Some lines missing when execing with a tty #1838
Description
When exec'ing into a container with "terminal": true some lines do not display properly in a few circumstances.
A bisect suggests that this behaviour appeared in 8b972be.
Compilation Details
Dynamically linked against musl. Behaviour observed from musl v1.2.3 and v1.2.5.
> /tmp/crun --version
crun version 1.21
commit: 10269840aa07fb7e6b7e1acff6198692d8ff5c88
rundir: /run/crun
spec: 1.0.0
+SELINUX +APPARMOR +CAP +SECCOMP +EBPF +YAJLExamples
Control
In this example, all lines will display as expected:
> cat etc/protocols | while read line; do echo $line; done;
# Internet (IP) protocols
#
# Updated from http://www.iana.org/assignments/protocol-numbers and other
# sources.
...Standard Cat
In this example, the output will appear truncated, seemingly at random. On some runs all lines will show, on others only a subset, as if "tail" or similar had been used:
> cat etc/protocols
class 4 [RFC905]
dccp 33 DCCP # Datagram Congestion Control Prot. [RFC4340]
xtp 36 XTP # Xpress Transfer Protocol
...Less / Vim
In interactive shell programs, some lines may appear missing, lines appear jumbled and overriding each other. Editing a line causes it to "refresh" with the correct value.