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