Centos – Building official SRPMs in CentOS. All the steps

centosredhatrpm

I am new to Centos and yum in general.

How do I retreive the SRPM using yumdownloader --source? When I run the command it says the SRPMs are not found. How do I add the repository? I am talking about official CentOS packages here.
Once downloaded, what is the command to unpack the SRPM so I can edit the files?
Last, once I am done modifying, what is the command to rebuild the modified source RPM?
From a SRPM, how does one create a RPM?

Best Answer

How do I retreive the SRPM using yumdownloader --source? When I run the command it says the SRPMs are not found. How do I add the repository? I am talking about official CentOS packages here.

This is an issue with CentOS: http://bugs.centos.org/view.php?id=1646

Assuming you're CentOS 5, create this file in /etc/yum.repos.d/CentOS-SRPMS.repo

[base-SRPMS]
name=CentOS-$releasever - Base SRPMS
baseurl=http://mirror.centos.org/centos/$releasever/os/SRPMS/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
priority=1
enabled=1

#released updates
[update-SRPMS]
name=CentOS-$releasever - Updates SRPMS
baseurl=http://mirror.centos.org/centos/$releasever/updates/SRPMS/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
priority=1
enabled=1

#packages used/produced in the build but not released
[addons-SRPMS]
name=CentOS-$releasever - Addons SRPMS
baseurl=http://mirror.centos.org/centos/$releasever/addons/SRPMS/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
priority=1
enabled=1

#additional packages that may be useful
[extras-SRPMS]
name=CentOS-$releasever - Extras SRPMS
baseurl=http://mirror.centos.org/centos/$releasever/extras/SRPMS/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
priority=1
enabled=1

#additional packages that extend functionality of existing packages
[centosplus-SRPMS]
name=CentOS-$releasever - Plus SRPMS
baseurl=http://mirror.centos.org/centos/$releasever/centosplus/SRPMS/
gpgcheck=1
enabled=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
priority=1

#contrib - packages by Centos Users
[contrib-SRPMS]
name=CentOS-$releasever - Contrib SRPMS
baseurl=http://mirror.centos.org/centos/$releasever/contrib/SRPMS/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
priority=1

Once downloaded, what is the command to unpack the SRPM so I can edit the files?

rpm -ivh your.src.rpm

This assumes you have necessary directories, if you don't run mkdir -p /usr/src/redhat/{BUILD,RPMS,SOURCES,SPECS,SRPMS} to create them.

The file you'll usually want to edit is the spec file in /usr/src/redhat/SPECS/packagename.spec.

Last, once I am done modifying, what is the command to rebuild the modified source RPM?

rpmbuild -bb /usr/src/redhat/SPECS/your.spec to just build the RPM

rpmbuild -ba /usr/src/redhat/SPECS/your.spec to just build the RPM and an SRPM

From a SRPM, how does one create a RPM?

rpmbuild --rebuild your.src.rpm

If you need to build RPMs you should look in to using mock.

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Have you looked at using this build of php53? http://dev.centos.org/centos/5/testing/x86_64/RPMS/php53/

Redhat – RHEL6 SRPMs Are Not Found by “yumdownloader”

This seems to be a bug in yum-utils, nothing that you're doing wrong.

I did a little crude "print" debugging between my RHEL 6 server, and My Fedora 14 workstation. Right after line 47 & 48 in /usr/bin/yumdownloader:

(n,v,r,e,a) = rpmUtils.miscutils.splitFilename(pkg.sourcerpm)
src = self.pkgSack.searchNevra(name=n, ver=v, rel=r, arch='src')

I added a couple of debugging statements and found the following:

From my RHEL 6 server (indented areas following "Debug:" being the areas of interest):

# yumdownloader --source gcc
Loaded plugins: presto, rhnplugin
Enabling epel-source repository
Debug: 
    pkg.sourcerpm = gcc-4.4.4-13.el6.src.rpm
    n = gcc
    v = 4.4.4
    r = 13.el6
    src = []
No source RPM found for gcc-4.4.4-13.el6.x86_64
Debug: 
    pkg.sourcerpm = gcc-4.4.5-6.el6.src.rpm
    n = gcc
    v = 4.4.5
    r = 6.el6
    src = []
No source RPM found for gcc-4.4.5-6.el6.x86_64
Nothing to download

From my Fedora 14 workstation:

# yumdownloader --source gcc
Loaded plugins: presto, refresh-packagekit
Enabling updates-source repository
Enabling rpmfusion-nonfree-updates-source repository
Enabling rpmfusion-nonfree-source repository
Enabling rpmfusion-free-updates-source repository
Enabling fedora-source repository
Enabling rpmfusion-free-source repository
Debug: 
    pkg.sourcerpm = gcc-4.5.1-4.fc14.src.rpm
    n = gcc
    v = 4.5.1
    r = 4.fc14
    src = [<YumAvailablePackageSqlite : gcc-4.5.1-4.fc14.src (0xe5e150)>]
gcc-4.5.1-4.fc14.src.rpm                                 |  52 MB     00:38

So we know what src "should" be, based off of Fedora 14. /usr/bin/yumdownloader is identical between RHEL6, and Fedora 14 (md5sums match). However the yum-utils libraries that yumdownloader is leveraging are different between RHEL6 and Fedora 14, and that is likely the culprit.

I'd file a bug with Redhat against the yum-utils package.

Best Answer

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Redhat – RHEL6 SRPMs Are Not Found by “yumdownloader”

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