Ludovic Courtès ee3226e9d5
substitute: Ensure backtraces go to file descriptor 4.
Fixes <https://bugs.gnu.org/46362>.
Reported by Zhu Zihao <all_but_last@163.com>.

Previously, backtraces due to uncaught exceptions would always to go
file descriptor 2; the daemon would read it and error out with something
like:

  error: got unexpected path `Backtrace:' from substituter

This patch fixes that by ensuring backtraces are properly displayed on
file descriptor 4.

* guix/scripts/substitute.scm (with-redirected-error-port): New macro.
(guix-substitute): Use 'with-redirected-error-port' instead of 'parameterize'.
2021-02-24 23:44:10 +01:00
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