Create: 2020-03-22 Update: 2025-07-02 04:01:06

DeepGit: Hashing and Cating. Понимаем файловую систему.

Ч1

Как я говорил ранее, Git это файловая система основой которой являются файлы типа tree, commit, blob.
Подробнее о типах файлов у меня вышла статья на DevQuiz.
Рекомендую прочесть ее и вернуться сюда.

Для того чтобы git начал мониторить ваши файлы ему нужно получить blob файл с этим данными.
Если вы после создания репозитория посмотрите в папку objects она будет пуста, даже если в директории с гитом уже есть файлы.

Чтобы добавить файл в git есть техническая команда git hash-object -w filename.txt она делает blob файл с вашими данными и сохраняет себе в objects.

После этого git status все еще будет пуст, так как индекса еще нет, но git уже сохранил себе версию этого файла.
Именно эта команда лежит в основе гита, это такой себе "save" ваших данных.

Например вы сделали

 echo "first version" >  new_file.txt
 git hash-object -w new_file.txt

У вас появляется файл new_file.txt с текстом first version и появляется файл de8d69c9026be2a49f540fda12f3e755a33e6c в папке 22 с таким же текстом.

Следом мы делаем

 echo "second version" > new_file.txt
 git hash-object -w new_file.txt

У нас появляется доп файл 7ac37bb280ccd34b350a59ba440614d9106e41 в папке ad с текстом

second version

Теперь с помощью git cat-file -p 22de8d69c9026be2a49f540fda12f3e755a33e6c > new_file.txt можно переключиться на старую версию.

И все это происходит до того как вы сделали git add.
Все еще с пустым индексом.

Dev Tools

 echo "first version" >  new_file.txt
 git hash-object -w new_file.txt

 echo "second version" > new_file.txt
 git hash-object -w new_file.txt

У нас появляется доп файл 7ac37bb280ccd34b350a59ba440614d9106e41 в папке ad с текстом

second version

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DeepGit: Hashing and Cating. Понимаем файловую систему.

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​​DeepGit: Hashing and Cating. Понимаем файловую систему.