Provided by: debhelper_13.14.1ubuntu5_all 
NAME
dh_testroot - ensure that a package is built with necessary level of root permissions
SYNOPSIS
dh_testroot [debhelper options]
DESCRIPTION
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 debian/rules
target) supports the Rules-Requires-Root (R³) field. If the builder supports R³, then it will set the
environment variable DEB_RULES_REQUIRES_ROOT and dh_testroot will validate that the builder followed the
minimum requirements for the given value of DEB_RULES_REQUIRES_ROOT.
If the builder does not support Rules-Requires-Root, then it will not set the DEB_RULES_REQUIRES_ROOT
environment variable. This will in turn make dh_testroot (and the rest of debhelper) fall back to
assuming that (fake)root is implied.
The following is a summary of how dh_testroot behaves based on the DEB_RULES_REQUIRES_ROOT environment
variable (leading and trailing whitespace in the variable is ignored).
- If unset, or set to "binary-targets", then dh_testroot asserts that it is run as root or under
fakeroot(1).
- If set to "no", then dh_testroot returns successfully (without performing any additional checks).
- If set to any other value than the above, then dh_testroot asserts that it is either run as root (or
under fakeroot(1)) or the builder has provided the DEB_GAIN_ROOT_CMD environment variable (e.g. via
dpkg-buildpackage -r).
Please note that dh_testroot does not read the Rules-Requires-Root field. Which implies that dh_testroot
may produce incorrect result if the builder lies in DEB_RULES_REQUIRES_ROOT. On the flip side, it also
enables things like testing for what will happen when DEB_RULES_REQUIRES_ROOT is set to a given value.
SEE ALSO
debhelper(7) This program is a part of debhelper.
AUTHOR
Joey Hess <joeyh@debian.org>