[{"id":30721,"web_url":"https://patchwork.libcamera.org/comment/30721/","msgid":"<87ikw6w87q.fsf@redhat.com>","date":"2024-08-12T06:44:57","subject":"Re: [PATCH 1/3] utils: checkstyle.py: Rework commit message parsing","submitter":{"id":177,"url":"https://patchwork.libcamera.org/api/people/177/","name":"Milan Zamazal","email":"mzamazal@redhat.com"},"content":"Hi Laurent,\n\nthank you for the improvement.\n\nLaurent Pinchart writes:\n\n> When parsing commit messages, the Commit class tries to optimize the\n> process by invoking git-show once only, extracting both the commit\n> author, title and modified files in one go. As a result, the derived\n> Amendment class needs to implement the commit parsing separately, as the\n> modified files need to be extracted differently for amendments (and the\n> commit ID also needs to be retrieved differently). Furthermore, because\n> of the list of named files, extracting the trailers needs to invoke\n> git-show separately.\n>\n> Improve the situation by reworking the commit message parsing in three\n> steps. In the first step, use git-show to extract the commit ID, author,\n> title and body. In the second step, invoke git-interpret-trailers to\n> extract the trailers from the body that was previously extracted. The\n> third and final step extracts the list of modified files, using\n> different methods for regular commits and amendments.\n>\n> This allows sharing code for the first two steps between the Commit and\n> Amendment classes, making the code simpler. The Commit class still\n> invokes git three times, while the Amendment class runs it three times\n> instead of four, improving performance slightly.\n>\n> Signed-off-by: Laurent Pinchart \n\nReviewed-by: Milan Zamazal \n\n> ---\n> utils/checkstyle.py | 60 +++++++++++++++++++++++++--------------------\n> 1 file changed, 33 insertions(+), 27 deletions(-)\n>\n> diff --git a/utils/checkstyle.py b/utils/checkstyle.py\n> index dae5d518920a..aa0731abdb5a 100755\n> --- a/utils/checkstyle.py\n> +++ b/utils/checkstyle.py\n> @@ -211,33 +211,42 @@ class CommitFile:\n> \n> class Commit:\n> def __init__(self, commit):\n> - self.commit = commit\n> + self._commit = commit\n> self._author = None\n> self._trailers = []\n> self._parse()\n> \n> - def _parse_trailers(self):\n> - proc_show = subprocess.run(['git', 'show', '--format=%b',\n> - '--no-patch', self.commit],\n> - stdout=subprocess.PIPE)\n> + def _parse_commit(self):\n> + # Get and parse the commit message.\n> + ret = subprocess.run(['git', 'show', '--format=%H%n%an <%ae>%n%s%n%b',\n> + '--no-patch', self.commit],\n> + stdout=subprocess.PIPE).stdout.decode('utf-8')\n> + lines = ret.splitlines()\n> +\n> + self._commit = lines[0]\n> + self._author = lines[1]\n> + self._title = lines[2]\n> + self._body = lines[3:]\n> +\n> + # Parse the trailers. Feed git-interpret-trailers with a full commit\n> + # message that includes both the title and the body, as it otherwise\n> + # fails to find trailers when the body contains trailers only.\n> + message = self._title + '\\n\\n' + '\\n'.join(self._body)\n> trailers = subprocess.run(['git', 'interpret-trailers', '--parse'],\n> - input=proc_show.stdout,\n> + input=message.encode('utf-8'),\n> stdout=subprocess.PIPE).stdout.decode('utf-8')\n> \n> self._trailers = trailers.splitlines()\n> \n> def _parse(self):\n> - # Get the commit title and list of files.\n> - ret = subprocess.run(['git', 'show', '--format=%an <%ae>%n%s',\n> - '--name-status', self.commit],\n> + self._parse_commit()\n> +\n> + # Get the list of files. Use an empty format specifier to suppress the\n> + # commit message completely.