Add script to prepare patches

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

4 files changed, 974 insertions, 0 deletions

diff --git a/patches/COPYING b/patches/COPYING
new file mode 100644
index 0000000..be3f7b2
--- /dev/null
+++ b/patches/COPYING
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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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+  16. Limitation of Liability.
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/patches/README b/patches/README
new file mode 100644
index 0000000..5ccf0c4
--- /dev/null
+++ b/patches/README
@@ -0,0 +1,90 @@
+== Introduction ==
+
+Different people have different preferences as for which tools they like to
+use.
+
+For instance, to send mails, some people like to use the command like, other
+like to use web interfaces, other like to use graphical mail clients, etc.
+It's good to have so many choices as it empower people to adapt technology
+to them instead of having to adapt to a single way of doing things, which
+cannot even work for everybody or every use case.
+
+For the review of patches, different people also have different preferences.
+Some people like to use git to download the patches and then review them on
+their local computer, other like to review them in a mail client, and other
+like to review them on a web interface. What is more practical for a given
+person can also change on the characteristics of patches like its size.
+
+While this script is made for people that like to send patches from the
+command line, it helps them generate mails that makes it easy for
+reviewers to use the tool of their choices to review patches.
+
+This way, when reviewers will read the patch serie, along with the patches,
+there will also be an URL to clone the patches, an URL to a web interface
+to view the patches, and a friendly message to make it more human.
+
+The text is expected to be copy-pasted as it empower users using this tool to
+easily change the text, and spot bugs if there are any. Both would not be
+possible if the tool was fully automatic.
+
+== Configuration ==
+First copy the example configuration file in the configuration directory:
+  $ cp replicant_prepare_patch.conf ~/.config/replicant/
+
+Then modify the content of ~/.config/replicant/replicant_prepare_patch.conf
+to suit your needs.
+
+The configuration file path also follows the XDG Base Directory Specification
+which is available here:
+https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
+
+== Usage ==
+This tool expect you to setup a git remote that points to the repository
+you want to contribute to, in your namespace on the Replicant git server.
+
+For example I use GNUtoo as remote for the GNUtoo namespace:
+  $ git remote get-url GNUtoo
+  ssh://git@git.replicant.us/GNUtoo/vendor_replicant-scripts.git
+
+Unfortunately, at this time it's not possible to configure the name of
+that namespace for each individual repositories, as the code assume that
+it is always the same.
+
+Users using this script are expected to manually push the patch serie in
+the remote git repository, in any branch or tag they wish.
+
+This tool can then figure out where to find all the information it needs
+thanks to the git_remote setting that points to the name of the remote.
+As the git hash are used, it doesn't need to know in which branch or tags the
+code is pushed.
+
+Once everything is pushed, you can then use the script to generate the example
+mail text and the commands to send the mails. As we want to send only one patch
+starting from the current HEAD we can use this command:
+  $ ./replicant_prepare_patch.py HEAD 1
+  patches:
+  --------
+  0001-Add-script-to-prepare-patches.patch
+
+  git command:
+  ------------
+  git send-email --compose --to=replicant@osuosl.org 0001-Add-script-to-prepare-patches.patch
+
+  Cover mail:
+  -----------
+  Hi,
+
+  In addition to the patch that will follow in a response to
+  this mail, here's an URL to the see the patch in a web interface:
+  https://git.replicant.us/contrib/GNUtoo/vendor_replicant-scripts/commit/?id=5b6757fc6c6f852a4176bb7fc8f32e05c21f703f
+
+  And here's how to get it in a git repository:
+  git clone https://git.replicant.us/GNUtoo/vendor_replicant-scripts
+  cd vendor_replicant-scripts
+  git show 5b6757fc6c6f852a4176bb7fc8f32e05c21f703f
+
+  Denis.
+
+We can then use the git command which will prompt you to write an email to
+introduce the patch serie, where you can paste and potentially modify the cover
+mail.
diff --git a/patches/replicant_prepare_patch.conf b/patches/replicant_prepare_patch.conf
new file mode 100644
index 0000000..7f2c500
--- /dev/null
+++ b/patches/replicant_prepare_patch.conf
@@ -0,0 +1,9 @@
+[DEFAULT]
+
+[local]
+git_remote = GNUtoo
+mail_signature = Denis.
+
+[project]
+mailing_list = replicant@osuosl.org
+username = GNUtoo
diff --git a/patches/replicant_prepare_patch.py b/patches/replicant_prepare_patch.py
new file mode 100755
index 0000000..f76c28c
--- /dev/null
+++ b/patches/replicant_prepare_patch.py
@@ -0,0 +1,214 @@
+#!/bin/env python
+# Copyright (C) 2020 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import os, sys
+import re
+
+import configparser
+from sh import echo, git
+
+# Settings
+cover_mail_template = """Hi,
+
+In addition to the patch that will follow in a response to
