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/*! \page macros Macro syntax RPM has fully recursive spec file macros. Simple macros do straight text substitution. Parameterized macros include an options field, and perform argc/argv processing on white space separated tokens to the next newline. During macro expansion, both flags and arguments are available as macros which are deleted at the end of macro expansion. Macros can be used (almost) anywhere in a spec file, and, in particular, in "included file lists" (i.e. those read in using %files -f \<file\>). In addition, macros can be nested, hiding the previous definition for the duration of the expansion of the macro which contains nested macros. \section macros_defining Defining a Macro To define a macro use: \verbatim %define <name>[(opts)] <body> \endverbatim All whitespace surrounding \<body\> is removed. Name may be composed of alphanumeric characters, and the character `_' and must be at least 3 characters in length. A macro without an (opts) field is "simple" in that only recursive macro expansion is performed. A parameterized macro contains an (opts) field. "-" as opts disables all option processing, otherwise the opts (i.e. string between parentheses) are passed exactly as is to getopt(3) for argc/argv processing at the beginning of a macro invocation. While a parameterized macro is being expanded, the following shell-like macros are available: \verbatim %0 the name of the macro being invoked %* all arguments (unlike shell, not including any processed flags) %# the number of arguments %{-f} if present at invocation, the flag f itself %{-f*} if present at invocation, the argument to flag f %1, %2 the arguments themselves (after getopt(3) processing) \endverbatim At the end of invocation of a parameterized macro, the above macros are (at the moment, silently) discarded. \section macros_writing Writing a Macro Within the body of a macro, there are several constructs that permit testing for the presence of optional parameters. The simplest construct is "%{-f}" which expands (literally) to "-f" if -f was mentioned when the macro was invoked. There are also provisions for including text if flag was present using "%{-f:X}". This macro expands to (the expansion of) X if the flag was present. The negative form, "%{!-f:Y}", expanding to (the expansion of) Y if -f was *not* present, is also supported. In addition to the "%{...}" form, shell expansion can be performed using "%(shell command)". \section macros_builtin Builtin Macros There are several builtin macros (with reserved names) that are needed to perform useful operations. The current list is \verbatim %trace toggle print of debugging information before/after expansion %dump print the active (i.e. non-covered) macro table %getncpus return the number of CPUs %getconfdir expand to rpm "home" directory (typically /usr/lib/rpm) %dnl discard to next line (without expanding) %{echo:...} print ... to stdout %{warn:...} print warning: ... to stderr %{error:...} print error: ... to stderr and return an error %define ... define a macro %undefine ... undefine a macro %global ... define a macro whose body is available in global context %{macrobody:...} literal body of a macro %{basename:...} basename(1) macro analogue %{dirname:...} dirname(1) macro analogue %{suffix:...} expand to suffix part of a file name %{url2path:...} convert url to a local path %{getenv:...} getenv(3) macro analogue %{uncompress:...} expand ... to <file> and test to see if <file> is compressed. The expansion is cat <file> # if not compressed gzip -dc <file> # if gzip'ed bzip2 -dc <file> # if bzip'ed %{load:...} load a macro file %{lua:...} expand using the embedded Lua interpreter %{expand:...} like eval, expand ... to <body> and (re-)expand <body> %{expr:...} evaluate an expression %{shrink:...} trim leading and trailing whitespace, reduce intermediate whitespace to a single space %{quote:...} quote a parametric macro argument, needed to pass empty strings or strings with whitespace %{verbose:...} expand ... if rpm is in verbose mode (%{!verbose:...} works for non-verbose mode) %{S:...} expand ... to <source> file name %{P:...