Any reason why a pre-commit hook can't be used?

Assuming that `git push -f` is never used and that every committer uses
it, pre-commit is guaranteed to be executed on all commits that are
pushed to the remote.

pre-commit can check QA and even automate changelog, so instead of:

$ cvs update
$ cvs add foo
$ echangelog "fixed #xxxxxx in foo"
$ repoman commit

We have:

$ git pull
$ git add foo
$ echangelog "fixed #xxxxxx in foo"
$ git commit

To set up:

$ cat > .git/hooks/pre-commit << EOF
#!/bin/sh
repoman scan
EOF

Seems simple enough, as long as `repoman scan` runs quickly.