以下是我的bash脚本基于肯特的回答与改进:

it checks out the original branch, not just master, when done; I tried to avoid the temporary branch, but git checkout --orphan only works with a branch, not detached-head state, so it's checked out long enough to make the new root commit and then deleted; it uses the hash of the new root commit during the filter-branch (Kent left a placeholder in there for manual replacement); the filter-branch operation rewrites only the local branches, not remotes too the author and committer metadata is standardised so that the root commit is identical across repositories.

#!/bin/bash

# Save the current branch so we can check it out again later
INITIAL_BRANCH=`git symbolic-ref --short HEAD`
TEMP_BRANCH='newroot'

# Create a new temporary branch at a new root, and remove everything from the tree
git checkout --orphan "$TEMP_BRANCH"
git rm -rf .

# Commit this empty state with generic metadata that will not change - this should result in the same commit hash every time
export GIT_AUTHOR_NAME='nobody'
export GIT_AUTHOR_EMAIL='nobody@example.org'
export GIT_AUTHOR_DATE='2000-01-01T00:00:00+0000'
export GIT_COMMITTER_NAME="$GIT_AUTHOR_NAME"
export GIT_COMMITTER_EMAIL="$GIT_AUTHOR_EMAIL"
export GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"
git commit --allow-empty -m 'empty root'
NEWROOT=`git rev-parse HEAD`

# Check out the commit we just made and delete the temporary branch
git checkout --detach "$NEWROOT"
git branch -D "$TEMP_BRANCH"

# Rewrite all the local branches to insert the new root commit, delete the 
# original/* branches left behind, and check out the rewritten initial branch
git filter-branch --parent-filter "sed \"s/^\$/-p $NEWROOT/\"" --tag-name-filter cat -- --branches
git for-each-ref --format="%(refname)" refs/original/ | xargs -n 1 git update-ref -d
git checkout "$INITIAL_BRANCH"

好吧，这是我想到的:

# Just setting variables on top for clarity.
# Set this to the path to your original repository.
ORIGINAL_REPO=/path/to/original/repository

# Create a new repository…
mkdir fun
cd fun
git init
# …and add an initial empty commit to it
git commit --allow-empty -m "The first evil."

# Add the original repository as a remote
git remote add previous $ORIGINAL_REPO
git fetch previous

# Get the hash for the first commit in the original repository
FIRST=`git log previous/master --pretty=format:%H  --reverse | head -1`
# Cherry-pick it
git cherry-pick $FIRST
# Then rebase the remainder of the original branch on top of the newly 
# cherry-picked, previously first commit, which is happily the second 
# on this branch, right after the empty one.
git rebase --onto master master previous/master

# rebase --onto leaves your head detached, I don't really know why)
# So now you overwrite your master branch with the newly rebased tree.
# You're now kinda done.
git branch -f master
git checkout master
# But do clean up: remove the remote, you don't need it anymore
git remote rm previous

如果你忘记在"git init"之后立即创建一个空提交，那么在存储库的开始添加一个空提交:

git rebase --root --onto $(git commit-tree -m 'Initial commit (empty)' 4b825dc642cb6eb9a060e54bf8d69288fbee4904)

我很兴奋，写了一个“幂等”版本的这个不错的脚本…它总是插入相同的空提交，如果你运行它两次，它不会每次都改变你的提交哈希值。所以，这是我对git-insert-empty-root的看法:

#!/bin/sh -ev
# idempotence achieved!
tmp_branch=__tmp_empty_root
git symbolic-ref HEAD refs/heads/$tmp_branch
git rm --cached -r . || true
git clean -f -d
touch -d '1970-01-01 UTC' .
GIT_COMMITTER_DATE='1970-01-01T00:00:00 +0000' git commit \
  --date='1970-01-01T00:00:00 +0000' --allow-empty -m 'initial'
git rebase --committer-date-is-author-date --onto $tmp_branch --root master
git branch -d $tmp_branch

它值得额外的复杂性吗?也许不是，但我会用这个。

这也应该允许在几个克隆的repo副本上执行这个操作，并最终得到相同的结果，因此它们仍然是兼容的…测试……是的，它可以工作，但也需要删除和添加你的遥控器，例如:

git remote rm origin
git remote add --track master user@host:path/to/repo

合并亚里士多德Pagaltzis和Uwe Kleine-König的答案和理查德布罗诺斯基的评论。

git symbolic-ref HEAD refs/heads/newroot
git rm --cached -r .
git clean -f -d
# touch .gitignore && git add .gitignore # if necessary
git commit --allow-empty -m 'initial'
git rebase --onto newroot --root master
git branch -d newroot

(只是为了把所有的东西放在一个地方)

遵循亚里士多德和其他人的回答，但使用更简单的命令

zsh% git checkout --orphan empty     
Switched to a new branch 'empty'
zsh% git rm --cached -r .
zsh% git clean -fdx
zsh% git commit --allow-empty -m 'initial empty commit'
[empty (root-commit) 64ea894] initial empty commit
zsh% git checkout master
Switched to branch 'master'
zsh% git rebase empty
First, rewinding head to replay your work on top of it...
zsh% git branch -d empty 
Deleted branch empty (was 64ea894).

请注意，您的回购不应该包含任何等待提交的本地修改。 注意git检出——孤儿将在新版本的git中工作，我猜。 注意，大多数时候git状态给出了有用的提示。