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MDEV-25669: SST scripts should check all server groups in config files

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1) This commit implements reading all sections from configuration
files while looking for the current value of any server variable,
which were previously only read from the [mysqld.suffix] group and
from [mysqld], but not from other groups such as [mariadb.suffix],
[mariadb] or, for example, [server].

2) This commit also fixes misrecognition of some parameters when
parsing a command line containing a special marker for the end
of the list of options ("--") or when short option names (such
as "-s", "-a" and "-h arg") chained together (like a "-sah arg").
Such parameters can be passed to the SST script in the list of
arguments after "--mysqld-args" if the server is started with a
complex set of options - this was revealed during manual testing
of changes to read configuration files.

3) The server-side preparation code for the "--mysqld-args"
option list has also been simplified to make it easier to change
in the future (if needed), and has been improved to properly
handle the special backquote ("`") character in the argument
values.
This commit is contained in:
Julius Goryavsky
2021-05-14 12:51:36 +02:00
parent 4675febb7a
commit 6811ed3e10
6 changed files with 217 additions and 212 deletions
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159
scripts/wsrep_sst_common.sh Normal file → Executable file
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@ -240,44 +240,108 @@ case "$1" in
original_cmd=""
shift
while [ $# -gt 0 ]; do
# check if the argument is the short option
# (starting with "-" instead of "--"):
if [ "${1#--}" = "$1" -a "${1#-}" != "$1" ]; then
option="${1#-}"
value=""
# check that the option value follows the name,
# without a space:
if [ ${#option} -gt 1 ]; then
# let's separate the first character as the option name,
# and the subsequent characters consider its value:
value="${1#-?}"
option="${1%$value}"
# check that the option name consists of one letter
# and there are the following arguments:
elif [ ${#option} -eq 1 -a $# -gt 1 ]; then
# if the next argument does not start with a "-" character,
# then this is the value of the current option:
if [ "${2#-}" = "$2" ]; then
value="$2"
lname="${1#--}"
# "--" is interpreted as the end of the list of options:
if [ -z "$lname" ]; then
shift
if [ $# -gt 0 ]; then
# copy "--" to the output string:
original_cmd="$original_cmd --"
# All other arguments must be copied unchanged:
while [ $# -gt 0 ]; do
original_cmd="$original_cmd '$1'"
shift
done
fi
break;
fi
# Make sure the argument does not start with "--", otherwise it
# is a long option, which is processed after this "if":
if [ "$lname" = "$1" ]; then
# Check if the argument is the short option or the short
# options list, starting with "-":
options="${1#-}"
if [ "$options" != "$1" -a -n "$options" ]; then
slist=""
while [ -n "$options" ]; do
# Let's separate the first character as the current
# option name:
if [ -n "$BASH_VERSION" ]; then
option="${options:0:1}"
else
# If it's not bash, then we need to use slow
# external utilities:
option=$(echo "$options" | cut -c1-1)
fi
# And the subsequent characters consider option value:
value=""
if [ ${#options} -gt 0 ]; then
value="${options#?}"
fi
# Check for options without argument:
if [ "$option" != '?' -a \
"$option" != 'a' -a \
"$option" != 's' -a \
"$option" != 'v' ]
then
# If the option value is absent, then check
# the following argument:
if [ -z "$value" -a $# -gt 1 ]; then
