josch/findunusedbd
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josch 2014-06-05 14:14:03 +02:00
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findunusedbd.sh Executable file
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#!/bin/sh -ex
# start this script without arguments and then start sbuild as:
#
# sbuild --chroot-setup-commands='/home/josch/prebuildcmd.sh chroot-setup' --pre-realbuild-commands='/home/josch/prebuildcmd.sh pre-realbuild' --post-realbuild-commands='/home/josch/prebuildcmd.sh post-realbuild'
if [ "$#" -ne 1 ]; then
rm -rf /home/josch/myfifo /home/josch/myfifo2 /tmp/pkglists
mkfifo /home/josch/myfifo
mkfifo /home/josch/myfifo2
mkdir -p /tmp/pkglists
# strip the architecture qualifier
cat /home/josch/myfifo | cut -d ':' -f 1 | sort > initialselection.list
echo > /home/josch/myfifo2
cat /home/josch/myfifo | cut -d ':' -f 1 | sort > fullselection.list
echo > /home/josch/myfifo2
# get all packages that were installed on top of the base packages
comm -13 initialselection.list fullselection.list > bdselection.list
while true; do
pkgname=`cat /home/josch/myfifo | cut -d ':' -f 1`
echo > /home/josch/myfifo2
# end loop when packagename is empty
[ -z "$pkgname" ] && break
# check if the package was installed as its build dependencies
if grep --line-regexp $pkgname bdselection.list; then
cat /home/josch/myfifo | sort > "/tmp/pkglists/$pkgname"
else
cat /home/josch/myfifo > /dev/null
fi
echo > /home/josch/myfifo2
done
cat /home/josch/myfifo | sed 's/, \+/\n/'g \
| sed 's/\([a-zA-Z0-9][a-zA-Z0-9+.-]*\).*/\1/' \
> /tmp/sbuild-dummy-depends
echo > /home/josch/myfifo2
SCHROOT_SESSION_ID=`cat /home/josch/myfifo`;
echo > /home/josch/myfifo2
# start fatrace in the mounted directory
(
cd /var/lib/schroot/mount/$SCHROOT_SESSION_ID;
sudo fatrace --current-mount > /home/josch/fatrace.log &
FATRACE_PID=$!;
cat /home/josch/myfifo > /dev/null;
echo > /home/josch/myfifo2
sudo kill $FATRACE_PID;
)
# clean up the fatrace log to only include unique paths
sed 's/\/var\/lib\/schroot\/mount\/[^\/]\+//' /home/josch/fatrace.log \
| awk '{ print $3; }' \
| grep -v ^/build \
| sort \
| uniq \
> accessed.log
# now get all packages in /tmp/pkglists that have files that never appear in the collected trace
while read pkg; do
# FIXME: the following cannot handle dependencies on virtual packages
[ -z "`comm -12 accessed.log /tmp/pkglists/$pkg`" ] \
&& grep --line-regexp "$pkg" /tmp/sbuild-dummy-depends || true
done > unneededdepends.list < bdselection.list
else
case "$1" in
chroot-setup)
env
dpkg --get-selections | awk '{ print $1; }' > /home/josch/myfifo
cat /home/josch/myfifo2 > /dev/null
;;
pre-realbuild)
# get the current selection so that the parent script can find the additional packages that were installed
dpkg --get-selections | awk '{ print $1; }' > /home/josch/myfifo
cat /home/josch/myfifo2 > /dev/null
# output the files belonging to all packages
for pkg in `dpkg --get-selections | awk '{ print $1; }'`; do
echo $pkg > /home/josch/myfifo
cat /home/josch/myfifo2 > /dev/null
dpkg -L $pkg > /home/josch/myfifo
cat /home/josch/myfifo2 > /dev/null
done
# output an empty line to indicate the end
echo > /home/josch/myfifo
cat /home/josch/myfifo2 > /dev/null
# output the dependencies of the sbuild dummy package
dpkg --get-selections | awk '{ print $1; }' \
| grep sbuild-build-depends \
| grep -v sbuild-build-depends-core-dummy \
| grep -v sbuild-build-depends-essential-dummy \
| grep -v sbuild-build-depends-lintian-dummy \
| xargs -I {} dpkg-query --showformat='${Depends}\n' --show {} \
> /home/josch/myfifo
cat /home/josch/myfifo2 > /dev/null
# output the schroot id to start tracing
echo $SCHROOT_SESSION_ID > /home/josch/myfifo
cat /home/josch/myfifo2 > /dev/null
;;
post-realbuild)
echo "done" > /home/josch/myfifo
cat /home/josch/myfifo2 > /dev/null
;;
*)
echo "invalid argument: $1" >&2
;;
esac
fi