git move directory to another repository while keeping the history -

first - apologies asking question. there lot of topics already. i'm not having luck them. lack of familiarity git not help.

i'm moving folder 1 git repo (which exists). e.g.

repo-1 ---- dir1 ---- dir2 ---- dir3 ---- dir-to-move ---- dir5  repo-2 ---- dir1 ---- dir2 ---- dir3 

in end want repos like

repo-1 ---- dir1 ---- dir2 ---- dir3 ---- dir-to-move ---- dir5  repo-2 ---- dir1 ---- dir2 ---- dir3 ---- dir-to-move 

i.e. time dir-to-move exist in both repos. i'll migrate latest changes repo-2 , remove dir-to-move repo-1.

my initial research made me believe needed use filter-branch. e.g.

how move files 1 git repo preserving history using `git format-patch`and `git am`

i've since learnt subtree superseded approach. it's not doing expected. thought i'd able like

in repo-1 workspace

git subtree split -p dir-to-move -b split 

to filter split branch down dir-to-move , it's history. in repo-2 workspace

git remote add repo-1 repo-1-url.git git subtree add --prefix dir-to-move split 

this move code across. also, sort of, includes history

e.g.

cd repo-2 git log 

shows commits repo-1

but

cd repo-2 git log dir-to-move 

shows 'add dir-to-move commit ....'

i.e. history included not show when checked specific files/directories.

how can properly?

i can't git subtree, filter-branch it's possible.

first need create common repository contain both source , destination branches. can done adding new "remote" beside "origin" , fetching new remote.

use filter-branch on source branch rm -rf directories except dir-to-move. after you'll have commit history can cleanly rebased or merged destination branch. think easiest way cherry-pick non-empty commits source branch. list of these commits can obtained running git rev-list --reverse source-branch -- dir-to-move

of course, if history of dir-to-move non-linear (already contains merge commits), won't preserved cherry-pick, git merge can used instead.

example create common repo:

cd repo-2 git remote add source ../repo-1 git fetch source 

example filter branch

cd repo-2 git checkout -b source-master source/master cmd="rm -rf dir1 dir2 dir3 dir5" git filter-branch --tree-filter "$cmd" 

example cherry-pick destination master

cd repo-2 git checkout master git cherry-pick `git rev-list --reverse source-master -- dir-to-move`