[gentoo-portage-dev] [PATCH] Implement host dependencies (HDEPEND) and dependencies only in affect when ROOT != / (targetroot flag).

[Ambroz Bizjak <ambrop7@gmail.com>]

---
 bin/ebuild.sh                        | 30 ++++++++++++++-----
 pym/_emerge/depgraph.py              | 57 +++++++++++++++++++++---------------
 pym/_emerge/main.py                  |  1 -
 pym/portage/__init__.py              |  4 +--
 pym/portage/dbapi/bintree.py         |  6 ++--
 pym/portage/dbapi/porttree.py        |  2 +-
 pym/portage/dbapi/vartree.py         |  1 +
 pym/portage/eapi.py                  |  9 +++++-
 pym/portage/package/ebuild/config.py | 14 +++++++--
 9 files changed, 85 insertions(+), 39 deletions(-)

diff --git a/bin/ebuild.sh b/bin/ebuild.sh
index 79da2b5..a376d2f 100755
--- a/bin/ebuild.sh
+++ b/bin/ebuild.sh
@@ -215,6 +215,7 @@ inherit() {
 	local B_DEPEND
 	local B_RDEPEND
 	local B_PDEPEND
+	local B_HDEPEND
 	while [ "$1" ]; do
 		location="${ECLASSDIR}/${1}.eclass"
 		olocation=""
@@ -257,20 +258,21 @@ inherit() {
 				EBUILD_OVERLAY_ECLASSES="${EBUILD_OVERLAY_ECLASSES} ${location}"
 		fi
 
-		#We need to back up the value of DEPEND and RDEPEND to B_DEPEND and B_RDEPEND
+		#We need to back up the values of *DEPEND to B_*DEPEND
 		#(if set).. and then restore them after the inherit call.
 
 		#turn off glob expansion
 		set -f
 
 		# Retain the old data and restore it later.
-		unset B_IUSE B_REQUIRED_USE B_DEPEND B_RDEPEND B_PDEPEND
+		unset B_IUSE B_REQUIRED_USE B_DEPEND B_RDEPEND B_PDEPEND B_HDEPEND
 		[ "${IUSE+set}"       = set ] && B_IUSE="${IUSE}"
 		[ "${REQUIRED_USE+set}" = set ] && B_REQUIRED_USE="${REQUIRED_USE}"
 		[ "${DEPEND+set}"     = set ] && B_DEPEND="${DEPEND}"
 		[ "${RDEPEND+set}"    = set ] && B_RDEPEND="${RDEPEND}"
 		[ "${PDEPEND+set}"    = set ] && B_PDEPEND="${PDEPEND}"
-		unset IUSE REQUIRED_USE DEPEND RDEPEND PDEPEND
+		[ "${HDEPEND+set}"    = set ] && B_HDEPEND="${HDEPEND}"
+		unset IUSE REQUIRED_USE DEPEND RDEPEND PDEPEND HDEPEND
 		#turn on glob expansion
 		set +f
 
@@ -286,6 +288,7 @@ inherit() {
 		[ "${DEPEND+set}"       = set ] && E_DEPEND+="${E_DEPEND:+ }${DEPEND}"
 		[ "${RDEPEND+set}"      = set ] && E_RDEPEND+="${E_RDEPEND:+ }${RDEPEND}"
 		[ "${PDEPEND+set}"      = set ] && E_PDEPEND+="${E_PDEPEND:+ }${PDEPEND}"
+		[ "${HDEPEND+set}"      = set ] && E_HDEPEND+="${E_HDEPEND:+ }${HDEPEND}"
 
 		[ "${B_IUSE+set}"     = set ] && IUSE="${B_IUSE}"
 		[ "${B_IUSE+set}"     = set ] || unset IUSE
@@ -302,6 +305,9 @@ inherit() {
 		[ "${B_PDEPEND+set}"  = set ] && PDEPEND="${B_PDEPEND}"
 		[ "${B_PDEPEND+set}"  = set ] || unset PDEPEND
 
