postinst is in openjdk-8-jdk-headless 8u77-b03-3ubuntu3.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
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set -e
multiarch=x86_64-linux-gnu
priority=1081
basedir=/usr/lib/jvm/java-8-openjdk-amd64
mandir=$basedir/man
jdiralias=java-1.8.0-openjdk-amd64
srcext=1.gz
dstext=1.gz
jdk_hl_tools='idlj jdeps wsimport rmic jinfo jsadebugd native2ascii jstat javac javah jstack jrunscript javadoc javap jar extcheck schemagen jps xjc jarsigner jmap jstatd jhat jdb serialver wsgen jcmd'
case "$1" in
configure)
# obsolete tool
if update-alternatives --list apt 2>/dev/null; then
update-alternatives --remove-all apt || true
fi
if [ -z "$2" ]; then
update_alternatives=y
fi
if [ -n "$multiarch" ] && [ -n "$2" ]; then
for i in $jdk_hl_tools; do
if [ -z "$(update-alternatives --list $i 2>/dev/null | grep ^$basedir/)" ]; then
update_alternatives=y
break
fi
done
fi
if [ "$update_alternatives" != y ] && [ $priority -gt 1060 ]; then
for i in $jre_tools; do
oldp=$(update-alternatives --query java | awk -v b=$basedir '/^Alternative:/ && $2~b {p=1} /^Priority:/ && p {print $2; exit}')
if [ -n "$oldp" ] && [ "$oldp" -le 1060 ]; then
update_alternatives=y
break
fi
done
fi
if [ "$update_alternatives" = y ]; then
if [ -n "$multiarch" ] && [ "$DPKG_MAINTSCRIPT_ARCH" != $(dpkg --print-architecture) ]; then
priority=$(expr $priority - 1)
fi
for i in $jdk_hl_tools; do
unset slave1 slave2 || true
if [ -e $mandir/man1/$i.$srcext ]; then
slave1="--slave \
/usr/share/man/man1/$i.$dstext \
$i.$dstext \
$mandir/man1/$i.$srcext"
fi
if false && [ -e $mandir/ja/man1/$i.$srcext ]; then
slave2="--slave \
/usr/share/man/ja/man1/$i.$dstext \
${i}_ja.$dstext \
$mandir/ja/man1/$i.$srcext"
fi
update-alternatives \
--install \
/usr/bin/$i \
$i \
$basedir/bin/$i \
$priority \
$slave1 $slave2
done
fi # update alternatives
;;
esac
exit 0
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