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nix-build: set execfail

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When starting a nix-shell with `-i` it was previously possible for it to
silently fail in the scenario where the specified interpreter didn't
exist. This happened due to the `exec` call masking the issue.

With this change we enable `execfail`, which causes the script using
`nix-shell` as interpreter to correctly exit with code 127.

Fixes: #4598
This commit is contained in:
Bernardo Meurer 2021-03-03 14:46:15 -08:00
parent 665d4ec2da
commit 6e849e3b0a
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src/nix-build/nix-build.cc
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@ -447,6 +447,7 @@ static void main_nix_build(int argc, char * * argv)
"unset NIX_ENFORCE_PURITY; " "unset NIX_ENFORCE_PURITY; "
"shopt -u nullglob; " "shopt -u nullglob; "
"unset TZ; %6%" "unset TZ; %6%"
"shopt -s execfail;"
"%7%", "%7%",
shellEscape(tmpDir), shellEscape(tmpDir),
(pure ? "" : "p=$PATH; "), (pure ? "" : "p=$PATH; "),