oh-my-git/levels/internals/index-add

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[description]
Blobs usually represent the content of a file. But on their own, they don't have any metadata, not even a name!
Git has a very powerful concept to store metadata related to blobs: the index! It's a list that relates blobs to filenames and access permissions.
The most convenient option to add an entry to the index is via an existing file:
echo "my content" > file
git update-index --add file
Add three entries to the index! For a bonus challenge: can you add a file that is inside of a directory, like "directory/file"?
[congrats]
There's another way to add an entry to the index directly:
git update-index --add --cacheinfo <mode>,<blobhash>,<name>
The first three numbers of the mode describe the type of the entry, "100" is a regular file.
The second three number describe the permissions. Only "644" (non-executable) and "755" (executable) are supported.
You can insert the hash of an object into the terminal by right-clicking on it! :)
[setup]
[setup goal]
echo "file 1" > file1
echo "file 2" > file2
echo "file 3" > file3
git add .
[win]
test "$(git ls-files | wc -l)" -ge 3