feature: add HUSKY_SKIP_HOOKS support

[typicode]

When rebasing, it may be useful to be able to temporarily disable hooks. Unfortunately, it's not possible to do it with git rebase --no-verify, pre-commit hook is still run.

A test should be added in https://github.com/typicode/husky/blob/master/src/installer/getScript.ts#L54 to verify if HUSKY_SKIP_HOOKS is set to 1 or true, if that's the case the hook should display some message and exit.

$ HUSKY_SKIP_HOOKS=1 git rebase -i ...

Ideally a test could be added in https://github.com/typicode/husky/blob/master/.travis.yml to verify that hooks are skipped. Something like:

- HUSKY_SKIP_HOOK=1 time git checkout
# Check that no ci-post-checkout file was created via a ci-husky-skip-hooks.js script
# For example, see:
# https://github.com/typicode/husky/blob/master/scripts/ci-post-checkout-check.js

Related issues:
#468
#447

[asaf050]

+1
Facing the same issue , unable to skip post-commit hook.

[ozzywalsh]

Hi Guys,
I have created a pull request for this.
Feedback appreciated.

[typicode]

Thanks again @ozzywalsh for the PR, it'll be released soon.

[davinanaya]

Is there a way to run HUSKY_SKIP_HOOKS=1 in background when i run rebase ? is kind of tricky because if someone comes to a project and wants to make a rebase he dont know he needs to use HUSKY_SKIP_HOOKS. thanks

[qpxtWhite]

@davinanaya I add some script to pre-commit hook

BRANCH_NAME=$(git branch | grep '*' | sed 's/* //')
if [[ $BRANCH_NAME =~ "no branch" ]]; then
  echo "You are rebasing, skipping hook"
  exit 0
fi

[thoran]

In case you got here like I did and you're looking for what to do currently, then instead use HUSKY=0 if you want to skip the hooks.