dpdk/SOURCES/configlib.sh
2021-09-09 16:11:22 +00:00

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# Copyright (C) 2017, Red Hat, Inc.
#
# Core configuration file library.
# Configurations are determined by sha values. The way to determine is by
# the special text:
# $FILE_COMMENT_TYPE -*- cfg-sha: $SHA256 -*-
export LC_ALL=C
# check required binaries
__check_reqd_binaries() {
local BIN __binaries=("egrep" "sort" "sha256sum" "sed")
for BIN in $__binaries; do
if ! type -P $BIN >/dev/null 2>&1; then
echo "Binary $BIN not found. Please install."
exit 1
fi
done
}
# Calculates a sha from a file
# The algorithm for generating a sha from a config is thus:
#
# 1. Remove all comment lines and blank lines
# 2. Sort the content
# 3. generate the sha-256 sum
#
# From a script perspective, this means:
# egrep -v ^\# %file% | egrep -v ^$ | sort -u | sha256sum
#
# Params:
# $1 = output variable
# $2 = file to use to calculate the shasum
# $3 = file comment type (defaults to # if unspecified)
calc_sha() {
__check_reqd_binaries
if [ "$1" == "" ]; then
echo "Please pass in a storage variable."
return 1
fi
local __resultvar=$1
__retval=1
shift
local __file=$1
local cmnt=${2:-#}
if [ -f "$__file" ]; then
local __shasum=$(egrep -v ^"$cmnt" "$__file" | egrep -v ^$ | sort -u | sha256sum -t | cut -d" " -f1)
eval $__resultvar="'$__shasum'"
__retval=0
fi
return $__retval
}
# Retrieves a sha stored in a file
# Param:
# $1 = output variable
# $2 = file to use to calculate the shasum
# $3 = file comment type (defaults to # if unspecified)
retr_sha() {
__check_reqd_binaries
if [ "$1" == "" ]; then
echo "Please pass in a storage variable."
return 1
fi
local __resultvar=$1
__retval=1
shift
local __file=$1
local cmnt=${2:-#}
if [ -f "$__file" ]; then
if grep -q "$cmnt -\*- cfg-sha:" "$__file"; then
local __shasum=$(grep "$cmnt -\*- cfg-sha:" "$__file" | sed -e "s@$cmnt -\*- cfg-sha: @@" | cut -d" " -f1)
eval $__resultvar="'$__shasum'"
__retval=0
fi
fi
return $__retval
}
# Set a config value
# set_conf dpdk_build_tree parameter value
# dpdk_build_tree is the directory where the .config lives
# parameter is the config parameter
# value is the value to set for the config parameter
set_conf() {
c="$1/.config"
shift
if grep -q "$1" "$c"; then
sed -i "s:^$1=.*$:$1=$2:g" $c
else
echo $1=$2 >> "$c"
fi
}