[PATCH v4] nmbug: Add an 'init' command

[Tomi Ollila]

On Mon, Jan 19 2015, "W. Trevor King" <wking at tremily.us> wrote:

> For folks that want to start versioning a new tag-space, instead of
> cloning one that someone else has already started.
>
> The empty-blob hash-object call avoids errors like:
>
>   $ nmbug commit
>   error: invalid object 100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 for
> 'tags/...'
>   fatal: git-write-tree: error building trees
>   'git HASH(0x9ef3eb8) write-tree' exited with nonzero value
>
> David Bremner suggested [1]:
>
>   $ git hash-object -w /dev/null
>
> instead of my Python version of:
>
>   $ git hash-object -w --stdin <&-
>
> but I expect that closing stdin is more portable than the /dev/null
> path (which doesn't exist on Windows, for example).

I agree with this...

I attempted to try this (being stup^H^H^H^Hadventurous and not backupping
~/.nmbug -- should the existence be checked first ???) and got the following ;/

$ python2.7 devel/nmbug/nmbug init
Reinitialized existing Git repository in /home/too/.nmbug/
e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
user.name not defined
[u'git', u'--git-dir', u'/home/too/.nmbug', u'commit', u'--allow-empty',
u'-m', u'Start a new nmbug repository'] exited with 1
zsh: exit 1     python2.7 devel/nmbug/nmbug init

This is due to my default /path/to/git-templates/pre-commit forbidding
commits unless I've configured user.name & user.email for that particular
repository....

I guess there is not much one can do to handle users' mystic global
hooks -- I'll look (later) whether e.g. '--no-hooks' parameter could be given
to nmbug from command line...

... Ok, it was --no-verify and patching that to the command line worked --
git complained that "Your name and email address were configured
automatically based on your username and hostname..." but commit succeeded :).

... but Now I issued nmbug init twice. now there are 2 

    Start a new nmbug repository

commits. I think it should be checked so that init on already-existing
repository does not succeed.


Tomi

>
> The --bare init and use of NMBGIT as the work tree (what could go
> wrong with an empty commit?) are suggestions from Michal Sojka [2].
>
> [1]: id:87y4vu6uvf.fsf at maritornes.cs.unb.ca
>      http://thread.gmane.org/gmane.mail.notmuch.general/18626/focus=18720
> [2]: id:87a93a5or2.fsf at resox.2x.cz
>      http://thread.gmane.org/gmane.mail.notmuch.general/19495/focus=19767
> ---
> Since v3 [1] I've incorporated Michal's suggestions [2]:
>
> * Start with 'git --git-dir {NMBGIT} init --bare
> * Use NMBGIT instead of a temporary workdir when creating the initial
>   “Start a new nmbug repository” commit.
>
> As well as the core.logallrefupdates tweak I turned up in testing [3].
>
> [1]: id:113512958b3fd64902517c1c55576faef816f852.1414532174.git.wking at tremily.us
>      http://thread.gmane.org/gmane.mail.notmuch.general/19495
> [2]: id:87a93a5or2.fsf at resox.2x.cz
>      http://thread.gmane.org/gmane.mail.notmuch.general/19495/focus=19767
> [3]: id:20141129201829.GI4062 at odin.tremily.us
>      http://thread.gmane.org/gmane.mail.notmuch.general/19495/focus=19774
>
>  devel/nmbug/nmbug | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/devel/nmbug/nmbug b/devel/nmbug/nmbug
> index 932ec12..1297345 100755
> --- a/devel/nmbug/nmbug
> +++ b/devel/nmbug/nmbug
> @@ -374,6 +374,25 @@ def fetch(remote=None):
>      _git(args=args, wait=True)
>  
>  
> +def init(remote=None):
> +    """
> +    Create an empty nmbug repository.
> +
> +    This wraps 'git init' with a few extra steps to support subsequent
> +    status and commit commands.
> +    """
> +    _spawn(args=['git', '--git-dir', NMBGIT, 'init', '--bare'], wait=True)
> +    _git(args=['config', 'core.logallrefupdates', 'true'], wait=True)
> +    # create an empty blob (e69de29bb2d1d6434b8b29ae775ad8c2e48c5391)
> +    _git(args=['hash-object', '-w', '--stdin'], input='', wait=True)
> +    _git(
> +        args=[
> +            'commit', '--allow-empty', '-m', 'Start a new nmbug repository'
> +        ],
> +        additional_env={'GIT_WORK_TREE': NMBGIT},
> +        wait=True)
> +
> +
>  def checkout():
>      """
>      Update the notmuch database from Git.
> @@ -725,6 +744,7 @@ if __name__ == '__main__':
>              'commit',
>              'fetch',
>              'help',
> +            'init',
>              'log',
>              'merge',
>              'pull',
> -- 
> 2.1.0.60.g85f0837