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packages:alternatives
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packages:alternatives [2016-02-01 06:14] glen created |
packages:alternatives [2016-02-01 06:24] glen [integrating] |
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| [[http://linux.die.net/man/8/update-alternatives|update-alternatives]] - maintain symbolic links determining default commands | [[http://linux.die.net/man/8/update-alternatives|update-alternatives]] - maintain symbolic links determining default commands | ||
| + | |||
| + | ===== switching alternative ===== | ||
| + | |||
| + | By default ''alternatives'' uses ''auto'' mode picking the "best" alternative. | ||
| + | |||
| + | //TODO: how to enforce sysadmin preference// | ||
| + | |||
| + | ===== integrating ===== | ||
| + | |||
| + | from [[http://git.pld-linux.org/?p=packages/php.git;a=commitdiff;h=82885e7c57e9ee9183eead2319352703c8278a35|phar-php example]]: | ||
| + | |||
| + | <code rpmspec> | ||
| + | Requires: alternatives | ||
| + | ... | ||
| + | |||
| + | %install | ||
| + | ... | ||
| + | # touch for ghost | ||
| + | %{__rm} $RPM_BUILD_ROOT%{_bindir}/phar | ||
| + | touch $RPM_BUILD_ROOT%{_bindir}/phar | ||
| + | |||
| + | %post phar | ||
| + | update-alternatives \ | ||
| + | --install %{_bindir}/phar phar %{_bindir}/phar%{ver_suffix}.phar %{ver_suffix} \ | ||
| + | --slave %{_mandir}/man1/phar.1 phar.1 %{_mandir}/man1/phar%{ver_suffix}.1* || : | ||
| + | |||
| + | %postun phar | ||
| + | if [ $1 -eq 0 ]; then | ||
| + | update-alternatives --remove phar %{_bindir}/phar || : | ||
| + | fi | ||
| + | |||
| + | ... | ||
| + | %files | ||
| + | ... | ||
| + | %ghost %{_bindir}/phar | ||
| + | %ghost %{_mandir}/man1/phar.1 | ||
| + | </code> | ||
| + | |||
| + | - add ''Requires: alternatives'' to runtime deps | ||
| + | - the path must be ghost and regular file, otherwise rpm will complin about file-conflicts | ||
| + | - use ''%%--install%%'' to setup the symlinks in package ''%post'' scriptlet. | ||
| + | - the ''%%--slave%%'' option is optional and may be repeated, use if you wish to "group" alternatives | ||
| + | - use proper ''%postun'' to remove alternative on package uninstall | ||
| + | |||
| + | <note warning> | ||
| + | Currently it remains unclear how to handle optional files, as for above example: | ||
| + | - ''%{_mandir}'' path can be missing if ''%_excludedocs'' is set | ||
| + | - ''%{_mandir}'' path could be ''.gz'' compressed or not, it's currently solved with a glob: ''%{_mandir}/man1/phar%{ver_suffix}.1*'' | ||
| + | </note> | ||
packages/alternatives.txt ยท Last modified: 2016-02-01 06:25 by glen
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