bitbake: fetch2: Add crate fetcher

This imports the crate fetcher from OE-Core to resolve various module issues
and adds some very very basic tests of that new fetcher.

(Bitbake rev: 1f06f326fa8b47e2a4dce756d57a9369a2225201)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 139 insertions, 0 deletions

diff --git a/bitbake/lib/bb/fetch2/__init__.py b/bitbake/lib/bb/fetch2/__init__.py
index 0b39ea6aaa..d37174185a 100644
--- a/bitbake/lib/bb/fetch2/__init__.py
+++ b/bitbake/lib/bb/fetch2/__init__.py
@@ -1942,6 +1942,7 @@ from . import clearcase
 from . import npm
 from . import npmsw
 from . import az
+from . import crate
 
 methods.append(local.Local())
 methods.append(wget.Wget())
@@ -1962,3 +1963,4 @@ methods.append(clearcase.ClearCase())
 methods.append(npm.Npm())
 methods.append(npmsw.NpmShrinkWrap())
 methods.append(az.Az())
+methods.append(crate.Crate())
diff --git a/bitbake/lib/bb/fetch2/crate.py b/bitbake/lib/bb/fetch2/crate.py
new file mode 100644
index 0000000000..f7e2354afb
--- /dev/null
+++ b/bitbake/lib/bb/fetch2/crate.py
@@ -0,0 +1,137 @@
+# ex:ts=4:sw=4:sts=4:et
+# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+"""
+BitBake 'Fetch' implementation for crates.io
+"""
+
+# Copyright (C) 2016 Doug Goldstein
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Based on functions from the base bb module, Copyright 2003 Holger Schurig
+
+import hashlib
+import json
+import os
+import shutil
+import subprocess
+import bb
+from   bb.fetch2 import logger, subprocess_setup, UnpackError
+from   bb.fetch2.wget import Wget
+
+
+class Crate(Wget):
+
+    """Class to fetch crates via wget"""
+
+    def _cargo_bitbake_path(self, rootdir):
+        return os.path.join(rootdir, "cargo_home", "bitbake")
+
+    def supports(self, ud, d):
+        """
+        Check to see if a given url is for this fetcher
+        """
+        return ud.type in ['crate']
+
+    def recommends_checksum(self, urldata):
+        return False
+
+    def urldata_init(self, ud, d):
+        """
+        Sets up to download the respective crate from crates.io
+        """
+
+        if ud.type == 'crate':
+            self._crate_urldata_init(ud, d)
+
+        super(Crate, self).urldata_init(ud, d)
+
+    def _crate_urldata_init(self, ud, d):
+        """
+        Sets up the download for a crate
+        """
+
+        # URL syntax is: crate://NAME/VERSION
+        # break the URL apart by /
+        parts = ud.url.split('/')
+        if len(parts) < 5:
+            raise bb.fetch2.ParameterError("Invalid URL: Must be crate://HOST/NAME/VERSION", ud.url)
+
+        # last field is version
+        version = parts[len(parts) - 1]
+        # second to last field is name
+        name = parts[len(parts) - 2]
+        # host (this is to allow custom crate registries to be specified
+        host = '/'.join(parts[2:len(parts) - 2])
+
+        # if using upstream just fix it up nicely
+        if host == 'crates.io':
+            host = 'crates.io/api/v1/crates'
+
+        ud.url = "https://%s/%s/%s/download" % (host, name, version)
+        ud.parm['downloadfilename'] = "%s-%s.crate" % (name, version)
+        ud.parm['name'] = name
+
+        logger.debug(2, "Fetching %s to %s" % (ud.url, ud.parm['downloadfilename']))
+
+    def unpack(self, ud, rootdir, d):
+        """
+        Uses the crate to build the necessary paths for cargo to utilize it
+        """
+        if ud.type == 'crate':
+            return self._crate_unpack(ud, rootdir, d)
+        else:
+            super(Crate, self).unpack(ud, rootdir, d)
+
+    def _crate_unpack(self, ud, rootdir, d):
+        """
+        Unpacks a crate
+        """
+        thefile = ud.localpath
+
+        # possible metadata we need to write out
+        metadata = {}
+
+        # change to the rootdir to unpack but save the old working dir
+        save_cwd = os.getcwd()
+        os.chdir(rootdir)
+
+        pn = d.getVar('BPN')
+        if pn == ud.parm.get('name'):
+            cmd = "tar -xz --no-same-owner -f %s" % thefile
+        else:
+            cargo_bitbake = self._cargo_bitbake_path(rootdir)
+
+            cmd = "tar -xz --no-same-owner -f %s -C %s" % (thefile, cargo_bitbake)
+
+            # ensure we've got these paths made
+            bb.utils.mkdirhier(cargo_bitbake)
+
+            # generate metadata necessary
+            with open(thefile, 'rb') as f:
+                # get the SHA256 of the original tarball
+                tarhash = hashlib.sha256(f.read()).hexdigest()
+
+            metadata['files'] = {}
+            metadata['package'] = tarhash
+
+        path = d.getVar('PATH')
+        if path:
+            cmd = "PATH=\"%s\" %s" % (path, cmd)
+        bb.note("Unpacking %s to %s/" % (thefile, os.getcwd()))
+
+        ret = subprocess.call(cmd, preexec_fn=subprocess_setup, shell=True)
+
+        os.chdir(save_cwd)
+
+        if ret != 0:
+            raise UnpackError("Unpack command %s failed with return value %s" % (cmd, ret), ud.url)
+
+        # if we have metadata to write out..
+        if len(metadata) > 0:
+            cratepath = os.path.splitext(os.path.basename(thefile))[0]
+            bbpath = self._cargo_bitbake_path(rootdir)
+            mdfile = '.cargo-checksum.json'
+            mdpath = os.path.join(bbpath, cratepath, mdfile)
+            with open(mdpath, "w") as f:
+                json.dump(metadata, f)