} expand ... to <patch> file name \endverbatim Macros may also be automatically included from /usr/lib/rpm/macros. In addition, rpm itself defines numerous macros. To display the current set, add "%dump" to the beginning of any spec file, process with rpm, and examine the output from stderr. \section conditionally_expanded_macros Conditionally Expanded Macros Sometimes it is useful to test whether a macro is defined or not. Syntax \verbatim %{?macro_name:value} %{?!macro_name:value} \endverbatim can be used for this purpose. %{?macro_name:value} is expanded to "value" if "macro_name" is defined, otherwise it is expanded to the empty string. %{?!macro_name:value} is the negative variant. It is expanded to "value" if "macro_name" not is defined. Otherwise it is expanded to the empty string. Frequently used conditionally expanded macros are e.g. Define a macro if it is not defined: \verbatim %{?!with_python3: %global with_python3 1} \endverbatim A macro that is expanded to 1 if "with_python3" is defined and 0 otherwise: \verbatim %{?with_python3:1}%{!?with_python3:0} \endverbatim or shortly \verbatim 0%{!?with_python3:1} \endverbatim %"{?macro_name}" is a shortcut for "%{?macro_name:%macro_name}". For "macro_name" that is builtin macro conditionally expanded macros behave differently. In such a case both macro "%{?builtin_macro:value}" and its negative version "%{?!builtin_macro:value}" are expanded exactly like the macro without exclamation mark and question mark "%{builtin_macro:value}". There is a special case among builtin macros: /verbatim %{?load:file} /verbatim it works like "%{load:file}" with the difference that the expansion does not emit an error if the file fails to load. For more complex tests it is possible to use conditionals like %if, %ifarch or %ifos. But the conditionals are not macros thus they are not described here. For more information please refer to spec manual. \section macros_example Example of a Macro Here is an example %patch definition from /usr/lib/rpm/macros: \verbatim %patch(b:p:P:REz:) \ %define patch_file %{P:%{-P:%{-P*}}%{!-P:%%PATCH0}} \ %define patch_suffix %{!-z:%{-b:--suffix %{-b*}}}%{!-b:%{-z:--suffix %{-z*}}}%{!-z:%{!-b: }}%{-z:%{-b:%{error:Can't specify both -z(%{-z*}) and -b(%{-b*})}}} \ %{uncompress:%patch_file} | patch %{-p:-p%{-p*}} %patch_suffix %{-R} %{-E} \ ... \endverbatim The first line defines %patch with its options. The body of %patch is \verbatim %{uncompress:%patch_file} | patch %{-p:-p%{-p*}} %patch_suffix %{-R} %{-E} \endverbatim The body contains 7 macros, which expand as follows \verbatim %{uncompress:...} copy uncompressed patch to stdout %patch_file ... the name of the patch file %{-p:...} if "-p N" was present, (re-)generate "-pN" flag -p%{-p*} ... note patch-2.1 insists on contiguous "-pN" %patch_suffix override (default) ".orig" suffix if desired %{-R} supply -R (reversed) flag if desired %{-E} supply -E (delete empty?) flag if desired \endverbatim There are two "private" helper macros: \verbatim %patch_file the gory details of generating the patch file name %patch_suffix the gory details of overriding the (default) ".orig" \endverbatim \section macros_using Using a Macro To use a macro, write: \verbatim %<name> ... \endverbatim or \verbatim %{<name>} \endverbatim The %{...} form allows you to place the expansion adjacent to other text. The %\<name\> form, if a parameterized macro, will do argc/argv processing of the rest of the line as described above. Normally you will likely want to invoke a parameterized macro by using the %\<name\> form so that parameters are expanded properly. Example: \verbatim %define mymacro() (echo -n "My arg is %1" ; sleep %1 ; echo done.) \endverbatim Usage: \verbatim %mymacro 5 \endverbatim This expands to: \verbatim (echo -n "My arg is 5" ; sleep 5 ; echo done.) \endverbatim This will cause all occurrences of %1 in the macro definition to be replaced by the first argument to the macro, but only if the macro is invoked as "%mymacro 5". Invoking as "%{mymacro} 5" will not work as desired in this case. \section macros_shell_expansion Shell Expansion Shell expansion can be performed using "%(shell command)". The expansion of "%(...)" is the output of (the expansion of) ... fed to /bin/sh. For example, "%(date +%%y%%m%%d)" expands to the string "YYMMDD" (final newline is deleted). Note the 2nd % needed to escape the arguments to /bin/date. \section macros_expression_expansion Expression Expansion Expression expansion can be performed using "%[expression]". An expression consists of terms that can be combined using operators. Rpm supports three kinds of terms, numbers made up from digits, strings enclosed in double quotes (eg "somestring") and versions enclosed in double quotes preceded by v (eg v"3:1.2-1"). Rpm will expand macros when evaluating terms. You can use the standard operators to combine terms: logical operators &&, ||, !, relational operators !