Gunnar Wrobel

wrobel@gentoo.org

2006 Gunnar Wrobel

February 2006 Gentoo Linux layman 8 layman manage your local repository of gentoo overlays layman -a --add ALL overlay layman -d --delete ALL overlay layman -s --sync ALL overlay layman -S --sync-all layman -L --list layman -l --list-local layman -f --fetch layman -n --nofetch layman -k --nocheck layman -q --quiet layman -Q --quietness 0-4 layman is a script that allows you to add, remove and update gentoo overlays from a variety of sources. layman makes it easy to retrieve and update overlays for gentoo. In addition it makes it TRIVIAL to break your system. The main portage tree provides you with high quality ebuilds that are all maintained by gentoo developers. This will not be the case for most of the overlays you can get by using layman. Thus you are removing the security shield that the standard tree provides for you. You should keep that in mind when installing ebuilds from an overlay. To ensure the security of your system you MUST read the source of the ebuild you are about to install. layman intends to provide easy maintenance of gentoo overlays while not requiring any configuration. layman allows you to fetch an overlay without the need to modify any configuration files. In order for this to be possible the script needs an external list of possible overlay sources. There will be a centralized list available here, but nothing will prevent you from using or publishing your own list of overlays. The location of the remote lists can also be modified using the --overlays option when running layman. To get a new overlay added to the central list provided for layman, send a mail to overlays@gentoo.org. Gentoo developers may add their overlay entries directly into the list which can be accessed over the CVS repository for the Gentoo website. You can also use several lists at the same time. Just add one url per line to the overlays variable in your configuration file. layman will merge the contents of all lists. layman also allows you to define local files in this list. Just make sure you prepend these pathnames in standard URL notation with file://. If you need to use a proxy for access to the internet, you can use the corresponding variable in the layman configuration file. Layman will also respect the http_proxy environment variable in case you set it. layman stores a local copy of the fetched remote list. It will be stored in /usr/portage/local/layman/cache.xml by default. There exists only one such cache file and it will be overwritten every time you run layman. Since layman is designed to automatically handle the inclusion of overlays into your system it needs to be able to modify the PORTDIR_OVERLAY variable in your /etc/make.conf file. But /etc/make.conf is a very central and essential configuration file for a gentoo system. Automatically modifying this file would be somewhat dangerous. You can allow layman to do this by setting the make_conf variable in the configuration file to /etc/make.conf. A much safer and in fact recommended solution to the problem is to let layman handle an external file that only contains the PORTDIR_OVERLAY variable and is sourced within the standard /etc/make.conf file. Just add the following line to the end of your /etc/make.conf file: source /usr/portage/local/layman/make.conf /usr/portage/local/layman/make.conf is the default provided in the layman configuration. Change this filename in case you decide to store it somewhere else. The file does not necessarily need to exist at the beginning. If it is missing, layman will create it for you. There is also no need to remove the original PORTDIR_OVERLAY variable from the make.conf file. Layman will simply add new overlays to this variable and all your old entries will remain in there. Once a remote list of overlays has been fetched, layman allows to add overlays from the remote list to your system. The script will try to fetch the overlay. If this is successful the overlay information will be copied from the cache to the list of locally installed overlays. In addition layman will modify the PORTDIR_OVERLAY variable to include the new overlay path. Removing the overlay with layman will delete the overlay without leaving any traces behind. In order to update all overlays managed by layman you can run the script with the --sync ALL option or the --sync-all flag. layman provides the --list and --list-local options to print a list of available respectively installed overlays. Listing will prepend all fully supported overlays with a green asterisk, all non-official overlays with a yellow asterisk and all overlays that you will not be able to use since you do not have the necessary tools installed with a red asterisk. In the default mode layman will be strict about listing overlays and only present you with overlays that are fully supported. In addition it will complain about overlays that are missing a description field or a contact attribute. This type of behaviour has been added with layman-1.0.7 and if you'd like to return to the old behaviour you may use the k option flag or set the nocheck option in the configuration file. Currently layman supports overlays that are exported via rsync, subversion, bzr, darcs, git, mercurial or provided as tar packages. List of possible layman actions. -f --fetch Fetches the remote list of overlays. You will usually NOT need to explicitely specify this option. The fetch operation will be performed automatically once you run the sync, sync-all, or list action. You can prevent this automatic fetching using the --nofetch option. -a overlay --add overlay Add the given overlay from the cached remote list to your locally installed overlays. Specify "ALL" to add all overlays from the remote list. -d overlay --delete overlay Remove the given overlay from your locally installed overlays. Specify "ALL" to remove all overlays -s overlay --sync overlay Update the specified overlay. Use "ALL" as parameter to synchronize all overlays -i overlay --info overlay Display all available information about the specified overlay. -S --sync-all Update all overlays. Shortcut for -s ALL. -L --list List the contents of the remote list. -l --list-local List the locally installed overlays. List of available layman options. -c path --config path Path to an alternative configuration file. -o url --overlays url Specifies the location of additional overlay lists. You can use this flag several times and the specified urls will get temporarily appended to the list of urls you specified in your config file. You may also specify local file urls by prepending the path with file://. This option will only append the URL for this specific layman run - edit your config file to add a URL permanently. So this is useful for testing purposes. -n --nofetch Prevents layman from automatically fetching the remote lists of overlays. The default behaviour for layman is to update all remote lists if you run the sync, list or fetch operation. -k --nocheck Prevents layman from checking the remote lists of overlays for complete overlay definitions. The default behaviour for layman is to reject overlays that do not provide a description or a contact attribute. -q --quiet Makes layman completely quiet. This option is dangerous: If the processes spawned by layman when adding or synchronizing overlays require any input layman will hang without telling you why. This might happen for example if your overlay resides in subversion and the SSL certificate of the server needs acceptance. -v --verbose Makes layman more verbose and you will receive a description of the overlays you can download. -N --nocolor Remove color codes from the layman output. -QLEVEL --quietnessLEVEL Makes layman less verbose. Choose a value between 0 and 4 with 0 being completely quiet. Once you set this below 3, the same warning as given for --quiet applies. -pLEVEL --priorityLEVEL Use this option in combination with the --add. It will modify the priority of the added overlay and thus influence the order of entries in the make.conf file. The lower the priority, the earlier in the list the entry will be mentioned. Use a value between 0 and 100. The default value is 50. layman -f -a wrobel This would add the overlay with the id wrobel to your list of installed overlays. layman -s ALL This updates all overlays layman -f -a wrobel -a webapps-experimental This fetches the remote list and immediately adds two overlays /etc/layman/layman.cfg Configuration file, holding the defaults for layman