123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/*
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* Copyright 2019 Attila Szollosi
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*
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* This file is part of postmarketos-android-recovery-installer.
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*
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* postmarketos-android-recovery-installer is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* postmarketos-android-recovery-installer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with postmarketos-android-recovery-installer. If not, see <http:www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <fcntl.h>
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#include <dirent.h>
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void close_FDs()
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{
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unsigned int fd;
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struct dirent* ep;
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DIR* dp = opendir("/proc/self/fd");
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if (dp != NULL) {
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// first two entries are . and ..
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readdir(dp);
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readdir(dp);
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while (ep = readdir(dp))
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if (sscanf(ep->d_name, "%u", &fd) != EOF)
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close(fd);
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closedir(dp);
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} else {
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// try to close all file descriptors by brute-force
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// in case the list of open FDs could not be read
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// from the procfs
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for (fd = 256; fd >= 0; fd--)
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close(fd);
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}
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}
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// Detach the program from the installation script
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void daemonize()
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{
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pid_t pid;
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pid = fork();
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if (pid < 0)
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exit(1);
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if (pid > 0)
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exit(0);
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if (setsid() < 0)
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exit(1);
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pid = fork();
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if (pid < 0)
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exit(1);
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if (pid > 0)
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exit(0);
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umask(0);
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chdir("/");
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close_FDs();
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}
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// Workaround to disable No OS warning in TWRP
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// See: https://gitlab.com/postmarketOS/pmbootstrap/issues/1451
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//
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// Works by setting the variable tw_backup_system_size to a large
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// value, so TWRP's check
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// (tw_backup_system_size < tw_min_system) will result in
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// false.
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//
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// TWRP doesn't allow issuing OpenRecoveryScript commands while
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// the installation is running, so we have to daemonize the
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// process to change the value after the installation script
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// exited.
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int main()
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{
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daemonize();
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int orsin, orsout;
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char command[1024];
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char result[512];
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char* commands[] = {"set tw_backup_system_size 999",
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"set tw_app_prompt 0"};
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sleep(4);
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int i;
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for (i = 0; i < sizeof(commands)/sizeof(char*); i++) {
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if ((orsin = open("/sbin/orsin", O_WRONLY)) == -1)
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return 1;
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strcpy(command, commands[i]);
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write(orsin, command, sizeof(command));
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close(orsin);
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// Have to read FIFO file, because it blocks
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// the thread processing the command
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// (see man 3 mkfifo)
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if ((orsout = open("/sbin/orsout", O_RDONLY)) == -1)
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return 1;
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read(orsout, result, sizeof(result));
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close(orsout);
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sleep(3);
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}
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return 0;
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}
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