Ensures you don't commit/push with the wrong git identity

pre-commit-push.sh

#!/bin/bash
# This script ensures you don't commit/push with the wrong git identity. My remotes are like this: gitperso:iTrooz/repo.git, gitschool:SomeUser/repo.git
# This script should be installed as both pre-commit and pre-push hook (symlink it)
# To use it as a global hook, see https://gist.github.com/iTrooz/551f779af2096912baa9d2e395e2642a

verify_author() {
    local author="$1"
    local url="$2"

    case "$url" in
        gitperso*)
            if [[ "$author" != "iTrooz" ]]; then
                echo "❌ Wrong author: '$author' (expected iTrooz)."
                exit 1
            fi
            ;;
        gitschool*)
            if [[ "$author" != *SomeUser* ]]; then
                echo "❌ Wrong author: '$author' (must contain 'SomeUser')."
                exit 1
            fi
            ;;
        *)
            echo "⚠️  Unsupported origin '$url'. Skipping checks."
            ;;
    esac
}


url=$(git config --get remote.origin.url)

if [[ "$0" == *pre-commit ]]; then
    current_user=$(git config user.name)
    echo "Checking local git user: $current_user"
    verify_author "$current_user" "$url"
elif [[ "$0" == *pre-push ]]; then
    while read local_ref local_sha remote_ref remote_sha; do
        if [[ "$remote_sha" == 0000000000000000000000000000000000000000 ]]; then
            range="$local_sha"
        else
            range="$remote_sha..$local_sha"
        fi
        [ -z "$range" ] && continue
        while read -r commit; do
            author_name=$(git show -s --format='%an' "$commit")
            verify_author "$author_name" "$url"
        done < <(git rev-list "$range")
    done
fi

# If used as a global hook, call the local hook if it exists
# See https://gist.github.com/iTrooz/551f779af2096912baa9d2e395e2642a
LOCAL_HOOK=$(realpath ./.git/hooks/$(basename "$0"))
if [ -x "$LOCAL_HOOK" ] && [ "$LOCAL_HOOK" != "$(realpath $0)" ]; then
"$LOCAL_HOOK" "$@"
fi