euscan-ng/src/euscan/ebuild.py

import importlib
import os
import sys

import portage
from portage import _encodings, _shell_quote, _unicode_decode, _unicode_encode
from portage.const import VDB_PATH


# Stolen from the ebuild command
def package_from_ebuild(ebuild):
    pf = None
    if ebuild.endswith(".ebuild"):
        pf = os.path.basename(ebuild)[:-7]
    else:
        return False

    if not os.path.isabs(ebuild):
        mycwd = os.getcwd()
        # Try to get the non-canonical path from the PWD evironment variable,
        # since the canonical path returned from os.getcwd() may may be
        # unusable in cases where the directory stucture is built from
        # symlinks.
        pwd = os.environ.get("PWD", "")
        if sys.hexversion < 0x3000000:
            pwd = _unicode_decode(pwd, encoding=_encodings["content"], errors="strict")
        if pwd and pwd != mycwd and os.path.realpath(pwd) == mycwd:
            mycwd = portage.normalize_path(pwd)
        ebuild = os.path.join(mycwd, ebuild)

    ebuild = portage.normalize_path(ebuild)
    # portdbapi uses the canonical path for the base of the portage tree, but
    # subdirectories of the base can be built from symlinks (like crossdev
    # does).
    ebuild_portdir = os.path.realpath(
        os.path.dirname(os.path.dirname(os.path.dirname(ebuild)))
    )
    ebuild = os.path.join(ebuild_portdir, *ebuild.split(os.path.sep)[-3:])
    vdb_path = os.path.join(portage.settings["ROOT"], VDB_PATH)

    # Make sure that portdb.findname() returns the correct ebuild.
    if ebuild_portdir != vdb_path and ebuild_portdir not in portage.portdb.porttrees:
        if sys.hexversion >= 0x3000000:
            os.environ["PORTDIR_OVERLAY"] = (
                os.environ.get("PORTDIR_OVERLAY", "")
                + " "
                + _shell_quote(ebuild_portdir)
            )
        else:
            os.environ["PORTDIR_OVERLAY"] = (
                os.environ.get("PORTDIR_OVERLAY", "")
                + " "
                + _unicode_encode(
                    _shell_quote(ebuild_portdir),
                    encoding=_encodings["content"],
                    errors="strict",
                )
            )

        portage.close_portdbapi_caches()
        importlib.reload(portage)
    del portage.portdb.porttrees[1:]
    if ebuild_portdir != portage.portdb.porttree_root:
        portage.portdb.porttrees.append(ebuild_portdir)

    if not os.path.exists(ebuild):
        return False

    ebuild_split = ebuild.split("/")
    cpv = "%s/%s" % (ebuild_split[-3], pf)

    if not portage.catpkgsplit(cpv):
        return False

    if ebuild.startswith(os.path.join(portage.root, portage.const.VDB_PATH)):
        mytree = "vartree"

        portage_ebuild = portage.db[portage.root][mytree].dbapi.findname(cpv)

        if os.path.realpath(portage_ebuild) != ebuild:
            return False

    else:
        mytree = "porttree"

        portage_ebuild = portage.portdb.findname(cpv)

        if not portage_ebuild or portage_ebuild != ebuild:
            return False

    return cpv