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Magisk
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Support replacing existing .rc by overlay.d 

Co-authored-by: topjohnwu <topjohnwu@gmail.com>
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LoveSy 2022-12-26 19:28:10 +08:00 committed by GitHub
parent 1b745ae1a0
commit 5763a3d908
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2 changed files with 12 additions and 2 deletions
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2
docs/guides.md
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@ -257,7 +257,7 @@ Since `/` is read-only on system-as-root devices, Magisk provides an overlay sys
Overlay files shall be placed in the `overlay.d` folder in boot image ramdisk, and they follow these rules:
1. All `*.rc` files in `overlay.d` will be read and concatenated **AFTER** `init.rc`
1. Each `*.rc` file (except for `init.rc`) in `overlay.d` will be read and concatenated **AFTER** `init.rc` if it does not exist in the root directory, otherwise it will **REPLACE** the existing one.
2. Existing files can be replaced by files located at the same relative path
3. Files that correspond to a non-existing file will be ignored

12
native/src/init/rootdir.cpp
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@ -68,8 +68,18 @@ static void load_overlay_rc(const char *overlay) {
int dfd = dirfd(dir.get());
// Do not allow overwrite init.rc
unlinkat(dfd, "init.rc", 0);
// '/' + name + '\0'
char buf[NAME_MAX + 2];
buf[0] = '/';
for (dirent *entry; (entry = xreaddir(dir.get()));) {
if (str_ends(entry->d_name, ".rc")) {
if (!str_ends(entry->d_name, ".rc")) {
continue;
}
strscpy(buf + 1, entry->d_name, sizeof(buf) - 1);
if (access(buf, F_OK) == 0) {
LOGD("Replace rc script [%s]\n", entry->d_name);
} else {
LOGD("Found rc script [%s]\n", entry->d_name);
int rc = xopenat(dfd, entry->d_name, O_RDONLY | O_CLOEXEC);
rc_list.push_back(full_read(rc));