PowerBuilder

Resolve an Absolute Remote Path with SFTP RealPath

Demonstrates the Chilkat SFtp.RealPath method, which asks the server to canonicalize a path and returns the resulting absolute remote path. The first argument is the original path and the second is an optional compose path (SFTP v5 or later); pass an empty string when no composition is needed.

Background: The server — not the client — owns the remote filesystem's layout, so path canonicalization must happen on the server. RealPath resolves ., .., and symbolic links into a single absolute path, which is the reliable way to learn the session's home directory (canonicalize .) or to turn a relative path into an absolute one before storing or displaying it. On SFTP v5 and later, the compose path can additionally join or override the original.

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integer li_rc
integer li_Success
oleobject loo_Sftp
integer li_Port
string ls_Password
string ls_HomeDir
string ls_Resolved

li_Success = 0

//  Demonstrates the SFtp.RealPath method, which asks the server to canonicalize a path and
//  returns the resulting absolute remote path.  The 1st argument is the original path and the
//  2nd is an optional compose path (SFTP v5+), which may be an empty string.

loo_Sftp = create oleobject
li_rc = loo_Sftp.ConnectToNewObject("Chilkat.SFtp")
if li_rc < 0 then
    destroy loo_Sftp
    MessageBox("Error","Connecting to COM object failed")
    return
end if

//  Step 1: Connect the SSH transport.  Port 22 is the usual port.
li_Port = 22
li_Success = loo_Sftp.Connect("sftp.example.com",li_Port)
if li_Success = 0 then
    Write-Debug loo_Sftp.LastErrorText
    destroy loo_Sftp
    return
end if

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
ls_Password = "mySshPassword"

li_Success = loo_Sftp.AuthenticatePw("mySshLogin",ls_Password)
if li_Success = 0 then
    Write-Debug loo_Sftp.LastErrorText
    destroy loo_Sftp
    return
end if

//  Step 3: Open the SFTP subsystem.  This must be done after authentication and before any
//  file or directory operations.
li_Success = loo_Sftp.InitializeSftp()
if li_Success = 0 then
    Write-Debug loo_Sftp.LastErrorText
    destroy loo_Sftp
    return
end if

//  Resolve "." to the absolute path of the session's default (home) directory.  No compose path
//  is needed, so the 2nd argument is an empty string.
ls_HomeDir = loo_Sftp.RealPath(".","")
if loo_Sftp.LastMethodSuccess = 0 then
    Write-Debug loo_Sftp.LastErrorText
    destroy loo_Sftp
    return
end if

Write-Debug "Home directory: " + ls_HomeDir

//  Canonicalize a relative path with "..", resolving it to an absolute path.
ls_Resolved = loo_Sftp.RealPath("subdir/../otherdir","")
if loo_Sftp.LastMethodSuccess = 0 then
    Write-Debug loo_Sftp.LastErrorText
    destroy loo_Sftp
    return
end if

Write-Debug "Resolved path: " + ls_Resolved

loo_Sftp.Disconnect()


destroy loo_Sftp