Initial, works-for-me script to import Gitlab issues to Sourcehut.

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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
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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/README.md b/README.md
new file mode 100644
index 0000000..3546eba
--- /dev/null
+++ b/README.md
@@ -0,0 +1,26 @@
+# lazygl2srht - Gitlab to Sourcehut issue migration tool
+
+This is a program for importing issues from an exported Gitlab project into a
+fresh Sourcehut tracker, via SMTP.  I am lazy, so this works well enough for my
+simple projects, but certainly doesn't include all data that could be included,
+and also requires some manual work on your part for best results.
+
+Documentation is included at the top of `import_issues.py`.  Please read that
+before running an import.
+
+## License
+
+Copyright 2024 Bryan Gardiner <bog@khumba.net>
+
+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/>.
diff --git a/import_issues.py b/import_issues.py
new file mode 100755
index 0000000..245cb55
--- /dev/null
+++ b/import_issues.py
@@ -0,0 +1,595 @@
+#!/usr/bin/env python3
+
+# Copyright 2024 Bryan Gardiner <bog@khumba.net>
+#
+# 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/>.
+
+
+# Imports issues from an exported Gitlab project into a Sourcehut tracker.
+#
+# Reads *.ndjson files from an exported Gitlab project, and recreates tickets
+# and their histories in a new, empty Sourcehut tracker.  Preserves notes
+# attached to each issue; generally this includes comments, status changes,
+# labels, milestones, and anything else that is included in as a plain text
+# note, but definitely doesn't include all available metadata.
+#
+# Tickets are created in sr.ht via SMTP, so a working mail setup is required.
+# Surely using Sourcehut's API would be better.
+#
+# There are a few of big caveats:
+#
+# 1. If all issue IDs from 1 to the max ID are available in your export, and the
+# tracker you import into is a new tracker, then your Gitlab and Sourcehut issue
+# IDs will match up one-to-one.  If not, then all bets are off.  The ticket
+# descriptions in Sourcehut will indicate the original Gitlab ID, but no
+# rewriting of text is done, so issue references will be incorrect.  By default,
+# the script tries to avoid this by checking that all IDs from 1 to the number
+# of issues are in the export, and aborting if not.  To override this, pass
+# --allow-missing-issues.
+#
+# 2. Because emails are used to create tickets, we also assume that emails are
+# processed in the order that they are sent, so that tickets don't get created
+# out of order.  This program has no way of knowing if that happens, however,
+# there is a configurable delay between sending each email, for this reason.
+#
+# 3. Gitlab project exports are missing some crucial information, in particular
+# they don't include ticket author names or label IDs.  For best results,
+# appropriate mappings for your project can be filled in manually in the LABELS
+# and USERS dicts below, if desired, or these features can be disabled.  See the
+# documentation for these variables.
+#
+# 4. The projects I have tested this on are small, and don't make use of many of
+# Gitlab's features.  This may bork on more complex projects.
+
+
+# Still here?  Here's how to use this:
+#
+# First take an export of your Gitlab project from its settings area, then
+# extract the archive.  The important files are tree/project/*.ndjson.
+#
+# Let's generate a report of all the emails that would be sent.  Preview the
+# output to make sure things look right, and ensure that the command completes
+# without error:
+#
+# ./import_issues.py \
+#     --srht-owner=MY_SRHT_USER \
+#     --srht-tracker=MY_SRHT_TRACKER \
+#     --gitlab-project-url=https://gitlab.com/ME/PROJECT/ \
+#     --from='Moi <me@email.com>' \
+#     .../gitlab-export/tree/project \
+#     >issue-emails.txt
+#
+# You may get errors if you are missing label or user mappings, and you haven't
+# disabled these; see the LABELS and USERS variables below.
+#
+# If this file looks correct, then you can proceed with sending emails.
+# Double-check that your tracket is empty to start with, then rerun the command
+# with "--mode=send" and with your SMTP parameters.  SMTP options can be
+# specified either via parameters --smtp-{host,port,user,password} or the
+# equivalent SMTP_{HOST,PORT,USER,PASSWORD} environment variables.  Pass
+# --smtp-ssl to enable SSL.  Also by default there is a five-second delay
+# between sending emails, that you may wish to change with --smtp-delay.
