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For tests with options not compatible with the default bootstrapped datadir, MTR performs local rebootstrap, without touching the clean install.db.
While doing so, MTR modifies MYSQLD_BOOTSTRAP_CMD environment variable. It shouldn't be happening, the variable should remain the same as it was initially, to avoid dependency on the sequence of tests. If a test uses the variable and needs it to be modified, it should be done explicitly in the test itself.
--- /data/src/10.4/mysql-test/mysql-test-run.pl 2020-04-23 01:23:11.583215104 +0300
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+++ mysql-test-run.pl 2020-04-23 04:31:16.384303120 +0300
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@@ -3369,7 +3369,8 @@
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# ----------------------------------------------------------------------
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# export MYSQLD_BOOTSTRAP_CMD variable containing <path>/mysqld <args>
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# ----------------------------------------------------------------------
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- $ENV{'MYSQLD_BOOTSTRAP_CMD'}= "$exe_mysqld_bootstrap " . join(" ", @$args);
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+ $ENV{'MYSQLD_BOOTSTRAP_CMD'}= "$exe_mysqld_bootstrap " . join(" ", @$args)
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+ unless defined $ENV{'MYSQLD_BOOTSTRAP_CMD'};
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# Extra options can come not only from the command line, but also
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# from option files or combinations. We want them on a command line
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