[OnePlus 6T  Questions & Answers] xstefen:
https://github.com/OnePlusOSS/OpenSourceReleases/wiki

Contained in the 6T 9.0.12 archive are

[xstefen@leviathan external]$ ls -alFrt
total 244
drwxr-xr-x 2 xstefen xstefen 4096 Feb 11 20:14 abi-dumper/
drwxr-xr-x 4 xstefen xstefen 4096 Feb 11 20:14 abi-compliance-checker/
drwxr-xr-x 16 xstefen xstefen 4096 Feb 11 20:14 aac/
drwxr-xr-x 3 xstefen xstefen 4096 Feb 11 20:14 ant-glob/
drwxr-xr-x 21 xstefen xstefen 4096 Feb 11 20:14 autotest/
drwxr-xr-x 5 xstefen xstefen 4096 Feb 11 20:14 blktrace/
drwxr-xr-x 3 xstefen xstefen 4096 Feb 11 20:15 dnsmasq/
drwxr-xr-x 7 xstefen xstefen 4096 Feb 11 20:15 dtc/
drwxr-xr-x 18 xstefen xstefen 4096 Feb 11 20:15 e2fsprogs/
drwxr-xr-x 14 xstefen xstefen 4096 Feb 11 20:15 eigen/
drwxr-xr-x 19 xstefen xstefen 4096 Feb 11 20:15 elfutils/
drwxr-xr-x 7 xstefen xstefen 4096 Feb 11 20:15 error_prone/
drwxr-xr-x 7 xstefen xstefen 4096 Feb 11 20:15 emma/
drwxr-xr-x 3 xstefen xstefen 4096 Feb 11 20:15 esd/
drwxr-xr-x 10 xstefen xstefen 4096 Feb 11 20:15 f2fs-tools/
drwxr-xr-x 16 xstefen xstefen 4096 Feb 11 20:15 fio/
drwxr-xr-x 2 xstefen xstefen 4096 Feb 11 20:15 fec/
drwxr-xr-x 7 xstefen xstefen 4096 Feb 11 20:15 fonttools/
drwxr-xr-x 5 xstefen xstefen 4096 Feb 11 20:15 google-styleguide/
drwxr-xr-x 2 xstefen xstefen 4096 Feb 11 20:15 gptfdisk/
drwxr-xr-x 38 xstefen xstefen 4096 Feb 11 20:15 hyphenation-patterns/
drwxr-xr-x 7 xstefen xstefen 4096 Feb 11 20:15 icu/
drwxr-xr-x 20 xstefen xstefen 4096 Feb 11 20:15 iproute2/
drwxr-xr-x 11 xstefen xstefen 4096 Feb 11 20:15 iptables/
drwxr-xr-x 24 xstefen xstefen 4096 Feb 11 20:15 jacoco/
drwxr-xr-x 5 xstefen xstefen 4096 Feb 11 20:15 javassist/
drwxr-xr-x 4 xstefen xstefen 4096 Feb 11 20:15 jdiff/
drwxr-xr-x 3 xstefen xstefen 4096 Feb 11 20:15 junit/
drwxr-xr-x 10 xstefen xstefen 4096 Feb 11 20:15 kmod/
drwxr-xr-x 4 xstefen xstefen 4096 Feb 11 20:15 kernel-headers/
drwxr-xr-x 5 xstefen xstefen 4096 Feb 11 20:15 kotlinc/
drwxr-xr-x 3 xstefen xstefen 4096 Feb 11 20:16 libcap-ng/
drwxr-xr-x 4 xstefen xstefen 4096 Feb 11 20:16 libcups/
drwxr-xr-x 10 xstefen xstefen 4096 Feb 11 20:16 libexif/
drwxr-xr-x 7 xstefen xstefen 4096 Feb 11 20:16 libmicrohttpd/
drwxr-xr-x 11 xstefen xstefen 4096 Feb 11 20:16 libnl/
drwxr-xr-x 7 xstefen xstefen 4096 Feb 11 20:16 libnfnetlink/
drwxr-xr-x 9 xstefen xstefen 4096 Feb 11 20:16 libnetfilter_conntrack/
