简介

在android上创建用户自定义dir，不像linux上，直接到 / 目录下，mkdir dir 就可以创建，由于android系统selinux对系统安装要求高，特别是android10 、11 ，每个新增dir，file都要加一些te规则，特别是在/目录下。下面有两种方式，可以在/ dir创建，并且支持rw。以下两种方式是在编译系统镜像时，打包到系统里。

  1. 方式一：创建之后，并且在fs_config.cpp/中，把文件权限给到0775，根目录下创建的文件，依旧是read only，暂无找到解决方式。
  2. 方式二：利用软连接的方式，将data目录下的文件夹，链接到/目录，可读可写。

方法一：直接创建

暂无

方法二：软连接方式

diff --git a/bootable/recovery/etc/init.rc b/bootable/recovery/etc/init.rc
index 0822aba..b085044 100644
--- a/bootable/recovery/etc/init.rc
+++ b/bootable/recovery/etc/init.rc
@@ -19,13 +19,18 @@ on init
 
     symlink /system/bin /bin
     symlink /system/etc /etc
+    mkdir /data
+    mkdir /data/tmp
+    mkdir /data/var
+    mkdir /data/run
+    mkdir /data/opt
+    mkdir /data/usr
 
     mount cgroup none /acct cpuacct
     mkdir /acct/uid
 
     mkdir /sdcard
     mkdir /system
-    mkdir /data
     mkdir /cache
     mkdir /sideload
     mkdir /mnt/system
diff --git a/device/qcom/kona/BoardConfig.mk b/device/qcom/kona/BoardConfig.mk
index c6674c4..55c4818 100755
--- a/device/qcom/kona/BoardConfig.mk
+++ b/device/qcom/kona/BoardConfig.mk
@@ -69,6 +69,7 @@ TARGET_COPY_OUT_ODM := odm
 BOARD_ODMIMAGE_FILE_SYSTEM_TYPE := ext4
 AB_OTA_PARTITIONS ?= boot vendor odm dtbo vbmeta
 BOARD_EXT4_SHARE_DUP_BLOCKS := true
+BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE := 104857600
 endif
 
 ifeq ($(ENABLE_AB), true)
diff --git a/system/core/rootdir/Android.mk b/system/core/rootdir/Android.mk
index 24b3999..32eb2cb 100644
--- a/system/core/rootdir/Android.mk
+++ b/system/core/rootdir/Android.mk
@@ -100,6 +105,11 @@ LOCAL_POST_INSTALL_CMD := mkdir -p $(addprefix $(TARGET_ROOT_OUT)/, \
     sbin dev proc sys system data odm oem acct config storage mnt apex debug_ramdisk $(BOARD_ROOT_EXTRA_FOLDERS)); \
     ln -sf /system/bin $(TARGET_ROOT_OUT)/bin; \
     ln -sf /system/etc $(TARGET_ROOT_OUT)/etc; \
+    ln -sf /data/usr $(TARGET_ROOT_OUT)/; \
+    ln -sf /data/tmp $(TARGET_ROOT_OUT)/; \
+    ln -sf /data/var $(TARGET_ROOT_OUT)/; \
+    ln -sf /data/run $(TARGET_ROOT_OUT)/; \
+    ln -sf /data/opt $(TARGET_ROOT_OUT)/; \
     ln -sf /data/user_de/0/com.android.shell/files/bugreports $(TARGET_ROOT_OUT)/bugreports; \
     ln -sf /sys/kernel/debug $(TARGET_ROOT_OUT)/d; \
     ln -sf /storage/self/primary $(TARGET_ROOT_OUT)/sdcard
diff --git a/system/core/rootdir/init.rc b/system/core/rootdir/init.rc
index f563d64..1ae4d70 100755
--- a/system/core/rootdir/init.rc
+++ b/system/core/rootdir/init.rc
@@ -53,7 +53,7 @@ on init
 
     # Link /vendor to /system/vendor for devices without a vendor partition.
     symlink /system/vendor /vendor
-
+    
     # Create energy-aware scheduler tuning nodes
     mkdir /dev/stune/foreground
     mkdir /dev/stune/background
@@ -450,6 +450,12 @@ on post-fs-data
     # Make sure that apexd is started in the default namespace
     enter_default_mount_ns
 
