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A sample of the default values set by /usr/lib/rpm/rpmrc is shown here:
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# Default values, often overridden in /etc/rpmrc dbpath: /var/lib/rpm topdir: /usr/src/redhat tmppath: /var/tmp cpiobin: cpio defaultdocdir: /usr/doc
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By default, RPM is designed to work with source code placed in a directory consisting of its name and a release number, separated by a hyphen. For example, a program with the name bookrec and release 1.0 should have its source-code files in a directory called bookrec-1.0. If RPM needs to compile the software, it expects to find the source code in that directory within the BUILD directory, BUILD/bookrec-1.0. The same name and release number also must be specified in the spec file.
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To create a package, first create an rpm spec file for it. The rpm spec file specifies the files to be included, any actions to build the software, and information about the package. The spec file is designed to take the program through several stages, starting with unpacking it from an archive, compiling its source code, and generating the RPM package. In the spec file are segments for the different stages, and special RPM macros that perform actions at these stages. These are listed in Table 3-9.
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File Segment or Macro %description %prep %setup Description A detailed description of the software. The prep stage for archives and patches. The prep macro for unpacking archives. A -n name option resets the name of the build directory. The prep macro for updating patches. The build stage for compiling software. The install stage for installing software.
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%patch %build %install
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Table 3-9.
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RPM File Segments and Macros
112 Red Hat Linux Pocket Administrator
File Segment or Macro %files Description The files stage that lists the files to be included in the package. A -f filename option specifies a file that contains a list of files to be included in the package. A file macro that lists configuration files to be placed in the /etc directory. A file macro that lists documentation files to be placed in the /usr/doc directory with the subdirectory of the name-version-release. The specification of a directory to be included as being owned by a package. (A directory in a file list refers to all files in it, not only the directory.) A macro to do preinstall scripts. A macro to do preuninstall scripts. A macro to do postinstall scripts. A macro to do postuninstall scripts.
%config file-list %doc file-list
%dir directory-list
%pre %preun %post %postun
Table 3-9.
RPM File Segments and Macros (continued)
A spec file is divided into five basic segments: header, prep, build, install, and files. These segments are separated in the file by empty lines. The header segment contains several lines of information, each preceded by a tag and a semicolon. For example, the following tag is used for a short description of the software:
Summary: bookrec program to manage book records
The name, version, and release tags are used to build the name of the RPM package. The name, version, and release are separated with hyphens. For example, the name bookrec with the version 1.0 and release 2 has the following name: bookrec-1.0-2 The Group entry is a list of categories for the software and is used by the RPM package management utilities like redhat-config-packages to place the software in the correct category folder. The Source entry is the compressed
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archive where the software is stored on your system. Description is a detailed description of the software. Following the header are the three stages for creating and installing the software on your system, indicated by the %prep, %build, and %install rpm macros. You can skip any of these stages, say, if the software is already installed. You can also leave any of them out of the spec file or comment them out with a preceding #. The spec file is capable of taking a compressed archive, unpacking it, compiling the source code files, and then installing the program on your system. Then, the installed files can be used to create the RPM package.
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