modem: Erase /data/vendor/slog

Free up 2.4GB of space used by leftover modem logs.

Change-Id: If2efcbb9a18a8a945e9620c0df819d0bd82d8ad7

modem/erase_modemlog/Android.bp

@@ -0,0 +1,15 @@
+//
+// SPDX-FileCopyrightText: 2024 The LineageOS Project
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package {
+    default_applicable_licenses: [ "Android-Apache-2.0" ],
+}
+
+sh_binary {
+    name: "erase_modemlog.sh",
+    src: "erase_modemlog.sh",
+    init_rc: ["erase_modemlog.rc"],
+    vendor: true,
+}

modem/erase_modemlog/erase_modemlog.mk

@@ -0,0 +1,10 @@
+#
+# SPDX-FileCopyrightText: 2024 The LineageOS Project
+# SPDX-License-Identifier: Apache-2.0
+#
+
+ifneq (,$(filter userdebug eng, $(TARGET_BUILD_VARIANT)))
+BOARD_VENDOR_SEPOLICY_DIRS += device/google/gs-common/modem/erase_modemlog/sepolicy
+
+PRODUCT_PACKAGES += erase_modemlog.sh
+endif

modem/erase_modemlog/erase_modemlog.rc

@@ -0,0 +1,10 @@
+#
+# SPDX-FileCopyrightText: 2024 The LineageOS Project
+# SPDX-License-Identifier: Apache-2.0
+#
+
+service vendor.erase_modemlog.rc /vendor/bin/erase_modemlog.sh
+    class main
+    user system
+    group system
+    oneshot

modem/erase_modemlog/erase_modemlog.sh

@@ -0,0 +1,13 @@
+#!/vendor/bin/sh
+#
+# SPDX-FileCopyrightText: 2024 The LineageOS Project
+# SPDX-License-Identifier: Apache-2.0
+#
+
+if [ ! -f /data/vendor/slog/erased ]; then
+    rm -rf /data/vendor/slog
+    mkdir /data/vendor/slog
+    chmod 771 /data/vendor/slog
+    chown -hR system.system /data/vendor/slog
+    touch /data/vendor/slog/erased
+fi

modem/erase_modemlog/sepolicy/erase_modemlog.te

@@ -0,0 +1,9 @@
+type erase_modemlog, domain;
+type erase_modemlog_exec, vendor_file_type, exec_type, file_type;
+
+init_daemon_domain(erase_modemlog)
+
+allow erase_modemlog vendor_slog_file:dir create_dir_perms;
+allow erase_modemlog vendor_slog_file:file create_file_perms;
+
+allow erase_modemlog vendor_toolbox_exec:file execute_no_trans;

modem/erase_modemlog/sepolicy/file_contexts

@@ -0,0 +1 @@
+/vendor/bin/erase_modemlog\.sh      u:object_r:erase_modemlog_exec:s0

modem/modem.mk

@@ -1 +1,2 @@
 include device/google/gs-common/modem/dump_modemlog/dump_modemlog.mk
+include device/google/gs-common/modem/erase_modemlog/erase_modemlog.mk