annotate src/hgrunner.cpp @ 571:012ba1b83328

Show cancel button with progress bar only when running an operation that it makes sense to cancel (we don't really want people cancelling e.g. initial folder scan because it would leave things in an inconsistent state)

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    EasyMercurial

    Based on HgExplorer by Jari Korhonen
    Copyright (c) 2010 Jari Korhonen
    Copyright (c) 2012 Chris Cannam
    Copyright (c) 2012 Queen Mary, University of London
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "hgrunner.h"
#include "common.h"
#include "debug.h"
#include "settingsdialog.h"

#include <QSettings>
#include <QInputDialog>
#include <QDesktopServices>
#include <QTemporaryFile>
#include <QDir>
#include <QProgressBar>
#include <QPushButton>
#include <QGridLayout>

#include <iostream>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>

#ifndef Q_OS_WIN32
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#else
#include <process.h>
#endif

HgRunner::HgRunner(QString myDirPath, QWidget *parent) :
    QWidget(parent),
    m_myDirPath(myDirPath)
{
    QGridLayout *layout = new QGridLayout(this);
    layout->setMargin(0);

    m_progress = new QProgressBar;
    layout->addWidget(m_progress, 0, 0);

    m_cancel = new QPushButton;
    m_cancel->setIcon(QIcon(":images/cancel-small.png"));
    m_cancel->setFlat(true);
    m_cancel->setFixedHeight(m_progress->sizeHint().height());
    m_cancel->setFixedWidth(m_progress->sizeHint().height());
    connect(m_cancel, SIGNAL(clicked()), this, SLOT(killCurrentActions()));
    layout->addWidget(m_cancel, 0, 1);

    m_proc = 0;

    // Always unbundle the extension: even if it already exists (in
    // case we're upgrading) and even if we're not going to use it (so
    // that it's available in case someone wants to use it later,
    // e.g. to fix a malfunctioning setup).  But the path we actually
    // prefer is the one in the settings first, if it exists; then the
    // unbundled one; then anything in the path if for some reason
    // unbundling failed
    unbundleExtension();

    m_progress->setTextVisible(false);
    hide();
    m_isRunning = false;
}

HgRunner::~HgRunner()
{
    closeTerminal();
    if (m_proc) {
        m_proc->kill();
        m_proc->deleteLater();
    }
    if (m_authFilePath != "") {
        QFile(m_authFilePath).remove();
    }
    //!!! and remove any other misc auth file paths...
}

QString HgRunner::getUnbundledFileName()
{
    return SettingsDialog::getUnbundledExtensionFileName();
}

QString HgRunner::unbundleExtension()
{
    // Pull out the bundled Python file into a temporary file, and
    // copy it to our known extension location, replacing the magic
    // text NO_EASYHG_IMPORT_PATH with our installation location

    QString bundled = ":easyhg.py";
    QString unbundled = getUnbundledFileName();

    QString target = QFileInfo(unbundled).path();
    if (!QDir().mkpath(target)) {
        DEBUG << "Failed to make unbundle path " << target << endl;
        std::cerr << "Failed to make unbundle path " << target << std::endl;
        return ""; 
    }

    QFile bf(bundled);
    DEBUG << "unbundle: bundled file will be " << bundled << endl;
    if (!bf.exists() || !bf.open(QIODevice::ReadOnly)) {
        DEBUG << "Bundled extension is missing!" << endl;
        return "";
    }

    QTemporaryFile tmpfile(QString("%1/easyhg.py.XXXXXX").arg(target));
    tmpfile.setAutoRemove(false);
    DEBUG << "unbundle: temp file will be " << tmpfile.fileName() << endl;
    if (!tmpfile.open()) {
        DEBUG << "Failed to open temporary file " << tmpfile.fileName() << endl;
        std::cerr << "Failed to open temporary file " << tmpfile.fileName() << std::endl;
        return "";
    }

    QString all = QString::fromUtf8(bf.readAll());
    all.replace("NO_EASYHG_IMPORT_PATH", m_myDirPath);
    tmpfile.write(all.toUtf8());
    DEBUG << "unbundle: wrote " << all.length() << " characters" << endl;

    tmpfile.close();

