binding error while merging many git repository into one preserving their histories

Question

I am trying to merge two git repository into single one and I have followed following tutorial http://jasonkarns.com/blog/merge-two-git-repositories-into-one/ . I am successfully able to merge the repository with master branch, but when I am merging two repo with (master and develop) branch and when I am running command

git read-tree --prefix=<project-name>/ -u <project-name>/develop

$git read-tree --prefix=first/ -u first/develop
error: Entry 'first/first' overlaps with 'first/first'.  Cannot bind.

I have executed command in following pattern,

# merge project A into subdirectory A [for master branch]
 git remote add -f first ../first
 git merge -s ours --no-commit first/master
 git read-tree --prefix=first/ -u first/master
 git commit -am "merging projectA master branch into subdirectory A"

# for develop branch
  git checkout -b develop
  git merge -s ours --no-commit first/develop
  git read-tree --prefix=first/ -u first/develop
  git commit -am "merging prjectA development branch into subdirectory A"

I am not sure whether I should run read-tree for development branch or not.

Answer 1

I've seen the problem that you've described in the past, the error is pretty reoccuring.

git read-tree --prefix=path -u project
error: Entry 'path/file' overlaps with 'path/file'.  Cannot bind.

In related questions they suggest to use the read-tree function to solve this.

I'd suggest you to look at How do I add/upgrade/downgrade a remote Git project in my repository without using submodules? which might help you out.

Best of luck

-Ricardo