postinst is in libnss-docker 0.01-1.
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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | #!/bin/sh
set -e
# This code was taken from nss-mdns:
log() {
echo "$*"
}
# try to insert docker entries to the "hosts" line in /etc/nsswitch.conf to
# automatically enable libnss-docker support; do not change the
# configuration if the "hosts" line already references some docker lookups
insert_nss_entry() {
log "Checking NSS setup..."
# abort if /etc/nsswitch.conf does not exist
if ! [ -e /etc/nsswitch.conf ]; then
log "Could not find /etc/nsswitch.conf."
return
fi
perl -i -pe '
sub insert {
# this also splits on tab
my @bits = split(" ", shift);
# do not break configuration if the "hosts" line already references
# docker
if (grep { $_ eq "docker" } @bits) {
return join " ", @bits;
}
# change "files" into "files docker [NOTFOUND=return]"
return join " ", map {
$_ eq "files" ? ("$_", "docker [NOTFOUND=return]") : $_
} @bits;
}
s/^(hosts:\s+)(.*)/$1.insert($2)/e;
' /etc/nsswitch.conf
}
action="$1"
if [ configure = "$action" ]; then
if [ -z "$2" ]; then
log "First installation detected..."
# first install: setup the recommended configuration (unless
# nsswitch.conf already contains docker entries)
insert_nss_entry
else
# upgrade
version="$2"
# Nothing to do here yet
fi
fi
|