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Fix pg_rewind when pg_xlog is a symlink.

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pg_xlog is often a symlink, typically to a different filesystem. Don't
get confused and comlain about by that, and just always pretend that it's a
normal directory, even if it's really a symlink.

Also add a test case for this.

Backpatch to 9.5.
This commit is contained in:
Heikki Linnakangas
2015-08-03 15:32:06 +03:00
parent 69b7a35c9a
commit 0e42397f42
6 changed files with 107 additions and 5 deletions
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14
src/bin/pg_rewind/RewindTest.pm
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@ -13,16 +13,18 @@ package RewindTest;
#
# 2. setup_cluster - creates a PostgreSQL cluster that runs as the master
#
# 3. create_standby - runs pg_basebackup to initialize a standby server, and
# 3. start_master - starts the master server
#
# 4. create_standby - runs pg_basebackup to initialize a standby server, and
# sets it up to follow the master.
#
# 4. promote_standby - runs "pg_ctl promote" to promote the standby server.
# 5. promote_standby - runs "pg_ctl promote" to promote the standby server.
# The old master keeps running.
#
# 5. run_pg_rewind - stops the old master (if it's still running) and runs
# 6. run_pg_rewind - stops the old master (if it's still running) and runs
# pg_rewind to synchronize it with the now-promoted standby server.
#
# 6. clean_rewind_test - stops both servers used in the test, if they're
# 7. clean_rewind_test - stops both servers used in the test, if they're
# still running.
#
# The test script can use the helper functions master_psql and standby_psql
@ -56,6 +58,7 @@ our @EXPORT = qw(
init_rewind_test
setup_cluster
start_master
create_standby
promote_standby
run_pg_rewind
@ -182,7 +185,10 @@ max_connections = 10
# Accept replication connections on master
configure_hba_for_replication $test_master_datadir;
}
sub start_master
{
system_or_bail('pg_ctl' , '-w',
'-D' , $test_master_datadir,
'-l', "$log_path/master.log",