Android rom开发：编译阶段设置预置文件或者文件夹的权限

修改system/core/libcutils/fs_config.cpp，加入对应的路径即可

static const struct fs_path_config android_dirs[] = {
    // clang-format off
    { 00770, AID_SYSTEM,       AID_CACHE,        0, "cache" },
    { 00555, AID_ROOT,         AID_ROOT,         0, "config" },
    { 00771, AID_SYSTEM,       AID_SYSTEM,       0, "data/app" },
    { 00771, AID_SYSTEM,       AID_SYSTEM,       0, "data/app-private" },
    { 00771, AID_SYSTEM,       AID_SYSTEM,       0, "data/app-ephemeral" },
    { 00771, AID_ROOT,         AID_ROOT,         0, "data/dalvik-cache" },
    { 00771, AID_SYSTEM,       AID_SYSTEM,       0, "data/data" },
    { 00771, AID_SHELL,        AID_SHELL,        0, "data/local/tmp" },
    { 00771, AID_SHELL,        AID_SHELL,        0, "data/local" },
    { 00770, AID_DHCP,         AID_DHCP,         0, "data/misc/dhcp" },
    { 00771, AID_SHARED_RELRO, AID_SHARED_RELRO, 0, "data/misc/shared_relro" },
    { 01771, AID_SYSTEM,       AID_MISC,         0, "data/misc" },
    { 00775, AID_MEDIA_RW,     AID_MEDIA_RW,     0, "data/media/Music" },
    { 00775, AID_MEDIA_RW,     AID_MEDIA_RW,     0, "data/media" },
    { 00750, AID_ROOT,         AID_SHELL,        0, "data/nativetest" },
    { 00750, AID_ROOT,         AID_SHELL,        0, "data/nativetest64" },
    { 00775, AID_ROOT,         AID_ROOT,         0, "data/preloads" },
    { 00771, AID_SYSTEM,       AID_SYSTEM,       0, "data" },
    { 00755, AID_ROOT,         AID_SYSTEM,       0, "mnt" },
    { 00755, AID_ROOT,         AID_SHELL,        0, "product/bin" },
    { 00750, AID_ROOT,         AID_SHELL,        0, "sbin" },
    { 00777, AID_ROOT,         AID_ROOT,         0, "sdcard" },
    { 00751, AID_ROOT,         AID_SDCARD_R,     0, "storage" },
    { 00755, AID_ROOT,         AID_SHELL,        0, "system/bin" },
    { 00755, AID_ROOT,         AID_ROOT,         0, "system/etc/ppp" },
    { 00755, AID_ROOT,         AID_SHELL,        0, "system/vendor" },
    { 00755, AID_ROOT,         AID_SHELL,        0, "system/xbin" },
    { 00755, AID_ROOT,         AID_SHELL,        0, "vendor" },
    { 00755, AID_ROOT,         AID_ROOT,         0, 0 },
    // clang-format on
};

