svn meld on nixos

21 may 2012

this has been discussed on many blogs but since i had this issue twice now and especially since svn changed the parameter list and therefore many pages describing this are thus wrong, here it is again. also nobody seems to implement the workflow i like, that is:

  • on the left side is the file to be edited
  • on the right side is the new version (this file is only important while merging)

workflow: what ~/.meld does is to give you MINE and THEIRS for merging into MINE (MINE is the left side document). after the merge it would copy the modified MINE over MERGED. and once the conflict is marked ‘resolved’ all the different files will vanish and leave a working set of files.


merge-tool-cmd = /root/.meld


### the specified command: base theirs mine merged wcfile
/nix/var/nix/profiles/default/bin/meld $3 $2
# this cp copies mine to merged
cp $3 $4
exit 0

afterwards don’t forget to make it executable & install meld of course:

chmod u+x .meld
nix-env -i meld

the merge:

svn up
Updating '.':
A pkgs/applications/misc/gnome_terminator
A pkgs/applications/misc/gnome_terminator/default.nix
U pkgs/applications/version-management/git-and-tools/svn2git-kde/default.nix
A pkgs/applications/graphics/zgrviewer
A pkgs/applications/graphics/zgrviewer/default.nix
U pkgs/applications/audio/audacious/default.nix
U pkgs/applications/audio/yoshimi/default.nix
U pkgs/lib/platforms.nix
G pkgs/top-level/all-packages.nix
U pkgs/top-level/haskell-defaults.nix

Conflict discovered in '/etc/nixos/nixpkgs/pkgs/top-level/python-packages.nix'.
Select: (p) postpone, (df) diff-full, (e) edit,
 (mc) mine-conflict, (tc) theirs-conflict,
 (s) show all options: <strong>l</strong>
  1. type ‘l’ (like linux) on the keyboard

  2. on the left side is the file you want to patch, so make changes to the left side and save the document

  3. now close meld

  4. back on the shell, type ‘r’ (for resolved)

  5. continue with other conflicts

article source