Create: 2020-04-18 Update: 2025-07-06 05:09:02

DeepGit: HEAD

Забыл в последней статье упомянуть про HEAD.
В файле .git/HEAD лежит ссылка на рефернс.

 09:32:21 in tmp/git_/first on  master •99%
 ➜ cat .git/HEAD
 ref: refs/heads/master

С помощью команды

 git symbolic-ref HEAD refs/heads/<branch_name>

Можно ставить HEAD.

Теперь можно полностью понять как работает git checkout <branch> .

  cat .git/HEAD
  cat  <ref_path>
  git cat-file -p <commit_hash>
  git cat-file -p <tree_hash>

И дальше уже проходим по blob-ам, и записываем туда версии.

P.S Это весьма топорная реализация git checkout , на самом деле все работает немного иначе.
Впереди нас еще ждет статья про pack файлы и про то, как git оптимизирует хранение файлов.

Dev Tools

DeepGit: HEAD

Забыл в последней статье упомянуть про HEAD.
В файле .git/HEAD лежит ссылка на рефернс.

 09:32:21 in tmp/git_/first on  master •99%
 ➜ cat .git/HEAD
 ref: refs/heads/master

С помощью команды

 git symbolic-ref HEAD refs/heads/<branch_name>

Можно ставить HEAD.

Теперь можно полностью понять как работает git checkout <branch> .

  cat .git/HEAD
  cat  <ref_path>
  git cat-file -p <commit_hash>
  git cat-file -p <tree_hash>

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DeepGit: HEAD

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