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liquidx |
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# Copyright 1999-2003 Gentoo Technologies, Inc. |
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# Distributed under the terms of the GNU General Public License v2 |
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# $Header: /home/cvsroot/gentoo-x86/eclass/rpm.eclass,v 1.8 2003/08/31 19:43:05 liquidx Exp $ |
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# Author : Alastair Tse <liquidx@gentoo.org> (03 Oct 2003) |
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# Short Desc: Creates symlink to the latest version of multiple slotted |
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# packages. |
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# |
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# Long Desc: |
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# |
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# When a package is SLOT'ed, very often we need to have a symlink to the |
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# latest version. However, depending on the order the user has merged them, |
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# more often than not, the symlink maybe clobbered by the older versions. |
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# |
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# This eclass provides a convenience function that needs to be given a |
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# list of alternatives (descending order of recent-ness) and the symlink. |
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# It will choose the latest version if can find installed and create |
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# the desired symlink. |
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# |
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# There are two ways to use this eclass. First is by declaring two variables |
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# $SOURCE and $ALTERNATIVES where $SOURCE is the symlink to be created and |
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# $ALTERNATIVES is a list of alternatives. Second way is the use the function |
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# alternatives_makesym() like the example below. |
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# |
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# Example: |
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# |
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# pkg_postinst() { |
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# alternatives_makesym "/usr/bin/python" "/usr/bin/python2.3" "/usr/bin/python2.2" |
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# } |
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# |
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# The above example will create a symlink at /usr/bin/python to either |
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# /usr/bin/python2.3 or /usr/bin/python2.2. It will choose python2.3 over |
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# python2.2 if both exist. |
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# |
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# Alternatively, you can use this function: |
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# |
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# pkg_postinst() { |
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# alternatives_auto_makesym "/usr/bin/python" "/usr/bin/python[0-9].[0-9]" |
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# } |
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# |
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# This will use bash pathname expansion to fill a list of alternatives it can |
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# link to. It is probably more robust against version upgrades. You should |
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# consider using this unless you are want to do something special. |
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# |
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ECLASS="alternatives" |
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INHERITED="$INHERITED $ECLASS" |
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# automatic deduction based on a symlink and a regex mask |
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alternatives_auto_makesym() { |
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local SOURCE REGEX ALT |
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local unsorted |
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SOURCE=$1 |
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REGEX=$2 |
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ALT="`ls -1 ${ROOT}${REGEX} | sort -r | xargs`" |
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if [ -n "${ALT}" ]; then |
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alternatives_makesym ${SOURCE} ${ALT} |
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else |
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eerror "regex ${REGEX} doesn't match any files." |
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fi |
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} |
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alternatives_makesym() { |
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local ALTERNATIVES="" |
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local SOURCE="" |
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# usage: alternatives_makesym <resulting symlink> [alternative targets..] |
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SOURCE=$1 |
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shift |
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ALTERNATIVES=$@ |
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# step through given alternatives from first to last |
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# and if one exists, link it and finish. |
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for alt in ${ALTERNATIVES}; do |
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if [ -f "${ROOT}${alt}" ]; then |
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if [ -L "${ROOT}${SOURCE}" ]; then |
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rm -f ${ROOT}${SOURCE} |
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fi |
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einfo "Linking ${alt} to ${SOURCE}" |
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ln -s ${alt} ${ROOT}${SOURCE} |
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break |
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fi |
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done |
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# report any errors |
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if [ ! -L ${ROOT}${SOURCE} ]; then |
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ewarn "Unable to establish ${SOURCE} symlink" |
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elif [ ! -f "`readlink ${ROOT}${SOURCE}`" -a ! -f "${ROOT}`readlink ${ROOT}${SOURE}`" ]; then |
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ewarn "${SOURCE} is a dead symlink." |
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fi |
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} |
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alternatives_pkg_postinst() { |
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if [ -n "${ALTERNATIVES}" -a -n "${SOURCE}" ]; then |
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alternatives_makesym ${SOURCE} ${ALTERNATIVES} |
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fi |
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} |
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alternatives_pkg_postrm() { |
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if [ -n "${ALTERNATIVES}" -a -n "${SOURCE}" ]; then |
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alternatives_makesym ${SOURCE} ${ALTERNATIVES} |
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fi |
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} |
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EXPORT_FUNCTIONS pkg_postinst pkg_postrm |
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