bitbake: bitbake-diffsigs: fix walking the task dependencies and show better error

* when comparing 2 tmp/stamps/*do_configure.sigdata* I got
  TypeError("filename must be a str or bytes object, or a file")
  but both files I was comparing were
  Zstandard compressed data (v0.8+), Dictionary ID: None
  according to "file"

  with TypeError catched to show which file it failed to open I got better
  error which shows it was trying to read "do_prepare_recipe_sysroot.sigdata"
  file now and after a while you might notice that it's not just the expected
  file, but a dict with 'path', 'sstate', 'time'.

  Fix that in bitbake-diffsigs but keep the TypeError and add OSError
  in case it will eventually walk on file which isn't zstd compressed
  pipecompress throws CompressionError.

ERROR: Failed to open {'path': '5.15.do_prepare_recipe_sysroot.sigdata.99b12a401341a0df7c3553cb00c87a7674295496bd5c25ed71764ee0d0fb8eb8', 'sstate': False, 'time': 1707136354.991718}: filename must be a str or bytes object, or a file
Traceback (most recent call last):
  File "bitbake/bin/bitbake-diffsigs", line 192, in <module>
    output = bb.siggen.compare_sigfiles(options.sigdatafile1, options.sigdatafile2, recursecb, color=color)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "bitbake/lib/bb/siggen.py", line 1039, in compare_sigfiles
    recout = recursecb(dep, a[dep], b[dep])
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "bitbake/bin/bitbake-diffsigs", line 102, in recursecb
    out2 = bb.siggen.compare_sigfiles(hashfiles[hash1], hashfiles[hash2], recursecb, color=color)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "bitbake/lib/bb/siggen.py", line 857, in compare_sigfiles
    raise err
  File "bitbake/lib/bb/siggen.py", line 853, in compare_sigfiles
    with bb.compress.zstd.open(a, "rt", encoding="utf-8", num_threads=1) as f:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "bitbake/lib/bb/compress/zstd.py", line 12, in open
    return bb.compress._pipecompress.open_wrap(ZstdFile, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "bitbake/lib/bb/compress/_pipecompress.py", line 59, in open_wrap
    raise TypeError("filename must be a str or bytes object, or a file")
TypeError: filename must be a str or bytes object, or a file

* if I replace zstd file with just plaintext it fails with:
  $ echo foo > foo
  $ echo foo > bar
  $ bitbake-diffsigs foo bar
  zstd: /*stdin*\: unsupported format
  ERROR: Process died with 1
  sys:1: ResourceWarning: unclosed file <_io.BufferedReader name='foo'>

  with this change it shows the name of the file which it failed to uncompress:

  $ bitbake-diffsigs foo bar
  zstd: /*stdin*\: unsupported format
  ERROR: Failed to open sigdata file 'foo': Process died with 1
  ERROR: Process died with 1
  sys:1: ResourceWarning: unclosed file <_io.BufferedReader name='foo'>

(Bitbake rev: f3f843a4fd6e0a9e8f6edef5dd3cf1fce29c50ba)

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

bitbake/bin/bitbake-diffsigs

@@ -99,7 +99,7 @@ def recursecb(key, hash1, hash2):
     elif hash2 not in hashfiles:
         recout.append("Unable to find matching sigdata for %s with hash %s" % (key, hash2))
     else:
-        out2 = bb.siggen.compare_sigfiles(hashfiles[hash1], hashfiles[hash2], recursecb, color=color)
+        out2 = bb.siggen.compare_sigfiles(hashfiles[hash1]['path'], hashfiles[hash2]['path'], recursecb, color=color)
         for change in out2:
             for line in change.splitlines():
                 recout.append('    ' + line)

bitbake/lib/bb/siggen.py

@@ -849,10 +849,18 @@ def compare_sigfiles(a, b, recursecb=None, color=False, collapsed=False):
         formatparams.update(values)
         return formatstr.format(**formatparams)
 
-    with bb.compress.zstd.open(a, "rt", encoding="utf-8", num_threads=1) as f:
-        a_data = json.load(f, object_hook=SetDecoder)
-    with bb.compress.zstd.open(b, "rt", encoding="utf-8", num_threads=1) as f:
-        b_data = json.load(f, object_hook=SetDecoder)
+    try:
+        with bb.compress.zstd.open(a, "rt", encoding="utf-8", num_threads=1) as f:
+            a_data = json.load(f, object_hook=SetDecoder)
+    except (TypeError, OSError) as err:
+        bb.error("Failed to open sigdata file '%s': %s" % (a, str(err)))
+        raise err
+    try:
+        with bb.compress.zstd.open(b, "rt", encoding="utf-8", num_threads=1) as f:
+            b_data = json.load(f, object_hook=SetDecoder)
+    except (TypeError, OSError) as err:
+        bb.error("Failed to open sigdata file '%s': %s" % (b, str(err)))
+        raise err
 
     for data in [a_data, b_data]:
         handle_renames(data)
@@ -1090,8 +1098,12 @@ def calc_taskhash(sigdata):
 def dump_sigfile(a):
     output = []
 
-    with bb.compress.zstd.open(a, "rt", encoding="utf-8", num_threads=1) as f:
-        a_data = json.load(f, object_hook=SetDecoder)
+    try:
+        with bb.compress.zstd.open(a, "rt", encoding="utf-8", num_threads=1) as f:
+            a_data = json.load(f, object_hook=SetDecoder)
+    except (TypeError, OSError) as err:
+        bb.error("Failed to open sigdata file '%s': %s" % (a, str(err)))
+        raise err
 
     handle_renames(a_data)