\n> + ret = subprocess.run(['git', 'show', '--format=', '--name-status',\n> + self.commit],\n> stdout=subprocess.PIPE).stdout.decode('utf-8')\n> - lines = ret.splitlines()\n> -\n> - self._author = lines[0]\n> - self._title = lines[1]\n> - self._files = [CommitFile(f) for f in lines[2:] if f]\n> -\n> - self._parse_trailers()\n> + self._files = [CommitFile(f) for f in ret.splitlines()]\n> \n> def files(self, filter='AMR'):\n> return [f.filename for f in self._files if f.status in filter]\n> @@ -246,6 +255,10 @@ class Commit:\n> def author(self):\n> return self._author\n> \n> + @property\n> + def commit(self):\n> + return self._commit\n> +\n> @property\n> def title(self):\n> return self._title\n> @@ -284,21 +297,14 @@ class StagedChanges(Commit):\n> \n> class Amendment(Commit):\n> def __init__(self):\n> - Commit.__init__(self, '')\n> + Commit.__init__(self, 'HEAD')\n> \n> def _parse(self):\n> - # Create a title using HEAD commit and parse the trailers.\n> - ret = subprocess.run(['git', 'show', '--format=%an <%ae>%n%H %s',\n> - '--no-patch'],\n> - stdout=subprocess.PIPE).stdout.decode('utf-8')\n> - lines = ret.splitlines()\n> + self._parse_commit()\n> \n> - self._author = lines[0]\n> - self._title = 'Amendment of ' + lines[1]\n> + self._title = f'Amendment of \"{self.title}\"'\n> \n> - self._parse_trailers()\n> -\n> - # Extract the list of modified files\n> + # Extract the list of modified files.\n> ret = subprocess.run(['git', 'diff', '--staged', '--name-status', 'HEAD~'],\n> stdout=subprocess.PIPE).stdout.decode('utf-8')\n> self._files = [CommitFile(f) for f in ret.splitlines()]\n>\n> base-commit: 62760bd2605a83e663b9003244ff42f8946f8955","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 83C48C323E\n\tfor ;\n\tMon, 12 Aug 2024 06:45:08 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 2526B633B5;\n\tMon, 12 Aug 2024 08:45:07 +0200 (CEST)","from us-smtp-delivery-124.mimecast.com\n\t(us-smtp-delivery-124.mimecast.com [170.10.133.124])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 4BF776338D\n\tfor ;\n\tMon, 12 Aug 2024 08:45:04 +0200 (CEST)","from mail-ed1-f70.google.com (mail-ed1-f70.google.com\n\t[209.85.208.70]) by relay.mimecast.com with ESMTP with STARTTLS\n\t(version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id\n\tus-mta-646-uGz8J0YPOxe4Mf-9-xI8vg-1; Mon, 12 Aug 2024 02:45:01 -0400","by mail-ed1-f70.google.com with SMTP id\n\t4fb4d7f45d1cf-5a74845546bso3423962a12.2\n\tfor ;\n\tSun, 11 Aug 2024 23:45:00 -0700 (PDT)","from nuthatch (ip-77-48-47-2.net.vodafone.cz. 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As a result, the derived\n> Amendment class needs to implement the commit parsing separately, as the\n> modified files need to be extracted differently for amendments (and the\n> commit ID also needs to be retrieved differently). Furthermore, because\n> of the list of named files, extracting the trailers needs to invoke\n> git-show separately.\n>\n> Improve the situation by reworking the commit message parsing in three\n> steps. In the first step, use git-show to extract the commit ID, author,\n> title and body. In the second step, invoke git-interpret-trailers to\n> extract the trailers from the body that was previously extracted. The\n> third and final step extracts the list of modified files, using\n> different methods for regular commits and amendments.\n>\n> This allows sharing code for the first two steps between the Commit and\n> Amendment classes, making the code simpler. The Commit class still\n> invokes git three times, while the Amendment class runs it three times\n> instead of four, improving performance slightly.\n>\n> Signed-off-by: Laurent Pinchart \n> ---\n\n\nReviewed-by: Daniel Scally \n\n> utils/checkstyle.py | 60 +++++++++++++++++++++++++--------------------\n> 1 file changed, 33 insertions(+), 27 deletions(-)\n>\n> diff --git a/utils/checkstyle.py b/utils/checkstyle.py\n> index dae5d518920a..aa0731abdb5a 100755\n> --- a/utils/checkstyle.py\n> +++ b/utils/checkstyle.py\n> @@ -211,33 +211,42 @@ class CommitFile:\n> \n> class Commit:\n> def __init__(self, commit):\n> - self.commit = commit\n> + self._commit = commit\n> self._author = None\n> self._trailers = []\n> self._parse()\n> \n> - def _parse_trailers(self):\n> - proc_show = subprocess.run(['git', 'show', '--format=%b',\n> - '--no-patch', self.commit],\n> - stdout=subprocess.PIPE)\n> + def _parse_commit(self):\n> + # Get and parse the commit message.