bash 腳本編程十四 maven自動部署

和Java自動部署的思路一樣，通過在/usr/bin下建立mvn鏈接，指向/etc/alternatives/mvn鏈接，/etc/alternatives/mvn指向/usr/mvn3鏈接，/usr/mvn3鏈接指向/usr/apache-maven-3.0.4目錄。

由於maven運行是要檢查JAVA_HOME環境變量，而JAVA_HOME環境變量的設置可以放在安裝Java的腳本中執行。

現在看一下maven的安裝腳本install.sh

1. #!/bin/bash
3. source check.sh
4. source ../common/tool.sh
6. hasMaven
7. r=$?
9. SRC_MAVEN_FILES=./apache-maven-3.0.4
10. DST_MAVEN_FILES=/usr/apache-maven-3.0.4
11. #!/bin/bash
13. source /etc/environment
15. if [ $r -eq 1 ]
16. then
17. echo "maven was installed"
18. else
19. echo "maven was not installed"
20. copyFolder $SRC_MAVEN_FILES $DST_MAVEN_FILES
21. createLink $DST_MAVEN_FILES /usr/mvn3
22. createLink '/usr/mvn3/bin/mvn' '/etc/alternatives/mvn'
24. createLink /etc/alternatives/mvn /usr/bin/mvn
25. fi

tool.sh腳本位於common目錄裡面。整個自動化部署的目錄結構如下：

1. chenshu@sloop2:~/work/189/appengine/deploy$ tree -L 2
2. .
3. ├── common
4. │ └── tool.sh
5. ├── java
6. │ ├── check.sh
7. │ ├── install.sh
8. │ ├── jdk1.6.0_35
9. │ └── readme
10. ├── maven
11. │ ├── apache-maven-3.0.4
12. │ ├── check.sh
13. │ └── install.sh
14. └── readme

以後還會增加其他的子項目，比如mysql, glassfish, mongodb, nginx，或許有天我會將之建立一個開源項目。 :)

tool.sh腳本如下：

1. #!/bin/bash
3. function copyFolder {
5. if [ -d "$2" ]
6. then
7. echo "$2 folder exists already, stop copying."
8. else
9. echo "$2 folder doesn't exists, start copying..."
10. cp -r $1 $2
11. fi
12. }
14. #create a link($2) to file($1)
15. function createLink {
17. if [ -f "$2" ]
18. then
19. echo "$2 link exists already, removing it..."
20. rm $2
21. else
22. echo "$2 link doesn't exists, creating it..."
23. fi
24. echo "creating link: $2 to $1"
25. ln -s $1 $2
26. }
28. # $1 variable name
29. # $2 expected value
30. # put this into /etc/environment if not found
31. function setEnv {
32. source /etc/environment
33. if [ "${!1}" = "$2" ]
34. then
35. echo "$1 is correct: $2"
36. else
37. echo "$1 is wrong: ${!1} != $2"
39. h=`grep "$1=\"$2\"" /etc/environment`
40. if [ -n "$h" ]
41. then
42. echo "/etc/environment has $1 already"
43. else
44. echo "Adding $1 into /etc/environment..."
45. echo "$1=\"$2\"" >> /etc/environment
46. fi
47. source /etc/environment
48. fi
49. }

maven目錄下還有一個check.sh腳本：

1. #!/bin/bash
3. #check java is available in this session
4. function hasMaven {
5. v=`mvn -version 2>&1`
7. echo 'check maven ...'
9. pos=`expr match "$v" 'Apache Maven 3.0.4'`
10. if [ $pos -gt 0 ]
11. then
12. return 1
13. else
14. return 0
15. fi
16. }

到現在為止，用模塊化的方式編寫bash，讓後面的工作可以復用前面的腳本。感覺輕松多了。