+#
+# ./import_issues.py \
+#     --srht-owner=MY_SRHT_USER \
+#     --srht-tracker=MY_SRHT_TRACKER \
+#     --gitlab-project-url=https://gitlab.com/ME/PROJECT/ \
+#     --from='Moi <me@email.com>' \
+#     --smtp-host=SMTP_HOSTNAME \
+#     --smtp-ssl \
+#     --smtp-user=SMTP_USERNAME \
+#     --smtp-password=SMTP_PASSWORD \
+#     .../gitlab-export/tree/project
+
+
+import argparse
+import json
+import os
+import re
+import smtplib
+import time
+from email.message import EmailMessage
+from email.utils import format_datetime, make_msgid
+from datetime import datetime
+from pathlib import Path
+from typing import Dict, List, Optional
+
+
+# Mapping from label IDs to names for the project.  This info is unfortunately
+# not included in the Gitlab project export, and it's needed to transform raw
+# label IDs into label names in issue notes.
+#
+# Any missing labels that are referenced from issues will cause an exception to
+# be thrown.  Run with --mode=print first to make sure no labels are missing,
+# before using --mode=send.
+#
+# Alternatively, set this to None to disable translation of label IDs to names.
+LABELS: Optional[Dict[int, str]] = {
+    # 123456: "Bug",
+    # 232323: "Feature",
+    # ...
+}
+
+
+# Mapping from user IDs to strings to use for their names when recording who
+# created each ticket.  Gitlab exports user full names (but not necessarily
+# IDs) names (but not necessarily IDs) for each note on an issue, but for the
+# creator of an issue, only exports the user ID, no name.
+#
+# Any missing users that created issues will cause an exception to be thrown.
+# Run with --mode=print first to make sure no users are missing, before using
+# --mode=send.
+#
+# Alternatively, set this to None to disable recording issue creators.
+#
+# TODO Might be able to automatically map note.events.author_id to note.author.name.
+USERS: Optional[Dict[int, str]] = {
+    # 1234000: "John Joe (@jdoe)",
+    # ...
+}
+
+
+email_count = 0
+issue_count = 0
+
+
+def do_mail(
+        *,
+        smtp,
+        smtp_delay: float,
+        mode: str,
+        frm: str,
+        to: str,
+        body: str,
+        subject: Optional[str] = None,
+):
+    global email_count
+    email_count += 1
+    print(f"---- #{email_count}")
+
+    date = format_datetime(datetime.utcnow())
+    msg_id = make_msgid()
+
+    if mode == "print":
+        print(f"From: {frm}")
+        print(f"To: {to}")
+        print(f"Date: {date}")
+        if subject:
+            print(f"Subject: {subject}")
+        print(f"Message-ID: {msg_id}")
+        print()
+        print(body)
+
+    elif mode == "send":
+        msg = EmailMessage()
+        msg.set_content(body)
+        msg["From"] = frm
+        msg["To"] = to
+        msg["Date"] = date
+        if subject:
+            msg["Subject"] = subject
+
+        # Message-ID is required, unless you want this error message from the
+        # sr.ht mail server:
+        #
+        # 500 Error: (AttributeError) 'NoneType' object has no attribute
+        # 'removeprefix' (in reply to end of DATA command)
+        msg["Message-ID"] = msg_id
+
+        smtp.send_message(msg)
+
+        time.sleep(smtp_delay)
+
+    else:
+        raise RuntimeError(f"Unknown mode: {mode!r}")
+
+
+def open_ticket(
+        *,
+        smtp,
+        smtp_delay: float,
+        mode: str,
+        srht_owner: str,
+        srht_tracker: str,
+        frm: str,
+        title: str,
+        body: str,
+        created_by: Optional[str],
+        created_at: str,
+        closed_at: Optional[str],
+        is_closed: bool,
+        label_names: List[str],
+        milestone_name: Optional[str],
+        gitlab_ticket_url: str,
+) -> int:
