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cargo-build-bpf: allow sdk path to be set by environment variables 

In many Linux distros such as NixOS, the directory in which packages are
installed is assumed to be read-only. To work around this, it is
expected that the filepaths which packaged CLI tools take in are able to
be freely configured through either 1) command-line flags, 2)
environment variables, or 3) a configuration file.

In this commit, environment variables 'BPF_SDK_PATH' and 'BPF_OUT_PATH',
which map respectively to command-line flags '--bpf-sdk-path' and
'--bpf-out-dir', are now handled in cargo-build-bpf.

Additionally, given that arbitrary filepaths may now be set in which the
BPF SDK is located, the requirement in which
'$BPF_SDK_PATH/dependencies/bpf-tools' must strictly be a symbolic link
to the directory '$HOME/.cache/solana/${bpf-tools.version}/bpf-tools has
been relaxed.

Ideally, the directory in which bpf-tools is expected to be downloaded
to and stored should be configurable. Though, this commit serves as a
temporary fix which enables NixOS users to now start being able to build
applications with the Solana SDK.
This commit is contained in:
Kenta Iwasaki 2021-08-31 02:27:20 +09:00 committed by Dmitri Makarov
parent d11b0abf11
commit 4ad7069827
1 changed files with 11 additions and 13 deletions
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24
sdk/cargo-build-bpf/src/main.rs
View File

@ -131,7 +131,13 @@ fn install_if_missing(
.join("solana")
.join(version)
.join(package);
if !target_path.is_dir() {
if !target_path.is_dir()
&& !target_path
.symlink_metadata()
.map(|metadata| metadata.file_type().is_symlink())
.unwrap_or(false)
{
if target_path.exists() {
fs::remove_file(&target_path).map_err(|err| err.to_string())?;
}
@ -150,7 +156,7 @@ fn install_if_missing(
.map_err(|err| err.to_string())?;
fs::remove_file(file).map_err(|err| err.to_string())?;
}
// Make a symbolyc link source_path -> target_path in the
// Make a symbolic link source_path -> target_path in the
// sdk/bpf/dependencies directory if no valid link found.
let source_base = config.bpf_sdk.join("dependencies");
if !source_base.exists() {
@ -158,17 +164,7 @@ fn install_if_missing(
}
let source_path = source_base.join(package);
// Check whether the correct symbolic link exists.
let invalid_link = if let Ok(link_target) = source_path.read_link() {
if link_target != target_path {
fs::remove_file(&source_path).map_err(|err| err.to_string())?;
true
} else {
false
}
} else {
true
};
if invalid_link {
if source_path.read_link().is_err() {
#[cfg(unix)]
std::os::unix::fs::symlink(target_path, source_path).map_err(|err| err.to_string())?;
#[cfg(windows)]
@ -659,6 +655,7 @@ fn main() {
.version(crate_version!())
.arg(
Arg::with_name("bpf_out_dir")
.env("BPF_OUT_PATH")
.long("bpf-out-dir")
.value_name("DIRECTORY")
.takes_value(true)
@ -666,6 +663,7 @@ fn main() {
)
.arg(
Arg::with_name("bpf_sdk")
.env("BPF_SDK_PATH")
.long("bpf-sdk")
.value_name("PATH")
.takes_value(true)