# if the next argument does not start with
# the "-" character, then next argument is
# the current option value:
if [ "${2#-}" = "$2" ]; then
shift
value="$1"
fi
fi
if [ $option == 'h' ]; then
if [ -z "$WSREP_SST_OPT_DATA" ]; then
MYSQLD_OPT_DATADIR="${value%/}"
fi
elif [ $option != 'u' -a \
$option != 'P' ]
then
if [ -z "$value" ]; then
slist="$slist$option"
elif [ -z "$slist" ]; then
slist="$option '$value'"
else
slist="$slist -$option '$value'"
fi
fi
break
else
slist="$slist$option"
fi
options="$value"
done
if [ -n "$slist" ]; then
original_cmd="$original_cmd -$slist"
fi
elif [ -z "$options" ]; then
# We found an equal sign without any characters after it:
original_cmd="$original_cmd -"
else
# We found a value that does not start with a minus -
# it is a positional argument or the value of previous
# option. Copy it to output string (as is):
original_cmd="$original_cmd '$1'"
fi
shift
if [ "$option" = 'h' ]; then
if [ -z "$WSREP_SST_OPT_DATA" ]; then
MYSQLD_OPT_DATADIR="${value%/}"
fi
elif [ "$option" != 'u' -a \
"$option" != 'P' ]; then
if [ -z "$original_cmd" ]; then
original_cmd="'-$option$value'"
else
original_cmd="$original_cmd '-$option$value'"
fi
fi
continue;
fi
# Now we are sure that we are working with an option
# that has a "long" name, so remove all characters after
# the first equal sign:
option="${1%%=*}"
# The "--loose-" prefix should not affect the recognition
# of the option name:
if [ "${option#--loose-}" != "$option" ]; then
option="--${option#--loose-}"
fi
# Some options just need to be removed from the list:
if [ "$option" != '--defaults-file' -a \
"$option" != '--defaults-extra-file' -a \
"$option" != '--defaults-group-suffix' -a \
@ -340,22 +404,17 @@ case "$1" in
;;
esac
if [ $skip_mysqld_arg -eq 0 ]; then
if [ -z "$original_cmd" ]; then
original_cmd="'$1'"
else
original_cmd="$original_cmd '$1'"
fi
original_cmd="$original_cmd '$1'"
fi
fi
shift
fi
shift
done
WSREP_SST_OPT_MYSQLD="$original_cmd"
WSREP_SST_OPT_MYSQLD="${original_cmd# *}"
break
;;
*) # must be command
# usage
# exit 1
;;
*) # Must be command usage
# exit 1
;;
esac
shift
done
@ -601,9 +660,9 @@ parse_cnf()
# of the groups list (as if it were a prefix):
groups="${groups#$group}"
groups="${groups#\|}"
# if the group name is the same as the "[--]mysqld", then
# try to use it together with the group suffix:
if [ "${group#--}" = 'mysqld' -a -n "$WSREP_SST_OPT_SUFFIX_VALUE" ]; then
# If the group name is the same as the "mysqld" without "--" prefix,
# then try to use it together with the group suffix:
if [ "$group" = 'mysqld' -a -n "$WSREP_SST_OPT_SUFFIX_VALUE" ]; then
reval=$($MY_PRINT_DEFAULTS "mysqld$WSREP_SST_OPT_SUFFIX_VALUE" | awk "$pattern")
if [ -n "$reval" ]; then
break
@ -616,7 +675,7 @@ parse_cnf()
fi
done
# use default if we haven't found a value:
# Use default if we haven't found a value:
if [ -z "$reval" ]; then
[ -n "${3:-}" ] && reval="$3"
fi
@ -648,9 +707,9 @@ in_config()
# of the groups list (as if it were a prefix):
groups="${groups#$group}"
groups="${groups#\|}"
# if the group name is the same as the "[--]mysqld", then
# try to use it together with the group suffix:
if [ "${group#--}" = 'mysqld' -a -n "$WSREP_SST_OPT_SUFFIX_VALUE" ]; then
# If the group name is the same as the "mysqld" without "--" prefix,
# then try to use it together with the group suffix:
if [ "$group" = 'mysqld' -a -n "$WSREP_SST_OPT_SUFFIX_VALUE" ]; then
found=$($MY_PRINT_DEFAULTS "mysqld$WSREP_SST_OPT_SUFFIX_VALUE" | awk "$pattern")
if [ $found -ne 0 ]; then
break