[Bug]: Docker containers cannot refer to one another by name

[ygottlieb-peratonlabs-com]

Problem description

Following the Docker network tutorial for user-defined networks does not allow two containers to ping each other by name.

This is caused by the docker/resolvconf.patch that adds @TERMUX_PREFIX@ in moby/container/container_unix.go even though the paths in that file refer to the file system inside the container rather than the one outside of it.

What steps will reproduce the bug?

1. Install containerd patched as described in [Bug]: docker/containerd #18359 (comment) or [Bug]: docker/containerd #18359 (comment)
2. Install docker and tsu

   pkg install docker tsu
   

3. Become root

   sudo bash
   

4. Start dockerd

   dockerd -G 0 > /dev/null 2>&1 &
   

5. Create a user-defined network:

   docker network create --driver bridge alpine-net
   

6. Create a docker container to receive pings

   docker run --name alpine1 --rm -dit --net alpine-net alpine ash
   

7. Create a docker container to ping alpine1

   docker run --name alpine2 --rm -it --net alpine-net alpine ping -c 2 alpine1
   

The result is

ping: bad address 'alpine1'

Note also that

~ # docker exec alpine1 ls /etc/resolv.conf
ls: /etc/resolv.conf: No such file or directory
~ # docker exec alpine1 cat /data/data/com.termux/files/usr/etc/resolv.conf 
nameserver 127.0.0.11
options ndots:0

What is the expected behavior?

Ping should succeed:

PING alpine1 (172.19.0.2): 56 data bytes
64 bytes from 172.19.0.2: seq=0 ttl=64 time=0.500 ms
64 bytes from 172.19.0.2: seq=1 ttl=64 time=0.542 ms

--- alpine1 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
router-trip min/avg/max = 0.500/0.521/0.542 ms

System information

termux-info:

Termux Variables:
unsupported
Packages CPU architecture:
x86_64
Subscribed repositories:
# sources.list
deb https://packages-cf.termux.dev/apt/termux-main stable main
# root-repo (sources.list.d/root.list)
deb https://packages-cf.termux.dev/apt/termux-root root stable
Updatable packages:
Running as root. Cannot check package updates.
termux-tools version:
1.40.5
Android version:
9
Kernel build information:
Linux phone 4.19.195-android-x86_64-g8a9ae81896cb-dirty #8 SMP PREEMPT Wed Nov 22 20:19:56 UTC 2023 x86_64 Android
Device manufacturer:
QEMU
Device model:
Standard PC (i440FX + PIIX, 1996)
LD Variables:
LD_LIBRARY_PATH=
LD_PRELOAD=/data/data/com.termux/files/usr/lib/libtermux-exec.so

[sylirre]

Try upgrading docker package now.

[ygottlieb-peratonlabs-com]

@sylirre
The update works for me. Thank you!