+		[ "${B_HDEPEND+set}"  = set ] && HDEPEND="${B_HDEPEND}"
+		[ "${B_HDEPEND+set}"  = set ] || unset HDEPEND
+
 		#turn on glob expansion
 		set +f
 
@@ -528,8 +534,9 @@ if ! has "$EBUILD_PHASE" clean cleanrm ; then
 		# In order to ensure correct interaction between ebuilds and
 		# eclasses, they need to be unset before this process of
 		# interaction begins.
-		unset EAPI DEPEND RDEPEND PDEPEND INHERITED IUSE REQUIRED_USE \
-			ECLASS E_IUSE E_REQUIRED_USE E_DEPEND E_RDEPEND E_PDEPEND
+		unset EAPI DEPEND RDEPEND PDEPEND HDEPEND INHERITED IUSE REQUIRED_USE \
+			ECLASS E_IUSE E_REQUIRED_USE E_DEPEND E_RDEPEND E_PDEPEND \
+			E_HDEPEND
 
 		if [[ $PORTAGE_DEBUG != 1 || ${-/x/} != $- ]] ; then
 			source "$EBUILD" || die "error sourcing ebuild"
@@ -560,9 +567,10 @@ if ! has "$EBUILD_PHASE" clean cleanrm ; then
 		DEPEND+="${DEPEND:+ }${E_DEPEND}"
 		RDEPEND+="${RDEPEND:+ }${E_RDEPEND}"
 		PDEPEND+="${PDEPEND:+ }${E_PDEPEND}"
+		HDEPEND+="${HDEPEND:+ }${E_HDEPEND}"
 		REQUIRED_USE+="${REQUIRED_USE:+ }${E_REQUIRED_USE}"
 		
-		unset ECLASS E_IUSE E_REQUIRED_USE E_DEPEND E_RDEPEND E_PDEPEND \
+		unset ECLASS E_IUSE E_REQUIRED_USE E_DEPEND E_RDEPEND E_PDEPEND E_HDEPEND \
 			__INHERITED_QA_CACHE
 
 		# alphabetically ordered by $EBUILD_PHASE value
@@ -664,9 +672,17 @@ if [[ $EBUILD_PHASE = depend ]] ; then
 
 	auxdbkeys="DEPEND RDEPEND SLOT SRC_URI RESTRICT HOMEPAGE LICENSE
 		DESCRIPTION KEYWORDS INHERITED IUSE REQUIRED_USE PDEPEND PROVIDE EAPI
-		PROPERTIES DEFINED_PHASES UNUSED_05 UNUSED_04
+		PROPERTIES DEFINED_PHASES HDEPEND UNUSED_04
 		UNUSED_03 UNUSED_02 UNUSED_01"
 
+	case "$EAPI" in
+		5-hdepend)
+			;;
+		*)
+			unset HDEPEND
+			;;
+	esac
+
 	# The extra $(echo) commands remove newlines.
 	if [ -n "${dbkey}" ] ; then
 		> "${dbkey}"
diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py
index 9da202c..dca1a74 100644
--- a/pym/_emerge/depgraph.py
+++ b/pym/_emerge/depgraph.py
@@ -24,7 +24,7 @@ from portage.dep import Atom, best_match_to_list, extract_affecting_use, \
 	_repo_separator
 from portage.dep._slot_operator import ignore_built_slot_operator_deps
 from portage.eapi import eapi_has_strong_blocks, eapi_has_required_use, \
-	_get_eapi_attrs
+	_get_eapi_attrs, eapi_has_hdepend
 from portage.exception import (InvalidAtom, InvalidDependString,
 	PackageNotFound, PortageException)
 from portage.output import colorize, create_color_func, \
@@ -504,7 +504,7 @@ class depgraph(object):
 
 	pkg_tree_map = RootConfig.pkg_tree_map
 
-	_dep_keys = ["DEPEND", "RDEPEND", "PDEPEND"]
+	_dep_keys = ["DEPEND", "RDEPEND", "PDEPEND", "HDEPEND"]
 	
 	def __init__(self, settings, trees, myopts, myparams, spinner,
 		frozen_config=None, backtrack_parameters=BacktrackParameter(), allow_backtracking=False):
@@ -537,10 +537,6 @@ class depgraph(object):
 			preload_installed_pkgs = \
 				"--nodeps" not in self._frozen_config.myopts
 
