適当にブランチを作成・マージした履歴を持つGitリポジトリを作成するシェルスクリプト

$mkdir-p ~/projects/git-test &&cd ~/projects/git-test
$bash ~/create_git_sample.sh 20
#1: grow branch_1
#2: grow branch_2
#3: grow branch_3
#4: grow branch_1
#5: grow branch_5
#6: merge branch_5
#7: grow branch_2
#8: grow branch_8
#9: grow branch_3
#10: grow branch_10
#11: merge branch_1
#12: grow branch_3
#13: grow branch_2
#14: merge branch_3
#15: grow branch_10
#16: grow branch_16
#17: merge branch_16
#18: grow branch_10
#19: grow branch_8
#20: grow branch_20
$git branch
  branch_10
  branch_2
* branch_20
  branch_8
  master

$git log --all--graph--pretty='format:%h  %s%d'# 結果は以下

* 31d637a  commit #20 (HEAD -> branch_20)
*   f2aa4aa  commit #17 (master)
|\
| * a657015  commit #16
|/
*   aba2761  commit #14
|\
| * 2ee59c2  commit #12
| * 41636ee  commit #9
| * 4331a92  commit #3
| | * 067ef23  commit #18 (branch_10)
| | * 6183b74  commit #15
| | * 7623eea  commit #10
| |/
|/|
* |   c571fd8  commit #6
|\ \
| |/
|/|
| * 410deba  commit #5
| * 85f8ad8  commit #4
| * aed22a4  commit #1
|/
| * f0b9948  commit #19 (branch_8)
| * ab171f9  commit #8
| | * 8eb7aa6  commit #13 (branch_2)
| |/
| * e4fdf2d  commit #7
| * 86f5b66  commit #2
|/
* e06942b  commit #0

rm-rf* .gitignore .git/

#!/bin/bashset-eufunction setup_git_repository(){
    git init
    git config --local user.email "xxx@example.com"
    git config --local user.name  "xxx"cat<<EOF> .gitignore
!*.txt
!.gitignore
EOF
    git add .
    git commit -m"commit #0"}function show_branch_name(){
    git symbolic-ref --short HEAD
}function pick_branch_name(){
    git for-each-ref--format='%(refname:short)''refs/heads/*' | shuf-n1}function grow_branch(){current_branch="$(show_branch_name)"target_branch="$(pick_branch_name)"if[-z"${target_branch}"\-o"${target_branch}"="master"\-o"${target_branch}"="${current_branch}"];then
        target_branch="branch_${i}"
        git branch "${target_branch}""$(shuf-e-n1--'HEAD''master')"fi
    git checkout "${target_branch}" 2> /dev/null

    git log --oneline>"${target_branch}.txt"
    git add .
    git commit -m"commit #${1}"echo"#${1}: grow ${target_branch}" 1>&2
}function merge_branch(){target_branch="$(pick_branch_name)"if[-z"${target_branch}"];then return 1;fi
    if["${target_branch}"="master"];then return 2;fi

    git checkout master 2> /dev/null
    git merge --no-ff-X"theirs"-m"commit #${1}"--"${target_branch}"
    git branch -d"${target_branch}"echo"#${1}: merge ${target_branch}" 1>&2
}#--- main ---#if[-d".git"];then
    echo"repository already exists." 2> /dev/null
    exit 1
fi

setup_git_repository > /dev/null

for i in$(seq"${1}");do
    case"$(shuf-e-n1--'grow''grow''merge')"in"grow") grow_branch "${i}";;"merge") merge_branch "${i}"|| grow_branch "${i}";;esacdone> /dev/null