drwxr-xr-x 8 xstefen xstefen 4096 Feb 11 20:16 libmtp/
drwxr-xr-x 14 xstefen xstefen 4096 Feb 11 20:16 libusb/
drwxr-xr-x 13 xstefen xstefen 4096 Feb 11 20:16 libvncserver/
drwxr-xr-x 6 xstefen xstefen 4096 Feb 11 20:16 libusb-compat/
drwxr-xr-x 4 xstefen xstefen 4096 Feb 11 20:16 linux-kselftest/
drwxr-xr-x 9 xstefen xstefen 4096 Feb 11 20:16 lz4/
drwxr-xr-x 15 xstefen xstefen 4096 Feb 11 20:16 ltp/
drwxr-xr-x 4 xstefen xstefen 4096 Feb 11 20:16 mmc-utils/
drwxr-xr-x 5 xstefen xstefen 4096 Feb 11 20:16 netperf/
drwxr-xr-x 2 xstefen xstefen 4096 Feb 11 20:16 nfacct/
drwxr-xr-x 7 xstefen xstefen 4096 Feb 11 20:16 noto-fonts/
drwxr-xr-x 5 xstefen xstefen 4096 Feb 11 20:16 oj-libjdwp/
drwxr-xr-x 8 xstefen xstefen 4096 Feb 11 20:17 proguard/
drwxr-xr-x 17 xstefen xstefen 4096 Feb 11 20:17 selinux/
drwxr-xr-x 3 xstefen xstefen 4096 Feb 11 20:17 seccomp-tests/
drwxr-xr-x 6 xstefen xstefen 4096 Feb 11 20:17 squashfs-tools/
drwxr-xr-x 33 xstefen xstefen 4096 Feb 11 20:17 syslinux/
drwxr-xr-x 4 xstefen xstefen 4096 Feb 11 20:17 unicode/
drwxr-xr-x 25 xstefen xstefen 4096 Feb 11 20:17 valgrind/
drwxr-xr-x 2 xstefen xstefen 4096 Feb 11 20:18 x264/
drwxr-xr-x 4 xstefen xstefen 4096 Feb 11 20:18 xmlrpcpp/
drwxr-xr-x 4 xstefen xstefen 4096 Mar 6 16:25 ../
drwxr-xr-x 61 xstefen xstefen 4096 Mar 6 16:25 ./
[xstefen@leviathan external]$ ls -alFrt abi-
abi-compliance-checker/ abi-dumper/
[xstefen@leviathan external]$ ls -alFrt abi-dumper/
total 248
-rw-r--r-- 1 xstefen xstefen 638 Feb 11 20:14 README.google
-rw-r--r-- 1 xstefen xstefen 1182 Feb 11 20:14 README
-rw-r--r-- 1 xstefen xstefen 22 Feb 11 20:14 OWNERS
-rw-r--r-- 1 xstefen xstefen 185 Feb 11 20:14 NOTICE
-rw-r--r-- 1 xstefen xstefen 0 Feb 11 20:14 MODULE_LICENSE_GPL
-rw-r--r-- 1 xstefen xstefen 6515 Feb 11 20:14 Makefile.pl
-rw-r--r-- 1 xstefen xstefen 146 Feb 11 20:14 Makefile
-rw-r--r-- 1 xstefen xstefen 185 Feb 11 20:14 LICENSE
-rw-r--r-- 1 xstefen xstefen 26530 Feb 11 20:14 LGPL-2.1
-rw-r--r-- 1 xstefen xstefen 1088 Feb 11 20:14 INSTALL
-rw-r--r-- 1 xstefen xstefen 18092 Feb 11 20:14 GPL-2.0
-rwxr-xr-x 1 xstefen xstefen 156223 Feb 11 20:14 abi-dumper.pl*
drwxr-xr-x 2 xstefen xstefen 4096 Feb 11 20:14 ./
drwxr-xr-x 61 xstefen xstefen 4096 Mar 6 16:25 ../

Yes, its source code. Yes its various packages. But in what way does this relate to our device and is it useful?