+    global issue_count
+
+    lines = []
+    pheaders = []
+
+    pheaders.append(f"Migrated from: {gitlab_ticket_url}")
+
+    if created_by:
+        pheaders.append(f"Created by: {created_by}")
+    pheaders.append(f"Created at: {created_at}")
+
+    if closed_at is not None:
+        pheaders.append(f"Closed at: {closed_at}")
+    elif is_closed:
+        pheaders.append("State: closed")
+
+    if milestone_name:
+        pheaders.append(f"Milestone: {milestone_name}")
+
+    if label_names:
+        pheaders.append("Labels: " + ", ".join(sorted(label_names)))
+
+    lines.append(" \\\n".join(pheaders))
+    lines.append("")
+    lines.append(body)
+
+    do_mail(
+        smtp=smtp,
+        smtp_delay=smtp_delay,
+        mode=mode,
+        frm=frm,
+        to=f"~{srht_owner}/{srht_tracker}@todo.sr.ht",
+        subject=title,
+        body="\n".join(lines),
+    )
+
+    issue_count += 1
+    return issue_count
+
+
+def send_comment(
+        *,
+        smtp,
+        smtp_delay: float,
+        mode: str,
+        srht_owner: str,
+        srht_tracker: str,
+        frm: str,
+        issue_id: int,
+        body: str,
+        author_name: str,
+        created_at: str,
+        last_edited_at: str,
+        is_system: bool,
+):
+    lines = []
+
+    if is_system:
+        # (Skipping pseudoheaders array here, only have one.)
+        lines.append(f"Changed at: {created_at}")
+    else:
+        lines.append(f"On {created_at}, {author_name} wrote:")
+
+    lines.append("")
+    lines.append(body)
+
+    if last_edited_at and last_edited_at != created_at:
+        lines.append("")
+        lines.append(f"(Last edited at {last_edited_at}.)")
+
+    do_mail(
+        smtp=smtp,
+        smtp_delay=smtp_delay,
+        mode=mode,
+        frm=frm,
+        to=f"~{srht_owner}/{srht_tracker}/{issue_id}@todo.sr.ht",
+        body="\n".join(lines),
+    )
+
+
+def close_ticket(
+        *,
+        smtp,
+        smtp_delay: float,
+        mode: str,
+        srht_owner: str,
+        srht_tracker: str,
+        frm: str,
+        issue_id: int,
+        closed_at: Optional[str],
+        is_closed: bool,
+):
+    lines = []
+
+    if closed_at is not None:
+        # (Skipping pseudoheaders array here, only have one.)
+        lines.append(f"Closed at: {closed_at}")
+    elif is_closed:
+        lines.append("Ticket closed.")
+
+    lines.append("")
+    lines.append("!resolve fixed")
+
+    do_mail(
+        smtp=smtp,
+        smtp_delay=smtp_delay,
+        mode=mode,
+        frm=frm,
+        to=f"~{srht_owner}/{srht_tracker}/{issue_id}@todo.sr.ht",
+        body="\n".join(lines),
+    )
+
+
+def run(
+        *,
+        smtp,
+        smtp_delay: float,
+        mode: str,
+        srht_owner: str,
+        srht_tracker: str,
+        frm: str,
+        export_dir_path: Path,
+        gitlab_project_url: str,
+        allow_missing_issues: bool,
+):
+    milestone_jsons = []
+    with open(export_dir_path / 'milestones.ndjson') as milestones_file:
+        for line in milestones_file:
+            milestone_jsons.append(json.loads(line))
+
+    milestone_ids_to_titles = {}
+    for milestone_json in milestone_jsons:
+        milestone_ids_to_titles[milestone_json['iid']] = milestone_json['title']
+
+    issue_jsons = []
+    with open(export_dir_path / 'issues.ndjson') as issues_file:
+        for line in issues_file:
+            issue_jsons.append(json.loads(line))
+
+    issue_jsons.sort(key=lambda x: x['iid'])
+    if not allow_missing_issues:
+        assert [x['iid'] for x in issue_jsons] == list(range(1, len(issue_jsons) + 1)), \
+            f"Don't have all issues from 1 to {len(issue_jsons)}, cannot proceed."