-			if self._frozen_config.myopts.get("--root-deps") is not None and \
-				myroot != self._frozen_config.target_root:
-				continue
-
 			fake_vartree = self._frozen_config.trees[myroot]["vartree"]
 			if not fake_vartree.dbapi:
 				# This needs to be called for the first depgraph, but not for
@@ -1685,7 +1681,7 @@ class depgraph(object):
 		removal_action = "remove" in self._dynamic_config.myparams
 
 		edepend={}
-		depkeys = ["DEPEND","RDEPEND","PDEPEND"]
+		depkeys = ["DEPEND","RDEPEND","PDEPEND","HDEPEND"]
 		for k in depkeys:
 			edepend[k] = metadata[k]
 
@@ -1713,31 +1709,44 @@ class depgraph(object):
 			# Removal actions never traverse ignored buildtime
 			# dependencies, so it's safe to discard them early.
 			edepend["DEPEND"] = ""
+			edepend["HDEPEND"] = ""
 			ignore_build_time_deps = True
 
+		ignore_depend_deps = ignore_build_time_deps
+		ignore_hdepend_deps = ignore_build_time_deps
+
 		if removal_action:
 			depend_root = myroot
 		else:
-			depend_root = self._frozen_config._running_root.root
-			root_deps = self._frozen_config.myopts.get("--root-deps")
-			if root_deps is not None:
-				if root_deps is True:
-					depend_root = myroot
-				elif root_deps == "rdeps":
-					ignore_build_time_deps = True
+			if eapi_has_hdepend(pkg.metadata['EAPI']):
+				depend_root = myroot
+			else:
+				depend_root = self._frozen_config._running_root.root
+				root_deps = self._frozen_config.myopts.get("--root-deps")
+				if root_deps is not None:
+					if root_deps is True:
+						depend_root = myroot
+					elif root_deps == "rdeps":
+						ignore_depend_deps = True
 
 		# If rebuild mode is not enabled, it's safe to discard ignored
 		# build-time dependencies. If you want these deps to be traversed
 		# in "complete" mode then you need to specify --with-bdeps=y.
-		if ignore_build_time_deps and \
-			not self._rebuild.rebuild:
-			edepend["DEPEND"] = ""
-
+		if not self._rebuild.rebuild:
+			if ignore_depend_deps:
+				edepend["DEPEND"] = ""
+			if ignore_hdepend_deps:
+				edepend["HDEPEND"] = ""
+		
 		deps = (
 			(depend_root, edepend["DEPEND"],
 				self._priority(buildtime=True,
-				optional=(pkg.built or ignore_build_time_deps),
-				ignored=ignore_build_time_deps)),
+				optional=(pkg.built or ignore_depend_deps),
+				ignored=ignore_depend_deps)),
+			(self._frozen_config._running_root.root, edepend["HDEPEND"],
+				self._priority(buildtime=True,
+				optional=(pkg.built or ignore_hdepend_deps),
+				ignored=ignore_hdepend_deps)),
 			(myroot, edepend["RDEPEND"],
 				self._priority(runtime=True)),
 			(myroot, edepend["PDEPEND"],
@@ -2838,7 +2847,7 @@ class depgraph(object):
 			return [pkg.slot_atom for pkg in greedy_pkgs]
 
