Pixel 3 XL + Android 9でのログ。
apkが実機上でどう展開されるか
crosshatch:/ $ su -
crosshatch:/ # uname -a
Linux localhost 4.9.148-g695fa5606dab-ab5636409 #0 SMP PREEMPT Wed Jun 5 22:19:52 UTC 2019 aarch64
crosshatch:/ # ls -laR /data/app/com.facebook.katana-oPfDPj_DOJvWbtaBHf6sLg==
/data/app/com.facebook.katana-oPfDPj_DOJvWbtaBHf6sLg==:
total 60105
drwxr-xr-x 4 system system 3488 2019-10-10 19:13 .
drwxrwx--x 48 system system 8192 2019-10-16 22:51 ..
-rw-r--r-- 1 system system 61465069 2019-10-10 19:13 base.apk
drwxr-xr-x 3 system system 3488 2019-10-10 19:13 lib
drwxrwx--x 3 system install 3488 2019-10-10 19:13 oat
/data/app/com.facebook.katana-oPfDPj_DOJvWbtaBHf6sLg==/lib:
total 9
drwxr-xr-x 3 system system 3488 2019-10-10 19:13 .
drwxr-xr-x 4 system system 3488 2019-10-10 19:13 ..
drwxr-xr-x 2 system system 3488 2019-10-10 19:13 arm64
/data/app/com.facebook.katana-oPfDPj_DOJvWbtaBHf6sLg==/lib/arm64:
total 1510
drwxr-xr-x 2 system system 3488 2019-10-10 19:13 .
drwxr-xr-x 3 system system 3488 2019-10-10 19:13 ..
-rwxr-xr-x 1 system system 14424 1981-02-02 06:42 libbreakpad_cpp_helper.so
-rwxr-xr-x 1 system system 68584 1981-02-02 06:42 libdistract.so
-rwxr-xr-x 1 system system 68040 1981-02-02 06:42 libfb_xzdecoder.so
-rwxr-xr-x 1 system system 67928 1981-02-02 06:42 libforce_dlopen.so
-rwxr-xr-x 1 system system 1104416 1981-02-02 06:42 libgnustl_shared.so
-rwxr-xr-x 1 system system 69056 1981-02-02 06:42 libsigmux.so
-rwxr-xr-x 1 system system 68048 1981-02-02 06:42 libterminate_handler_manager.so
-rwxr-xr-x 1 system system 68904 1981-02-02 06:42 libtorque.so
/data/app/com.facebook.katana-oPfDPj_DOJvWbtaBHf6sLg==/oat:
total 9
drwxrwx--x 3 system install 3488 2019-10-10 19:13 .
drwxr-xr-x 4 system system 3488 2019-10-10 19:13 ..
drwxrwx--x 2 system install 3488 2019-10-10 19:13 arm64
/data/app/com.facebook.katana-oPfDPj_DOJvWbtaBHf6sLg==/oat/arm64:
total 81186
drwxrwx--x 2 system install 3488 2019-10-10 19:13 .
drwxrwx--x 3 system install 3488 2019-10-10 19:13 ..
-rw-r--r-- 1 system all_a150 237568 2019-10-10 19:14 base.art
-rw-r--r-- 1 system all_a150 2038680 2019-10-10 19:13 base.odex
-rw-r--r-- 1 system all_a150 80767452 2019-10-10 19:14 base.vdex
crosshatch:/ #
大昔と比べると *.apk が置かれるパスの形式が変わったかも？ハッシュ値かランダム値かわからないけど、セキュリティ対策だろうか。
*.so が lib/[arch]/ 以下に置かれるのはAndroid4あたりから変わっていない。
oat/ 以下のファイルはART絡みだろうけど、Dalvik VMの頃の *.dex に当たるファイルが *.odex *.vdex なのだろうか？あとで調べる。
ファイルシステム
crosshatch:/ # mount
/dev/root on / type ext4 (ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr)
tmpfs on /sbin type tmpfs (rw,seclabel,relatime,size=1797420k,nr_inodes=449355,mode=755)
/sbin/.magisk/block/system_root on /sbin/.magisk/mirror/system_root type ext4 (ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr)
/sbin/.magisk/block/system_root on /sbin/charger type ext4 (ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,relatime,size=1797420k,nr_inodes=449355,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,relatime,mode=600,ptmxmode=000)
proc on /proc type proc (rw,relatime,gid=3009,hidepid=2)
sysfs on /sys type sysfs (rw,seclabel,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
tmpfs on /mnt type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=1797420k,nr_inodes=449355,mode=755,gid=1000)
/dev/block/dm-0 on /product type ext4 (ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr)
/dev/block/dm-1 on /vendor type ext4 (ro,seclabel,relatime,block_validity,discard,delalloc,barrier,user_xattr)
none on /acct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct)
none on /dev/memcg type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
debugfs on /sys/kernel/debug type debugfs (rw,seclabel,relatime)
