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Magisk
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Change MagiskBoot patch behavior 

Use environment variables to toggle configurations for patching ramdisk
This commit is contained in:
topjohnwu 2019-09-21 05:55:23 -04:00
parent 4d91e50d6d
commit a1ccd44013
3 changed files with 23 additions and 9 deletions
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5
native/jni/magiskboot/main.cpp
View File

@ -61,8 +61,9 @@ Supported actions:
Test the current cpio's patch status
Return values:
0:stock 1:Magisk 2:unsupported (phh, SuperSU, Xposed)
patch KEEPVERITY KEEPFORCEENCRYPT
Ramdisk patches. KEEP**** are boolean values
patch
Apply ramdisk patches. Configure settings with env variables:
KEEPVERITY KEEPFORCEENCRYPT
backup ORIG
Create ramdisk backups from ORIG
restore

23
native/jni/magiskboot/ramdisk.cpp
View File

@ -24,7 +24,7 @@ class magisk_cpio : public cpio_rw {
public:
magisk_cpio() = default;
explicit magisk_cpio(const char *filename) : cpio_rw(filename) {}
void patch(bool keepverity, bool keepforceencrypt);
void patch();
int test();
char *sha1();
void restore();
@ -33,9 +33,17 @@ public:
void decompress();
};
void magisk_cpio::patch(bool keepverity, bool keepforceencrypt) {
static bool check_env(const char *name) {
const char *val = getenv(name);
return val ? strcmp(val, "true") == 0 : false;
}
void magisk_cpio::patch() {
bool keepverity = check_env("KEEPVERITY");
bool keepforceencrypt = check_env("KEEPFORCEENCRYPT");
fprintf(stderr, "Patch with flag KEEPVERITY=[%s] KEEPFORCEENCRYPT=[%s]\n",
keepverity ? "true" : "false", keepforceencrypt ? "true" : "false");
auto next = entries.begin();
decltype(next) cur;
while (next != entries.end()) {
@ -46,9 +54,12 @@ void magisk_cpio::patch(bool keepverity, bool keepforceencrypt) {
str_contains(cur->first, "fstab") && S_ISREG(cur->second->mode);
if (!keepverity) {
if (fstab) {
fprintf(stderr, "Found fstab file [%s]\n", cur->first.data());
auto buf = patch_verity(cur->second->data, cur->second->filesize);
free(cur->second->data);
cur->second->data = buf;
if (buf) {
free(cur->second->data);
cur->second->data = buf;
}
} else if (cur->first == "verity_key") {
rm(cur);
continue;
@ -293,6 +304,8 @@ int cpio_commands(int argc, char *argv[]) {
cpio.compress();
} else if (strcmp(cmdv[0], "decompress") == 0){
cpio.decompress();
} else if (strcmp(cmdv[0], "patch") == 0) {
cpio.patch();
} else if (cmdc == 2 && strcmp(cmdv[0], "exists") == 0) {
exit(!cpio.exists(cmdv[1]));
} else if (cmdc == 2 && strcmp(cmdv[0], "backup") == 0) {
@ -302,8 +315,6 @@ int cpio_commands(int argc, char *argv[]) {
cpio.rm(cmdv[1 + r], r);
} else if (cmdc == 3 && strcmp(cmdv[0], "mv") == 0) {
cpio.mv(cmdv[1], cmdv[2]);
} else if (cmdc == 3 && strcmp(cmdv[0], "patch") == 0) {
cpio.patch(strcmp(cmdv[1], "true") == 0, strcmp(cmdv[2], "true") == 0);
} else if (strcmp(cmdv[0], "extract") == 0) {
if (cmdc == 3) {
return !cpio.extract(cmdv[1], cmdv[2]);

4
scripts/boot_patch.sh
View File

@ -59,6 +59,8 @@ BOOTIMAGE="$1"
[ -z $KEEPVERITY ] && KEEPVERITY=false
[ -z $KEEPFORCEENCRYPT ] && KEEPFORCEENCRYPT=false
[ -z $RECOVERYMODE ] && RECOVERYMODE=false
export KEEPVERITY
export KEEPFORCEENCRYPT
chmod -R 755 .
@ -140,7 +142,7 @@ echo "RECOVERYMODE=$RECOVERYMODE" >> config
./magiskboot cpio ramdisk.cpio \
"add 750 init magiskinit" \
"patch $KEEPVERITY $KEEPFORCEENCRYPT" \
"patch" \
"backup ramdisk.cpio.orig" \
"mkdir 000 .backup" \
"add 000 .backup/.magisk config"