    QFile ef(unbundled);
    if (ef.exists()) {
        DEBUG << "unbundle: removing old file " << unbundled << endl;
        ef.remove();
    }
    DEBUG << "unbundle: renaming " << tmpfile.fileName() << " to " << unbundled << endl;
    if (!tmpfile.rename(unbundled)) {
        DEBUG << "Failed to move temporary file to target file " << unbundled << endl;
        std::cerr << "Failed to move temporary file to target file " << unbundled << std::endl;
        return "";
    }
    
    DEBUG << "Unbundled extension to " << unbundled << endl;
    return unbundled;
}        

void HgRunner::requestAction(HgAction action)
{
    DEBUG << "requestAction " << action.action << endl;
    bool pushIt = true;
    if (m_queue.empty()) {
        if (action == m_currentAction) {
            // this request is identical to the thing we're executing
            DEBUG << "requestAction: we're already handling this one, ignoring identical request" << endl;
            pushIt = false;
        }
    } else {
        HgAction last = m_queue.back();
        if (action == last) {
            // this request is identical to the previous thing we
            // queued which we haven't executed yet
            DEBUG << "requestAction: we're already queueing this one, ignoring identical request" << endl;
            pushIt = false;
        }
    }
    if (pushIt) m_queue.push_back(action);
    checkQueue();
}

QString HgRunner::getHgBinaryName()
{
    QSettings settings;
    settings.beginGroup("Locations");
    return settings.value("hgbinary", "").toString();
}

QString HgRunner::getSshBinaryName()
{
    QSettings settings;
    settings.beginGroup("Locations");
    return settings.value("sshbinary", "").toString();
}

QString HgRunner::getExtensionLocation()
{
    QSettings settings;
    settings.beginGroup("Locations");
    QString extpath = settings.value("extensionpath", "").toString();
    if (extpath != "" && QFile(extpath).exists()) return extpath;
    return "";
}   

void HgRunner::started()
{
    DEBUG << "started" << endl;
    /*
    m_proc->write("blah\n");
    m_proc->write("blah\n");
    m_proc -> closeWriteChannel();
    */
}

void HgRunner::noteUsername(QString name)
{
    m_userName = name;
}

void HgRunner::noteRealm(QString realm)
{
    m_realm = realm;
}

void HgRunner::getUsername()
{
    if (m_ptyFile) {
        bool ok = false;
        QString prompt = tr("User name:");
        if (m_realm != "") {
            prompt = tr("User name for \"%1\":").arg(m_realm);
        }
        QString pwd = QInputDialog::getText
            (qobject_cast<QWidget *>(parent()),
            tr("Enter user name"), prompt,
            QLineEdit::Normal, QString(), &ok);
        if (ok) {
            m_ptyFile->write(QString("%1\n").arg(pwd).toUtf8());
            m_ptyFile->flush();
            return;
        } else {
            DEBUG << "HgRunner::getUsername: user cancelled" << endl;
            killCurrentCommand();
            return;
        }
    }
    // user cancelled or something went wrong
    DEBUG << "HgRunner::getUsername: something went wrong" << endl;
    killCurrentCommand();
}

void HgRunner::getPassword()
{
    if (m_ptyFile) {
        bool ok = false;
        QString prompt = tr("Password:");
        if (m_userName != "") {
            if (m_realm != "") {
                prompt = tr("Password for \"%1\" at \"%2\":")
                         .arg(m_userName).arg(m_realm);
            } else {
                prompt = tr("Password for user \"%1\":")
                         .arg(m_userName);
            }
        }
        QString pwd = QInputDialog::getText
            (qobject_cast<QWidget *>(parent()),
            tr("Enter password"), prompt,
             QLineEdit::Password, QString(), &ok);
        if (ok) {
            m_ptyFile->write(QString("%1\n").arg(pwd).toUtf8());
            m_ptyFile->flush();
            return;
        } else {
            DEBUG << "HgRunner::getPassword: user cancelled" << endl;
            killCurrentCommand();
            return;
        }
    }
    // user cancelled or something went wrong
    DEBUG << "HgRunner::getPassword: something went wrong" << endl;
    killCurrentCommand();
}

bool HgRunner::checkPrompts(QString chunk)
{
    //DEBUG << "checkPrompts: " << chunk << endl;

    if (!m_currentAction.mayBeInteractive()) return false;

