Description: Fix logic in 15killprocs
 The code that tried to identify processes running in a chroot
 was failing when the chroot path contained a symlink (/var/run)
 since the kernel reports a canonicalized name.
 .
 Thanks to Christoph Biedl <debian.axhn@manchmal.in-ulm.de> for the
 analysis.
Author: Raphaël Hertzog <hertzog@debian.org>
Bug-Debian: http://bugs.debian.org/841699
Last-Update: 2017-01-09
---
This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
diff --git a/etc/setup.d/15killprocs b/etc/setup.d/15killprocs
index 8630e89a..a37c4555 100755
--- a/etc/setup.d/15killprocs
+++ b/etc/setup.d/15killprocs
@@ -39,6 +39,7 @@ kill_proc()
 # $1: mount base location
 do_kill_all()
 {
+    chroot_path=$(realpath "$1")
     if [ -z "$1" ]; then
         fatal "No path for finding stray processes: not reaping processes in chroot"
     fi
@@ -48,11 +49,11 @@ do_kill_all()
     while read pid; do
         # Check if process root are the same device/inode as chroot
         # root (for efficiency)
-        if [ /proc/"$pid"/root -ef "$1" ]; then
+        if [ /proc/"$pid"/root -ef "$chroot_path" ]; then
             # Check if process and chroot root are the same (may be
             # different even if device/inode match).
-            root=$(readlink /proc/"$pid"/root || true)
-            if [ "$root" = "$1" ]; then
+            root=$(readlink --canonicalize /proc/"$pid"/root || true)
+            if [ "$root" = "$chroot_path" ]; then
                 exe=$(readlink /proc/"$pid"/exe || true)
                 info "Killing left-over pid $pid (${exe##$1})"
                 info "  Sending SIGTERM to pid $pid"