &env,
PathBuf::from(libdir_resolved), build_dir.clone(),
);
for line in linker_lines {
println!("cargo:rustc-cdylib-link-arg={}", line);
}
#[cfg(unix)]
{
// Create a symlink.
let mut create = true;
let mut link = build_dir.clone();
link.push(format!("librpm_sequoia.so.{}", major));
if let Ok(current) = std::fs::read_link(&link) {
if current.to_str() == Some("librpm_sequoia.so") {
// Do nothing.
create = false;
} else {
// Invalid.
std::fs::remove_file(&link)?;
}
}
if create {
std::os::unix::fs::symlink("librpm_sequoia.so", link)?;
}
}
Ok(())
}
|