    QString text = chunk.trimmed();
    QString lower = text.toLower();
    if (lower.endsWith("password:")) {
        getPassword();
        return true;
    }
    if (lower.endsWith("user:") || lower.endsWith("username:")) {
        getUsername();
        return true;
    }
    QRegExp userRe("\\buser(name)?:\\s*([^\\s]+)");
    if (userRe.indexIn(text) >= 0) {
        noteUsername(userRe.cap(2));
    }
    QRegExp realmRe("\\brealmr:\\s*([^\\s]+)");
    if (realmRe.indexIn(text) >= 0) {
        noteRealm(realmRe.cap(1));
    }
    return false;
}

void HgRunner::dataReadyStdout()
{
    DEBUG << "dataReadyStdout" << endl;
    if (!m_proc) return;
    QString chunk = QString::fromUtf8(m_proc->readAllStandardOutput());
    if (!checkPrompts(chunk)) {
        m_stdout += chunk;
    }
}

void HgRunner::dataReadyStderr()
{
    DEBUG << "dataReadyStderr" << endl;
    if (!m_proc) return;
    QString chunk = QString::fromUtf8(m_proc->readAllStandardError());
    DEBUG << chunk;
    if (!checkPrompts(chunk)) {
        m_stderr += chunk;
    }
}

void HgRunner::dataReadyPty()
{
    DEBUG << "dataReadyPty" << endl;
    QString chunk = QString::fromUtf8(m_ptyFile->readAll());
    DEBUG << "chunk of " << chunk.length() << " chars" << endl;
    if (!checkPrompts(chunk)) {
        m_stdout += chunk;
    }
}

void HgRunner::error(QProcess::ProcessError)
{
    finished(-1, QProcess::CrashExit);
}

void HgRunner::finished(int procExitCode, QProcess::ExitStatus procExitStatus)
{
    if (!m_proc) return;

    // Save the current action and reset m_currentAction before we
    // emit a signal to mark the completion; otherwise we may be
    // resetting the action after a slot has already tried to set it
    // to something else to start a new action

    HgAction completedAction = m_currentAction;

    m_isRunning = false;
    m_currentAction = HgAction();

    //closeProcInput();
    m_proc->deleteLater();
    m_proc = 0;

    if (completedAction.action == ACT_NONE) {
        DEBUG << "HgRunner::finished: WARNING: completed action is ACT_NONE" << endl;
    } else {
        if (procExitCode == 0 && procExitStatus == QProcess::NormalExit) {
            DEBUG << "HgRunner::finished: Command completed successfully"
                  << endl;
//            DEBUG << "stdout is " << m_stdout << endl;
            emit commandCompleted(completedAction, m_stdout);
        } else {
            DEBUG << "HgRunner::finished: Command failed, exit code "
                  << procExitCode << ", exit status " << procExitStatus
                  << ", stderr follows" << endl;
            DEBUG << m_stderr << endl;
            emit commandFailed(completedAction, m_stderr, m_stdout);
        }
    }

    checkQueue();
}

void HgRunner::killCurrentActions()
{
    HgAction current = m_currentAction;
    m_queue.clear();
    killCurrentCommand();
    emit commandCancelled(current);
}

void HgRunner::killCurrentCommand()
{
    if (m_isRunning) {
        m_currentAction.action = ACT_NONE; // so that we don't bother to notify
        if (m_proc) m_proc->kill();
    }
}

void HgRunner::checkQueue()
{
    if (m_isRunning) {
        return;
    }
    if (m_queue.empty()) {
        hide();
        return;
    }
    HgAction toRun = m_queue.front();
    m_queue.pop_front();
    DEBUG << "checkQueue: have action: running " << toRun.action << endl;
    startCommand(toRun);
}

void HgRunner::pruneOldAuthFiles()
{
    QString path = QDesktopServices::storageLocation
        (QDesktopServices::CacheLocation);
    QDir d(path);
    if (!d.exists()) return;
    QStringList filters;
    filters << "easyhg.*.dat";
    QStringList fl = d.entryList(filters);
    foreach (QString f, fl) {
        QStringList parts = f.split('.');
        if (parts.size() > 1) {
            int pid = parts[1].toInt();
            DEBUG << "Checking pid " << pid << " for cache file " << f << endl;

