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Windows command line arguments - problems with " and \ #464

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left1000 opened this issue Apr 30, 2016 · 8 comments

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@left1000
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commented Apr 30, 2016

rclone copy -v --log-file=logfile.txt "F:" "remote:Windows Fat"

http://pastebin.com/MQzkR18y

doesn't work at all, error makes no sense and for some reason rclone creates new folders inside it's own folder named Fat and Fat_

yet somehow
rclone copy -v --log-file=logfile.txt "F:\4" "remote:Windows Fat\4"
worked perfectly! but... ideally I'd like to backup this entire drive all at once and I have no idea why I can't

I very clumsily moved every single file from the F drive into a subfolder of F:\ called F and then the transfer copy command worked

I tried this in 1.27 and 1.29

oh in case it wasn't clear "Fat" is what I named the drive because it's in fat32 because I used it a long time ago. I'm not sure if that matters.

@ncw

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commented Apr 30, 2016

After a quick look this does look like a bug. Rclone is treating "remote:Windows Fat" as a local directory rather than a remote. Will investigate further!

@left1000

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commented Apr 30, 2016

is it because I started with a root drive? or because of fat32? or windows keyword? either way it's baffling how simple the workaround is...

@ncw

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commented Apr 30, 2016

I'm away from my computer at the moment - I'll check the source when I get back and all will become clear!

@klauspost

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commented May 1, 2016

Use F:\ (no quotes).

However, there is something weird in the args parsing. "f:\" is not the same as f:\. Something is doing some escape-stuff. Windows explicitly claims not to do escape processing on \, so it may be some quirk with the flag parser.

@ncw

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commented May 2, 2016

I think you must have written this originally

rclone copy -v --log-file=logfile.txt "F:\" "remote:Windows Fat"

In the pastebin the first line is

2016/04/29 20:35:26 Local file system at : Replacing invalid characters in "\" remote:Windows" to "F:_ remote_Windows"

indicating that Windows thought rclone was being run with two arguments

  • F:\" remote:Windows
  • Fat

So I think this is caused by oddities in the windows command line parser as Klaus suggested, so

rclone copy -v --log-file=logfile.txt F:\ "remote:Windows Fat"

Should fix it

This is caused ultimately by CommandLineToArgvW which states:

CommandLineToArgvW has a special interpretation of backslash characters when they are followed by a quotation mark character ("), as follows:

  • 2n backslashes followed by a quotation mark produce n backslashes followed by a quotation mark.
  • (2n) + 1 backslashes followed by a quotation mark again produce n backslashes followed by a quotation mark.
  • n backslashes not followed by a quotation mark simply produce n backslashes.

The original command line had a mis-matched quote " so it would have been nice if it had given an error.

@ncw ncw changed the title I'm sorry this is a basic question but what am I doing wrong here? Windows command line arguments - problems with " and \ May 2, 2016

@left1000

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commented May 6, 2016

thanks guys, that answers that, sorry for such a silly question! I'll remember this for the future.

@ncw

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commented May 6, 2016

@left1000 I don't think this is a silly question at all - it exposes a bit of windows oddness. I should probably put this either in the docs somewhere!

@ncw ncw referenced this issue May 6, 2016
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commented May 6, 2016

I've made another issue to write some more docs on the windows shell here #473

I'll close this ticket now as I think we've got to the bottom of it.

@ncw ncw closed this May 6, 2016

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