Shell command to update pom file from a variable

Question

Previously I used below command to take the version in pom.xml and increment it from one. Before increment snapshot version is, 0.0.1

#!/bin/bash

version=$(grep -ri "<version>" pom.xml |head -n 1 | sed -e 's/^[ \t]* 
<version>\([^<]*\)<.*$/\1/' | sed 's/[-SNAPSHOT]//g')
var1=$(echo $version | cut -c1)
var2=$(echo $version | cut -c2)
var3=$(echo $version | cut -c3)
var4=$(echo $version | cut -c4)
var5=$(echo $version | cut -c5)
var5=$((var5+1))
incrementVer=$var1$var2$var3$var4$var5
echo $incrementVer

output is 0.0.2

But I want to push this output into pom file and update as, <version>0.0.2</version>

Can I use sed command to update pom file?

My pom file looks like this,

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>
<groupId>com.mss.inven</groupId>
<artifactId>INVEN</artifactId>
<version>0.0.1-SNAPSHOT</version>

Answer 1

The simple solution to set the version to a particular value via versions-maven-plugin

mvn versions:set -DnewVersions=0.0.1

If you like to increment it. This could be achieved by using by build-helper-maven-pugin like the following:

mvn build-helper:parse-version versions:set \
     -DnewVersion=\${parsedVersion.nextMajorVersion}.0.0 \
     versions:commit

or if you like to increment the minor version:

mvn build-helper:parse-version versions:set \
 -DnewVersion=\${parsedVersion.majorVersion}.\${parsedVersion.nextMinorVersion}.0 \
 versions:commit

or if you like to increment the patch version:

mvn build-helper:parse-version versions:set \
 -DnewVersion=\${parsedVersion.majorVersion}.\${parsedVersion.minorVersion}.\${parsedVersion.nextIncrementalVersion} \
 versions:commit

You need to pay attention to quoting which is needed on Windows/Linux.

or you can use maven-release-plugin which will increment the current version to the next one by just calling:

mvn -B release:update-versions

Or you you the maven-release-plugin via the usual release process by mvn release:prepare release:perform which by default increments the version also.

Answer 2

In here I mention fully working command. Thank you for your support.

#!/bin/bash

version=$(grep -ri "<version>" pom.xml |head -n 1 | sed -e 's/^[ \t]*<version>\ 
([^<]*\)<.*$/\1/')

major=$(echo $version | cut -c1)
var2=$(echo $version | cut -c2)
miner=$(echo $version | cut -c3)
var4=$(echo $version | cut -c4)
bug=$(echo $version | cut -c5)
bug=$((bug+1))
str="-SNAPSHOT"
incrementVer=$major$var2$miner$var4$bug$str
echo $incrementVer

LN=$(grep -n "<version>" pom.xml | head -1 | awk -F ":" '{print $1}')
sed -i "$LN s/$version/$incrementVer/" pom.xml

Answer 3

Use an XML-aware tool. For example, in xsh you can write

open pom.xml ;
register-namespace m http://maven.apache.org/POM/4.0.0 ;
for //m:version
    set . xsh:subst(., '(?<=\.)([0-9]+)$', '$1+1', 'e') ;
save :b ;

Which changes "0.0.1" to "0.0.2".

To also increment the version if -SNAPSHOT is present, the regular expression becomes a bit more complex:

xsh:subst(., '(?<=\.)([0-9]+)(?=$|-SNAPSHOT$)', '$1+1', 'e') ;
              ^         ^          ^              ^      ^
              |         |          |              |      |
              |         |      Followed by        |  Evaluate replacement
         Preceded       |      end of string      |  as code
         by a dot   At least   or -SNAPSHOT plus  |
                    one digit  end of string     Add one
                                                 to the 1st
                                                 capture group

Answer 4

I can use maven plugin to do above increment. But the thing is my mentor has been instructed me to get it by using shell commands for practice shell scripting. I highly appreciate your support. Somehow I solved my question using below commands.

#!/bin/bash

cd Project/

version=$(grep -ri "<version>" pom.xml |head -n 1 | sed -e 's/^[ \t]*<version>\ 
([^<]*\)<.*$/\1/')

major=$(echo $version | cut -c1)
var2=$(echo $version | cut -c2)
miner=$(echo $version | cut -c3)
var4=$(echo $version | cut -c4)
bug=$(echo $version | cut -c5)
bug=$((bug+1))
str="-SNAPSHOT"
incrementVer=$major$var2$miner$var4$bug$str
echo $incrementVer

pomChange=$(grep -ri "<version>" pom.xml | head -n 1 | sed -i "s/\(<version>\)[^<]*\ 
(<\/version>\)/\1$incrementVer\2/" pom.xml)
echo $pomChange

Output looks like,

[INFO] ------------------------------------------------------------------- 
[INFO] BUILD SUCCESS
[INFO] --------------------------------------------------------------------- 
[INFO] Total time: 4.087s
[INFO] Finished at: Wed Oct 31 00:25:40 IST 2018
[INFO] Final Memory: 6M/17M
[INFO] --------------------------------------------------------------------
0.0.2-SNAPSHOT
Finished: SUCCESS

Answer 5

Yes you can use sed to modify the version in pom.xml file. Simply add, at the end of your given bash script, those two lines:

LN=$(grep -n "<version>" pom.xml | head -1 | awk -F ":" '{print $1}')
sed -i "$LN s/$version/$incrementVer/" pom.xml

Explanation:

• The first line recover the line number of the project version (in LN var)
• The second modify in place (-i parameter of sed) the pom file with new version value.

Answer 6

Looks like you want to edit the pom.xml in the backend. Try the Perl one-liner. Check this out.

> cat pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>
<groupId>com.mss.inven</groupId>
<artifactId>INVEN</artifactId>
<version>0.0.1-SNAPSHOT</version>

> perl -ne ' { s/(.*)\.(\d+)(-SNAPSHOT.*)/printf("%s.%d%s",$1,$2+1,$3)/ge and $_=~s/.$//g if /<version>/; print } ' pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>
<groupId>com.mss.inven</groupId>
<artifactId>INVEN</artifactId>
<version>0.0.2-SNAPSHOT</version>

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