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Add ramdisk overlay to magiskinit

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topjohnwu 2017-09-12 00:56:21 +08:00
parent 717890395b
commit 8662537883
1 changed files with 48 additions and 2 deletions
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50
jni/magiskinit.c
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@ -66,6 +66,45 @@ static void clone_dir(int src, int dest) {
} }
} }
static void mv_dir(int src, int dest) {
struct dirent *entry;
DIR *dir;
int newsrc, newdest;
struct stat st;
char buf[PATH_MAX];
ssize_t size;
dir = fdopendir(src);
while ((entry = readdir(dir))) {
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
continue;
fstatat(src, entry->d_name, &st, AT_SYMLINK_NOFOLLOW);
switch (entry->d_type) {
case DT_DIR:
mkdirat(dest, entry->d_name, st.st_mode & 0777);
fchownat(dest, entry->d_name, st.st_uid, st.st_gid, 0);
newsrc = openat(src, entry->d_name, O_RDONLY | O_CLOEXEC);
newdest = openat(dest, entry->d_name, O_RDONLY | O_CLOEXEC);
mv_dir(newsrc, newdest);
close(newsrc);
close(newdest);
break;
case DT_REG:
renameat(src, entry->d_name, dest, entry->d_name);
fchmodat(dest, entry->d_name, st.st_mode & 0777, 0);
fchownat(dest, entry->d_name, st.st_uid, st.st_gid, 0);
break;
case DT_LNK:
size = readlinkat(src, entry->d_name, buf, sizeof(buf));
buf[size] = '\0';
symlinkat(buf, dest, entry->d_name);
fchownat(dest, entry->d_name, st.st_uid, st.st_gid, AT_SYMLINK_NOFOLLOW);
break;
}
unlinkat(src, entry->d_name, AT_REMOVEDIR);
}
}
static void rm_rf(int path) { static void rm_rf(int path) {
struct dirent *entry; struct dirent *entry;
int newfd; int newfd;
@ -76,6 +115,9 @@ static void rm_rf(int path) {
continue; continue;
switch (entry->d_type) { switch (entry->d_type) {
case DT_DIR: case DT_DIR:
// Preserve overlay
if (strcmp(entry->d_name, "overlay") == 0)
continue;
newfd = openat(path, entry->d_name, O_RDONLY | O_CLOEXEC); newfd = openat(path, entry->d_name, O_RDONLY | O_CLOEXEC);
rm_rf(newfd); rm_rf(newfd);
close(newfd); close(newfd);
@ -185,13 +227,17 @@ int main(int argc, char *argv[]) {
mkdir("/system_root", 0755); mkdir("/system_root", 0755);
mount(dev.path, "/system_root", "ext4", MS_RDONLY, NULL); mount(dev.path, "/system_root", "ext4", MS_RDONLY, NULL);
int system_root = open("/system_root", O_RDONLY | O_CLOEXEC); int system_root = open("/system_root", O_RDONLY | O_CLOEXEC);
clone_dir(system_root, root); clone_dir(system_root, root);
mount("/system_root/system", "/system", NULL, MS_BIND, NULL); mount("/system_root/system", "/system", NULL, MS_BIND, NULL);
int overlay = open("/overlay", O_RDONLY | O_CLOEXEC);
if (overlay > 0)
mv_dir(overlay, root);
close(root); close(root);
close(system_root); close(system_root);
close(overlay);
rmdir("/overlay");
} else { } else {
// Recovery mode // Recovery mode
// Revert original init binary // Revert original init binary