postinst is in emacs25-bin-common 25.1+1-4+deb9u1.
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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | #!/bin/sh
set -e
FLAVOR=emacs25
MAJOR=25
MINOR=1
FULL=25.1
ALTERNATIVES="ctags ebrowse emacsclient etags"
BIN_PRIORITY=28
# update-alternatives on things that collide with xemacs, other editors
for i in ${ALTERNATIVES}
do
update-alternatives \
--install /usr/bin/$i $i /usr/bin/$i.${FLAVOR} ${BIN_PRIORITY} \
--slave /usr/share/man/man1/$i.1.gz $i.1.gz \
/usr/share/man/man1/$i.${FLAVOR}.1.gz
done
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