fix: exit with error code on failure (#1014)

/// --smithy-rs /Users/zhessler/Documents/smithy-rs-test/ \

/// --aws-sdk /Users/zhessler/Documents/aws-sdk-rust-test/

/// ```

fn main() {

fn main() -> Result<()> {

    let Opt {

        smithy_rs,

        aws_sdk,

        branch,

    } = Opt::from_args();

    if let Err(e) = sync_aws_sdk_with_smithy_rs(&smithy_rs, &aws_sdk, &branch) {

        eprintln!("Sync failed with error: {:?}", e);

    };

    sync_aws_sdk_with_smithy_rs(&smithy_rs, &aws_sdk, &branch)

        .map_err(|e| e.context("The sync failed"))

}

/// Run through all commits made to `smithy-rs` since last sync and "replay" them onto `aws-sdk-rust`.

fn sync_aws_sdk_with_smithy_rs(smithy_rs: &Path, aws_sdk: &Path, branch: &str) -> Result<()> {

    eprintln!(

        "aws-sdk-rust path:\t{}",

        aws_sdk.canonicalize().context(here!())?.display()

    );

    eprintln!(

        "smithy-rs path:\t{}",

        smithy_rs.canonicalize().context(here!())?.display()

    );

    // Open the repositories we'll be working with

    let smithy_rs_repo = Repository::open(smithy_rs).context("couldn't open smithy-rs repo")?;

    let aws_sdk_repo = Repository::open(aws_sdk).context("couldn't open aws-sdk-rust repo")?;