=, ==, <, > , <=, >=, arithmetic operators +, -, /, *, the ternary operator ? :, and parentheses. For example, "%[ 3 + 4 * (1 + %two) ]" will expand to "15" if "%two" expands to "2". Version terms are compared using rpm version ([epoch:]version[-release]) comparison algorithm, rather than regular string comparison. Note that the "%[expression]" expansion is different to the "%{expr:expression}" macro. With the latter, the macros in the expression are expanded first and then the expression is evaluated (without re-expanding the terms). Thus \verbatim rpm --define 'foo 1 + 2' --eval '%{expr:%foo}' \endverbatim will print "3". Using '%[%foo]' instead will result in the error that "1 + 2" is not a number. Doing the macro expansion when evaluating the terms has two advantages. First, it allows rpm to do correct short-circuit processing when evaluation logical operators. Second, the expansion result does not influence the expression parsing, e.g. '%["%file"] will even work if the "%file" macro expands to a string that contains a double quote. \section macros_commandline Command Line Options When the command line option "--define 'macroname value'" allows the user to specify the value that a macro should have during the build. Note lack of leading % for the macro name. We will try to support users who accidentally type the leading % but this should not be relied upon. Evaluating a macro can be difficult outside of an rpm execution context. If you wish to see the expanded value of a macro, you may use the option \verbatim --eval '<macro expression>' \endverbatim that will read rpm config files and print the macro expansion on stdout. Note: This works only macros defined in rpm configuration files, not for macros defined in specfiles. You can use %{echo: %{your_macro_here}} if you wish to see the expansion of a macro defined in a spec file. \section macros_configuration Configuration using Macros Starting in rpm 3.0, macros rather than rpmrc lines are used to configure rpm. In general, all the rpmrc configuration lines documented in "Maximum RPM" have been converted to macros, usually with a leading underscore, and the same name that was used in rpmrc files. In some cases, there is no leading underscore. Those macros existed in rpm-2.5.x and the underscore is omitted in order to preserve the meaning and usage of macros that are defined during spec file parsing. Here's an example to illustrate configuration using macros: \verbatim Old way: In /etc/rpmrc and/or ~/.rpmrc you put something: some_value New way: In /etc/rpm/macros and/or ~/.rpmmacros %_something some_value \endverbatim Here are 2 common FAQ for experienced users of rpm: \verbatim 1) --rcfile works differently. Old way: rpm --rcfile whatever New way: rpm --rcfile /usr/lib/rpm/rpmrc:whatever 2) topdir (and other rpmrc configurables) work differently. Old way: ~/.rpmrc contains topdir: whatever New way: /usr/lib/rpm/rpmrc contains macrofiles: /usr/lib/rpm/macros: ... :~/.rpmmacros ~/.rpmmacros contains %_topdir whatever \endverbatim \section macros_autoconf Macro Analogues of Autoconf Variables Several macro definitions provided by the default rpm macro set have uses in packaging similar to the autoconf variables that are used in building packages: \verbatim %_prefix /usr %_exec_prefix %{_prefix} %_bindir %{_exec_prefix}/bin %_sbindir %{_exec_prefix}/sbin %_libexecdir %{_exec_prefix}/libexec %_datadir %{_prefix}/share %_sysconfdir /etc %_sharedstatedir %{_prefix}/com %_localstatedir %{_prefix}/var %_libdir %{_exec_prefix}/lib %_includedir %{_prefix}/include %_oldincludedir /usr/include %_infodir %{_datadir}/info %_mandir %{_datadir}/man \endverbatim */