1a1b956201
When 'toolbox run ulimit' is invoked, it comes down to invoking
"bash --login -c 'exec ulimit'" inside the container, and it leads to
different outcomes on Fedora and Ubuntu hosts.
On Fedora:
$ bash --login -c 'exec ulimit'
unlimited
On Ubuntu:
$ bash --login -c 'exec ulimit'
bash: line 1: exec: ulimit: not found
This is because Bash's exec built-in cannot execute another built-in and
needs an external command; and Fedora ships a wrapper for the ulimit
built-in as an external command [1] to satisfy POSIX [2]:
$ cat /usr/bin/ulimit
#!/usr/bin/sh
builtin ulimit "$@"
... that Ubuntu doesn't.
Wrapping the 'ulimit' as 'bash -c ulimit' solves this problem because
then it becomes "bash --login -c 'exec bash -c ulimit'", and the exec
built-in can execute the external command bash(1).
[1] Fedora bash commit 3b09d0d67fe7ff4c
Fedora bash commit a28ab9933095eaf6
https://src.fedoraproject.org/rpms/bash/c/3b09d0d67fe7ff4c
https://src.fedoraproject.org/rpms/bash/c/a28ab9933095eaf6
https://bugzilla.redhat.com/show_bug.cgi?id=1297166
[2] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/toc.html
https://github.com/containers/toolbox/pull/1599
Signed-off-by: Penn Bauman <me@pennbauman.com>
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