抽取rpm源码包

Extracting rpm file command

To be frank there is no direct option available for rpm command to extract an RPM file. But there is a small nifty utility available called rpm2cpio. It rxtract cpio archive from RPM Package Manager (RPM) package. With the following hack you will be able to extract an RPM file.

First you use rpm2cpio to convert the .rpm file into a cpio archive on standard out. If a - argument is given, an rpm stream is read from standard in. The basic syntax is as follows:

pm2cpio myrpmfile.rpm
rpm2cpio - < myrpmfile.rpm
rpm2cpio myrpmfile.rpm | cpio -idmv

Examples - Extract files from rpm

Download an RPM file:

$ mkdir test
$ cd test
$ wget http://www.cyberciti.biz/files/lighttpd/rhel4-php5-fastcgi/php-5.1.4-1.esp1.x86_64.rpm

To extract RPM file using rpm2cpio and cpio command, type:

$ rpm2cpio php-5.1.4-1.esp1.x86_64.rpm | cpio -idmv

Sample outputs:

/etc/httpd/conf.d/php.conf
./etc/php.d
./etc/php.ini
./usr/bin/php
./usr/bin/php-cgi
./usr/lib64/httpd/modules/libphp5.so
./usr/lib64/php
./usr/lib64/php/modules
....
.....
..
./var/lib/php/session
./var/www/icons/php.gif
19188 blocks

In this example, output of rpm2cpio command piped to cpio command with following options:

• i: Restore archive
• d: Create leading directories where needed
• m: Retain previous file modification times when creating files
• v: Verbose i.e. display progress

Verify that you have extracted an RPM file in the current directory:

$ ls

Sample outputs:

etc  php-5.1.4-1.esp1.x86_64.rpm  usr  var

Say hello to Midnight Commander

GNU Midnight Commander (mc) is a directory browser/file manager for Unix-like operating systems. Install mc using the following :

# yum install mc

Opening an RPM file using Midnight Commander (mc)

You can use mc command as follows to browse or extract rpm files:

# mc

Sample outputs:

Fig.01: Browsing / viewing an rpm file with GNU Midnight Commander

Next select an RPM file (such as php-5.3*.rpm) by highlighting the package name and press Enter key. You need to select CONTENTS.cpio file:

Fig.02: The actual php rpm files are contained in the CONTENTS.cpio file

To view/edit/extract files click or press on the special function keys. In this example, I pressed  F3  function key to view php.conf file:

Fig.03: Viewing php.conf file

Conclusion

I hope you will find these tips useful to extract configuration file or other file without installing an RPM file.

Ref:  http://www.cyberciti.biz/tips/how-to-extract-an-rpm-package-without-installing-it.html