bitbake: fetch2/wget: Canonicalize DL_DIR paths for wget2 compatibility

Some distributions (namely Fedora Core 40) have started replacing
wget with wget2. There are some changes to wget2 that make it
incompatible with wget:

1. ftp/ftps is not supported anymore
2. progress 'dot' is not yet supported
3. Relative paths in -P and -O are not correctly dealt with

Item 1: Is already dealt with since Scarthgap by only adding the
option --passive-ftp when the URL specifies ftp/sftp. While that
won't help if ftp/sftp is actually required it at least does
not break http/https downloads.

Item 2: While not supported it at least does not break the operation.

Item 3: If there are relative path components in -P or -O then wget2
only deals with them correctly if there is one, and only one, relative
path component at the beginning of the path:

-P ./downloads     works
-P ../downloads    works
-P ../../downloads does not work
-P ./../downloads  does not work
-P /home/user/downloads/../downloads does not work

In cases where there are more than one relative path component at
the beginning of the path and/or one or more reltaive path
component somewhere in the middle or end of the path, wget2 aborts
with the message Internal error: Unexpected relative path: '<path>')

Such can happen if DL_DIR includes relative path components e.g.
DL_DIR = "${TOPDIR}/../../downloads".

This patch canonicalizes DL_DIR before it is passed to wget.

(Bitbake rev: 3e4208952b086adc510e78c1c5f9cf4550d79dc9)

Signed-off-by: Rudolf J Streif <rudolf.streif@ibeeto.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/wget.py

@@ -108,7 +108,8 @@ class Wget(FetchMethod):
 
         fetchcmd = self.basecmd
 
-        localpath = os.path.join(d.getVar("DL_DIR"), ud.localfile) + ".tmp"
+        dldir = os.path.realpath(d.getVar("DL_DIR"))
+        localpath = os.path.join(dldir, ud.localfile) + ".tmp"
         bb.utils.mkdirhier(os.path.dirname(localpath))
         fetchcmd += " -O %s" % shlex.quote(localpath)
 
@@ -128,9 +129,9 @@ class Wget(FetchMethod):
         uri = ud.url.split(";")[0]
         if os.path.exists(ud.localpath):
             # file exists, but we didnt complete it.. trying again..
-            fetchcmd += d.expand(" -c -P ${DL_DIR} '%s'" % uri)
+            fetchcmd += " -c -P " + dldir + " '" + uri + "'"
         else:
-            fetchcmd += d.expand(" -P ${DL_DIR} '%s'" % uri)
+            fetchcmd += " -P " + dldir + " '" + uri + "'"
 
         self._runwget(ud, d, fetchcmd, False)