Make SED command work for any variable - linux

Question

deploy.sh
USERNAME="Tom"
PASSWORD="abc123"
FILE="config.conf"
sed -i "s/\PLACEHOLDER_USERNAME/$USERNAME/g" $FILE
sed -i "s/\PLACEHOLDER_PASSWORD/$PASSWORD/g" $FILE
config.conf
deloy="PLACEHOLDER_USERNAME"
pass="PLACEHOLDER_PASSWORD"
This file puts my variables defined in deploy into my config file. I can't source the file so I want put my variables in this way.
Question
I want a command that is generic to work for all placeholder variables using some sort of while loop rather than needing one command per variable. This means any term starting with placeholder_ in the file will try to be replaced with the value of the variable defined already in deploy.sh
All variables should be set and not empty. I guess if there is the ability to print a warning if it can't find the variable that would be good but it isn't mandatory for this.

Answer 1

Basically, use shell code to write a sed script and then use sed -i .bak -f sed.script config.conf to apply it:
trap "rm -f sed.script; exit 1" 0 1 2 3 13 15
for var in USERNAME PASSWORD
do
echo "s/PLACEHOLDER_$var/${!var}/"
done > sed.script
sed -i .bak -f sed.script config.conf
rm -f sed.script
trap 0
The main 'tricks' here are:
knowing that ${!var} expands to the value of the variable named by $var, and
knowing that sed will take a script full of commands via -f sed.script, and
knowing how to use trap to ensure temporary files are cleaned up.
You could also use sed -e "s/.../.../" -e "s/.../.../" -i .bak config.conf too, but the script file is easier, I think, especially if you have more than 2 values to substitute. If you want to go down this route, use a bash array to hold the arguments to sed. A more careful script would use at least $$ in the script file name, or use mktemp to create the temporary file.
Revised answer
The trouble is, although much closer to being generic, it is still not generic since I have to manually put in what variables I want to change. Can it not be more like "for each placeholder_, find the variable in deploy.sh and add that variable, so it can work for any number of variables.
So, find what the variables are in the configuration file, then apply the techniques of the previous answer to solve that problem:
trap "rm -f $tmp; exit 1" 0 1 2 3 13 15
for file in "$#"
do
for var in $(sed 's/.*PLACEHOLDER_\([A-Z0-9_]*\).*/\1/' "$file")
do
value="${!var}"
[ -z "$value" ] && { echo "$0: variable $var not set for $file" >&2; exit 1; }
echo "s/PLACEHOLDER_$var/$value/"
done > $tmp
sed -i .bak -f $tmp "$file"
rm -f $tmp
done
trap 0
This code still pulls the values from the environment. You need to clarify what is required if you want to extract the settings from the shell script, but it can be done — the script will have to be sufficiently self-aware to find its source so it can search it for the names. But the basics are in this answer; the rest is a question of tinkering until it does what you need.

Answer 2

#!/bin/ksh
TemplateFile=$1
SourceData=$2
(sed 's/.*/#V0r:PLACEHOLDER_&:r0V#/' ${SourceData}; cat ${TemplateFile}) | sed -n "
s/$/²/
H
$ {
x
s/^\(\n *\)*//
# also reset t flag
t varxs
:varxs
s/^#V0r:\([a-zA-Z0-9_]\{1,\}\)=\([^²]*\):r0V#²\(\n.*\)\"\1\"/#V0r:\1=\2:r0V#²\3\2/
t varxs
# clean the line when no more occurance in text
s/^[^²]*:r0V#²\n//
# and next
t varxs
# clean the marker
s/²\(\n\)/\1/g
s/²$//
# display the result
p
}
"
call like this: YourScript.ksh YourTemplateFile YourDataSourceFile where:
YourTemplateFile is the file that contain the structure with generic value like deloy="PLACEHOLDER_USERNAME"
YourDataSourceFile is the file that contain all the peer Generic value = specific value like USERNAME="Tom"