Android11 默认开机后台记录logcat日志

软件平台：Android11

硬件平台：QCS6125

    需求：android启动后，默认后台记录logcat日志，并且设置每个文件大小为2M，最多记录30个文件，并且放置的data目录需要开放给app侧读取权限。

改动如下：

diff --git a/logcat/logcatd.rc b/logcat/logcatd.rc
index e19554a55..2fcdd2181 100755
--- a/logcat/logcatd.rc
+++ b/logcat/logcatd.rc
@@ -39,7 +39,7 @@ on property:logd.logpersistd.enable=true && property:logd.logpersistd=clear
     setprop persist.logd.logpersistd ""
     stop logcatd
     # logd for clear of only our files in /data/misc/logd
-    exec - logd log -- /system/bin/logcat -c -f /data/misc/logd/logcat -n ${logd.logpersistd.size:-256}
+    exec - logd log -- /system/bin/logcat -c -f /data/misc/logd/logcat -n ${logd.logpersistd.size:-30}
     setprop logd.logpersistd ""
 
 # stop logcatd service
@@ -52,7 +52,7 @@ on property:logd.logpersistd.enable=false
     stop logcatd
 
 # logcatd service
-service logcatd /system/bin/logcatd -L -b ${logd.logpersistd.buffer:-all} -v threadtime -v usec -v printable -D -f /data/misc/logd/logcat -r ${logd.logpersistd.rotate_kbytes:-2048} -n ${logd.logpersistd.size:-256} --id=${ro.build.id}
+service logcatd /system/bin/logcatd -L -b ${logd.logpersistd.buffer:-all} -v threadtime -v usec -v printable -D -f /data/misc/logd/logcat -r ${logd.logpersistd.rotate_kbytes:-2048} -n ${logd.logpersistd.size:-30} --id=${ro.build.id}
     class late_start
     #disabled
     # logd for write to /data/misc/logd, log group for read from log daemon
diff --git a/logcat/logpersist b/logcat/logpersist
index 05b46f047..f37a0b83d 100755
--- a/logcat/logpersist
+++ b/logcat/logpersist
@@ -21,7 +21,7 @@ log_uid=logd
 log_tag_property=persist.log.tag
 data=/data/misc/logd/logcat
 service=logcatd
-size_default=256
+size_default=30
 buffer_default=all
 args="${@}"

device目录添加app侧读取的selinux权限：

diff --git a/generic/vendor/common/system_app.te b/generic/vendor/common/system_app.te
index 9f74df79..50fdccc6 100755
--- a/generic/vendor/common/system_app.te
+++ b/generic/vendor/common/system_app.te
@@ -63,3 +63,7 @@ allow system_app vendor_sysfs_devicetree_soc:dir { search };
 allow system_app ctl_dumpstate_prop:property_service set;
 allow system_app dumpstate_socket:sock_file write;
 allow system_app dumpstate:unix_stream_socket { connectto read getattr write setattr lock append getopt setopt shutdown listen accept };
+allow system_app misc_logd_file:dir { open read getattr setattr search };
+allow system_app misc_logd_file:file r_file_perms;
+allow system_app tombstone_data_file:dir r_dir_perms;
+allow system_app tombstone_data_file:file r_file_perms;

system目录相关添加：

diff --git a/prebuilts/api/30.0/private/logpersist.te b/prebuilts/api/30.0/private/logpersist.te
index ac324df88..118afcf28 100644
--- a/prebuilts/api/30.0/private/logpersist.te
+++ b/prebuilts/api/30.0/private/logpersist.te
@@ -24,6 +24,6 @@ neverallow logpersist {
   userdebug_or_eng(`-misc_logd_file -coredump_file')
   with_native_coverage(`-method_trace_data_file')
 }:file { create write append };
-neverallow { domain -init -dumpstate -incidentd userdebug_or_eng(`-logpersist -logd') } misc_logd_file:file no_rw_file_perms;
-neverallow { domain -init userdebug_or_eng(`-logpersist -logd') } misc_logd_file:file no_w_file_perms;
-neverallow { domain -init userdebug_or_eng(`-logpersist -logd') } misc_logd_file:dir { add_name link relabelfrom remove_name rename reparent rmdir write };
+neverallow { domain -init -dumpstate -incidentd -system_app userdebug_or_eng(`-logpersist -logd') } misc_logd_file:file no_rw_file_perms;
+neverallow { domain -init -system_app userdebug_or_eng(`-logpersist -logd') } misc_logd_file:file no_w_file_perms;
+neverallow { domain -init -system_app userdebug_or_eng(`-logpersist -logd') } misc_logd_file:dir { add_name link relabelfrom remove_name rename reparent rmdir write };
diff --git a/private/logpersist.te b/private/logpersist.te
index ac324df88..118afcf28 100644
--- a/private/logpersist.te
+++ b/private/logpersist.te
@@ -24,6 +24,6 @@ neverallow logpersist {
   userdebug_or_eng(`-misc_logd_file -coredump_file')
   with_native_coverage(`-method_trace_data_file')
 }:file { create write append };
-neverallow { domain -init -dumpstate -incidentd userdebug_or_eng(`-logpersist -logd') } misc_logd_file:file no_rw_file_perms;
-neverallow { domain -init userdebug_or_eng(`-logpersist -logd') } misc_logd_file:file no_w_file_perms;
-neverallow { domain -init userdebug_or_eng(`-logpersist -logd') } misc_logd_file:dir { add_name link relabelfrom remove_name rename reparent rmdir write };
+neverallow { domain -init -dumpstate -incidentd -system_app userdebug_or_eng(`-logpersist -logd') } misc_logd_file:file no_rw_file_perms;
+neverallow { domain -init -system_app userdebug_or_eng(`-logpersist -logd') } misc_logd_file:file no_w_file_perms;
+neverallow { domain -init -system_app userdebug_or_eng(`-logpersist -logd') } misc_logd_file:dir { add_name link relabelfrom remove_name rename reparent rmdir write };

Mark一下，编译验证调试～