[Tutor] Run a few Python commands from a temporary filesystem when the rootfs is halted
With Bash, when one needs to halt the current root filesystem, to pivot to a new filesystem, one can copy some of the command files and their dependencies to a temporary file system and execute from that code base. Is there a way to accomplish the same within a Python script? Or must I chain Python and Bash together for this? --Fred ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Run a few Python commands from a temporary filesystem when the rootfs is halted
On 22-Apr-11 16:54, Frederick Grose wrote: With Bash, when one needs to halt the current root filesystem, to pivot to a new filesystem, one can copy some of the command files and their dependencies to a temporary file system and execute from that code base. I'm not sure those words mean what you think they mean, or I'm missing what you're trying to do here. halting the root filesystem? pivot? code base? You're not trying to talk about jail/chroot, perhaps? -- Steve Willoughby / st...@alchemy.com A ship in harbor is safe, but that is not what ships are built for. PGP Fingerprint 4615 3CCE 0F29 AE6C 8FF4 CA01 73FE 997A 765D 696C ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Run a few Python commands from a temporary filesystem when the rootfs is halted
On Fri, Apr 22, 2011 at 7:59 PM, Steve Willoughby st...@alchemy.com wrote: On 22-Apr-11 16:54, Frederick Grose wrote: With Bash, when one needs to halt the current root filesystem, to pivot to a new filesystem, one can copy some of the command files and their dependencies to a temporary file system and execute from that code base. I'm not sure those words mean what you think they mean, or I'm missing what you're trying to do here. halting the root filesystem? pivot? code base? You're not trying to talk about jail/chroot, perhaps? -- Steve Willoughby / st...@alchemy.com The particulars are that I've rebuilt a Fedora LiveOS filesystem image from a currently running instance (incorporating the filesystem changes in the device-mapper overlay into a new base filesystem image file). I'd like to halt the active rootfs, switch to its mirror, copy over the halted filesystem image file with the refreshed version, and then switch back. --Fred ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Run a few Python commands from a temporary filesystem when the rootfs is halted
Frederick Grose wrote: With Bash, when one needs to halt the current root filesystem, to pivot to a new filesystem, one can copy some of the command files and their dependencies to a temporary file system and execute from that code base. Is there a way to accomplish the same within a Python script? This is way off-topic for a Python tutor list. This is about learning the Python programming language, not the intricate corners of (I assume) Linux system administration. I would imagine that it would be very, very difficult in Python, because you would need somehow to end the *current* Python process and start up a *new* Python process running from executables on the new file system, without manual intervention. I strongly suggest you take this question to the main Python list, pyt...@python.org, which is also available as a news group comp.lang.python, and show the bash code you are trying to duplicate. There's no guarantee you'll get an answer there either, but it's more likely than here. Good luck! -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Run a few Python commands from a temporary filesystem when the rootfs is halted
On 22-Apr-11 17:14, Frederick Grose wrote: The particulars are that I've rebuilt a Fedora LiveOS filesystem image from a currently running instance (incorporating the filesystem changes in the device-mapper overlay into a new base filesystem image file). Right, so essentially you're talking about chrooting into the LiveOS image temporarily. It's not really halting as such, just where the OS's idea of root is at the moment. That involves mounting your LiveOS filesystem as well. The short answer is that if you can do it in the shell, you can do it in Python, but there's got to be more to the story than just this. What are you trying to actually do that you need Python for this? I assume you're trying to automate the process of what you're doing? Almost probably this is possible with Python, if I understand what you're doing. If you just want to know how to write a Python script around the steps you want to accomplish, as a simple beginning Python experience, we may still be of service to you. We could, for example point you to read up on the os.chroot() function in the Python standard library. If your question has more to do with the particulars of managing chroot()ed mountpoints or preparing LiveOS images, you'd need to look to a forum devoted to that. -- Steve Willoughby / st...@alchemy.com A ship in harbor is safe, but that is not what ships are built for. PGP Fingerprint 4615 3CCE 0F29 AE6C 8FF4 CA01 73FE 997A 765D 696C ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Run a few Python commands from a temporary filesystem when the rootfs is halted
On Fri, Apr 22, 2011 at 8:55 PM, Steve Willoughby st...@alchemy.com wrote: On 22-Apr-11 17:14, Frederick Grose wrote: The particulars are that I've rebuilt a Fedora LiveOS filesystem image from a currently running instance (incorporating the filesystem changes in the device-mapper overlay into a new base filesystem image file). Right, so essentially you're talking about chrooting into the LiveOS image temporarily. It's not really halting as such, just where the OS's idea of root is at the moment. That involves mounting your LiveOS filesystem as well. The short answer is that if you can do it in the shell, you can do it in Python, but there's got to be more to the story than just this. What are you trying to actually do that you need Python for this? I assume you're trying to automate the process of what you're doing? Almost probably this is possible with Python, if I understand what you're doing. If you just want to know how to write a Python script around the steps you want to accomplish, as a simple beginning Python experience, we may still be of service to you. We could, for example point you to read up on the os.chroot() function in the Python standard library. If your question has more to do with the particulars of managing chroot()ed mountpoints or preparing LiveOS images, you'd need to look to a forum devoted to that. -- Steve Willoughby / st...@alchemy.com Thank you Steve and Steven for your assistance! I misread this sentence in the list description, While the list is called tutor, anyone, whether novice or expert, can answer questions. .. to include 'ask' as well as answer questions that may be instructive. I've posted in Python-list, as suggested. Steven's synopsis, ... you would need somehow to end the *current* Python process and start up a *new* Python process running from executables on the new file system, without manual intervention. is the situation I'm attempting. I have written the LiveOS rebuilding code in Python, and am working to complete the operation in Python, if possible, but don't know enough about how the Python shutdown and startup might be scripted within Python. --Fred ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Run a few Python commands from a temporary filesystem when the rootfs is halted
Frederick Grose wrote: I misread this sentence in the list description, While the list is called tutor, anyone, whether novice or expert, can answer questions. .. to include 'ask' as well as answer questions that may be instructive. Well, you can *ask*, but the number of people on this list is much smaller than the main python list, and we tend to be focused more on beginner questions and learning the language rather than the more advanced stuff. So it's more about maximising your chances of getting a good answer. -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