+
+    for issue_json in issue_jsons:
+        issue_json['notes'].sort(key=lambda x: x['created_at'])
+
+    print("-------- CREATING TICKETS")
+
+    issue_id_map: Dict[int, int] = {}
+
+    for issue_json in issue_jsons:
+        gitlab_issue_id = issue_json['iid']
+        author_id = issue_json['author_id']
+        created_by: Optional[str]
+        if USERS is None:
+            created_by = None
+        else:
+            assert author_id in USERS, \
+                f"Unknown author #{author_id} of ticket #{gitlab_issue_id}, please add to USERS."
+            created_by = USERS[author_id]
+
+        srht_issue_id = open_ticket(
+            smtp=smtp,
+            smtp_delay=smtp_delay,
+            mode=mode,
+            srht_owner=srht_owner,
+            srht_tracker=srht_tracker,
+            frm=frm,
+            title=issue_json['title'],
+            body=issue_json['description'],
+            created_by=created_by,
+            created_at=issue_json['created_at'],
+            closed_at=issue_json['closed_at'],
+            is_closed=(issue_json['state'] == 'closed'),
+            label_names=[x['label']['title'] for x in issue_json['label_links']],
+            milestone_name=issue_json.get('milestone', {}).get('title') or None,
+            gitlab_ticket_url=f"{gitlab_project_url}/-/issues/{gitlab_issue_id}",
+        )
+
+        if not allow_missing_issues:
+            assert srht_issue_id == gitlab_issue_id, \
+                f"Internal error, srht_issue_id {srht_issue_id} != " \
+                f"gitlab_issue_id {gitlab_issue_id}."
+
+        issue_id_map[gitlab_issue_id] = srht_issue_id
+
+    print("-------- CREATING COMMENTS")
+
+    for issue_json in issue_jsons:
+        for note_json in issue_json['notes']:
+            system_action = note_json.get('system_note_metadata', {}).get('action', None)
+
+            body = note_json['note']
+
+            # The "Removed" part is a guess here, don't know if that actually shows up.
+            if LABELS is not None and (
+                    system_action == 'label' or re.search(r'^(Added|Removed) ~[0-9]+ label', body)
+            ):
+                def expand_label(ref):
+                    ref_num = int(ref.group(1))
+                    assert ref_num in LABELS, \
+                        f"Unknown label #{ref_num}, please add to LABELS."
+                    return LABELS[ref_num]
+
+                body = re.sub(r'~([0-9]+)', expand_label, body)
+
+            if system_action == 'milestone' or re.search(r'^Milestone changed to %[0-9]+$', body):
+                def expand_milestone(ref):
+                    ref_num = int(ref.group(1))
+                    assert ref_num in milestone_ids_to_titles, \
+                        f"Unknown milestone #{ref_num}."
