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# sb-builder - Jobs tab
# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""Jobs tab: job list, live log through job-follow, start and kill."""
import codecs
import re
from PyQt6.QtCore import Qt, pyqtSignal
from PyQt6.QtGui import QFontDatabase, QTextCursor
from PyQt6.QtWidgets import (QHBoxLayout, QListWidget, QListWidgetItem, QMenu,
QMessageBox, QPlainTextEdit, QPushButton, QSplitter,
QToolButton, QVBoxLayout, QWidget)
from .fmt import describe
ANSI = re.compile(rb"\x1b\[[0-9;?]*[A-Za-z]")
SHADOW_PLAN = re.compile(r"^(un)?shadow: ", re.M)
ACTIVE = ("starting", "running")
BAD = ("failed", "killed", "lost")
class JobsTab(QWidget):
refresh_requested = pyqtSignal()
def __init__(self, remote, parent=None):
super().__init__(parent)
self.remote = remote
self.jobs = {}
self.current = None
self.offset = 0
self.proc = None
self.decoder = codecs.getincrementaldecoder("utf-8")(errors="replace")
self.start_menu = QMenu(self)
start = QToolButton(text="Start", popupMode=QToolButton.ToolButtonPopupMode.InstantPopup)
start.setMenu(self.start_menu)
self.apply_btn = QPushButton("Apply shadowing")
self.apply_btn.clicked.connect(lambda: self.confirm_start(
"Apply the shadowing plan to the repo (sbshadow --yes)?", "sbshadow", "--yes"))
self.apply_btn.hide()
self.kill_btn = QPushButton("Kill")
self.kill_btn.clicked.connect(self.kill)
bar = QHBoxLayout()
for w in (start, self.apply_btn):
bar.addWidget(w)
bar.addStretch()
bar.addWidget(self.kill_btn)
self.list = QListWidget()
self.list.currentItemChanged.connect(self._on_select)
self.log = QPlainTextEdit(readOnly=True)
self.log.setFont(QFontDatabase.systemFont(QFontDatabase.SystemFont.FixedFont))
self.log.setMaximumBlockCount(50000) # ponytail: older lines drop off; the full log stays on the VM
split = QSplitter()
split.addWidget(self.list)
split.addWidget(self.log)
split.setSizes([300, 700])
layout = QVBoxLayout(self)
layout.addLayout(bar)
layout.addWidget(split)
self.set_overlays([])
def set_overlays(self, overlays):
m = self.start_menu
m.clear()
for o in overlays:
m.addAction(f"sbpull {o} (preview)", lambda o=o: self.start("sbpull", o, "--no"))
m.addSeparator()
m.addAction("sbshadow (preview)", lambda: self.start("sbshadow", "--no"))
m.addAction("sbshadow (apply)…", lambda: self.confirm_start(
"Run sbshadow --yes on the repo?", "sbshadow", "--yes"))
def set_jobs(self, jobs):
self.jobs = {j["id"]: j for j in jobs}
self.list.blockSignals(True)
self.list.clear()
for j in jobs:
item = QListWidgetItem(describe(j))
item.setData(Qt.ItemDataRole.UserRole, j["id"])
if j["status"] in BAD:
item.setForeground(Qt.GlobalColor.red)
self.list.addItem(item)
if j["id"] == self.current:
self.list.setCurrentItem(item)
self.list.blockSignals(False)
j = self.jobs.get(self.current)
if j and j["status"] in ACTIVE and self.proc is None:
self._follow() # stream dropped while the job kept running: resume at offset
self._update_buttons()
def select(self, jid):
for i in range(self.list.count()):
if self.list.item(i).data(Qt.ItemDataRole.UserRole) == jid:
self.list.setCurrentItem(self.list.item(i))
return
self._show(jid) # not listed yet: just started
def append_log(self, text):
cur = self.log.textCursor()
cur.movePosition(QTextCursor.MoveOperation.End)
# ponytail: a \r split across two chunks is printed as-is
for i, part in enumerate(text.replace("\r\n", "\n").split("\r")):
if i: # carriage return: the next text replaces the current line
cur.movePosition(QTextCursor.MoveOperation.StartOfBlock,
QTextCursor.MoveMode.KeepAnchor)
cur.removeSelectedText()
cur.insertText(part)
self.log.setTextCursor(cur)
def stop(self):
if self.proc:
p, self.proc = self.proc, None
p.kill()
def start(self, *args):
self.remote.call(self._started, "job-start", *args)
def confirm_start(self, question, *args):
if QMessageBox.question(self, "Confirm", question) == QMessageBox.StandardButton.Yes:
self.start(*args)
def kill(self):
if QMessageBox.question(self, "Kill job", f"Send SIGTERM to {self.current}?") \
== QMessageBox.StandardButton.Yes:
self.remote.call(lambda _d, err: err and QMessageBox.warning(self, "Kill failed", err),
"job-kill", self.current)
def _started(self, data, err):
if err:
QMessageBox.warning(self, "Start failed", err)
return
if "busy" in data:
box = QMessageBox(QMessageBox.Icon.Information, "Busy",
f"busy: {data['busy']}", parent=self)
show = box.addButton("Show job", QMessageBox.ButtonRole.AcceptRole)
box.addButton(QMessageBox.StandardButton.Close)
box.exec()
if box.clickedButton() is show and data["busy"]:
self.select(data["busy"])
return
self.select(data["id"])
self.refresh_requested.emit()
def _on_select(self, item, _prev):
jid = item.data(Qt.ItemDataRole.UserRole) if item else None
if jid != self.current:
self._show(jid)
def _show(self, jid):
self.stop()
self.current, self.offset = jid, 0
self.decoder.reset()
self.log.clear()
if jid:
self._follow()
self._update_buttons()
def _follow(self):
jid = self.current
p = self.proc = self.remote.follow(jid, self.offset)
p.readyReadStandardOutput.connect(lambda: self._chunk(p, jid))
p.finished.connect(lambda *_: self._ended(p))
def _chunk(self, p, jid):
data = bytes(p.readAllStandardOutput())
if jid != self.current:
return
self.offset += len(data)
self.append_log(self.decoder.decode(ANSI.sub(b"", data)))
def _ended(self, p):
if p is self.proc:
self.proc = None
p.deleteLater()
self._update_buttons()
def _update_buttons(self):
j = self.jobs.get(self.current)
self.kill_btn.setEnabled(bool(j) and j["status"] == "running")
self.apply_btn.setVisible(
bool(j) and j["status"] == "ok" and "--no" in j["args"]
and bool(SHADOW_PLAN.search(self.log.toPlainText())))
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