Can you get the next commit id before items are commited?

问题

I'm currently adding a commit-msg hook that will add the git commit URL as a comment to Jira. The commit URL has the format

http://[server]/[group]/[project]/commit/[commit_id]

Is it possible to obtain the commit id or is it only produced after the item has been committed? Does this mean I need to implement this in a later hook?

回答1:

A git commit id is a SHA-1 hash of:

• The commit message
• Author and committer info
• The date
• The contents (the hash of the tree)
• The parent commit hash (or hashes, for merges)

So, the commit id can only be produced after the item has been committed.

来源：https://stackoverflow.com/questions/45850890/can-you-get-the-next-commit-id-before-items-are-commited