Add install wrapper

... to work around Gentoo's wrapper idiosyncrasy.

Signed-off-by: Alexey Neyman <stilor@att.net>

scripts/crosstool-NG.sh.in

@@ -116,8 +116,12 @@ cat "${CT_LIB_DIR}/paths.sh" |while read trash line; do
        tmpl="${CT_LIB_DIR}/scripts/override/__default"
     fi
     CT_DoLog DEBUG "Creating script-override for '${tool}' -> '${path}' using '${tmpl}' template"
-    ${sed} -r -e "s#@CONFIG_SHELL@#${CT_CONFIG_SHELL}#g" \
-              -e "s#@TOOL_PATH@#${path}#g" "${tmpl}" > "${CT_TOOLS_OVERRIDE_DIR}/bin/${tool}"
+    CT_DoExecLog ALL cp "${tmpl}" "${CT_TOOLS_OVERRIDE_DIR}/bin/${tool}"
+    CT_DoExecLog ALL ${sed} -i -r \
+              -e "s#@CONFIG_SHELL@#${CT_CONFIG_SHELL}#g" \
+              -e "s#@TOOL_PATH@#${path}#g" \
+              -e "s#@TOOLS_OVERRIDE_DIR@#${CT_TOOLS_OVERRIDE_DIR}#g" \
+              "${CT_TOOLS_OVERRIDE_DIR}/bin/${tool}"
     CT_DoExecLog ALL chmod 700 "${CT_TOOLS_OVERRIDE_DIR}/bin/${tool}"
 done
 export PATH="${CT_TOOLS_OVERRIDE_DIR}/bin:${PATH}"

scripts/override/install

@@ -0,0 +1,35 @@
+#!@CONFIG_SHELL@
+
+# Do the most common case first
+if [ -z "${__PORTAGE_HELPER_PATH}" ]; then
+    exec @TOOL_PATH@ "$@"
+fi
+
+# Not so simple case: Gentoo uses *two* wrappers around install script
+# to deal with extended attributes:
+#  - /usr/lib/portage/python*/ebuild-helpers/xattr/install
+#    This sets __PORTAGE_HELPER_PATH (see the check above) and
+#    invokes either C- or Python-based wrapper (they do the same
+#    thing anyway). E.g., let it be /usr/bin/install-xattrs...
+#  - /usr/bin/install-xattrs
+#    This now analyzes $PATH and invokes 'install' in the first directory
+#    in $PATH where it is found, but not the __PORTAGE_HELPER_PATH
+# This scheme breaks if we interject another install wrapper, resulting
+# in a fork bomb. Hence, if we detected a loop, we need to remove our
+# own directory from $PATH and try again. Ironically, the very code below
+# based on that portage helper.
+IFS=:
+set -f
+path=
+for x in ${PATH}; do
+    case "${x}" in
+    @TOOLS_OVERRIDE_DIR@/bin) continue;;
+    esac
+    if test -n "${path}"; then
+        path="${path}:${x}"
+    else
+        path="${x}"
+    fi
+done
+PATH="${path}"
+exec @TOOL_PATH@ "$@"