Canister type "custom" getting Permission Denied error

Fulco · February 26, 2022, 11:28pm

I’m trying to build a general canister that people can use to embed their frontend into the canister binary instead of using the asset canister.

I’m trying to copy the same mechanism as in the nns dapp nns-dapp/dfx.json at main · dfinity/nns-dapp · GitHub with a custom build script that creates a .tar of the frontend assets. However when I try to use the “custom” canister type I get the following error:

thread 'main' panicked at 'Could not run custom tool.: Os { code: 13, kind: PermissionDenied, message: "Permission denied" }', src/dfx/src/lib/builders/custom.rs:207:31

When I look at the source code of the SDK the line numbers don’t go that far. Does anybody know where that error could come from?

github.com

dfinity/sdk/blob/master/src/dfx/src/lib/builders/custom.rs

use crate::lib::builders::{
    BuildConfig, BuildOutput, CanisterBuilder, IdlBuildOutput, WasmBuildOutput,
};
use crate::lib::canister_info::CanisterInfo;
use crate::lib::environment::Environment;
use crate::lib::error::{BuildError, DfxError, DfxResult};
use crate::lib::models::canister::CanisterPool;

use anyhow::{anyhow, Context};
use console::style;
use ic_types::principal::Principal as CanisterId;
use serde::Deserialize;
use slog::info;
use slog::Logger;
use std::path::PathBuf;
use std::process::Stdio;

/// Set of extras that can be specified in the dfx.json.
struct CustomBuilderExtra {
    /// A list of canister names to use as dependencies.

This file has been truncated. show original

paulyoung · February 27, 2022, 12:25am

I think you’d need to try looking at the tag of an older version, e.g.

github.com

dfinity/sdk/blob/066c0f9951ed1f03b747d52f323fd6338b814e55/src/dfx/src/lib/builders/custom.rs#L207

      
        
                            IdlBuildOutput::File(p) => p.as_os_str(),
                        };
            
            
            cmd.env(
                            format!("CANISTER_CANDID_{}", canister.get_name()),
                            candid_path,
                        );
                    }
                }
            
            
    let output = cmd.output().expect("Could not run custom tool.");
                if output.status.success() {
                    Ok(())
                } else {
                    Err(DfxError::new(BuildError::CustomToolError(
                        output.status.code(),
                    )))
                }
            }

Fulco · February 27, 2022, 9:28am

For anyone seeing this in the future I had to make the build,sh script executable with:

chmod +x build.sh

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Canister type "custom" getting Permission Denied error

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