            ProcessStatus ps = GetProcessStatus(pid);
            if (ps == ProcessNotRunning) {
                DEBUG << "Removing stale cache file " << f << endl;
                QDir(d).remove(f);
            }
        }
    }
}

QString HgRunner::getAuthFilePath()
{
    if (m_authFilePath == "") {

        pruneOldAuthFiles();

        QByteArray fileExt = randomKey();
        if (fileExt == QByteArray()) {
            DEBUG << "HgRunner::addExtensionOptions: Failed to get proper auth file ext" << endl;
            return "";
        }
        QString fileExt16 = QString::fromLocal8Bit(fileExt.toBase64()).left(16)
            .replace('+', '-').replace('/', '_');
        QString path = QDesktopServices::storageLocation
            (QDesktopServices::CacheLocation);
        QDir().mkpath(path);
        if (path == "") {
            DEBUG << "HgRunner::addExtensionOptions: Failed to get cache location" << endl;
            return "";
        }

        m_authFilePath = QString("%1/easyhg.%2.%3.dat").arg(path)
            .arg(getpid()).arg(fileExt16);
    }

    return m_authFilePath;
}

QString HgRunner::getAuthKey()
{
    if (m_authKey == "") {
        QByteArray key = randomKey();
        if (key == QByteArray()) {
            DEBUG << "HgRunner::addExtensionOptions: Failed to get proper auth key" << endl;
            return "";
        }
        QString key16 = QString::fromLocal8Bit(key.toBase64()).left(16);
        m_authKey = key16;
    }

    return m_authKey;
}

QStringList HgRunner::addExtensionOptions(QStringList params)
{
    QString extpath = getExtensionLocation();
    if (extpath == "") {
        DEBUG << "HgRunner::addExtensionOptions: Failed to get extension location" << endl;
        return params;
    }

    QString afp = getAuthFilePath();
    QString afk = getAuthKey();

    if (afp != "" && afk != "") {
        params.push_front(QString("easyhg.authkey=%1").arg(m_authKey));
        params.push_front("--config");
        params.push_front(QString("easyhg.authfile=%1").arg(m_authFilePath));
        params.push_front("--config");
    }

    // Looks like this one must be without quotes, even though the SSH
    // one above only works on Windows if it has quotes (at least where
    // there is a space in the path).  Odd
    params.push_front(QString("extensions.easyhg=%1").arg(extpath));
    params.push_front("--config");

    return params;
}

void HgRunner::startCommand(HgAction action)
{
    QString executable = action.executable;
    bool interactive = false;
    QStringList params = action.params;

    if (action.workingDir.isEmpty()) {
        // We require a working directory, never just operate in pwd
        emit commandFailed(action, "EasyMercurial: No working directory supplied, will not run Mercurial command without one", "");
        return;
    }

    if (executable == "") {
        // This is a Hg command
        executable = getHgBinaryName();
        if (executable == "") executable = "hg";

        QString ssh = getSshBinaryName();
        if (ssh != "") {
            params.push_front(QString("ui.ssh=\"%1\"").arg(ssh));
            params.push_front("--config");
        }

        if (action.mayBeInteractive()) {
            params.push_front("ui.interactive=true");
            params.push_front("--config");
            QSettings settings;
            if (settings.value("useextension", true).toBool()) {
                params = addExtensionOptions(params);
            }
            interactive = true;
        }            

        //!!! want an option to use the mercurial_keyring extension as well
    }

    m_isRunning = true;
    m_progress->setRange(0, 0);
    if (!action.shouldBeFast()) {
        show();
        m_cancel->setVisible(action.makesSenseToCancel());
    }
    m_stdout.clear();
    m_stderr.clear();
    m_realm = "";
    m_userName = "";

    m_proc = new QProcess;

    QProcessEnvironment env = QProcessEnvironment::systemEnvironment();