 		blockers = {}
-		blocker_dep_keys = ["DEPEND", "PDEPEND", "RDEPEND"]
+		blocker_dep_keys = ["DEPEND", "PDEPEND", "RDEPEND", "HDEPEND"]
 		for pkg in greedy_pkgs + [highest_pkg]:
 			dep_str = " ".join(pkg.metadata[k] for k in blocker_dep_keys)
 			try:
@@ -3099,7 +3108,7 @@ class depgraph(object):
 
 		if target_atom is not None and isinstance(node, Package):
 			affecting_use = set()
-			for dep_str in "DEPEND", "RDEPEND", "PDEPEND":
+			for dep_str in "DEPEND", "RDEPEND", "PDEPEND", "HDEPEND":
 				try:
 					affecting_use.update(extract_affecting_use(
 						node.metadata[dep_str], target_atom,
@@ -3183,10 +3192,12 @@ class depgraph(object):
 					dep_strings.add(node.metadata["DEPEND"])
 					dep_strings.add(node.metadata["RDEPEND"])
 					dep_strings.add(node.metadata["PDEPEND"])
+					dep_strings.add(node.metadata["HDEPEND"])
 				else:
 					for priority in priorities:
 						if priority.buildtime:
 							dep_strings.add(node.metadata["DEPEND"])
+							dep_strings.add(node.metadata["HDEPEND"])
 						if priority.runtime:
 							dep_strings.add(node.metadata["RDEPEND"])
 						if priority.runtime_post:
@@ -4129,7 +4140,7 @@ class depgraph(object):
 			if pkg not in self._dynamic_config.digraph.nodes:
 				return False
 
-			for key in "DEPEND", "RDEPEND", "PDEPEND", "LICENSE":
+			for key in "DEPEND", "RDEPEND", "PDEPEND", "HDEPEND", "LICENSE":
 				dep = pkg.metadata[key]
 				old_val = set(portage.dep.use_reduce(dep, pkg.use.enabled, is_valid_flag=pkg.iuse.is_valid_flag, flat=True))
 				new_val = set(portage.dep.use_reduce(dep, new_use, is_valid_flag=pkg.iuse.is_valid_flag, flat=True))
diff --git a/pym/_emerge/main.py b/pym/_emerge/main.py
index d19b795..c3e9646 100644
--- a/pym/_emerge/main.py
+++ b/pym/_emerge/main.py
@@ -977,7 +977,6 @@ def parse_opts(tmpcmdline, silent=False):
 			"type"     : "choice",
 			"choices"  : true_y_or_n
 		},
-
 	}
 
 	from optparse import OptionParser
diff --git a/pym/portage/__init__.py b/pym/portage/__init__.py
index 30c7e72..695f1ea 100644
--- a/pym/portage/__init__.py
+++ b/pym/portage/__init__.py
@@ -414,7 +414,7 @@ def abssymlink(symlink, target=None):
 
 _doebuild_manifest_exempt_depend = 0
 
-_testing_eapis = frozenset(["4-python", "4-slot-abi", "5-progress"])
+_testing_eapis = frozenset(["4-python", "4-slot-abi", "5-progress", "5-hdepend"])
 _deprecated_eapis = frozenset(["4_pre1", "3_pre2", "3_pre1", "5_pre1", "5_pre2"])
 
