I'm trying to follow this tutorial: https://ivrodriguez.com/installing-self-signed-certificates-on-android/
When I get to the step that tries to remount /system as writeable, I am running into problems. Can someone help me figure out what's wrong? Or what my next troubleshooting steps should be?
Thank you in advance.
Below is what I'm able to see from my basic Linux experience.
$ /Users/me/Library/Android/sdk/platform-tools/adb devices
List of devices attached
emulator-5554 device
$ /Users/me/Library/Android/sdk/platform-tools/adb -s emulator-5554 shell
generic_x86:/ $ su
generic_x86:/ # mount -o rw,remount /system
mount: '/system' not in /proc/mounts
It seems as though /system does not exist in /proc/mounts (but I don't know enough about Android file mounting to know what to do about it):
generic_x86:/ # cat /proc/mounts | grep system
# nothing
generic_x86:/ # cat /proc/mounts
tmpfs /dev tmpfs rw,seclabel,nosuid,relatime,mode=755 0 0
devpts /dev/pts devpts rw,seclabel,relatime,mode=600,ptmxmode=000 0 0
proc /proc proc rw,relatime,gid=3009,hidepid=2 0 0
sysfs /sys sysfs rw,seclabel,relatime 0 0
selinuxfs /sys/fs/selinux selinuxfs rw,relatime 0 0
tmpfs /mnt tmpfs rw,seclabel,nosuid,nodev,noexec,relatime,mode=755,gid=1000 0 0
tmpfs /apex tmpfs rw,seclabel,nosuid,nodev,noexec,relatime,mode=755 0 0
/dev/block/dm-2 / ext4 ro,seclabel,nodev,relatime,block_validity,delalloc,barrier,user_xattr 0 0
/dev/block/dm-1 /vendor ext4 ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr 0 0
none /dev/cg2_bpf cgroup2 rw,nosuid,nodev,noexec,relatime 0 0
none /dev/cpuctl cgroup rw,nosuid,nodev,noexec,relatime,cpu 0 0
none /acct cgroup rw,nosuid,nodev,noexec,relatime,cpuacct 0 0
none /dev/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset,noprefix,release_agent=/sbin/cpuset_release_agent 0 0
none /dev/memcg cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0
none /dev/stune cgroup rw,nosuid,nodev,noexec,relatime,schedtune 0 0
/dev/block/dm-2 /apex/com.android.tzdata@290000000 ext4 ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr 0 0
/dev/block/dm-2 /apex/com.android.tzdata ext4 ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr 0 0
/dev/block/dm-2 /apex/com.android.runtime@1 ext4 ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr 0 0
/dev/block/dm-2 /apex/com.android.runtime ext4 ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr 0 0
debugfs /sys/kernel/debug debugfs rw,seclabel,relatime,mode=755 0 0
none /config configfs rw,nosuid,nodev,noexec,relatime 0 0
bpf /sys/fs/bpf bpf rw,nosuid,nodev,noexec,relatime 0 0
pstore /sys/fs/pstore pstore rw,seclabel,nosuid,nodev,noexec,relatime 0 0
tracefs /sys/kernel/debug/tracing tracefs rw,seclabel,relatime 0 0
/dev/block/vdc /data ext4 rw,seclabel,nosuid,nodev,noatime,resgid=1065,errors=panic,data=ordered 0 0
tmpfs /storage tmpfs rw,seclabel,nosuid,nodev,noexec,relatime,mode=755,gid=1000 0 0
/dev/block/dm-2 /apex/com.android.conscrypt@290000000 ext4 ro,seclabel,nodev,relatime,block_validity,delalloc,barrier,user_xattr 0 0
/dev/block/dm-2 /apex/com.android.conscrypt ext4 ro,seclabel,nodev,relatime,block_validity,delalloc,barrier,user_xattr 0 0
/dev/block/dm-2 /apex/com.android.resolv@290000000 ext4 ro,seclabel,nodev,relatime,block_validity,delalloc,barrier,user_xattr 0 0
/dev/block/dm-2 /apex/com.android.resolv ext4 ro,seclabel,nodev,relatime,block_validity,delalloc,barrier,user_xattr 0 0
/dev/block/dm-2 /apex/com.android.media.swcodec@290000000 ext4 ro,seclabel,nodev,relatime,block_validity,delalloc,barrier,user_xattr 0 0
/dev/block/dm-2 /apex/com.android.media.swcodec ext4 ro,seclabel,nodev,relatime,block_validity,delalloc,barrier,user_xattr 0 0
/dev/block/dm-2 /apex/com.android.media@290000000 ext4 ro,seclabel,nodev,relatime,block_validity,delalloc,barrier,user_xattr 0 0
/dev/block/dm-2 /apex/com.android.media ext4 ro,seclabel,nodev,relatime,block_validity,delalloc,barrier,user_xattr 0 0
adb /dev/usb-ffs/adb functionfs rw,relatime 0 0
nsfs /data/vendor/var/run/netns/router nsfs rw 0 0
/data/media /mnt/runtime/default/emulated sdcardfs rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal 0 0
/data/media /storage/emulated sdcardfs rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal 0 0
/data/media /mnt/runtime/read/emulated sdcardfs rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=23,derive_gid,default_normal 0 0
