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Tell a second person who has a project open, and open it read-only

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Two people opening the same project on a shared drive could both edit it,
and the last save silently wiped the other's work. A project now has a
hidden lock file beside it (.~plant.qetz.lock, small JSON: user, host,
process, version, since, heartbeat). Opening a project another live session
holds shows who has it, since when and how long ago they were last active,
and offers Open read-only (default), Open anyway, or Cancel.

- The lock is made with an exclusive create, refreshed every minute and
  deleted when the project closes. It is not a QLockFile: that treats any
  lock from another machine as stale after 30 s. Here only a lock made on
  this machine by a process that no longer exists is taken silently.
- A folder the lock cannot be made in, or the setting turned off
  (Settings > General > Projects), opens as before.
- Save As and .qet saved as .qetz move the lock to the new file, and refuse
  a file someone else has open. A project opened read-only for another's
  lock does not save over that file.
- --resave and --set-titleblock refuse a file someone has open unless given
  --ignore-lock; the read-only verbs never look at locks and headless runs
  never take one. A script's qet.save() refuses the same way.

Checked: 17 new unit tests (5 go red when stale detection and the exclusive
create are broken), full ctest 107/107, the dialog and both choices in the
GUI under Xvfb, and --resave refused/allowed from the command line.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
ispyisail
2026-10-16 13:01:54 +13:00
parent c4b5cf2f11
commit 3521c64ba3
17 changed files with 1012 additions and 0 deletions
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sources/ui/configpage/generalconfigurationpage.cpp
+2
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@@ -190,6 +190,7 @@ GeneralConfigurationPage::GeneralConfigurationPage(QWidget *parent) :
ui->m_use_folio_label->setChecked(settings.value("genericpanel/folio", true).toBool());
ui->m_border_0->setChecked(settings.value("border-columns_0", false).toBool());
ui->m_autosave_sb->setValue(settings.value("diagrameditor/autosave-interval", 0).toInt());
ui->m_project_lock->setChecked(settings.value("projectlock/enabled", true).toBool());
QString fontInfos = settings.value("diagramitemfont", "Liberation Sans").toString() + " " +
settings.value("diagramitemsize", "9").toString() + " (" +
@@ -417,6 +418,7 @@ void GeneralConfigurationPage::applyConf()
}
}
settings.setValue("diagrameditor/autosave-interval", ui->m_autosave_sb->value());
settings.setValue("projectlock/enabled", ui->m_project_lock->isChecked());
settings.setValue("diagrameditor/grid_display_startup", ui->grid_startup_cb->isChecked());
settings.setValue("diagrameditor/guides_display_startup", ui->guides_startup_cb->isChecked());