Git - Staging

case $(pwd) in
,*git_lab_1*)
    cd ..
    rm -rf git_lab_1
    mkdir git_lab_1
    cd git_lab_1
    pwd
    ls -al
    ;;
,*)
    echo "You're in a wrong directory pal: $(pwd)."
    ;;
esac

/Users/allarm/Tmp/git_lab_1
total 0
drwxr-xr-x   2 allarm  staff   64 Nov 10 18:11 .
drwxr-xr-x  24 allarm  staff  768 Nov 10 18:11 ..

echo "Hello world!" > hello.txt
echo "Goodbye world :(" > goodbye.txt
mkdir awesome_dir
echo "I am awesome!" > awesome_dir/awesome.txt
git init
git config user.name "Andrey Che"
git config user.email "andrey@che.org"
git add .
#git commit -m "First commit"

Initialized empty Git repository in /Users/allarm/Tmp/git_lab_1/.git/

Currently, we added a couple of file to staging (or index). Nothing has been commited yet.

Let's check the file tree.

tree .git -I *sample

.git
|-- HEAD
|-- config
|-- description
|-- hooks
|-- index
|-- info
|   `-- exclude
|-- objects
|   |-- 11
|   |   `-- dd309e25ce41320f8b55ef3be7d50246a8b4a6
|   |-- c1
|   |   `-- 2fddafdaba3b7b1281f50c9e482ed673f1767c
|   |-- cd
|   |   `-- 0875583aabe89ee197ea133980a9085d08e497
|   |-- info
|   `-- pack
`-- refs
    |-- heads
    `-- tags

11 directories, 8 files

The refs dir is empty.

Now let's get the file objects:

objects=$(find .git/objects -type f | awk -F"/" '{print $3$4}')
for o in $objects
do
  echo "$o : $(git cat-file -t $o)"
done

c12fddafdaba3b7b1281f50c9e482ed673f1767c : blob
11dd309e25ce41320f8b55ef3be7d50246a8b4a6 : blob
cd0875583aabe89ee197ea133980a9085d08e497 : blob

Let's check what would change after the commit.

git commit -m "First commit"
tree .git -I *sample

[master (root-commit) 55c2ff5] First commit
 3 files changed, 3 insertions(+)
 create mode 100644 awesome_dir/awesome.txt
 create mode 100644 goodbye.txt
 create mode 100644 hello.txt
.git
|-- COMMIT_EDITMSG
|-- HEAD
|-- config
|-- description
|-- hooks
|-- index
|-- info
|   `-- exclude
|-- logs
|   |-- HEAD
|   `-- refs
|       `-- heads
|           `-- master
|-- objects
|   |-- 11
|   |   `-- dd309e25ce41320f8b55ef3be7d50246a8b4a6
|   |-- 27
|   |   `-- c68820a14130e9866371d6cb746ca5cbd39864
|   |-- 55
|   |   `-- c2ff56b2d2c3b08c3e5680280a84a69a83a7d9
|   |-- c1
|   |   `-- 2fddafdaba3b7b1281f50c9e482ed673f1767c
|   |-- cd
|   |   `-- 0875583aabe89ee197ea133980a9085d08e497
|   |-- ed
|   |   `-- 557584085e6ecbc79a01adb943fdba7a05f5f0
|   |-- info
|   `-- pack
`-- refs
    |-- heads
    |   `-- master
    `-- tags

17 directories, 15 files

objects=$(find .git/objects -type f | awk -F"/" '{print $3$4}')
for o in $objects
do
  echo "$o : $(git cat-file -t $o)"
done

ed557584085e6ecbc79a01adb943fdba7a05f5f0 : tree
c12fddafdaba3b7b1281f50c9e482ed673f1767c : blob
27c68820a14130e9866371d6cb746ca5cbd39864 : tree
11dd309e25ce41320f8b55ef3be7d50246a8b4a6 : blob
55c2ff56b2d2c3b08c3e5680280a84a69a83a7d9 : commit
cd0875583aabe89ee197ea133980a9085d08e497 : blob

3 blobs that had been there before the commit remain unchanged. There are 2 new tree objects. One is a pointer to the files in a root directory (and to the awesome_dir sitting inside this directory) and another one points to the files in awesome_dir:

objects=$(find .git/objects -type f | awk -F"/" '{print $3$4}')
for o in $objects
do
  type=$(git cat-file -t $o)
  if [ $type == "tree" ]
  then
    echo "[ $o : $type ]"
    echo
    git cat-file -p $o
    echo
  fi
done

[ ed557584085e6ecbc79a01adb943fdba7a05f5f0 : tree ]

100644 blob 11dd309e25ce41320f8b55ef3be7d50246a8b4a6	awesome.txt

[ 27c68820a14130e9866371d6cb746ca5cbd39864 : tree ]

040000 tree ed557584085e6ecbc79a01adb943fdba7a05f5f0	awesome_dir
100644 blob c12fddafdaba3b7b1281f50c9e482ed673f1767c	goodbye.txt
100644 blob cd0875583aabe89ee197ea133980a9085d08e497	hello.txt

There's also a new commit object referencing the root tree (27c6):

objects=$(find .git/objects -type f | awk -F"/" '{print $3$4}')
for o in $objects
do
  type=$(git cat-file -t $o)
  if [ $type == "commit" ]
  then
    echo "[ $o : $type ]"
    echo
    git cat-file -p $o
    echo
  fi
done

[ 55c2ff56b2d2c3b08c3e5680280a84a69a83a7d9 : commit ]

tree 27c68820a14130e9866371d6cb746ca5cbd39864
author Andrey Che <andrey@che.org> 1605003146 +0800
committer Andrey Che <andrey@che.org> 1605003146 +0800

First commit