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Temporarily disable the debugger during completion evaluation

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readline is not re-entrant, so entering the debugger from the
completioncallback results in an eventual segfault.

The workaround is to temporarily disable the debugger when searching
for possible completions.
This commit is contained in:
Yorick van Pelt 2022-10-05 12:09:57 +02:00
parent 0edba4cc1e
commit 444af85552
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1 changed files with 4 additions and 0 deletions
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4
src/libcmd/repl.cc
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@ -384,6 +384,10 @@ StringSet NixRepl::completePrefix(const std::string & prefix)
i++; i++;
} }
} else { } else {
/* Temporarily disable the debugger, to avoid re-entering readline. */
auto debug_repl = state->debugRepl;
state->debugRepl = nullptr;
Finally restoreDebug([&]() { state->debugRepl = debug_repl; });
try { try {
/* This is an expression that should evaluate to an /* This is an expression that should evaluate to an
attribute set. Evaluate it to get the names of the attribute set. Evaluate it to get the names of the