+                    return milestone_ids_to_titles[ref_num]
+
+                body = re.sub(r'%([0-9]+)', expand_milestone, body)
+
+            send_comment(
+                smtp=smtp,
+                smtp_delay=smtp_delay,
+                mode=mode,
+                srht_owner=srht_owner,
+                srht_tracker=srht_tracker,
+                frm=frm,
+                issue_id=issue_id_map[issue_json['iid']],
+                body=body,
+                author_name=note_json['author']['name'],
+                created_at=note_json['created_at'],
+                last_edited_at=note_json['last_edited_at'],
+                is_system=note_json['system'],
+            )
+
+    print("-------- CLOSING CLOSED ISSUES")
+
+    for issue_json in issue_jsons:
+        if issue_json['state'] == 'closed':
+            close_ticket(
+                smtp=smtp,
+                smtp_delay=smtp_delay,
+                mode=mode,
+                srht_owner=srht_owner,
+                srht_tracker=srht_tracker,
+                frm=frm,
+                issue_id=issue_id_map[issue_json['iid']],
+                closed_at=issue_json['closed_at'],
+                is_closed=(issue_json['state'] == 'closed'),
+            )
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        prog='import_issues.py',
+        description='Import Gitlab issues into Sourcehut via SMTP.',
+    )
+
+    parser.add_argument(
+        '--srht-owner',
+        required=True,
+        help='Owner of the Sorucehut tracker.',
+    )
+
+    parser.add_argument(
+        '--srht-tracker',
+        required=True,
+        help='Name of Sourcehut tracker to submit to.',
+    )
+
+    parser.add_argument(
+        '--gitlab-project-url',
+        required=True,
+        help="The base URL the project on Gitlab.",
+    )
+
+    parser.add_argument(
+        '--mode',
+        default='print',
+        help="Action to take, 'print' or 'send'.",
+    )
+
+    parser.add_argument(
+        '--from',
+        help="From address if mode is 'send'.",
+    )
+
+    parser.add_argument(
+        '--smtp-host',
+        help="SMTP host to use.",
+    )
+
+    parser.add_argument(
+        '--smtp-port',
+        default=None,
+        help="SMTP port to use.",
+    )
+
+    parser.add_argument(
+        '--smtp-ssl',
+        action='store_true',
+        help="Use SMTP over SSL.",
+    )
+
+    parser.add_argument(
+        '--smtp-user',
+        help="SMTP username.",
+    )
+
+    parser.add_argument(
+        '--smtp-password',
+        help="SMTP password.",
+    )
+
+    parser.add_argument(
+        '--smtp-delay',
+        default=5,
+        help="Decimal number of seconds to wait after sending each email.",
+    )
+
+    parser.add_argument(
+        '--allow-missing-issues',
+        action='store_true',
+        help="Don't abort if there are missing issue IDs in the export.",
+    )
+
+    parser.add_argument(
+        'export_dir',
+        help='Exported Gitlab tree/project/ directory containing ndjson files.',
+    )
+
+    args = vars(parser.parse_args())
+
+    export_dir = args['export_dir']
+    assert export_dir, f"Must have a exported project directory."
+    export_dir_path = Path(export_dir)
+    assert export_dir_path.is_dir(), \
+        f"Project directory is not a directory: {export_dir_path}"
+
+    mode = args['mode']
+    frm = args['from']
+
+    if mode == 'print':
+        smtp = None
+    elif mode == 'send':
+        smtp_ssl = args['smtp_ssl']
+        smtp_host = args['smtp_host'] or os.environ.get('SMTP_HOST', 'localhost')
+        smtp_port = args['smtp_port'] or os.environ.get('SMTP_PORT', 465 if smtp_ssl else 25)
+        smtp_user = args['smtp_user'] or os.environ.get('SMTP_USER', None)
+        smtp_password = args['smtp_password'] or os.environ.get('SMTP_PASSWORD', None)
+
+        assert smtp_user, f"No SMTP user given."
+        assert smtp_password, f"No SMTP password given."
+
+        print(f"Connecting to {smtp_host}:{smtp_port}, user {smtp_user!r}.")
+
+        if smtp_ssl:
+            smtp = smtplib.SMTP_SSL(host=smtp_host, port=smtp_port)
+        else:
+            smtp = smtplib.SMTP(host=smtp_host, port=smtp_port)
+
+        # If SMTP isn't working: smtp.set_debuglevel(2)
+
+        if smtp_user:
+            smtp.login(smtp_user, smtp_password)
+
+    run(
+        smtp=smtp,
+        smtp_delay=float(args['smtp_delay']),
+        mode=mode,
+        srht_owner=args['srht_owner'],
+        srht_tracker=args['srht_tracker'],
+        frm=frm,
+        export_dir_path=export_dir_path,
+        gitlab_project_url=args['gitlab_project_url'].rstrip('/'),
+        allow_missing_issues=args['allow_missing_issues'],
+    )
+
+    if mode == 'send':
+        smtp.quit()
+
+
+if __name__ == '__main__':
+    main()