static const struct fs_path_config android_files[] = {
    // clang-format off
    { 00644, AID_SYSTEM,    AID_SYSTEM,    0, "data/app/*" },
    { 00644, AID_SYSTEM,    AID_SYSTEM,    0, "data/app-ephemeral/*" },
    { 00644, AID_SYSTEM,    AID_SYSTEM,    0, "data/app-private/*" },
    { 00644, AID_APP,       AID_APP,       0, "data/data/*" },
    { 00644, AID_MEDIA_RW,  AID_MEDIA_RW,  0, "data/media/*" },
    { 00640, AID_ROOT,      AID_SHELL,     0, "data/nativetest/tests.txt" },
    { 00640, AID_ROOT,      AID_SHELL,     0, "data/nativetest64/tests.txt" },
    { 00750, AID_ROOT,      AID_SHELL,     0, "data/nativetest/*" },
    { 00750, AID_ROOT,      AID_SHELL,     0, "data/nativetest64/*" },
    { 00600, AID_ROOT,      AID_ROOT,      0, "default.prop" }, // legacy
    { 00600, AID_ROOT,      AID_ROOT,      0, "system/etc/prop.default" },
    { 00600, AID_ROOT,      AID_ROOT,      0, "odm/build.prop" },
    { 00600, AID_ROOT,      AID_ROOT,      0, "odm/default.prop" },
    { 00444, AID_ROOT,      AID_ROOT,      0, odm_conf_dir + 1 },
    { 00444, AID_ROOT,      AID_ROOT,      0, odm_conf_file + 1 },
    { 00444, AID_ROOT,      AID_ROOT,      0, oem_conf_dir + 1 },
    { 00444, AID_ROOT,      AID_ROOT,      0, oem_conf_file + 1 },
    { 00600, AID_ROOT,      AID_ROOT,      0, "product/build.prop" },
    { 00750, AID_ROOT,      AID_SHELL,     0, "sbin/fs_mgr" },
    { 00755, AID_ROOT,      AID_SHELL,     0, "system/bin/crash_dump32" },
    { 00755, AID_ROOT,      AID_SHELL,     0, "system/bin/crash_dump64" },
    { 00755, AID_ROOT,      AID_SHELL,     0, "system/bin/debuggerd" },
    { 00750, AID_ROOT,      AID_ROOT,      0, "system/bin/install-recovery.sh" },
    { 00700, AID_ROOT,      AID_ROOT,      0, "system/bin/secilc" },
    { 00750, AID_ROOT,      AID_ROOT,      0, "system/bin/uncrypt" },
    { 00600, AID_ROOT,      AID_ROOT,      0, "system/build.prop" },
    { 00444, AID_ROOT,      AID_ROOT,      0, sys_conf_dir + 1 },
    { 00444, AID_ROOT,      AID_ROOT,      0, sys_conf_file + 1 },
    { 00440, AID_ROOT,      AID_SHELL,     0, "system/etc/init.goldfish.rc" },
    { 00550, AID_ROOT,      AID_SHELL,     0, "system/etc/init.goldfish.sh" },
    { 00550, AID_ROOT,      AID_SHELL,     0, "system/etc/init.ril" },
    { 00555, AID_ROOT,      AID_ROOT,      0, "system/etc/ppp/*" },
    { 00555, AID_ROOT,      AID_ROOT,      0, "system/etc/rc.*" },
    { 00440, AID_ROOT,      AID_ROOT,      0, "system/etc/recovery.img" },
    { 00600, AID_ROOT,      AID_ROOT,      0, "vendor/build.prop" },
    { 00600, AID_ROOT,      AID_ROOT,      0, "vendor/default.prop" },
    { 00444, AID_ROOT,      AID_ROOT,      0, ven_conf_dir + 1 },
    { 00444, AID_ROOT,      AID_ROOT,      0, ven_conf_file + 1 },

    // the following two files are INTENTIONALLY set-uid, but they
    // are NOT included on user builds.
    { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/procmem" },
    { 04750, AID_ROOT,      AID_SHELL,     0, "system/xbin/su" },

    // the following files have enhanced capabilities and ARE included
    // in user builds.
    { 00700, AID_SYSTEM,    AID_SHELL,     CAP_MASK_LONG(CAP_BLOCK_SUSPEND),
                                              "system/bin/inputflinger" },
    { 00550, AID_LOGD,      AID_LOGD,      CAP_MASK_LONG(CAP_SYSLOG) |
                                           CAP_MASK_LONG(CAP_AUDIT_CONTROL) |
                                           CAP_MASK_LONG(CAP_SETGID),
                                              "system/bin/logd" },
    { 00550, AID_SYSTEM,    AID_LOG,      CAP_MASK_LONG(CAP_SYSLOG),
                                              "system/bin/bootstat" },
    { 00750, AID_ROOT,      AID_SHELL,     CAP_MASK_LONG(CAP_SETUID) |
                                           CAP_MASK_LONG(CAP_SETGID),
                                              "system/bin/run-as" },

    // Support FIFO scheduling mode in SurfaceFlinger.
    { 00755, AID_SYSTEM,    AID_GRAPHICS,  CAP_MASK_LONG(CAP_SYS_NICE),
                                              "system/bin/surfaceflinger" },
    // generic defaults
    { 00755, AID_ROOT,      AID_ROOT,      0, "bin/*" },
    { 00640, AID_ROOT,      AID_SHELL,     0, "fstab.*" },
    { 00750, AID_ROOT,      AID_SHELL,     0, "init*" },
    { 00755, AID_ROOT,      AID_SHELL,     0, "product/bin/*" },
    { 00750, AID_ROOT,      AID_SHELL,     0, "sbin/*" },
    { 00755, AID_ROOT,      AID_SHELL,     0, "system/bin/*" },
    { 00755, AID_ROOT,      AID_ROOT,      0, "system/lib/valgrind/*" },
    { 00755, AID_ROOT,      AID_ROOT,      0, "system/lib64/valgrind/*" },
    { 00755, AID_ROOT,      AID_SHELL,     0, "system/xbin/*" },
    { 00755, AID_ROOT,      AID_SHELL,     0, "vendor/bin/*" },
    { 00755, AID_ROOT,      AID_SHELL,     0, "vendor/xbin/*" },
    { 00644, AID_ROOT,      AID_ROOT,      0, 0 },
    // clang-format on
};