e6594408d4
* Inject entries for MultiROM folders into /file_contexts instead of editing *.rc files. * Thanks nkk71 for the suggestion.
141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/*
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* This file is part of MultiROM.
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*
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* MultiROM 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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* MultiROM 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 MultiROM. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include "rom_quirks.h"
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#include "lib/log.h"
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#include "lib/util.h"
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static void workaround_mount_in_sh(const char *path)
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{
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char line[512];
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char *tmp_name = NULL;
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FILE *f_in, *f_out;
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f_in = fopen(path, "re");
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if(!f_in)
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return;
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const int size = strlen(path) + 5;
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tmp_name = malloc(size);
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snprintf(tmp_name, size, "%s-new", path);
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f_out = fopen(tmp_name, "we");
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if(!f_out)
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{
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fclose(f_in);
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free(tmp_name);
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return;
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}
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while(fgets(line, sizeof(line), f_in))
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{
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if(strstr(line, "mount ") && strstr(line, "/system"))
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fputc('#', f_out);
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fputs(line, f_out);
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}
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fclose(f_in);
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fclose(f_out);
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rename(tmp_name, path);
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free(tmp_name);
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}
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static void inject_file_contexts(void)
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{
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FILE *f;
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char line[512];
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f = fopen("/file_contexts", "re");
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if(!f)
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{
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ERROR("Failed to open /file_contexts!");
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return;
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}
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while(fgets(line, sizeof(line), f))
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{
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if(strstartswith(line, "/data/media/multirom"))
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{
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INFO("/file_contexts has been already injected.");
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fclose(f);
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return;
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}
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}
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fclose(f);
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INFO("Injecting /file_contexts");
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f = fopen("/file_contexts", "ae");
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if(!f)
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{
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ERROR("Failed to open /file_contexts for appending!");
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return;
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}
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fputs("\n"
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"# MultiROM folders\n"
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"/data/media/multirom(/.*)? <<none>>\n"
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"/data/media/0/multirom(/.*)? <<none>>\n"
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"/realdata/media/multirom(/.*)? <<none>>\n"
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"/realdata/media/0/multirom(/.*)? <<none>>\n"
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"/mnt/mrom(/.*)? <<none>>\n",
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f);
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fclose(f);
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}
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void rom_quirks_on_initrd_finalized(void)
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{
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// walk over all _regular_ files in /
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DIR *d = opendir("/");
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if(d)
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{
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struct dirent *dt;
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char buff[128];
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while((dt = readdir(d)))
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{
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if(dt->d_type != DT_REG)
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continue;
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// The Android L and later releases have SELinux
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// set to "enforcing" and "restorecon_recursive /data" line in init.rc.
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// Restorecon on /data goes into /data/media/0/multirom/roms/ and changes
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// context of all secondary ROMs files to that of /data, including the files
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// in secondary ROMs /system dirs. We need to prevent that.
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// Right now, we do that by adding entries into /file_contexts that say
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// MultiROM folders don't have any context
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if(strcmp(dt->d_name, "file_contexts") == 0)
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inject_file_contexts();
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// franco.Kernel includes script init.fk.sh which remounts /system as read only
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// comment out lines with mount and /system in all .sh scripts in /
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if(strendswith(dt->d_name, ".sh"))
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{
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snprintf(buff, sizeof(buff), "/%s", dt->d_name);
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workaround_mount_in_sh(buff);
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}
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}
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closedir(d);
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}
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}
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