Friday, June 25, 2021

How to cherry pick on a commit but only a few files from upstream patch

I forked a repository from upstream and there was a patch I like and I would like that patch goes into my forked repository. But at the same time, I would like to pick only a few changes, that is, not the whole commit and at the same time too, I need to make some minor modifications. So here goes how this is done.

Let's check where we are at now.

 jason@localhost:~/advanced-policy-firewall$ git branch  
 * master  

Get the commit id from roberto patch, cherry pick the whole commit but do not commit yet.. just stage at the current branch (which is master)

 jason@localhost:~/advanced-policy-firewall$ git cherry-pick -n 0d1df6549820f9592aefb2353b77c52eadbe759f  
 Auto-merging files/vnet/vnetgen  
 CONFLICT (content): Merge conflict in files/vnet/vnetgen  
 error: could not apply 0d1df65... - fixed vnetgen for newer linux distros to prioritize ip over ipconfig  
 hint: after resolving the conflicts, mark the corrected paths  
 hint: with 'git add <paths>' or 'git rm <paths>'  
 jason@localhost:~/advanced-policy-firewall$ git status .  
 On branch master  
 Your branch is up to date with 'origin/master'.  
 Changes to be committed:  
  (use "git restore --staged <file>..." to unstage)  
      modified:  README  
      new file:  test/distros_examples/ifconfig_ubuntu_12  
      new file:  test/distros_examples/ifconfig_ubuntu_20  
      new file:  test/distros_examples/ip_addr_ubuntu_12  
      new file:  test/distros_examples/ip_addr_ubuntu_20  
      new file:  test/distros_examples/ip_link_ubuntu_12  
      new file:  test/distros_examples/ip_link_ubuntu_20  
 Unmerged paths:  
  (use "git restore --staged <file>..." to unstage)  
  (use "git add <file>..." to mark resolution)  
      both modified:  files/vnet/vnetgen  

Let's get the diff of the stage file

 jason@localhost:~/advanced-policy-firewall$ git diff --cached README  
 diff --git a/README b/README  
 index 07ad004..0adf39d 100644  
 --- a/README  
 +++ b/README  
 @@ -199,7 +199,7 @@ Fedora Core Any  
  Slackware 8.0+  
  Debian GNU/Linux 3.0+  
  Suse Linux 8.1+  
 -Unbuntu Any  
 +Ubuntu Any  
  TurboLinux Server 9+  
  TurboLinux Fuji (Desktop)  
  RedHat Linux 7.3,8,9  

Unstage a file because I wanna make minor modification. After changes are make, add it back to the stage

 $ git restore --staged test/distros_examples/ip_link_ubuntu_12  
 $ vim test/distros_examples/ip_link_ubuntu_12  
 $ git add test/distros_examples/ip_link_ubuntu_12  

All good now, let's commit

 $ git commit -m "cherry pick but only selected files from roberto patched"  
 [master 80830c9] cherry pick but only selected files from roberto patched  
  8 files changed, 330 insertions(+), 28 deletions(-)  
  create mode 100644 test/distros_examples/ifconfig_ubuntu_12  
  create mode 100644 test/distros_examples/ifconfig_ubuntu_20  
  create mode 100644 test/distros_examples/ip_addr_ubuntu_12  
  create mode 100644 test/distros_examples/ip_addr_ubuntu_20  
  create mode 100644 test/distros_examples/ip_link_ubuntu_12  
  create mode 100644 test/distros_examples/ip_link_ubuntu_20  
 $ git branch  
 * master  

and we push the changes to github

 $ git push  
 Enumerating objects: 19, done.  
 Counting objects: 100% (19/19), done.  
 Delta compression using up to 16 threads  
 Compressing objects: 100% (13/13), done.  
 Writing objects: 100% (14/14), 3.68 KiB | 3.68 MiB/s, done.  
 Total 14 (delta 7), reused 0 (delta 0), pack-reused 0  
 remote: Resolving deltas: 100% (7/7), completed with 4 local objects.  
   f98e9bb..80830c9 master -> master  

in case you want to see the final result, please visit this github commit.

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