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# Copyright 1999-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/check-reqs.eclass,v 1.5 2006/02/15 12:51:25 ciaranm Exp $
#
# Original Author: Ciaran McCreesh <ciaranm@gentoo.org>
#
# This eclass provides a uniform way of handling ebuilds which have very high
# build requirements in terms of memory or disc space. It provides a function
# which should usually be called during pkg_setup().
#
# From a user perspective, the variable CHECKREQS_ACTION can be set to:
# * "warn" (default), which will display a warning and wait for 15s
# * "error", which will make the ebuild error out
# * "ignore", which will not take any action
# The chosen action only happens when the system's resources are detected
# correctly and only if they are below the threshold specified by the package.
#
# For ebuild authors: only use this eclass if you reaaalllllly have stupidly
# high build requirements. At an absolute minimum, you shouldn't be using this
# unless the ebuild needs >256MBytes RAM or >1GByte temporary or install space.
# The code should look something like:
#
# pkg_setup() {
# # values in MBytes
#
# # need this much memory (does *not* check swap)
# CHECKREQS_MEMORY="256"
#
# # need this much temporary build space
# CHECKREQS_DISK_BUILD="2048"
#
# # install will need this much space in /usr
# CHECKREQS_DISK_USR="1024"
#
# # install will need this much space in /var
# CHECKREQS_DISK_VAR="1024"
#
# # go!
# check_reqs
# }
#
# Alternatively, the check_reqs_conditional function can be used to carry out
# alternate actions (e.g. using a much slower but far less memory intensive
# build option that gives the same end result).
#
# You should *not* override the user's CHECKREQS_ACTION setting, nor should you
# attempt to provide a value if it is unset. Note that the environment variables
# are used rather than parameters for a few reasons:
# * easier to do if use blah ; then things
# * we might add in additional requirements things later
# If you don't specify a value for, say, CHECKREQS_MEMORY, then the test is not
# carried out.
#
# These checks should probably mostly work on non-Linux, and they should
# probably degrade gracefully if they don't. Probably.
inherit eutils
check_reqs() {
[ -n "$1" ] && die "Usage: check_reqs"
export CHECKREQS_NEED_SLEEP="" CHECKREQS_NEED_DIE=""
if [ "$CHECKREQS_ACTION" != "ignore" ] ; then
[ -n "$CHECKREQS_MEMORY" ] && check_build_memory
[ -n "$CHECKREQS_DISK_BUILD" ] && check_build_disk \
"${PORTAGE_TMPDIR}" "\${PORTAGE_TMPDIR}" "${CHECKREQS_DISK_BUILD}"
[ -n "$CHECKREQS_DISK_USR" ] && check_build_disk \
"${ROOT}/usr" "\${ROOT}/usr" "${CHECKREQS_DISK_USR}"
[ -n "$CHECKREQS_DISK_VAR" ] && check_build_disk \
"${ROOT}/var" "\${ROOT}/var" "${CHECKREQS_DISK_VAR}"
fi
if [ -n "${CHECKREQS_NEED_SLEEP}" ] ; then
echo
ewarn "Bad things may happen! You may abort the build by pressing ctrl+c in"
ewarn "the next 15 seconds."
ewarn " "
einfo "To make this kind of warning a fatal error, add a line to /etc/make.conf"
einfo "setting CHECKREQS_ACTION=\"error\". To skip build requirements checking,"
einfo "set CHECKREQS_ACTION=\"ignore\"."
epause 15
fi
if [ -n "${CHECKREQS_NEED_DIE}" ] ; then
eerror "Bailing out as specified by CHECKREQS_ACTION"
die "Build requirements not met"
fi
}
check_reqs_conditional() {
[ -n "$1" ] && die "Usage: check_reqs"
export CHECKREQS_NEED_SLEEP="" CHECKREQS_NEED_DIE=""
if [ "$CHECKREQS_ACTION" != "ignore" ] ; then
[ -n "$CHECKREQS_MEMORY" ] && check_build_memory
[ -n "$CHECKREQS_DISK_BUILD" ] && check_build_disk \
"${PORTAGE_TMPDIR}" "\${PORTAGE_TMPDIR}" "${CHECKREQS_DISK_BUILD}"
[ -n "$CHECKREQS_DISK_USR" ] && check_build_disk \
"${ROOT}/usr" "\${ROOT}/usr" "${CHECKREQS_DISK_USR}"
[ -n "$CHECKREQS_DISK_VAR" ] && check_build_disk \
"${ROOT}/var" "\${ROOT}/var" "${CHECKREQS_DISK_VAR}"
fi
[ -z "${CHECKREQS_NEED_SLEEP}" ] && [ -z "${CHECKREQS_NEED_DIE}" ]
}
# internal use only!
check_build_memory() {
[ -n "$1" ] && die "Usage: check_build_memory"
check_build_msg_begin "${CHECKREQS_MEMORY}" "MBytes" "RAM"
if [ -r /proc/meminfo ] ; then
actual_memory=$(sed -n -e '/MemTotal:/s/^[^:]*: *\([0-9]\+\) kB/\1/p' \
/proc/meminfo)
else
actual_memory=$(sysctl hw.physmem 2>/dev/null )
[ "$?" == "0" ] &&
actual_memory=$(echo $actual_memory | sed -e 's/^[^:=]*[:=]//' )
fi
if [ -n "${actual_memory}" ] ; then
if [ ${actual_memory} -lt $((1024 * ${CHECKREQS_MEMORY})) ] ; then
eend 1
check_build_msg_ick "${CHECKREQS_MEMORY}" "MBytes" "RAM"
else
eend 0
fi
else
eend 1
ewarn "Couldn't determine amount of memory, skipping ..."
fi
}
# internal use only!
check_build_disk() {
[ -z "$3" ] && die "Usage: check_build_disk where name needed"
check_build_msg_begin "${3}" "MBytes" \
"disk space at ${2}"
actual_space=$(df -Pm ${1} 2>/dev/null | sed -n \
'$s/\(\S\+\s\+\)\{3\}\([0-9]\+\).*/\2/p' 2>/dev/null )
if [ "$?" == "0" ] && [ -n "${actual_space}" ] ; then
if [ ${actual_space} -lt ${3} ] ; then
eend 1
check_build_msg_ick "${3}" "MBytes" \
"disk space at ${2}"
else
eend 0
fi
else
eend 1
ewarn "Couldn't figure out disk space, skipping ..."
fi
}
# internal use only!
check_build_msg_begin() {
ebegin "Checking for at least ${1}${2} ${3}"
}
# internal use only!
check_build_msg_skip() {
ewarn "Skipping check for at least ${1}${2} ${3}"
}
# internal use only!
check_build_msg_ick() {
if [ "${CHECKREQS_ACTION}" == "error" ] ; then
eerror "Don't have at least ${1}${2} ${3}"
echo
export CHECKREQS_NEED_DIE="yes"
else
ewarn "Don't have at least ${1}${2} ${3}"
echo
export CHECKREQS_NEED_SLEEP="yes"
fi
}
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