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130 lines
6.3 KiB
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[#]: subject: (Copy files between Linux and FreeDOS)
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[#]: via: (https://opensource.com/article/21/6/copy-files-linux-freedos)
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[#]: author: (Jim Hall https://opensource.com/users/jim-hall)
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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Copy files between Linux and FreeDOS
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======
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Here's how I transfer files between my FreeDOS virtual machine and my
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Linux desktop system.
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![Files in a folder][1]
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I run Linux as my primary operating system, and I boot FreeDOS in a virtual machine. Most of the time, I use QEMU as my PC emulator, but sometimes I'll run other experiments with GNOME Boxes (which uses QEMU as a back-end virtual machine) or with VirtualBox.
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I like to play classic DOS games, and sometimes I'll bring up a favorite DOS application. I teach a Management Information Systems (MIS) class where I talk about the history of computing, and I'll sometimes record a demonstration using FreeDOS and a legacy DOS application, such as As-Easy-As (my favorite DOS spreadsheet—once released as "shareware" but now available [for free from TRIUS, Inc][2]).
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But using FreeDOS this way means I need to transfer files between my FreeDOS virtual machine and my Linux desktop system. Let me show you how I do that.
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### Accessing the image with guestmount
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I used to access my virtual disk image by calculating the offset to the first DOS partition, then calling the Linux `mount` command with the right mix of options to match that offset. This was always error-prone and not very flexible. Fortunately, there's an easier way to do it. The `guestmount` program from the [libguestfs-tools][3] package lets you access or _mount_ the virtual disk image from Linux. You can install `libguestfs-tools` using this command on Fedora:
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```
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`$ yum install libguestfs-tools libguestfs`
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```
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Using `guestmount` is not as easy as double-clicking the file from the GNOME file manager, but the command line isn't too difficult to use. The basic usage of `guestmount` is:
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```
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`$ guestmount -a image -m device mountpoint`
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```
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In this usage, _image_ is the virtual disk image to use. On my system, I created my QEMU virtual disk image with the `qemu-img` command. The g`uestmount` program can read this disk image format, as well as the QCOW2 image format used by GNOME Boxes, or the VDI image format used in VirtualBox.
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The _device_ option indicates the partition on the virtual disk. Imagine using this virtual disk as a real hard drive. You would access the first partition as `/dev/sda1`, the second partition as `/dev/sda2`, and so on. That's the syntax for `guestmount`. By default, FreeDOS 1.3 RC4 creates one partition on an empty drive, so access that partition as `/dev/sda1`.
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And _mountpoint_ is the location to "mount" the DOS filesystem on your local Linux system. I'll usually create a temporary directory to work with. You only need the mount point while you're accessing the virtual disk.
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Putting that all together, I use this set of commands to access my FreeDOS virtual disk image from Linux:
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```
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$ mkdir /tmp/freedos
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$ guestmount -a freedos.img -m /dev/sda1 /tmp/freedos
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```
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After that, I can access my FreeDOS files via the `/tmp/freedos` directory, using normal tools on Linux. I might use `ls /tmp/freedos` at the command line, or open the `/tmp/freedos` mount point using the desktop file manager.
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```
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$ ls -l /tmp/freedos
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total 216
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drwxr-xr-x. 5 root root 8192 May 10 15:53 APPS
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-rwxr-xr-x. 1 root root 85048 Apr 30 07:54 COMMAND.COM
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-rwxr-xr-x. 1 root root 103 May 13 15:48 CONFIG.SYS
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drwxr-xr-x. 5 root root 8192 May 15 16:52 DEVEL
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drwxr-xr-x. 2 root root 8192 May 15 13:36 EDLIN
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-rwxr-xr-x. 1 root root 1821 May 10 15:57 FDAUTO.BAT
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-rwxr-xr-x. 1 root root 740 May 13 15:47 FDCONFIG.SYS
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drwxr-xr-x. 10 root root 8192 May 10 15:49 FDOS
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-rwxr-xr-x. 1 root root 46685 Apr 30 07:54 KERNEL.SYS
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drwxr-xr-x. 2 root root 8192 May 10 15:57 SRC
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-rwxr-xr-x. 1 root root 3190 May 16 08:34 SRC.ZIP
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drwxr-xr-x. 3 root root 8192 May 11 18:33 TEMP
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```
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![GNOME file manager][4]
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Using GNOME file manager to access the virtual disk
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(Jim Hall, [CC-BY SA 4.0][5])
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For example, to copy several C source files from my Linux `projects` directory into `C:\SRC` on the virtual disk image, so I can use the files under FreeDOS later, I can use the Linux `cp` command:
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```
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`$ cp /home/jhall/projects/*.c /tmp/freedos/SRC`
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```
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The files and directories on the virtual drive are technically _case insensitive_, so you can refer to them using uppercase or lowercase letters. However, I find it more natural to type DOS files and directories using all uppercase.
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```
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$ ls /tmp/freedos
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APPS CONFIG.SYS EDLIN FDCONFIG.SYS KERNEL.SYS SRC.ZIP
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COMMAND.COM DEVEL FDAUTO.BAT FDOS SRC TEMP
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$ ls /tmp/freedos/EDLIN
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EDLIN.EXE MAKEFILE.OW
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$ ls /tmp/freedos/edlin
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EDLIN.EXE MAKEFILE.OW
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```
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### Unmounting with guestmount
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You should always _unmount_ the virtual disk image before you use it again in your virtual machine. If you leave the image mounted while you run QEMU or VirtualBox, you risk messing up your files.
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The companion command to `guestmount` is `guestunmount`, to unmount the disk image. Just give the mount point that you wish to unmount:
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```
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`$ guestunmount /tmp/freedos`
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```
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Note that this command is spelled slightly differently from the Linux `umount` system command.
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/21/6/copy-files-linux-freedos
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作者：[Jim Hall][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/jim-hall
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/files_documents_paper_folder.png?itok=eIJWac15 (Files in a folder)
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[2]: http://www.triusinc.com/forums/viewtopic.php?t=10
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[3]: https://libguestfs.org/
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[4]: https://opensource.com/sites/default/files/uploads/gnome-file-manager.png (Using GNOME file manager to access the virtual disk)
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[5]: https://creativecommons.org/licenses/by-sa/4.0/
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