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/*
* shellprocess.cpp - execute a shell process
* Program: kalarm
* Copyright (c) 2004, 2005 by David Jarvie <software@astrojar.org.uk>
*
* 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.
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <sys/stat.h>
#include <kapplication.h>
#include <klocale.h>
#include <kdebug.h>
#include "shellprocess.moc"
TQCString ShellProcess::mShellName;
TQCString ShellProcess::mShellPath;
bool ShellProcess::mInitialised = false;
bool ShellProcess::mAuthorised = false;
ShellProcess::ShellProcess(const TQString& command)
: KShellProcess(shellName()),
mCommand(command),
mStatus(INACTIVE),
mStdinExit(false)
{
}
/******************************************************************************
* Execute a command.
*/
bool ShellProcess::start(Communication comm)
{
if (!authorised())
{
mStatus = UNAUTHORISED;
return false;
}
KShellProcess::operator<<(mCommand);
connect(this, TQT_SIGNAL(wroteStdin(KProcess*)), TQT_SLOT(writtenStdin(KProcess*)));
connect(this, TQT_SIGNAL(processExited(KProcess*)), TQT_SLOT(slotExited(KProcess*)));
if (!KShellProcess::start(KProcess::NotifyOnExit, comm))
{
mStatus = START_FAIL;
return false;
}
mStatus = RUNNING;
return true;
}
/******************************************************************************
* Called when a shell process execution completes.
* Interprets the exit status according to which shell was called, and emits
* a shellExited() signal.
*/
void ShellProcess::slotExited(KProcess* proc)
{
kdDebug(5950) << "ShellProcess::slotExited()\n";
mStdinQueue.clear();
mStatus = SUCCESS;
if (!proc->normalExit())
{
kdWarning(5950) << "ShellProcess::slotExited(" << mCommand << ") " << mShellName << ": died/killed\n";
mStatus = DIED;
}
else
{
// Some shells report if the command couldn't be found, or is not executable
int status = proc->exitStatus();
if (mShellName == "bash" && (status == 126 || status == 127)
|| mShellName == "ksh" && status == 127)
{
kdWarning(5950) << "ShellProcess::slotExited(" << mCommand << ") " << mShellName << ": not found or not executable\n";
mStatus = NOT_FOUND;
}
}
emit shellExited(this);
}
/******************************************************************************
* Write a string to STDIN.
*/
void ShellProcess::writeStdin(const char* buffer, int bufflen)
{
TQCString scopy(buffer, bufflen+1); // construct a deep copy
bool write = mStdinQueue.isEmpty();
mStdinQueue.append(scopy);
if (write)
KProcess::writeStdin(mStdinQueue.first(), mStdinQueue.first().length());
}
/******************************************************************************
* Called when output to STDIN completes.
* Send the next queued output, if any.
* Note that buffers written to STDIN must not be freed until the writtenStdin()
* signal has been processed.
*/
void ShellProcess::writtenStdin(KProcess* proc)
{
mStdinQueue.pop_front(); // free the buffer which has now been written
if (!mStdinQueue.isEmpty())
proc->writeStdin(mStdinQueue.first(), mStdinQueue.first().length());
else if (mStdinExit)
kill();
}
/******************************************************************************
* Tell the process to exit once all STDIN strings have been written.
*/
void ShellProcess::stdinExit()
{
if (mStdinQueue.isEmpty())
kill();
else
mStdinExit = true;
}
/******************************************************************************
* Return the error message corresponding to the command exit status.
* Reply = null string if not yet exited, or if command successful.
*/
TQString ShellProcess::errorMessage() const
{
switch (mStatus)
{
case UNAUTHORISED:
return i18n("Failed to execute command (shell access not authorized):");
case START_FAIL:
case NOT_FOUND:
return i18n("Failed to execute command:");
case DIED:
return i18n("Command execution error:");
case INACTIVE:
case RUNNING:
case SUCCESS:
default:
return TQString::null;
}
}
/******************************************************************************
* Determine which shell to use.
* This is a duplication of what KShellProcess does, but we need to know
* which shell is used in order to decide what its exit code means.
*/
const TQCString& ShellProcess::shellPath()
{
if (mShellPath.isEmpty())
{
// Get the path to the shell
mShellPath = "/bin/sh";
TQCString envshell = TQCString(getenv("SHELL")).stripWhiteSpace();
if (!envshell.isEmpty())
{
struct stat fileinfo;
if (stat(envshell.data(), &fileinfo) != -1 // ensure file exists
&& !S_ISDIR(fileinfo.st_mode) // and it's not a directory
&& !S_ISCHR(fileinfo.st_mode) // and it's not a character device
&& !S_ISBLK(fileinfo.st_mode) // and it's not a block device
#ifdef S_ISSOCK
&& !S_ISSOCK(fileinfo.st_mode) // and it's not a socket
#endif
&& !S_ISFIFO(fileinfo.st_mode) // and it's not a fifo
&& !access(envshell.data(), X_OK)) // and it's executable
mShellPath = envshell;
}
// Get the shell filename with the path stripped off
int i = mShellPath.findRev('/');
if (i >= 0)
mShellName = mShellPath.mid(i + 1);
else
mShellName = mShellPath;
}
return mShellPath;
}
/******************************************************************************
* Check whether shell commands are allowed at all.
*/
bool ShellProcess::authorised()
{
if (!mInitialised)
{
mAuthorised = kapp->authorize("shell_access");
mInitialised = true;
}
return mAuthorised;
}
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