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Rebuilding the RPM Database
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RPM maintains a record of the packages it has installed in its RPM database. You may, at times, have to rebuild this database to ensure RPM has current information on what is installed and what is not. Use the --rebuilddb option to rebuild your database file: # rpm --rebuilddb
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To create a new RPM database, use the --initdb option. This option can be combined with --dbpath to specify a location for the new database.
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Installing Software from RPM Source Code Files: SRPMs
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Red Hat and several other distributors also make available source code versions of their binary RPM
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packaged software. The source code is packaged into RPM packages that will be automatically installed into designated directories where you can easily compile and install the software. Source code packages are called SRPMs. The names for these packages end in the extension .src.rpm. Source code versions for packages in the Red Hat distribution are located on Red Hat releases in the SRPMS directory. Many online sites like rpmfind.net also list SRPM packages. Source code versions have the advantage of letting you make your own modifications to the source code, allowing you to generate your own customized versions of RPM packaged software. You still use the rpm command with the -i option to install source code packages. In the following example, you install the source code for Freeciv: # rpm -i freeciv-1.13.0-2.src.rpm
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Source Code RPM Directories
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On Red Hat, SRPM files are installed in various subdirectories in the /usr/src/redhat directory. When SRPMs are installed, a spec file is placed in the /usr/src/redhat/SPECS directory, and the compressed archive of the source code files is placed in the /usr/src/redhat/SOURCES directory. For Freeciv, a spec file called freeciv.spec is placed in /usr/src/redhat/SPECS, and a compressed archive called freeciv-1.13.0.tar.gz is placed in the /usr/src/redhat/SOURCES directory.
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Building the Source Code
To build the source code files, you need to extract them and run any patches on them that may be included 3 with the package. You do this by changing to the /usr/ src/redhat/SPECS directory and using the rpm command, this time with the -bp option, to generate the source 3 code files: # cd /usr/src/redhat/SPECS # rpm -bp freeciv.spec The resulting source code files are placed in their own subdirectory with the package s name in the
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/usr/src/redhat/BUILD directory. For Freeciv, the Freeciv source code is placed in /usr/src/redhat/ BUILD/freeciv-1.13.0 directory. In this subdirectory, you can then modify the source code, as well as compile and install the application. Check the software s README and INSTALL files for details.
Installing Software from Compressed Archives: .tar.gz
Linux software applications in the form of source code are available at different sites on the Internet. You can download any of this software and install it on your system. Recent releases are often available in the form of compressed archive files. Applications will always be downloadable as compressed archives, if they don t have an RPM version. This is particularly true for the recent versions of Gnome or KDE packages. RPM packages are only intermittently generated.
Decompressing Software
Many software packages under development or designed for cross-platform implementation may not be in an RPM format. Instead, they may be archived and compressed. The filenames for these files end with the extensions .tar.gz, .tar.bz2, or .tar.Z. The different extensions indicate different decompression methods using different commands: gunzip for .gz, bunzip2 for .bz2, and decompress for .Z. In fact, most software with an RPM format also has a corresponding .tar.gz format. After you download such a package, you must first decompress it, and then unpack it with the tar command. The compressed archives could hold either source code that you then need to compile or, as is the case with Java packages, binaries that are ready to run. A compressed archive is an archive file created with tar, and then compressed with a compression tool like gzip. To install such a file, you must first decompress it with a decompression utility like gunzip utility, and then use
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