+    mkdir /data/tmp 0775 root system
+    mkdir /data/run 0775 root system
+    mkdir /data/var 0775 root system
+    mkdir /data/usr 0775 root system
+    mkdir /data/opt 0775 root system
+
     # /data/apex is now available. Start apexd to scan and activate APEXes.
     mkdir /data/apex 0750 root system
     mkdir /data/apex/active 0750 root system
diff --git a/system/sepolicy/prebuilts/api/26.0/private/file_contexts b/system/sepolicy/prebuilts/api/26.0/private/file_contexts
index 4485b95..ed877e1 100644
--- a/system/sepolicy/prebuilts/api/26.0/private/file_contexts
+++ b/system/sepolicy/prebuilts/api/26.0/private/file_contexts
@@ -32,6 +32,11 @@
 /sys                u:object_r:sysfs:s0
 
 # Symlinks
+/tmp                u:object_r:rootfs:s0
+/usr                u:object_r:rootfs:s0
+/var                u:object_r:rootfs:s0
+/run                u:object_r:rootfs:s0
+/opt                u:object_r:rootfs:s0
 /bugreports         u:object_r:rootfs:s0
 /d                  u:object_r:rootfs:s0
 /etc                u:object_r:rootfs:s0
@@ -314,6 +319,11 @@
 # propagate to the "Expanded data files" section.
 #
 /data(/.*)?		u:object_r:system_data_file:s0
+/data/tmp(/.*)?         u:object_r:system_data_file:s0
+/data/usr(/.*)?         u:object_r:system_data_file:s0
+/data/var(/.*)?         u:object_r:system_data_file:s0
+/data/run(/.*)?         u:object_r:system_data_file:s0
+/data/opt(/.*)?         u:object_r:system_data_file:s0
 /data/.layout_version		u:object_r:install_data_file:s0
 /data/unencrypted(/.*)?         u:object_r:unencrypted_data_file:s0
 /data/backup(/.*)?		u:object_r:backup_data_file:s0
diff --git a/system/sepolicy/prebuilts/api/27.0/private/file_contexts b/system/sepolicy/prebuilts/api/27.0/private/file_contexts
index 5369758..dc203fc 100644
--- a/system/sepolicy/prebuilts/api/27.0/private/file_contexts
+++ b/system/sepolicy/prebuilts/api/27.0/private/file_contexts
@@ -32,6 +32,11 @@
 /sys                u:object_r:sysfs:s0
 
 # Symlinks
+/tmp                u:object_r:rootfs:s0
+/usr                u:object_r:rootfs:s0
+/var                u:object_r:rootfs:s0
+/run                u:object_r:rootfs:s0
+/opt                u:object_r:rootfs:s0
 /bugreports         u:object_r:rootfs:s0
 /d                  u:object_r:rootfs:s0
 /etc                u:object_r:rootfs:s0
@@ -321,6 +326,11 @@
 # propagate to the "Expanded data files" section.
 #
 /data(/.*)?		u:object_r:system_data_file:s0
+/data/tmp(/.*)?         u:object_r:system_data_file:s0
+/data/usr(/.*)?         u:object_r:system_data_file:s0
+/data/var(/.*)?         u:object_r:system_data_file:s0
+/data/run(/.*)?         u:object_r:system_data_file:s0
+/data/opt(/.*)?         u:object_r:system_data_file:s0
 /data/.layout_version		u:object_r:install_data_file:s0
 /data/unencrypted(/.*)?         u:object_r:unencrypted_data_file:s0
 /data/backup(/.*)?		u:object_r:backup_data_file:s0
diff --git a/system/sepolicy/prebuilts/api/28.0/private/file_contexts b/system/sepolicy/prebuilts/api/28.0/private/file_contexts
index 32eb3f1..9cb51a4 100644
--- a/system/sepolicy/prebuilts/api/28.0/private/file_contexts
+++ b/system/sepolicy/prebuilts/api/28.0/private/file_contexts
@@ -33,6 +33,11 @@
 /firmware/firmware_mnt  u:object_r:rootfs:s0
 