 def _eapi_is_deprecated(eapi):
@@ -472,7 +472,7 @@ auxdbkeys = (
 	'RESTRICT',  'HOMEPAGE',  'LICENSE',   'DESCRIPTION',
 	'KEYWORDS',  'INHERITED', 'IUSE', 'REQUIRED_USE',
 	'PDEPEND',   'PROVIDE', 'EAPI',
-	'PROPERTIES', 'DEFINED_PHASES', 'UNUSED_05', 'UNUSED_04',
+	'PROPERTIES', 'DEFINED_PHASES', 'HDEPEND', 'UNUSED_04',
 	'UNUSED_03', 'UNUSED_02', 'UNUSED_01',
 )
 auxdbkeylen=len(auxdbkeys)
diff --git a/pym/portage/dbapi/bintree.py b/pym/portage/dbapi/bintree.py
index 7f09436..921f51d 100644
--- a/pym/portage/dbapi/bintree.py
+++ b/pym/portage/dbapi/bintree.py
@@ -75,6 +75,7 @@ class bindbapi(fakedbapi):
 			["BUILD_TIME", "CHOST", "DEPEND", "EAPI", "IUSE", "KEYWORDS",
 			"LICENSE", "PDEPEND", "PROPERTIES", "PROVIDE",
 			"RDEPEND", "repository", "RESTRICT", "SLOT", "USE", "DEFINED_PHASES",
+			"HDEPEND",
 			])
 		self._aux_cache_slot_dict = slot_dict_class(self._aux_cache_keys)
 		self._aux_cache = {}
@@ -304,11 +305,11 @@ class binarytree(object):
 				["BUILD_TIME", "CHOST", "DEPEND", "DESCRIPTION", "EAPI",
 				"IUSE", "KEYWORDS", "LICENSE", "PDEPEND", "PROPERTIES",
 				"PROVIDE", "RDEPEND", "repository", "SLOT", "USE", "DEFINED_PHASES",
-				"BASE_URI"]
+				"BASE_URI", "HDEPEND"]
 			self._pkgindex_aux_keys = list(self._pkgindex_aux_keys)
 			self._pkgindex_use_evaluated_keys = \
 				("LICENSE", "RDEPEND", "DEPEND",
-				"PDEPEND", "PROPERTIES", "PROVIDE")
+				"PDEPEND", "PROPERTIES", "PROVIDE", "HDEPEND")
 			self._pkgindex_header_keys = set([
 				"ACCEPT_KEYWORDS", "ACCEPT_LICENSE",
 				"ACCEPT_PROPERTIES", "CBUILD",
@@ -330,6 +331,7 @@ class binarytree(object):
 				"SLOT"    : "0",
 				"USE"     : "",
 				"DEFINED_PHASES" : "",
+				"HDEPEND" : "",
 			}
 			self._pkgindex_inherited_keys = ["CHOST", "repository"]
 
diff --git a/pym/portage/dbapi/porttree.py b/pym/portage/dbapi/porttree.py
index 0cb290f..b6b3d00 100644
--- a/pym/portage/dbapi/porttree.py
+++ b/pym/portage/dbapi/porttree.py
@@ -189,7 +189,7 @@ class portdbapi(dbapi):
 		self._aux_cache_keys = set(
 			["DEPEND", "EAPI", "INHERITED", "IUSE", "KEYWORDS", "LICENSE",
 			"PDEPEND", "PROPERTIES", "PROVIDE", "RDEPEND", "repository",
-			"RESTRICT", "SLOT", "DEFINED_PHASES", "REQUIRED_USE"])
+			"RESTRICT", "SLOT", "DEFINED_PHASES", "REQUIRED_USE", "HDEPEND"])
 
 		self._aux_cache = {}
 		self._broken_ebuilds = set()
diff --git a/pym/portage/dbapi/vartree.py b/pym/portage/dbapi/vartree.py
index 7d6d6a8..0822883 100644
--- a/pym/portage/dbapi/vartree.py
+++ b/pym/portage/dbapi/vartree.py
@@ -164,6 +164,7 @@ class vardbapi(dbapi):
 			"EAPI", "HOMEPAGE", "IUSE", "KEYWORDS",
 			"LICENSE", "PDEPEND", "PROPERTIES", "PROVIDE", "RDEPEND",
 			"repository", "RESTRICT" , "SLOT", "USE", "DEFINED_PHASES",
+			"HDEPEND",
 			])
 		self._aux_cache_obj = None
 		self._aux_cache_filename = os.path.join(self._eroot,
diff --git a/pym/portage/eapi.py b/pym/portage/eapi.py
index b12d81d..7c45843 100644
--- a/pym/portage/eapi.py
+++ b/pym/portage/eapi.py
@@ -83,9 +83,15 @@ def eapi_supports_stable_use_forcing_and_masking(eapi):
 def eapi_allows_directories_on_profile_level_and_repository_level(eapi):
 	return eapi in ("4-python", "5-progress")
 
