enable host key check for ssh.exe

let addOptionsForRemoteBackup (results: ParseResults<CLIArguments>) (logger: Logger) (rsyncCmd: string list) =

    let sshExeFile = mbackupProgramDir + "rsync-w64/usr/bin/ssh.exe"

    let sshConfigFile = userHome + ".ssh/config"

    let sshKnownHostsFile = userHome + ".ssh/known_hosts"

    let sshPrivateKeyFile = results.GetResult(Ssh_Key, defaultValue = userHome + ".ssh/id_rsa") |> toMingwPath

    let sshPrivateKeyFileWin = toWinPath sshPrivateKeyFile

    if not (File.Exists(sshPrivateKeyFileWin)) then

        let rsyncCmd =

            List.append rsyncCmd

                [ sprintf "-e \"'%s'%s -i %s -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null\"" sshExeFile

                      sshConfigFileOption sshPrivateKeyFile ]

                [ sprintf "-e \"'%s'%s -i %s -o StrictHostKeyChecking=ask -o UserKnownHostsFile=%s\""

                          sshExeFile sshConfigFileOption sshPrivateKeyFile sshKnownHostsFile]

        let nodeName = results.GetResult(Node_Name, defaultValue = Net.Dns.GetHostName())

        let remoteLogFile = sprintf "/var/log/mbackup/%s.log" nodeName

    <RuntimeIdentifiers>win10-x64</RuntimeIdentifiers>

    <RootNamespace>Mbackup</RootNamespace>

    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>

    <Version>0.2.3.0</Version>

    <Version>0.2.4.0</Version>

  </PropertyGroup>

  <ItemGroup>

** 2019-11-14 vscode f# doesn't support open a module

it can only support open a namespace.

using the vscode Ionide-fsharp extension.

** 2019-11-16 ssh.exe Could not create directory '/home/IEUser/.ssh' error.

when rsync.exe or ssh.exe is run from cmd.exe, it will always show this error.

HOME env var is defined properly.

- create /etc/nsswitch.conf with the following content didn't fix it.

  db_home: windows

- openssh get user's home dir from getpwuid call.

  Check how ssh get home dir. maybe from /etc/passwd and similar syscall.

  check ssh-keygen source code.

  https://github.com/openssh/openssh-portable/blob/master/ssh-keygen.c

  pw = getpwuid(getuid());

  https://manpages.ubuntu.com/manpages/bionic/en/man3/getpwuid.3.html

  indeed it read config for passwd entry.

  how to bundle passwd file in mingw application?

* current                                                             :entry:

** 

** 2019-11-15 f# indent is difficult in vscode.

Both local.list and local.exclude.

** 2019-11-16 support reading remote-user=xxx option from config file.

cli arg > env var > config file.

same with target option.

** 2019-11-14 learn how to create an msi installer.

- WiX Toolset

  https://wixtoolset.org/

    maybe show a installer window and let user click Next and Finish.

  - TODO how to add some dir to PATH?

    I only have one exe. Maybe just create a start menu or desktop shortcut?

    create desktop shortcut to mbackup.exe

    DONE create desktop shortcut to mbackup.exe

    installer - Create shortcut to desktop using WiX - Stack Overflow

    https://stackoverflow.com/questions/11868499/create-shortcut-to-desktop-using-wix

    it works.

        // set HOME dir on system level works on B75I3. maybe when rsync invoke ssh, env variable is lost.

        // if system level env variable is required, set HOME when msi is installed if HOME is not set.

        *now*

        in admin powershell,

        setx HOME ^%USERPROFILE^%

        // try mbackup to remote node, nope.

        setx HOME $env:userprofile

        // try mbackup to remote node, nope.

        how to make HOME work in the Win 10 GUEST?

        TODO Maybe I need to create the rsync zip file using a Dockerfile. LATER.

        And include bash or getenv tool for debugging. Does my rsync tool include bash? yes.

        on B75I3,

        .\bash.exe

        echo $HOME

        /cygdrive/c/Users/sylecn

        on Win10 Guest,

        .\bash.exe

        bash.exe: warning: could not find /tmp, please create!

        echo $HOME

        /cygdrive/c/Users/IEUser

        // looks HOME var is alright. ssh is not using HOME env variable.

        ssh-keygen works fine in bash shell. so bash setup some variable for use with ssh tools.

        after reboot, run ssh-keygen directly in cmd.exe also works.

        When run ssh.exe from cmd.exe, it still complains about HOME dir.

        Could not create directory '/home/IEUser/.ssh'.

        I think I know the problem. When start bash.exe, it will convert all path in PATH, HOME to cygdrive style.

        When start ssh.exe directly, HOME dir is still in windows style.

        Try set HOME to cygdrive style and run ssh.exe.

        how to set env var for current shell only in windows?

        set HOME=/cygdrive/c/Users/IEUser

        ssh.exe ...

        Could not create directory '/home/IEUser/.ssh'.

        search: mingw HOME

        HOWTO Set the HOME variable for cmd exe | MinGW

        http://www.mingw.org/wiki/HOWTO_Set_the_HOME_variable_for_cmd_exe

        Ubuntu Manpage: ssh — OpenSSH SSH client (remote login program)

        https://manpages.ubuntu.com/manpages/bionic/en/man1/ssh.1.html

        ssh will set HOME env var, not read it.

        Check how ssh get home dir. maybe from /etc/passwd and similar syscall.

        check ssh-keygen source code.

        https://github.com/openssh/openssh-portable/blob/master/ssh-keygen.c

        pw = getpwuid(getuid());

        https://manpages.ubuntu.com/manpages/bionic/en/man3/getpwuid.3.html

        indeed it read config for passwd entry.

        how to bundle passwd file in mingw application?

        Configure sshd on MSYS2 and run it as a Windows service · GitHub

        https://gist.github.com/samhocevar/00eec26d9e9988d080ac

        /etc/nsswitch.conf

        db_home: windows

        // what does this do? I think it only change HOME, doesn't work for getpwuid call.

        http://manpages.ubuntu.com/manpages/precise/man5/nsswitch.conf.5.html

        nsswitch can manage how system read passwd db. cool.

        after updating /etc/nsswitch.conf, all MSYS applications and terminals must be

        closed, as the configuration is only read once at MSYS DLL load time.

        try db_home: windows again. reboot and test.

        it doesn't work.

        why it works on B75I3? what's different?

        this is all about UserKnownHostsFile? just specify a path for this option.

        after adding UserKnownHostsFile to point to existing file, ssh still wants to create /home/<user>/.ssh dir.

        I will leave this problem. It's harmless for my use case.

      - System.ArgumentException: Value does not fall within the expected range.

        this happens when I run dotnet run on B75I3 dev node.

        what is this error?