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Add validation of -n and -c options

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This commit is contained in:
Kenjiro Nakayama 2016-08-01 21:46:09 +09:00
parent f304ec9e53
commit 5edffb6025
1 changed files with 7 additions and 4 deletions
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11
command/fs.go
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@ -56,8 +56,8 @@ FS Specific Options:
Show file stat information instead of displaying the file, or listing the directory.
-f
Causes the output to not stop when the end of the file is reached, but
rather to wait for additional output.
Causes the output to not stop when the end of the file is reached, but rather to
wait for additional output.
-tail
Show the files contents with offsets relative to the end of the file. If no
@ -68,7 +68,7 @@ FS Specific Options:
of the file.
-c
Sets the tail location in number of bytes relative to the end of the file.
Sets the tail location in number of bytes relative to the end of the file.
`
return strings.TrimSpace(helpText)
}
@ -262,7 +262,10 @@ func (f *FSCommand) Run(args []string) int {
var offset int64 = defaultTailLines * bytesToLines
if nLines, nBytes := numLines != -1, numBytes != -1; nLines && nBytes {
f.Ui.Error("Both -n and -c set")
f.Ui.Error("Both -n and -c are not allowed")
return 1
} else if numLines < -1 || numBytes < -1 {
f.Ui.Error("Invalid size is specified")
return 1
} else if nLines {
offset = numLines * bytesToLines