#ifdef Q_OS_WIN32
    // On Win32 we like to bundle Hg and other executables with EasyHg
    if (m_myDirPath != "") {
        env.insert("PATH", m_myDirPath + ";" + env.value("PATH"));
    }
#endif

#ifdef Q_OS_MAC
    if (QSettings().value("python32", false).toBool()) {
        env.insert("VERSIONER_PYTHON_PREFER_32_BIT", "1");
    }
#endif

    env.insert("LANG", "en_US.utf8");
    env.insert("LC_ALL", "en_US.utf8");
    env.insert("HGENCODING", "utf8");
    env.insert("HGPLAIN", "1");
    m_proc->setProcessEnvironment(env);

    connect(m_proc, SIGNAL(started()), this, SLOT(started()));
    connect(m_proc, SIGNAL(error(QProcess::ProcessError)),
            this, SLOT(error(QProcess::ProcessError)));
    connect(m_proc, SIGNAL(finished(int, QProcess::ExitStatus)),
            this, SLOT(finished(int, QProcess::ExitStatus)));
    connect(m_proc, SIGNAL(readyReadStandardOutput()),
            this, SLOT(dataReadyStdout()));
    connect(m_proc, SIGNAL(readyReadStandardError()),
            this, SLOT(dataReadyStderr()));

    m_proc->setWorkingDirectory(action.workingDir);

    if (interactive) {
        openTerminal();
        if (m_ptySlaveFilename != "") {
            DEBUG << "HgRunner: connecting to pseudoterminal" << endl;
            m_proc->setStandardInputFile(m_ptySlaveFilename);
//            m_proc->setStandardOutputFile(m_ptySlaveFilename);
//            m_proc->setStandardErrorFile(m_ptySlaveFilename);
        }
    }

    QString cmdline = executable;
    foreach (QString param, params) cmdline += " " + param;
    DEBUG << "HgRunner: starting: " << cmdline << " with cwd "
          << action.workingDir << endl;

    m_currentAction = action;

    // fill these out with what we actually ran
    m_currentAction.executable = executable;
    m_currentAction.params = params;

    DEBUG << "set current action to " << m_currentAction.action << endl;
    
    emit commandStarting(action);

    m_proc->start(executable, params);
}

void HgRunner::closeProcInput()
{
    DEBUG << "closeProcInput" << endl;

    if (m_proc) m_proc->closeWriteChannel();
}

void HgRunner::openTerminal()
{
#ifndef Q_OS_WIN32
    if (m_ptySlaveFilename != "") return; // already open
    DEBUG << "HgRunner::openTerminal: trying to open new pty" << endl;
    int master = posix_openpt(O_RDWR | O_NOCTTY);
    if (master < 0) {
        DEBUG << "openpt failed" << endl;
        perror("openpt failed");
        return;
    }
    struct termios t;
    if (tcgetattr(master, &t)) {
        DEBUG << "tcgetattr failed" << endl;
        perror("tcgetattr failed");
    }
    cfmakeraw(&t);
    if (tcsetattr(master, TCSANOW, &t)) {
        DEBUG << "tcsetattr failed" << endl;
        perror("tcsetattr failed");
    }
    if (grantpt(master)) {
        perror("grantpt failed");
    }
    if (unlockpt(master)) {
        perror("unlockpt failed");
    }
    char *slave = ptsname(master);
    if (!slave) {
        perror("ptsname failed");
        ::close(master);
        return;
    }
    m_ptyMasterFd = master;
    m_ptyFile = new QFile();
    connect(m_ptyFile, SIGNAL(readyRead()), this, SLOT(dataReadyPty()));
    if (!m_ptyFile->open(m_ptyMasterFd, QFile::ReadWrite)) {
        DEBUG << "HgRunner::openTerminal: Failed to open QFile on master fd" << endl;
    }
    m_ptySlaveFilename = slave;
    DEBUG << "HgRunner::openTerminal: succeeded, slave is "
          << m_ptySlaveFilename << endl;
#endif
}

void HgRunner::closeTerminal()
{
#ifndef Q_OS_WIN32
    if (m_ptySlaveFilename != "") {
        delete m_ptyFile;
        m_ptyFile = 0;
        ::close(m_ptyMasterFd);
        m_ptySlaveFilename = "";
    }
#endif
}