hyperfine benchmark for finding git root from subdir

git_root.sh

pushd . >/dev/null; until [ -d .git ]; do cd ..; pwd; done | tail -n 1; popd -n > /dev/null;

hyperfine-results.md

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
git rev-parse show root	54.5 ± 38.3	28.8	249.2	1.19 ± 0.98
git !pwd	59.9 ± 46.5	25.1	260.5	1.31 ± 1.16
git !exec pwd	51.4 ± 20.8	25.8	122.4	1.12 ± 0.67
git_root.sh	45.9 ± 20.2	21.4	111.5	1.00

Summary

  git_root.sh ran
    1.12 ± 0.67 times faster than git !exec pwd
    1.19 ± 0.98 times faster than git rev-parse show root
    1.31 ± 1.16 times faster than git !pwd