The script `make/scripts/update_copyright.sh` relies on the path to the script for git detection, which is fragile or does not work at all or git worktrees. This PR uses git itself to detect whether the script is running in a git repository. This has the added benefit that the script can be executed from anywhere in the repository.
------------- Commit messages: - Better git detection Changes: https://git.openjdk.org/jdk/pull/24828/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24828&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8355400 Stats: 13 lines in 1 file changed: 6 ins; 4 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/24828.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/24828/head:pull/24828 PR: https://git.openjdk.org/jdk/pull/24828
