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#!/usr/bin/perl
=encoding UTF-8
=head1 NAME
dh_testroot - ensure that a package is built with necessary level of root permissions
=head1 SYNOPSIS
B<dh_testroot> [S<I<debhelper options>>]
=head1 DESCRIPTION
B<dh_testroot> is used to determine if the target is being run with
suffient access to root(-like) features.
The definition of sufficient access depends on whether the builder
(the tool invoking the F<debian/rules> target) supports the
I<Rules-Requires-Root> (R³) field. If the builder supports R³, then
it will set the environment variable I<DEB_RULES_REQUIRES_ROOT> and
B<dh_testroot> will validate that the builder followed the minimum
requirements for the given value of I<DEB_RULES_REQUIRES_ROOT>.
If the builder does not support I<Rules-Requires-Root>, then it will
not set the I<DEB_RULES_REQUIRES_ROOT> environment variable. This
will in turn make B<dh_testroot> (and the rest of debhelper) fall back
to assuming that (fake)root is implied.
The following is a summary of how B<dh_testroot> behaves based on the
I<DEB_RULES_REQUIRES_ROOT> environment variable (leading and trailing
whitespace in the variable is ignored).
=over 4
=item -
If unset, or set to C<binary-targets>, then B<dh_testroot> asserts
that it is run as root or under L<fakeroot(1)>.
=item -
If set to C<no>, then B<dh_testroot> returns successfully (without
performing any additional checks).
=item -
If set to any other value than the above, then B<dh_testroot> asserts
that it is either run as root (or under L<fakeroot(1)>) or the builder
has provided the B<DEB_GAIN_ROOT_CMD> environment variable (e.g. via
dpkg-buildpackage -r).
=back
Please note that B<dh_testroot> does I<not> read the
I<Rules-Requires-Root> field. Which implies that B<dh_testroot> may
produce incorrect result if the builder lies in
I<DEB_RULES_REQUIRES_ROOT>. On the flip side, it also enables things
like testing for what will happen when I<DEB_RULES_REQUIRES_ROOT> is
set to a given value.
=cut
use strict;
use warnings;
use Debian::Debhelper::Dh_Lib;
our $VERSION = DH_BUILTIN_VERSION;
inhibit_log();
my $requirements = Debian::Debhelper::Dh_Lib::root_requirements();
if (! -f 'debian/control') {
warning('dh_testroot must be called from the source root');
}
# PROMISE: DH NOOP WITHOUT internal(rrr)
# By declaration; nothing requires root and this command must be a no-op in that case.
exit 0 if $requirements eq 'none';
# The builder /can/ choose to ignore the requirements and just call us as root.
# If so, we do not bother checking the requirements any further.
exit 0 if $< == 0;
if ($requirements eq 'legacy-root') {
error("You must run this as root (or use fakeroot).");
} else {
my $env = $ENV{DEB_GAIN_ROOT_CMD};
error("Package needs targeted root but builder has not provided a gain-root command via \${DEB_GAIN_ROOT_CMD}")
if not $env;
}
=head1 SEE ALSO
L<debhelper(7)>
This program is a part of debhelper.
=head1 AUTHOR
Joey Hess <joeyh@debian.org>
=cut
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