/data/media /mnt/runtime/write/emulated sdcardfs rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7,derive_gid,default_normal 0 0
/data/media /mnt/runtime/full/emulated sdcardfs rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7,derive_gid,default_normal 0 0
/dev/block/vold/public:253,80 /mnt/media_rw/091C-2D02 vfat rw,dirsync,nosuid,nodev,noexec,noatime,uid=1023,gid=1023,fmask=0007,dmask=0007,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0
/mnt/media_rw/091C-2D02 /mnt/runtime/default/091C-2D02 sdcardfs rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,mask=6 0 0
/mnt/media_rw/091C-2D02 /storage/091C-2D02 sdcardfs rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,mask=6 0 0
/mnt/media_rw/091C-2D02 /mnt/runtime/read/091C-2D02 sdcardfs rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,mask=18 0 0
/mnt/media_rw/091C-2D02 /mnt/runtime/write/091C-2D02 sdcardfs rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,mask=18 0 0
/mnt/media_rw/091C-2D02 /mnt/runtime/full/091C-2D02 sdcardfs rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,mask=7 0 0
The /system folder does exist:
generic_x86:/ # ls -la / | grep system
lrw-r--r-- 1 root root 11 2019-09-20 19:50 bin -> /system/bin
drwxrwx--- 2 system cache 4096 2019-09-20 19:22 cache
lrw-r--r-- 1 root root 19 2019-09-20 19:50 charger -> /system/bin/charger
drwxrwx--x 45 system system 4096 2019-10-01 15:58 data
lrw------- 1 root root 23 2019-09-20 19:50 default.prop -> system/etc/prop.default
lrw-r--r-- 1 root root 11 2019-09-20 19:50 etc -> /system/etc
lrwxr-x--- 1 root shell 16 2019-09-20 19:50 init -> /system/bin/init
drwxr-xr-x 12 root system 260 2019-10-08 10:10 mnt
lrw-r--r-- 1 root root 15 2019-09-20 19:50 product -> /system/product
lrw-r--r-- 1 root root 24 2019-09-20 19:50 product_services -> /system/product_services
drwxr-xr-x 13 root root 4096 2019-09-20 19:50 system
generic_x86:/ # ls -la /
total 136
drwxr-xr-x 21 root root 4096 2019-09-20 19:50 .
drwxr-xr-x 21 root root 4096 2019-09-20 19:50 ..
dr-xr-xr-x 70 root root 0 2019-10-08 10:10 acct
-rw-r--r-- 1 root root 723 2019-09-20 19:39 adb_keys
drwxr-xr-x 14 root root 280 2019-10-08 10:10 apex
lrw-r--r-- 1 root root 11 2019-09-20 19:50 bin -> /system/bin
lrw-r--r-- 1 root root 50 2019-09-20 19:50 bugreports -> /data/user_de/0/com.android.shell/files/bugreports
drwxrwx--- 2 system cache 4096 2019-09-20 19:22 cache
lrw-r--r-- 1 root root 19 2019-09-20 19:50 charger -> /system/bin/charger
drwxr-xr-x 4 root root 0 2019-10-08 10:09 config
lrw-r--r-- 1 root root 17 2019-09-20 19:50 d -> /sys/kernel/debug
drwxrwx--x 45 system system 4096 2019-10-01 15:58 data
drwxr-xr-x 2 root root 4096 2019-09-20 19:22 debug_ramdisk
lrw------- 1 root root 23 2019-09-20 19:50 default.prop -> system/etc/prop.default
drwxr-xr-x 19 root root 1420 2019-10-08 10:10 dev
lrw-r--r-- 1 root root 11 2019-09-20 19:50 etc -> /system/etc
lrwxr-x--- 1 root shell 16 2019-09-20 19:50 init -> /system/bin/init
-rwxr-x--- 1 root shell 1653 2019-09-20 19:22 init.environ.rc
-rwxr-x--- 1 root shell 33152 2019-09-20 19:39 init.rc
-rwxr-x--- 1 root shell 7690 2019-09-20 19:39 init.usb.configfs.rc
-rwxr-x--- 1 root shell 5649 2019-09-20 19:39 init.usb.rc
-rwxr-x--- 1 root shell 563 2019-09-20 19:39 init.zygote32.rc
drwx------ 2 root root 16384 2019-09-20 19:51 lost+found
drwxr-xr-x 2 root root 4096 2019-09-20 19:22 metadata
drwxr-xr-x 12 root system 260 2019-10-08 10:10 mnt
drwxr-xr-x 2 root root 4096 2019-09-20 19:22 odm
drwxr-xr-x 2 root root 4096 2019-09-20 19:22 oem
dr-xr-xr-x 201 root root 0 2019-10-08 10:09 proc
lrw-r--r-- 1 root root 15 2019-09-20 19:50 product -> /system/product
lrw-r--r-- 1 root root 24 2019-09-20 19:50 product_services -> /system/product_services
drwxr-xr-x 3 root root 4096 2019-09-20 19:39 res
drwxr-x--- 2 root shell 4096 2019-09-20 19:22 sbin
lrw-r--r-- 1 root root 21 2019-09-20 19:50 sdcard -> /storage/self/primary
drwxr-xr-x 5 root root 100 2019-10-08 10:10 storage
dr-xr-xr-x 12 root root 0 2019-10-08 10:09 sys
drwxr-xr-x 13 root root 4096 2019-09-20 19:50 system
-rw-r--r-- 1 root root 2608 2019-09-20 19:22 ueventd.rc
drwxr-xr-x 8 root root 4096 2019-09-20 19:40 vendor
I got pass this by running emulator with writable system disk (Android 9)
For example
emulator.exe -writable-system -no-snapshot -avd virtual_device
where virtual_device is the name of your configured virtual device (AVD)
Perhaps also this can help
mount -o rw,remount /