\n> + ret = subprocess.run(['git', 'show', '--format=%H%n%an <%ae>%n%s%n%b',\n> + '--no-patch', self.commit],\nI should read the whole commit when I get confused; it took me way too long to spot that this now \nreferences the property.\n> + stdout=subprocess.PIPE).stdout.decode('utf-8')\n> + lines = ret.splitlines()\n> +\n> + self._commit = lines[0]\n> + self._author = lines[1]\n> + self._title = lines[2]\n> + self._body = lines[3:]\n> +\n> + # Parse the trailers. Feed git-interpret-trailers with a full commit\n> + # message that includes both the title and the body, as it otherwise\n> + # fails to find trailers when the body contains trailers only.\n> + message = self._title + '\\n\\n' + '\\n'.join(self._body)\n> trailers = subprocess.run(['git', 'interpret-trailers', '--parse'],\n> - input=proc_show.stdout,\n> + input=message.encode('utf-8'),\n> stdout=subprocess.PIPE).stdout.decode('utf-8')\n> \n> self._trailers = trailers.splitlines()\n> \n> def _parse(self):\n> - # Get the commit title and list of files.\n> - ret = subprocess.run(['git', 'show', '--format=%an <%ae>%n%s',\n> - '--name-status', self.commit],\n> + self._parse_commit()\n> +\n> + # Get the list of files. Use an empty format specifier to suppress the\n> + # commit message completely.\n> + ret = subprocess.run(['git', 'show', '--format=', '--name-status',\n> + self.commit],\n> stdout=subprocess.PIPE).stdout.decode('utf-8')\n> - lines = ret.splitlines()\n> -\n> - self._author = lines[0]\n> - self._title = lines[1]\n> - self._files = [CommitFile(f) for f in lines[2:] if f]\n> -\n> - self._parse_trailers()\n> + self._files = [CommitFile(f) for f in ret.splitlines()]\n> \n> def files(self, filter='AMR'):\n> return [f.filename for f in self._files if f.status in filter]\n> @@ -246,6 +255,10 @@ class Commit:\n> def author(self):\n> return self._author\n> \n> + @property\n> + def commit(self):\n> + return self._commit\n> +\n> @property\n> def title(self):\n> return self._title\n> @@ -284,21 +297,14 @@ class StagedChanges(Commit):\n> \n> class Amendment(Commit):\n> def __init__(self):\n> - Commit.__init__(self, '')\n> + Commit.__init__(self, 'HEAD')\n> \n> def _parse(self):\n> - # Create a title using HEAD commit and parse the trailers.\n> - ret = subprocess.run(['git', 'show', '--format=%an <%ae>%n%H %s',\n> - '--no-patch'],\n> - stdout=subprocess.PIPE).stdout.decode('utf-8')\n> - lines = ret.splitlines()\n> + self._parse_commit()\n> \n> - self._author = lines[0]\n> - self._title = 'Amendment of ' + lines[1]\n> + self._title = f'Amendment of \"{self.title}\"'\n> \n> - self._parse_trailers()\n> -\n> - # Extract the list of modified files\n> + # Extract the list of modified files.\n> ret = subprocess.run(['git', 'diff', '--staged', '--name-status', 'HEAD~'],\n> stdout=subprocess.PIPE).stdout.decode('utf-8')\n> self._files = [CommitFile(f) for f in ret.splitlines()]\n>\n> base-commit: 62760bd2605a83e663b9003244ff42f8946f8955","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id ADB31BE173\n\tfor ;\n\tMon, 12 Aug 2024 12:42:08 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id AEB4F633BA;\n\tMon, 12 Aug 2024 14:42:07 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 86E86633B3\n\tfor ;\n\tMon, 12 Aug 2024 14:42:06 +0200 (CEST)","from [192.168.0.43]\n\t(cpc141996-chfd3-2-0-cust928.12-3.cable.virginm.net [86.13.91.161])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 23B966B5\n\tfor ;\n\tMon, 12 Aug 2024 14:41:10 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; 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