/dev/block/sdf2 on /mnt/vendor/persist type ext4 (rw,seclabel,nosuid,nodev,noatime,data=ordered)
none on /dev/stune type cgroup (rw,nosuid,nodev,noexec,relatime,schedtune)
none on /config type configfs (rw,nosuid,nodev,noexec,relatime)
none on /dev/cpuctl type cgroup (rw,nosuid,nodev,noexec,relatime,cpu)
none on /dev/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset,noprefix,release_agent=/sbin/cpuset_release_agent)
cg2_bpf on /dev/cg2_bpf type cgroup2 (rw,nosuid,nodev,noexec,relatime)
bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime)
tracefs on /sys/kernel/debug/tracing type tracefs (rw,seclabel,relatime)
/dev/block/sda20 on /metadata type ext4 (rw,seclabel,nosuid,nodev,noatime,discard,data=ordered)
/dev/block/sda13 on /vendor/firmware_mnt type vfat (ro,context=u:object_r:firmware_file:s0,relatime,uid=1000,gid=1000,fmask=0337,dmask=0227,codepage=437,iocharset=iso8859-1,shortname=lower,errors=remount-ro)
tmpfs on /storage type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=1797420k,nr_inodes=449355,mode=755,gid=1000)
/dev/block/dm-2 on /data type f2fs (rw,lazytime,seclabel,nosuid,nodev,noatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,flush_merge,extent_cache,mode=adaptive,active_logs=6,reserve_root=32768,resuid=0,resgid=1065,alloc_mode=default)
/sbin/.magisk/block/product on /sbin/.magisk/mirror/product type ext4 (ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr)
/sbin/.magisk/block/vendor on /sbin/.magisk/mirror/vendor type ext4 (ro,seclabel,relatime,block_validity,discard,delalloc,barrier,user_xattr)
/sbin/.magisk/block/data on /sbin/.magisk/mirror/data type f2fs (rw,lazytime,seclabel,relatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,flush_merge,extent_cache,mode=adaptive,active_logs=6,reserve_root=32768,resuid=0,resgid=1065,alloc_mode=default)
/sbin/.magisk/block/data on /sbin/.magisk/modules type f2fs (rw,lazytime,seclabel,relatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,flush_merge,extent_cache,mode=adaptive,active_logs=6,reserve_root=32768,resuid=0,resgid=1065,alloc_mode=default)
adb on /dev/usb-ffs/adb type functionfs (rw,relatime)
mtp on /dev/usb-ffs/mtp type functionfs (rw,relatime)
ptp on /dev/usb-ffs/ptp type functionfs (rw,relatime)
/data/media on /mnt/runtime/default/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal)
/data/media on /storage/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal)
/data/media on /mnt/runtime/read/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=23,derive_gid,default_normal)
/data/media on /mnt/runtime/write/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7,derive_gid,default_normal)
pstore on /sys/fs/pstore type pstore (rw,seclabel,relatime)
crosshatch:/ # df
Filesystem 1K-blocks Used Available Use% Mounted on
tmpfs 1797420 6256 1791164 1% /sbin
/sbin/.magisk/block/system_root 2836724 2211392 625332 78% /sbin/.magisk/mirror/system_root
tmpfs 1797420 600 1796820 1% /dev
tmpfs 1797420 0 1797420 0% /mnt
/dev/block/sdf2 35568 15728 19840 45% /mnt/vendor/persist
/dev/block/sda20 11760 80 11680 1% /metadata
/dev/block/sda13 81872 71088 10784 87% /vendor/firmware_mnt
/sbin/.magisk/block/product 292776 194492 98284 67% /sbin/.magisk/mirror/product
/sbin/.magisk/block/vendor 772828 445068 327760 58% /sbin/.magisk/mirror/vendor
/sbin/.magisk/block/data 116570092 6884504 109685588 6% /sbin/.magisk/mirror/data
/data/media 116570092 6884504 109685588 6% /mnt/runtime/default/emulated
crosshatch:/ # readlink -f /sdcard
/storage/emulated/0
/sdcard 以下はsdcardfs。
/data以下はext4だが、Magisk (rooted用ツール) がラップしているようで、本来どうなっているかは別の環境で確認した方がよさそう。