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sftp: auto-detect shell type for fish

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Fish is different from POSIX-based Unix shells such as bash,
and a bracketed variable references like we use for the
auto-detection echo command is not supported. The command
will return with zero exit code but produce no output on
stdout. There is a message on stderr, but we don't log it
due to the zero exit code:

fish: Variables cannot be bracketed. In fish, please use {$ShellId}.

Fixes #6552
This commit is contained in:
albertony 2022-11-08 18:52:39 +01:00 committed by Nick Craig-Wood
parent 0e427216db
commit 1392793334
1 changed files with 12 additions and 8 deletions
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20
backend/sftp/sftp.go
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@ -975,20 +975,24 @@ func NewFsWithConnection(ctx context.Context, f *Fs, name string, root string, m
fs.Debugf(f, "Running shell type detection remote command: %s", shellCmd)
err = session.Run(shellCmd)
_ = session.Close()
f.shellType = defaultShellType
if err != nil {
f.shellType = defaultShellType
fs.Debugf(f, "Remote command failed: %v (stdout=%v) (stderr=%v)", err, bytes.TrimSpace(stdout.Bytes()), bytes.TrimSpace(stderr.Bytes()))
} else {
outBytes := stdout.Bytes()
fs.Debugf(f, "Remote command result: %s", outBytes)
outString := string(bytes.TrimSpace(stdout.Bytes()))
if strings.HasPrefix(outString, "Microsoft.PowerShell") { // If PowerShell: "Microsoft.PowerShell%ComSpec%"
f.shellType = "powershell"
} else if !strings.HasSuffix(outString, "%ComSpec%") { // If Command Prompt: "${ShellId}C:\WINDOWS\system32\cmd.exe"
f.shellType = "cmd"
} else { // If Unix: "%ComSpec%"
f.shellType = "unix"
}
if outString != "" {
if strings.HasPrefix(outString, "Microsoft.PowerShell") { // PowerShell: "Microsoft.PowerShell%ComSpec%"
f.shellType = "powershell"
} else if !strings.HasSuffix(outString, "%ComSpec%") { // Command Prompt: "${ShellId}C:\WINDOWS\system32\cmd.exe"
// Additional positive test, to avoid misdetection on unpredicted Unix shell variants
s := strings.ToLower(outString)
if strings.Contains(s, ".exe") || strings.Contains(s, ".com") {
f.shellType = "cmd"
}
} // POSIX-based Unix shell: "%ComSpec%"
} // fish Unix shell: ""
}
}
// Save permanently in config to avoid the extra work next time