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bpo-45395: Make custom frozen modules additions instead of replacements. (gh-28778)

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Currently custom modules (the array set on PyImport_FrozenModules) replace all the frozen stdlib modules. That can be problematic and is unlikely to be what the user wants. This change treats the custom frozen modules as additions instead. They take precedence over all other frozen modules except for those needed to bootstrap the import system. If the "code" field of an entry in the custom array is NULL then that frozen module is treated as disabled, which allows a custom entry to disable a frozen stdlib module.

This change allows us to get rid of is_essential_frozen_module() and simplifies the logic for which frozen modules should be ignored.

https://bugs.python.org/issue45395
This commit is contained in:
Eric Snow 2021-10-28 15:04:33 -06:00 • committed by GitHub
parent 66e6b3dcd3
commit 074fa57506
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GPG key ID: 4AEE18F83AFDEB23
10 changed files with 219 additions and 129 deletions
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10
Programs/_freeze_module.c
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@ -23,13 +23,16 @@
of frozen modules instead, left deliberately blank so as to avoid
unintentional import of a stale version of _frozen_importlib. */
static const struct _frozen _PyImport_FrozenModules[] = {
static const struct _frozen no_modules[] = {
{0, 0, 0} /* sentinel */
};
static const struct _module_alias aliases[] = {
{0, 0} /* sentinel */
};
const struct _frozen *_PyImport_FrozenBootstrap;
const struct _frozen *_PyImport_FrozenStdlib;
const struct _frozen *_PyImport_FrozenTest;
const struct _frozen *PyImport_FrozenModules;
const struct _module_alias *_PyImport_FrozenAliases;
@ -188,7 +191,10 @@ main(int argc, char *argv[])
{
const char *name, *inpath, *outpath;
PyImport_FrozenModules = _PyImport_FrozenModules;
_PyImport_FrozenBootstrap = no_modules;
_PyImport_FrozenStdlib = no_modules;
_PyImport_FrozenTest = no_modules;
PyImport_FrozenModules = NULL;
_PyImport_FrozenAliases = aliases;
if (argc != 4) {