Error to start Process.Start("/bin/sftp", $"{args}"))

[LukaszGmaj]

I try to run sftp command but the lambda fails with error:
An error occurred trying to start process '/bin/sftp' with working directory '/var/task'. No such file or directory

I tried following paths:
Process.Start("sftp", $"{args}"))
Process.Start("/bin/sftp", $"{args}"))
Process.Start("/usr/bin/sftp", $"{args}"))
Process.Start("$home/bin/sftp", $"{args}"))
Process.Start("../../bin/sftp", $"{args}"))

It looks like it's technically possible - here is suggested solution to similar issue #274:

File.Copy("/var/task/third-party-app", "/tmp/third-party-app", true);
Process.Start("/bin/bash", $"-c chmod +x /tmp/third-party-app");

The way I run the process

Process process = new()
{
    StartInfo = new("/bin/sftp")
    {
        CreateNoWindow = true,
        RedirectStandardInput = true,
        RedirectStandardOutput = true,
        RedirectStandardError = true,
        UseShellExecute = false,
        Arguments = $"-P {settings.SFTP.Port} {settings.SFTP.Username}@{settings.SFTP.Host}"
    }
};
process.Start();

I can't change UseShellExecute to true as this doesn't allow redirect the output.

[ashishdhingra]

@LukaszGmaj Although I'm not sure, the default Lambda runtime image is quite restrictive and minimal in terms of included packages. The error An error occurred trying to start process '/bin/sftp' with working directory '/var/task'. No such file or directory is quite evident. There is no program named /bin/sftp. You may try using your customer runtime image for the Lambda function, where your Docker file includes any 3rd party packages.
Answer:
Thanks,
Ashish

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[LukaszGmaj]

Thanks! Indeed, the sftp is not included in the lambda runtime image. As that has been confirmed I switch to use ssh.net library instead.

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