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/* Copyright (C) 2004-2021 J.F.Dockes
* 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.
*/
#include "autoconfig.h"
#include <stdio.h>
#include "ecrontab.h"
#include "execmd.h"
#include "smallut.h"
#include "log.h"
using std::string;
using std::vector;
// Read crontab file and split it into lines.
static bool eCrontabGetLines(vector<string>& lines)
{
string crontab;
ExecCmd croncmd;
vector<string> args;
int status;
// Retrieve current crontab contents. An error here means that no
// crontab exists, and is not fatal, but we return a different
// status than for an empty one
args.push_back("-l");
if ((status = croncmd.doexec("crontab", args, nullptr, &crontab))) {
lines.clear();
return false;
}
// Split crontab into lines
stringToTokens(crontab, lines, "\n");
return true;
}
// Concatenate lines and write crontab
static bool eCrontabWriteFile(const vector<string>& lines, string& reason)
{
string crontab;
ExecCmd croncmd;
vector<string> args;
int status;
for (const auto& line : lines) {
crontab += line + "\n";
}
args.push_back("-");
if ((status = croncmd.doexec("crontab", args, &crontab, nullptr))) {
char nbuf[30];
snprintf(nbuf, sizeof(nbuf), "0x%x", status);
reason = string("Exec crontab -l failed: status: ") + nbuf;
return false;
}
return true;
}
// Add / change / delete entry identified by marker and id
bool editCrontab(const string& marker, const string& id,
const string& sched, const string& cmd, string& reason)
{
vector<string> lines;
if (!eCrontabGetLines(lines)) {
// Special case: cmd is empty, no crontab, don't create one
if (cmd.empty())
return true;
}
// Remove old copy if any
for (auto it = lines.begin(); it != lines.end(); it++) {
// Skip comment
if (it->find_first_of("#") == it->find_first_not_of(" \t"))
continue;
if (it->find(marker) != string::npos && it->find(id) != string::npos) {
lines.erase(it);
break;
}
}
if (!cmd.empty()) {
string nline = sched + " " + marker + " " + id + " " + cmd;
lines.push_back(nline);
}
if (!eCrontabWriteFile(lines, reason))
return false;
return true;
}
bool checkCrontabUnmanaged(const string& marker, const string& data)
{
vector<string> lines;
if (!eCrontabGetLines(lines)) {
// No crontab, answer is no
return false;
}
// Scan crontab
for (const auto& line : lines) {
if (line.find(marker) == string::npos &&
line.find(data) != string::npos) {
return true;
}
}
return false;
}
/** Retrieve the scheduling for a crontab entry */
bool getCrontabSched(const string& marker, const string& id,
vector<string>& sched)
{
LOGDEB0("getCrontabSched: marker[" << marker << "], id[" << id << "]\n");
vector<string> lines;
if (!eCrontabGetLines(lines)) {
// No crontab, answer is no
sched.clear();
return false;
}
string theline;
for (const auto& line : lines) {
// Skip comment
if (line.find_first_of("#") == line.find_first_not_of(" \t"))
continue;
if (line.find(marker) != string::npos &&
line.find(id) != string::npos) {
theline = line;
break;
}
}
stringToTokens(theline, sched);
sched.resize(5);
return true;
}
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