OBS fails to resolve correctly for zypper calls using exec form

[SchoolGuy]

Issue Description

Containers built with a Dockerfile and the exec-form for the RUN command don't have the packages asked for available. When switching to the shell form it works as expected.

Expected Result

The packages installed using the exec-form of zypper should be recognized and available during the build.

How to Reproduce

FROM opensuse/tumbleweed

# Works
RUN zypper in -n apache2

# Doesn't work
RUN ["zypper", "in", "-n", "python3-distro"]

1. Use provided Dockerfile and build in OBS/IBS
2. See error described above

Further Information

Project where this can be seen (revision 3): https://build.opensuse.org/package/show/home:cobbler-project:github-ci:release32/cobbler-docker-testing

[SchoolGuy]

In the meantime, I committed revision 4 which is building with (relative - only x86_64) success.

[SchoolGuy]

A little bird (@Vogtinator) told me that this is actually a bug in obs-build. Feel free to move the issue.

It seems to be an issue with the following script:

obs-build/Build/Docker.pm

Lines 345 to 367 in df01e0c

	} elsif ($cmd eq 'RUN') {
	$line =~ s/#.*//; # get rid of comments
	for my $l (split(/(?:\||\|\||\&|\&\&|;|\)|\()/, $line)) {
	$l =~ s/^\s+//;
	$l =~ s/\s+$//;
	$l = expandvars($l, $vars) if $l =~ /\$/;
	@args = split(/[ \t]+/, $l);
	s/%([a-fA-F0-9]{2})/chr(hex($1))/ge for @args;
	next unless @args;
	my $rcmd = shift @args;
	$rcmd = shift @args if @args && ($rcmd eq 'then' || $rcmd eq 'else' || $rcmd eq 'elif' || $rcmd eq 'if' || $rcmd eq 'do');
	if ($rcmd eq 'zypper') {
	cmd_zypper($ret, @args);
	} elsif ($rcmd eq 'yum' || $rcmd eq 'dnf') {
	cmd_dnf($ret, @args);
	} elsif ($rcmd eq 'apt-get') {
	cmd_apt_get($ret, @args);
	} elsif ($rcmd eq 'curl') {
	cmd_curl($ret, @args);
	} elsif ($rcmd eq 'obs_pkg_mgr') {
	cmd_obs_pkg_mgr($ret, @args);
	}
	}