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// Copyright © 2015 Alexandre Detiste <alexandre@detiste.be>
// SPDX-License-Identifier: GPL-2.0-or-later
#include <cstring>
#include <iostream>
#include <algorithm>
#include <dirent.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include "explain.h"
#include "usr_merge.h"
#include "owner.h"
static void read_one_explain(const string& script, const string& package, vector<owner>& explain)
{
int fd[2];
if (pipe(fd) != 0) {
perror("pipe");
exit(1);
}
if(!fork()) // child
{
dup2(fd[1], STDOUT_FILENO);
close(fd[0]);
close(fd[1]);
execl(script.c_str(), script.c_str(), static_cast<char*>(nullptr));
cerr << "Failed to execute command '" << script.c_str() << "': " << strerror(errno) << endl;
exit(1);
}
close(fd[1]);
FILE* fp;
fp=fdopen(fd[0], "r");
char buf[4096];
string filter;
string real_package = package;
while (fgets(buf, sizeof(buf),fp))
{
filter=buf;
filter=filter.substr(0,filter.size() - 1); // remove '/n'
if (filter.front() == '/') {
explain.emplace_back(real_package, usr_merge(filter));
} else {
real_package = filter;
}
}
fclose(fp);
}
static void read_uppercase(vector<owner>& explain, const string& directory, bool debug)
{
DIR *dp;
struct dirent *dirp;
if (debug) cerr << "EXECUTING UPPERCASE FILTERS IN " << directory << endl;
if((dp = opendir(directory.c_str())) == nullptr) {
cerr << "Failed to open directory " << directory << ": " << strerror(errno) << endl;
return;
}
while ((dirp = readdir(dp)) != nullptr) {
string package = dirp->d_name;
if (package==".") continue;
if (package=="..") continue;
if (!any_of(package.begin(), package.end(), [] (unsigned char c) { return islower(c); }))
read_one_explain(directory + package, package, explain);
}
closedir(dp);
if (debug) cerr << endl;
}
int read_explain(const string& dir, const vector<string>& packages, vector<owner>& explain)
{
bool debug=getenv("DEBUG") != nullptr;
read_uppercase(explain, "/usr/libexec/cruft/", debug);
read_uppercase(explain, dir, debug);
if (debug) cerr << "EXECUTING OTHER FILTERS" << endl;
for (const auto& package: packages) {
struct stat stat_buffer;
string etc_filename = dir + package;
string usr_filename = "/usr/libexec/cruft/" + package;
if ( stat(etc_filename.c_str(), &stat_buffer)==0 )
read_one_explain(etc_filename, package, explain);
else if ( stat(usr_filename.c_str(), &stat_buffer)==0 )
read_one_explain(usr_filename, package, explain);
}
sort(explain.begin(), explain.end());
explain.erase( unique( explain.begin(), explain.end() ), explain.end() );
return 0;
}
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