+def eapi_has_hdepend(eapi):
+	return eapi in ("5-hdepend",)
+
+def eapi_has_targetroot(eapi):
+	return eapi in ("5-hdepend",)
+
 _eapi_attrs = collections.namedtuple('_eapi_attrs',
 	'dots_in_PN dots_in_use_flags exports_EBUILD_PHASE_FUNC '
-	'feature_flag_test iuse_defaults iuse_effective '
+	'feature_flag_test feature_flag_targetroot iuse_defaults iuse_effective '
 	'repo_deps required_use required_use_at_most_one_of slot_operator slot_deps '
 	'src_uri_arrows strong_blocks use_deps use_dep_defaults')
 
@@ -112,6 +118,7 @@ def _get_eapi_attrs(eapi):
 		dots_in_use_flags = (eapi is None or eapi_allows_dots_in_use_flags(eapi)),
 		exports_EBUILD_PHASE_FUNC = (eapi is None or eapi_exports_EBUILD_PHASE_FUNC(eapi)),
 		feature_flag_test = True,
+		feature_flag_targetroot = eapi_has_targetroot(eapi),
 		iuse_defaults = (eapi is None or eapi_has_iuse_defaults(eapi)),
 		iuse_effective = (eapi is not None and eapi_has_iuse_effective(eapi)),
 		repo_deps = (eapi is None or eapi_has_repo_deps(eapi)),
diff --git a/pym/portage/package/ebuild/config.py b/pym/portage/package/ebuild/config.py
index 894d14c..4992292 100644
--- a/pym/portage/package/ebuild/config.py
+++ b/pym/portage/package/ebuild/config.py
@@ -33,7 +33,8 @@ from portage.dbapi.porttree import portdbapi
 from portage.dbapi.vartree import vartree
 from portage.dep import Atom, isvalidatom, match_from_list, use_reduce, _repo_separator, _slot_separator
 from portage.eapi import eapi_exports_AA, eapi_exports_merge_type, \
-	eapi_supports_prefix, eapi_exports_replace_vars, _get_eapi_attrs
+	eapi_supports_prefix, eapi_exports_replace_vars, _get_eapi_attrs, \
+	eapi_has_targetroot
 from portage.env.loaders import KeyValuePairFileLoader
 from portage.exception import InvalidDependString, PortageException
 from portage.localization import _
@@ -63,7 +64,7 @@ if sys.hexversion >= 0x3000000:
 _feature_flags_cache = {}
 
 def _get_feature_flags(eapi_attrs):
-	cache_key = (eapi_attrs.feature_flag_test,)
+	cache_key = (eapi_attrs.feature_flag_test, eapi_attrs.feature_flag_targetroot)
 	flags = _feature_flags_cache.get(cache_key)
 	if flags is not None:
 		return flags
@@ -71,6 +72,8 @@ def _get_feature_flags(eapi_attrs):
 	flags = []
 	if eapi_attrs.feature_flag_test:
 		flags.append("test")
+	if eapi_attrs.feature_flag_targetroot:
+		flags.append("targetroot")
 
 	flags = frozenset(flags)
 	_feature_flags_cache[cache_key] = flags
@@ -1503,6 +1506,13 @@ class config(object):
 					self.usemask = \
 						frozenset(x for x in self.usemask if x != "test")
 
+		if ("targetroot" in explicit_iuse or iuse_implicit_match("targetroot")) and \
+			eapi_has_targetroot(eapi):
+			if self["ROOT"] != "/":
+				use.add("targetroot")
+			else:
+				use.discard("targetroot")
+
 		# Allow _* flags from USE_EXPAND wildcards to pass through here.
 		use.difference_update([x for x in use \
 			if (x not in explicit_iuse and \
-- 
1.7.12