Maint: remove dead code from sconsign

The Utilities/sconsign.py code used to do its own importing of the
suitable module to read the sconsign file; for a while now it leaves that
to the sconsign module, but some remnants of the old code were still
present, which caused checkers and IDEs to grumble about usage of the
"imp" module, which is removed from Python as of 3.12.  Dropping this
(uncalled) code and associated comments quiets the grumbles.

Also tweaked manpage just a bit.

Signed-off-by: Mats Wichmann <[email protected]>

Author: mwichmann

CHANGES.txt

@@ -56,6 +56,7 @@ RELEASE  VERSION/DATE TO BE FILLED IN LATER
   From Mats Wichmann:
     - Add support for Python 3.13 (as of alpha 2). So far only affects
       expected bytecodes in ActionTests.py.
+    - sconsign cleanup - remove some dead code, minor manpage tweaks.
 
 
 RELEASE 4.6.0 -  Sun, 19 Nov 2023 17:22:20 -0700

SCons/Utilities/sconsign.py

@@ -51,24 +51,6 @@ def my_whichdb(filename):
     return whichdb(filename)
 
 
-def my_import(mname):
-    """Import database module.
-
-    This was used if the module was *not* SCons.dblite, to allow
-    for programmatic importing.  It is no longer used, in favor of
-    importlib.import_module, and will be removed eventually.
-    """
-    import imp
-
-    if '.' in mname:
-        i = mname.rfind('.')
-        parent = my_import(mname[:i])
-        fp, pathname, description = imp.find_module(mname[i+1:], parent.__path__)
-    else:
-        fp, pathname, description = imp.find_module(mname)
-    return imp.load_module(mname, fp, pathname, description)
-
-
 class Flagger:
     default_value = 1
 
@@ -449,8 +431,6 @@ def main() -> None:
 
                         dbm = SCons.dblite
                         # Ensure that we don't ignore corrupt DB files,
-                        # this was handled by calling my_import('SCons.dblite')
-                        # again in earlier versions...
                         SCons.dblite.IGNORE_CORRUPT_DBFILES = False
                 except ImportError:
                     sys.stderr.write("sconsign: illegal file format `%s'\n" % a)
@@ -492,8 +472,6 @@ def main() -> None:
 
                     dbm = SCons.dblite
                     # Ensure that we don't ignore corrupt DB files,
-                    # this was handled by calling my_import('SCons.dblite')
-                    # again in earlier versions...
                     SCons.dblite.IGNORE_CORRUPT_DBFILES = False
                 Do_SConsignDB(Map_Module.get(dbm_name, dbm_name), dbm)(a)
             else:

doc/man/sconsign.xml

@@ -1,29 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!--
-
-  __COPYRIGHT__
-
-  Permission is hereby granted, free of charge, to any person obtaining
-  a copy of this software and associated documentation files (the
-  "Software"), to deal in the Software without restriction, including
-  without limitation the rights to use, copy, modify, merge, publish,
-  distribute, sublicense, and/or sell copies of the Software, and to
-  permit persons to whom the Software is furnished to do so, subject to
-  the following conditions:
-
-  The above copyright notice and this permission notice shall be included
-  in all copies or substantial portions of the Software.
-
-  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
-  KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
-  WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+<!--
+SPDX-FileCopyrightText: Copyright The SCons Foundation (https://scons.org)
+SPDX-License-Identifier: MIT
 -->
 
+<!DOCTYPE reference [
+<!ENTITY % version SYSTEM "../version.xml">
+%version;
+<!ENTITY % scons SYSTEM '../scons.mod'>
+%scons;
+]>
+
 <refentry id='sconsign1'
           xmlns="http://www.scons.org/dbxsd/v1.0"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
@@ -48,12 +36,13 @@
 </refsynopsisdiv>
 
 
-<refsect1 id='description'><title>DESCRIPTION</title>
+<refsect1 id='description'>
+<title>DESCRIPTION</title>
 <para>
 Displays the contents of one or more
-<firstterm>sconsign files</firstterm>,
-the signature database files
-used by the <application>SCons</application> build tool.
+<firstterm>sconsign</firstterm> files,
+the signature/dependency database
+used by the &SCons; build tool.
 </para>
 
 <para>By default,
@@ -64,26 +53,34 @@ Without options,
 individual dependency entries are printed in the following format:</para>
 
 <screen>
-depfile: signature timestamp length
-        implicit_dependency_1: content_signature timestamp length
-        implicit_dependency_2: content_signature timestamp length
+depfile: csig timestamp length
+        implicit_dependency_1: csig timestamp length
+        implicit_dependency_2: csig timestamp length
         ...
-        action_signature [action string]
+        bactsig [action string]
 </screen>
 
-<para><emphasis role="bold">None</emphasis>
+<para>
+<emphasis role="bold">csig</emphasis>
+is the <firstterm>content signature</firstterm>,
+a hash of the file's contents.
+<emphasis role="bold">bactsig</emphasis>
+is the <firstterm>build action signature</firstterm>,
+a hash of the command line or other build action
+used to build a target.
+<emphasis role="bold">None</emphasis>
 is printed in place of any missing timestamp,
- <firstterm>content signature</firstterm>
-(<emphasis role="bold">csig</emphasis>)
-or
-<firstterm>build action signature</firstterm>
+<emphasis role="bold">csig</emphasis>,
+or <emphasis role="bold">bactsig</emphasis>
 values for any entry
 or any of its dependencies.
 If the entry has no implicit dependencies,
 or no build action,
-those lines are omitted.</para>
+the corresponding lines are omitted.
+</para>
 
-<para>By default,
+<para>
+By default,
 <command>sconsign</command>
 assumes that any
 <replaceable>file</replaceable>
@@ -92,14 +89,13 @@ arguments that end with a
 suffix contains
 signature entries for
 more than one directory
-(that is,
-was specified by the
+(that is, was specified by the
 <function>SConsignFile</function>
-function).
+&SCons; function).
 Any
 <replaceable>file</replaceable>
 argument that has no suffix
-is assumed to be an old-style
+is assumed to be an old-style (deprecated)
 sconsign file containing the signature entries
 for a single directory.
 If neither of those is true,
@@ -299,7 +295,8 @@ for all entries or the specified entries.</para>
 <refsect1 id='see_also'>
 <title>SEE ALSO</title>
 <para>
-<command>scons</command>,
+The &SCons; reference (manpage) at
+<ulink url="https://scons.org/doc/production/HTML/scons-man.html"/>,
 the SCons User Guide at
 <ulink url="https://scons.org/doc/production/HTML/scons-user.html"/>,
 the SCons source code