+this mail, here's an URL to the see the patch in a web interface:
+{web_url}
+
+And here's how to get it in a git repository:
+git clone {clone_repo}
+cd {repo_name}
+git show {commit}
+
+{signature}
+"""
+
+
+def usage(progname):
+    print('{} <git_revision> [nr_patches] <patches_serie_revision>'.format(
+        progname))
+    sys.exit(1)
+
+
+def get_config():
+    # This should implement the XDG Base Directory Specification which is
+    # available here:
+    # https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
+
+    config_file = None
+
+    xdg_config_home = ''
+    try:
+        xdg_config_home = os.environ['XDG_CONFIG_HOME']
+    except KeyError:
+        pass
+
+    if xdg_config_home == '':
+        try:
+            xdg_config_home = os.environ['HOME'] + os.sep + '.config'
+        except KeyError:
+            # This follow strictly the specification
+            xdg_config_home = os.sep + '.config'
+
+    xdg_config_dirs = ''
+    try:
+        xdg_config_dirs = os.environ['XDG_CONFIG_DIRS']
+    except KeyError:
+        pass
+    if xdg_config_dirs == '':
+        xdg_config_dirs = os.sep + 'etc' + os.sep + 'xdg'
+
+    for base in [xdg_config_home] + xdg_config_dirs.split(os.pathsep):
+        config_path = base + os.sep + 'replicant' + os.sep \
+            + 'replicant_prepare_patch.conf'
+        if not os.path.isfile(config_path):
+            continue
+        try:
+            # Silently skip the file in case of issues as per the specification
+            config_file = open(config_path, 'r')
+        except:
+            pass
+
+        if config_file:
+            break
+
+    if config_file is None:
+        return None
+
+    config = configparser.ConfigParser()
+    config.read_file(config_file)
+    return config
+
+
+def get_repo_url(config):
+    output = git('remote', 'get-url', config['local']['git_remote'])
+    return output
+
+
+def get_repo_name(config):
+    output = git('remote', 'get-url', config['local']['git_remote'])
+    output = os.path.basename(str(output))
+    output = re.sub(os.linesep, '', output)
+    output = re.sub('\.git', '', output)
+
+    return output
+
+
+def get_subject_prefix(config, revision):
+    repo_name = get_repo_name(config)
+    project_name = repo_name.split('_')[-1]
+
+    if project_name == None:
+        return None
+
+    if revision == None:
+        return '{project}][PATCH'.format(project=project_name)
+    else:
+        return '{project}][PATCH {rev}]['.format(project=project_name,
+                                               rev=revision)
+
+
+def generate_patches(config, git_revision, nr_patches, patches_revision):
+    subject_prefix = get_subject_prefix(config, patches_revision)
+    if subject_prefix == None:
+        patches = git('format-patch',
+                      git_revision, '-{}'.format(nr_patches)).split(os.linesep)
+    else:
+        patches = git('format-patch', git_revision, '-{}'.format(nr_patches),
+                     '--subject-prefix={}'.format(
+                         subject_prefix)).split(os.linesep)
+
+    patches.remove('')
+
+    return patches
+
+
+def generate_cover_mail_text(config, commit, repo):
+    cgit_url = 'https://git.replicant.us/'
+
+    web_url = '{base}/contrib/{user}/{repo}/commit/?id={commit}'.format(
+        base=cgit_url, user=config['project']['username'], repo=repo,
+        commit=commit)
+
+    clone_repo = '{base}/{user}/{repo}'.format(
+        base=cgit_url, user=config['project']['username'], repo=repo)
+
+    signature = config['local']['mail_signature']
+
+    return cover_mail_template.format(web_url=web_url,
+                                      clone_repo=clone_repo,
+                                      commit=commit,
+                                      repo_name=repo,
+                                      signature=signature)
+
+
+def generate_git_send_email_command(config, git_revision, patches):
+    command = ['send-email',
+               '--compose',
+               '--to={}'.format(config['project']['mailing_list'])]
+
+    command += patches
+
+    return command
+
+
+def get_git_revision(git_revision):
+    output = git('--no-pager', 'log', '--oneline', git_revision, '-1',
+                 '--format=%H')
+    revision = re.sub(os.linesep, '', str(output))
+
+    return revision
+
+
+if __name__ == '__main__':
+    nr_patches = 1
+    patches_revision = None
+
+    if len(sys.argv) not in [2, 3, 4]:
+        usage(sys.argv[0])
+
+    if len (sys.argv) >= 3:
+        nr_patches = sys.argv[2]
+
+    if len (sys.argv) >= 4:
+        patches_revision = sys.argv[3]
+
+    config = get_config()
+
+    if config == None:
+        print('Failed to find a configuration file')
+        sys.exit(1)
+
+    git_revision = get_git_revision(sys.argv[1])
+
+
+    patches = generate_patches(config, git_revision, nr_patches,
+                               patches_revision)
+
+    print('patches:')
+    print('--------')
+    for patch in patches:
+        print(patch)
+
+    print()
+    print('git command:')
+    print('------------')
+    print('git ' + ' '.join(
+        generate_git_send_email_command(config, git_revision, patches)))
+
+    print()
+    print('Cover mail:')
+    print('-----------')
+    print(generate_cover_mail_text(config, git_revision, get_repo_name(config)))