man/ebuild.5: document assert for bug #528760

X-Gentoo-Bug: 528760
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=528760
Acked-by: Alexander Berntsen <bernalex@gentoo.org>
_selinux.setexec: improve failure message (525726)

This converts "OSError: [Errno 22] Invalid argument" into a more
meaningful error message that is designed to guide users in the
right direction. Also, add an import that was missing for the "sys"
module, since it is referenced in the error paths of many functions
in this module.

X-Gentoo-Bug: 525726
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=525726
Acked-by: Brian Dolbec <dolsen@gentoo.org>
Acked-by: Zac Medico <zmedico@gentoo.org>
portageq: fix eroot parameter (bug #529200)

The portageq eroot parameter has been broken since commit
c9f6aa9f0151adb3c86706eaef1914cdbdcf2b6d, due to premature instantiation
of portage.settings (before the ROOT variable was set). Premature access
to the portage.settings attribute must be avoided by using other
available means to determine the EPREFIX.

Fixes: c9f6aa9f0151 ("Add cross-prefix support")
X-Gentoo-Bug: 529200
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=529200
Acked-by: Alexander Berntsen <bernalex@gentoo.org>
fs_template._ensure_dirs: handle EEXIST (529120)

There was a race inside fs_template._ensure_dirs which could cause it to
raise EEXIST if a concurrent process created the directory after
os.path.exists returned False. Fix it by using the util.ensure_dirs
function, which already handles EEXIST.

X-Gentoo-Bug: 529120
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=529120
Acked-by: Alexander Berntsen <bernalex@gentoo.org>
unprivileged mode: generate PORTAGE_DEPCACHEDIR

For unprivileged mode, if PORTAGE_DEPCACHEDIR is unset and the default
PORTAGE_DEPCACHEDIR setting does not refer to a writable directory
(or there are not sufficient permissions to create it), then
automatically make PORTAGE_DEPCACHEDIR relative to the current target
root (which should always be writable for unprivileged mode). Also, in
create_trees, propagate the automatically generated PORTAGE_DEPCACHEDIR
setting to the config instance that is instantiated for ROOT = "/".

The result is that unprivileged mode will get a writable
PORTAGE_DEPCACHEDIR by default, and the default can be overridden by
setting the PORTAGE_DEPCACHEDIR variable.

Fixes: 1364fcd89384 ("Support unprivileged mode for bug #433453.")
X-Gentoo-Bug: 433453
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=433453
Acked-by: Alexander Berntsen <bernalex@gentoo.org>