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From 6303448af77d2ed64c7436a84b30cf7fa4941e19 Mon Sep 17 00:00:00 2001
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From: Michele Baldessari <michele@acksyn.org>
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Date: Wed, 30 Jan 2019 21:36:17 +0100
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Subject: [PATCH] redis: Filter warning from stderr when calling 'redis-cli -a'
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In some versions of redis (starting with 4.0.10) we have commits [1] and
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[2] which add a warning on stderr which will be printed out every single
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time a monitor operation takes place:
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foo pacemaker-remoted[57563]: notice: redis_monitor_20000:1930:stderr
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[ Warning: Using a password with '-a' option on the command line interface may not be safe. ]
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Later on commit [3] (merged with 5.0rc4) was merged which added the option
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'--no-auth-warning' to disable said warning since it broke a bunch of
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scripts [4]. I tried to forcibly either try the command twice (first
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with --no-auth-warning and then without in case of errors) but it is
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impossible to distinguish between error due to missing param and other
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errors.
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So instead of inspecting the version of the redis-cli tool and do the following:
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- >= 5.0.0 use --no-auth-warning all the time
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- >= 4.0.10 & < 5.0.0 filter the problematic line from stderr only
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- else do it like before
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We simply filter out from stderr the 'Using a password' message
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unconditionally while making sure we keep stdout just the same.
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Tested on a redis 4.0.10 cluster and confirmed that it is working as
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intended.
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All this horror and pain is due to the fact that redis does not support
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any other means to pass a password (we could in theory first connect to
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the server and then issue an AUTH command, but that seems even more
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complex and error prone). See [5] for more info (or [6] for extra fun)
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[1] https://github.com/antirez/redis/commit/c082221aefbb2a472c7193dbdbb90900256ce1a2
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[2] https://github.com/antirez/redis/commit/ef931ef93e909b4f504e8c6fbed350ed70c1c67c
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[3] https://github.com/antirez/redis/commit/a4ef94d2f71a32f73ce4ebf154580307a144b48f
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[4] https://github.com/antirez/redis/issues/5073
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[5] https://github.com/antirez/redis/issues/3483
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[6] https://github.com/antirez/redis/pull/2413
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Signed-off-by: Michele Baldessari <michele@acksyn.org>
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---
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heartbeat/redis.in | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/heartbeat/redis.in b/heartbeat/redis.in
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index 1dff067e9..e257bcc5e 100644
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--- a/heartbeat/redis.in
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+++ b/heartbeat/redis.in
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@@ -302,7 +302,9 @@ set_score()
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redis_client() {
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ocf_log debug "redis_client: '$REDIS_CLIENT' -s '$REDIS_SOCKET' $*"
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if [ -n "$clientpasswd" ]; then
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- "$REDIS_CLIENT" -s "$REDIS_SOCKET" -a "$clientpasswd" "$@" | sed 's/\r//'
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+ # Starting with 4.0.10 there is a warning on stderr when using a pass
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+ # Once we stop supporting versions < 5.0.0 we can add --no-auth-warning here
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+ ("$REDIS_CLIENT" -s "$REDIS_SOCKET" -a "$clientpasswd" "$@" 2>&1 >&3 3>&- | grep -v "Using a password" >&2 3>&-) 3>&1 | sed 's/\r//'
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else
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"$REDIS_CLIENT" -s "$REDIS_SOCKET" "$@" | sed 's/\r//'
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fi
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