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combine multiple git repositories into one

The purpose is to combine multiple Git repositories into one without losing the history information. From here(MiniQuark’s answer).

Imagine we have the following projects each one is a Git repository:

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drwxrwxr-x 7 gang gang 4.0K 11月 28 15:13 AGS_APIMgr
drwxrwxr-x 5 gang gang 4.0K 11月 28 15:13 AGS_Gateway
drwxrwxr-x 5 gang gang 4.0K 11月 28 15:13 AGS_IPAAS_Admin
drwxrwxr-x 5 gang gang 4.0K 11月 28 15:14 AGS_ISPDev
drwxrwxr-x 2 gang gang 4.0K 11月 28 15:06 AGS_ISPOwner
drwxrwxr-x 2 gang gang 4.0K 11月 28 15:06 AGS_ISVDoc
drwxrwxr-x 4 gang gang 4.0K 11月 28 15:19 AGS_model
drwxrwxr-x 6 gang gang 4.0K 11月 28 15:14 AGS_OAuth

First, run the following commands inside each sub project directory(remember to change the project directory name in each running):

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$ cd /root/AGS_APIMgr
$ git filter-branch --index-filter \
    'git ls-files -s | sed "s-\t-&AGS_APIMgr/-" |
     GIT_INDEX_FILE=$GIT_INDEX_FILE.new \
     git update-index --index-info &&
     mv $GIT_INDEX_FILE.new $GIT_INDEX_FILE' HEAD

Second, run the following commands to create new Git repository, add content and remove original content:

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cd root
git init
# Run the following commands for each sub project directory you're working on:
git pull AGS_APIMgr
rm -rf AGS_APIMgr/AGS_APIMgr
rm -rf AGS_APIMgr/.git

Done.

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