Add new cpio command: "exists", to magiskboot

piowind · Dec 6, 2018 · 1fae89c · 1fae89c
1 parent 8b40087
commit 1fae89c
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/native/jni/magiskboot/main.cpp b/native/jni/magiskboot/main.cpp
@@ -39,6 +39,8 @@ static void usage(char *arg0) {
 		"    Do cpio commands to <incpio> (modifications are done directly)\n"
 		"    Each command is a single argument, use quotes if necessary\n"
 		"    Supported commands:\n"
+		"      exists ENTRY\n"
+		"        Return 0 if ENTRY exists, else return 1\n"
 		"      rm [-r] ENTRY\n"
 		"        Remove ENTRY, specify [-r] to remove recursively\n"
 		"      mkdir MODE ENTRY\n"

diff --git a/native/jni/magiskboot/ramdisk.cpp b/native/jni/magiskboot/ramdisk.cpp
@@ -230,7 +230,9 @@ int cpio_commands(int argc, char *argv[]) {
 			char *sha1 = cpio.sha1();
 			if (sha1) printf("%s\n", sha1);
 			return 0;
-		} else if (cmdc >= 2 && strcmp(cmdv[0], "backup") == 0) {
+		} else if (cmdc == 2 && strcmp(cmdv[0], "exists") == 0) {
+			exit(cpio.find(cmdv[1]) < 0);
+		} else if (cmdc == 2 && strcmp(cmdv[0], "backup") == 0) {
 			cpio.backup(cmdv[1]);
 		} else if (cmdc >= 2 && strcmp(cmdv[0], "rm") == 0) {
 			bool r = cmdc > 2 && strcmp(cmdv[1], "-r") == 0;