 # Symlinks
+/tmp                u:object_r:rootfs:s0
+/usr                u:object_r:rootfs:s0
+/var                u:object_r:rootfs:s0
+/run                u:object_r:rootfs:s0
+/opt                u:object_r:rootfs:s0
 /bin                u:object_r:rootfs:s0
 /bugreports         u:object_r:rootfs:s0
 /d                  u:object_r:rootfs:s0
@@ -360,6 +365,11 @@
 # propagate to the "Expanded data files" section.
 #
 /data(/.*)?		u:object_r:system_data_file:s0
+/data/tmp(/.*)?         u:object_r:system_data_file:s0
+/data/usr(/.*)?         u:object_r:system_data_file:s0
+/data/var(/.*)?         u:object_r:system_data_file:s0
+/data/run(/.*)?         u:object_r:system_data_file:s0
+/data/opt(/.*)?         u:object_r:system_data_file:s0
 /data/.layout_version		u:object_r:install_data_file:s0
 /data/unencrypted(/.*)?         u:object_r:unencrypted_data_file:s0
 /data/backup(/.*)?		u:object_r:backup_data_file:s0
diff --git a/system/sepolicy/prebuilts/api/29.0/private/file_contexts b/system/sepolicy/prebuilts/api/29.0/private/file_contexts
index d5e0d6c..aa5a0df 100644
--- a/system/sepolicy/prebuilts/api/29.0/private/file_contexts
+++ b/system/sepolicy/prebuilts/api/29.0/private/file_contexts
@@ -33,6 +33,11 @@
 /apex               u:object_r:apex_mnt_dir:s0
 
 # Symlinks
+/tmp                u:object_r:rootfs:s0
+/usr                u:object_r:rootfs:s0
+/var                u:object_r:rootfs:s0
+/run                u:object_r:rootfs:s0
+/opt                u:object_r:rootfs:s0
 /bin                u:object_r:rootfs:s0
 /bugreports         u:object_r:rootfs:s0
 /charger            u:object_r:rootfs:s0
@@ -426,6 +431,11 @@
 # propagate to the "Expanded data files" section.
 #
 /data(/.*)?		u:object_r:system_data_file:s0
+/data/tmp(/.*)?		u:object_r:system_data_file:s0
+/data/usr(/.*)?		u:object_r:system_data_file:s0
+/data/var(/.*)?		u:object_r:system_data_file:s0
+/data/run(/.*)?		u:object_r:system_data_file:s0
+/data/opt(/.*)?		u:object_r:system_data_file:s0
 /data/system/packages\.list u:object_r:packages_list_file:s0
 /data/.layout_version		u:object_r:install_data_file:s0
 /data/unencrypted(/.*)?         u:object_r:unencrypted_data_file:s0
diff --git a/system/sepolicy/private/file_contexts b/system/sepolicy/private/file_contexts
index d5e0d6c..aa5a0df 100644
--- a/system/sepolicy/private/file_contexts
+++ b/system/sepolicy/private/file_contexts
@@ -33,6 +33,11 @@
 /apex               u:object_r:apex_mnt_dir:s0
 
 # Symlinks
+/tmp                u:object_r:rootfs:s0
+/usr                u:object_r:rootfs:s0
+/var                u:object_r:rootfs:s0
+/run                u:object_r:rootfs:s0
+/opt                u:object_r:rootfs:s0
 /bin                u:object_r:rootfs:s0
 /bugreports         u:object_r:rootfs:s0
 /charger            u:object_r:rootfs:s0
@@ -426,6 +431,11 @@
 # propagate to the "Expanded data files" section.
 #
 /data(/.*)?		u:object_r:system_data_file:s0
+/data/tmp(/.*)?		u:object_r:system_data_file:s0
+/data/usr(/.*)?		u:object_r:system_data_file:s0
+/data/var(/.*)?		u:object_r:system_data_file:s0
+/data/run(/.*)?		u:object_r:system_data_file:s0
+/data/opt(/.*)?		u:object_r:system_data_file:s0
 /data/system/packages\.list u:object_r:packages_list_file:s0
 /data/.layout_version		u:object_r:install_data_file:s0
 /data/unencrypted(/.*)?         u:object_r:unencrypted_data_file:s0
# android # linux # java
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