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Alternatives system 0.2.0

  Date Added: March 24, 2010  |  Visits: 900

Alternatives system

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Alternatives system is an implementation of a Debian alternatives system; a system that allows several programs with the same or similar functions to be installed on a single system at the same time. This implementation solves some problems and limitations of original implementation. Alternatives architecture General engine: - alternatives-auto - turn into auto mode some alternatives item - alternatives-manual - turn into manual mode some alternatives item - alternatives-update - update current state of alternatives symlinks Special scripts for the packages: - alternatives-install - register new alternatives config, for use in %post package script - alternatives-uninstall - unregister some alternatives config, for use in %preun package script ALT Linux specific: - alternatives-helper - helper script to use in package scripts - alternatives-upgrade - tool to upgrade from old config format (XML based) to new. Directories: - /usr/bin - all scripts live here - /etc/alternatives/packages.d - all package configs - /etc/alternatives/auto - symlinks to registered configs - /etc/alternatives/manual - list of alternatives in manual mode - /etc/alternatives/links - for internal use only, alternatives symlinks lives here - /usr/share/alternatives - directory with some helper functions and scripts Original Debian alternatives implementation has some limitations and problems, so we (ALT Linux Team) rewrite this subsystem. What changes we have made? - You dont need to give special generic name for altenatives file. This name is autogenerated now. - This version is written in shell, awk and sed , so we reduce a number of dependencies, therefore, number of the packages in basesystem. - We use different update model. Original alternatives system maintains its own database, by creating/removing files in system. In our alternatives (rpm) packages contains its configs and places them into generic directory during package installation. After package removal its config is automatically removed. It works like Debian menu subsystem, and its more stable. - Now we have not any limitations for master-slave hieracly depth. - New alternatives system works with no groups, but with each item. You can turn into manual mode any available item. There are only one difference between master and slave: weight calculation algorithm. Slave alternative have same weight as a master alternative. - alternatives-update script corrects invalid manual alternatives, by switching them into auto mode. In original alternatives was situations with broken symlinks. Also new system doesnt create symlinks if target file does not exist. As a result, we also reduce number of broken symlinks..

Requirements: No special requirements
Platforms: Linux
Keyword: Alternatives Debian Implementation Package Symlinks System System Administration
Users rating: 0/10

License: Freeware Size: 22.53 KB
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