debian/dpkg.postinst

   1 #!/bin/sh
   2 # See deb-postinst(5).
   3
   4 set -e
   5
   6 PROGNAME=dpkg
   7
   8 . /usr/share/dpkg/sh/dpkg-error.sh
   9
  10 setup_colors
  11
  12 get_vendor()
  13 {
  14   local origin="$DPKG_ROOT/etc/dpkg/origins/default"
  15   local vendor
  16
  17   if [ -e "$origin" ]; then
  18     vendor=$(sed -ne 's/^Vendor: *\([^ ]\+\) */\1/p' "$origin" | tr A-Z a-z)
  19   fi
  20
  21   echo "${vendor:-default}"
  22 }
  23
  24 check_merged_usr_via_aliased_dirs()
  25 {
  26   local vendor
  27
  28   vendor=$(get_vendor)
  29
  30   case "$vendor" in
  31   debian)
  32     # In Debian some people have gotten so offended by the following _warning_
  33     # that they have resorted to bullying and abuse. Life's too short, sorry.
  34     return
  35     ;;
  36   ubuntu)
  37     # Ubuntu does not seem interested in it.
  38     return
  39     ;;
  40   esac
  41
  42   for d in /bin /sbin /lib /lib32 /libo32 /libx32 /lib64; do
  43     linkname="$(readlink $DPKG_ROOT$d || true)"
  44     if [ "$linkname" = "usr$d" ] || [ "$linkname" = "/usr$d" ]; then
  45       warning "This system uses merged-usr-via-aliased-dirs, going behind dpkg's"
  46       warning "back, breaking its core assumptions. This can cause silent file"
  47       warning "overwrites and disappearances, and its general tools misbehavior."
  48       warning "See <https://wiki.debian.org/Teams/Dpkg/FAQ#broken-usrmerge>."
  49       break
  50     fi
  51   done
  52 }
  53
  54 case "$1" in
  55 configure)
  56   check_merged_usr_via_aliased_dirs
  57   ;;
  58 abort-upgrade|abort-deconfigure|abort-remove)
  59   ;;
  60 *)
  61   error "called with unknown argument '$1'"
  62   ;;
  63 esac
  64
  65 #DEBHELPER#
  66 exit 0