Subject: Re: [PATCH v2 09/13] git-p4: use 'git hook' to run hooks

From: Emily Shaffer <[email-masked]>
Date: Fri, 15 Oct 2021 10:08:42 -0700

On Fri, Oct 15, 2021 at 11:43:37AM +0200, Ævar Arnfjörð Bjarmason wrote:
> 
> 
> Instead of duplicating the behavior of run-command.h:run_hook_le() in
> Python, we can directly call 'git hook run'. We emulate the existence
> check with the --ignore-missing flag.
> 
> As this is the last hook execution in git.git to not go through "git
> hook run" or the hook.[ch] library we can now be absolutely sure that
> our assertion in hook.c that only hooks known by the generated (from
> githooks(5)) hook-list.h are permitted.
> 
> Signed-off-by: Emily Shaffer <[email-masked]>
> Signed-off-by: Ævar Arnfjörð Bjarmason <[email-masked]>
> ---
>  git-p4.py | 72 ++++++-------------------------------------------------
>  1 file changed, 7 insertions(+), 65 deletions(-)
> 
> diff --git a/git-p4.py b/git-p4.py
> index 2b4500226aa..1f24cbf0bca 100755
> --- a/git-p4.py
> +++ b/git-p4.py
> @@ -207,71 +207,13 @@ def decode_path(path):
>          return path
>  
>  def run_git_hook(cmd, param=[]):
> -    """Execute a hook if the hook exists."""
> -    if verbose:
> -        sys.stderr.write("Looking for hook: %s\n" % cmd)
> -        sys.stderr.flush()
> -
> -    hooks_path = gitConfig("core.hooksPath")
> -    if len(hooks_path) <= 0:
> -        hooks_path = os.path.join(os.environ["GIT_DIR"], "hooks")
> -
> -    if not isinstance(param, list):
> -        param=[param]
> -
> -    # resolve hook file name, OS depdenent
> -    hook_file = os.path.join(hooks_path, cmd)
> -    if platform.system() == 'Windows':
> -        if not os.path.isfile(hook_file):
> -            # look for the file with an extension
> -            files = glob.glob(hook_file + ".*")
> -            if not files:
> -                return True
> -            files.sort()
> -            hook_file = files.pop()
> -            while hook_file.upper().endswith(".SAMPLE"):
> -                # The file is a sample hook. We don't want it
> -                if len(files) > 0:
> -                    hook_file = files.pop()
> -                else:
> -                    return True
> -
> -    if not os.path.isfile(hook_file) or not os.access(hook_file, os.X_OK):
> -        return True
> -
> -    return run_hook_command(hook_file, param) == 0
> -
> -def run_hook_command(cmd, param):
> -    """Executes a git hook command
> -       cmd = the command line file to be executed. This can be
> -       a file that is run by OS association.
> -
> -       param = a list of parameters to pass to the cmd command
> -
> -       On windows, the extension is checked to see if it should
> -       be run with the Git for Windows Bash shell.  If there
> -       is no file extension, the file is deemed a bash shell
> -       and will be handed off to sh.exe. Otherwise, Windows
> -       will be called with the shell to handle the file assocation.
> -
> -       For non Windows operating systems, the file is called
> -       as an executable.
> -    """
> -    cli = [cmd] + param
> -    use_shell = False
> -    if platform.system() == 'Windows':
> -        (root,ext) = os.path.splitext(cmd)
> -        if ext == "":
> -            exe_path = os.environ.get("EXEPATH")
> -            if exe_path is None:
> -                exe_path = ""
> -            else:
> -                exe_path = os.path.join(exe_path, "bin")
> -            cli = [os.path.join(exe_path, "SH.EXE")] + cli
> -        else:
> -            use_shell = True
> -    return subprocess.call(cli, shell=use_shell)
> -
> +    """args are specified with -a <arg> -a <arg> -a <arg>"""

Ah, the comment is misleading now, since we're adding args after the --.

> +    args = ['git', 'hook', 'run', '--ignore-missing', cmd]
> +    if param:
> +        args.append("--")
> +        for p in param:
> +            args.append(p)
> +    return subprocess.call(args) == 0
>  
>  def write_pipe(c, stdin):
>      if verbose:
> -- 
> 2.33.1.1338.g20da966911a
>