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I am installing new Linux distro (gentoo) and I want to copy the linux kernel config I have here in the linux mint live USB to the Gentoo system. The way Mint has the kernel config file is /boot/config-3.19.0-32-generic but in Gentoo it has to be /proc/config.gz (specific file path in this situation is /mnt/gentoo/proc/config.gz). Could I take the config-3.19.0.32-generic and turn it into config.gz and just copy? Is there other way to do this?

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    /proc is runtime-generated, so /proc/config.gz is always the config used to build the currently running kernel. Both /boot/config... and /proc/config.gz are used to have a config file to use when you want to compile the Linux kernel (which you should do for Gentoo). – cylgalad Dec 27 '15 at 9:59
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    Why do you want to do this? – Gilles 'SO- stop being evil' Dec 27 '15 at 17:43
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.gz is a gzip format, read this: https://en.wikipedia.org/wiki/Gzip

You can compress the file and then move it.

gzip /boot/config-3.19.0-32-generic
mv /boot/config-3.19.0-32-generic.gz /mnt/gentoo/proc/config.gz
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  • That should be probably ... /mnt/gentoo/proc/config.gz as copying to live /proc filesystem might not work as intended. – zagrimsan Dec 27 '15 at 9:15
  • @zagrimsan yes, updated – roxto Dec 27 '15 at 9:21
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Do the Following

  1. On a Windows Machine, use LiLiCreator to create a USB, containing the Gentoo LiveCD.
  2. Boot your Mint Version.
  3. Mount the Gentoo Live USB in Mint. I'll assume sdb.
  4. Issue roxto's command, gzip /boot/config-version && mv /boot/config-version.gz /dev/sdb
  5. Boot the Gentoo Live USB.
  6. Follow the Gentoo Handbook Step by Step to Configuring the Linux kernel
  7. During the Preparing the Disks step, you need to issue: cp /config-version.gz /mnt/gentoo/boot
  8. You must now match Kernel Versions. To do that, read the post I helped answer on Masked Kernel Versions.
  9. Note that you WILL HAVE ISSUES, as our Package Maintainers don't have a 3.19.x Kernel Version. See the Gentoo Sources Package. Knowing this you need install a Matching version in Mint before you do this procedure, using the Update Manager in Mint. See Question 3 here.
  10. Rename your File in step 4 to .config and move it to /usr/src/linux and then follow the manual configuration option in the handbook.
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