Add note to commit when filtering branch with Git

Question

Next command is to store commit history and files lists but remove file contents in order to minimalize disk space and network traffic consumption when need to get know history of huge repo without fetching large objects. This allows to save much time.

git filter-branch -f -d `mktemp -d` \
   --tree-filter '
      find . -type f -not -path ./.git\* |
         while read file; do > "$file"; done
   ' \
   --msg-filter '
      cat - && echo && echo "commit $GIT_COMMIT"
   ' \
   -- metainfo/$BRANCH

I also need to know the source commit hash. It is appended to commit message as you can see in --msg-filter part.

I would like to store source commit hash in git notes.

Is it possible? How?

Aside: you don't need `-not -path ./.git\*` as `--tree-filter` is run in a temporary directory that contains no `.git` directory — torek, Nov 07 '18 at 21:00
this is not only for .git directory but mostly for .gitignore and .gitattributes — kyb, Nov 07 '18 at 21:27
Ah, that makes sense, but then you probably should use `-not -name .gitignore -not -name .gitattributes` since such files can occur at any subdirectory. — torek, Nov 07 '18 at 21:53
and gitmodules and something else ... I prefer pattern, why not? — kyb, Nov 07 '18 at 22:14
Well, `.gitmodules` should only occur at the top level, so there `-path` makes sense. The problem with `-path ./.git\*` is that it *won't* recognize `subdir/.gitignore`, for instance, because that isn't path `./.git*`, but rather path `./subdir/.git*`. — torek, Nov 07 '18 at 22:30

kyb · Accepted Answer · 2018-11-09T12:27:21.083

0

Simple solution: do not change commit message, but create file.

git filter-branch -f -d `mktemp -d` \
   --tree-filter '
      find . -type f -not -path ./\*/.git\* |
         while read file; do > "$file"; done
      echo "$GIT_COMMIT" >.GIT_COMMIT
   ' \
   -- metainfo/$BRANCH

edited Nov 09 '18 at 12:27

answered Nov 09 '18 at 11:19

kyb

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Add note to commit when filtering branch with Git

I would like to store source commit hash in git notes.

1 Answers1