git-test-once

#!/bin/sh
# Run a command over a sequence of commits.
# Example:
#  git test-once 'make clean && make compile && make test'

. "$(git --exec-path)/git-sh-setup"
require_work_tree

get_hash_input() {
    echo "$1"
    git rev-parse 'HEAD^{tree}'
    git diff HEAD
}

already_passed() {
    h=`get_hash_input "$1" | git hash-object --stdin`
    git cat-file blob $h > /dev/null 2>/dev/null && echo "Already passed $h"
}

passed_on() {
    h=`get_hash_input "$1" | git hash-object -w --stdin`
    echo "Passed: $h."
}

echo "Testing $1"
already_passed "$1" || ( eval "$1" && passed_on "$1" ) || passed_on "$1"