[gentoo-catalyst] [PATCH 10/12] catalyst: Remove kill_support_pids()

[Matt Turner]

mount_namespaces(7) says

	A mount ceases to be a member of a peer group when either the
	mount is explicitly unmounted, or when the mount is implicitly
	unmounted because a mount namespace is removed (because it has
	no more member processes).

Now that the build sequence is executed in its own mount namespace, the
mounts are implicitly unmounted when the last process in the namespace
dies, meaning we don't need to try any funny business around cleaning up
processes in order to unmount.

Signed-off-by: Matt Turner <mattst88@g.o>
---
 catalyst/base/stagebase.py          | 30 ++------------
 targets/support/kill-chroot-pids.sh | 62 -----------------------------
 2 files changed, 4 insertions(+), 88 deletions(-)
 delete mode 100755 targets/support/kill-chroot-pids.sh

diff --git a/catalyst/base/stagebase.py b/catalyst/base/stagebase.py
index ec9a8f06..5fc11eae 100644
--- a/catalyst/base/stagebase.py
+++ b/catalyst/base/stagebase.py
@@ -638,17 +638,6 @@ class StageBase(TargetBase, ClearBase, GenBase):
             assert self.settings[verify] == "blake2"
             self.settings.setdefault("gk_mainargs", []).append("--b2sum")
 
-    def kill_chroot_pids(self):
-        log.info('Checking for processes running in chroot and killing them.')
-
-        # Force environment variables to be exported so script can see them
-        self.setup_environment()
-
-        killcmd = normpath(self.settings["sharedir"] +
-                           self.settings["shdir"] + "/support/kill-chroot-pids.sh")
-        if os.path.exists(killcmd):
-            cmd([killcmd], env=self.env)
-
     def mount_safety_check(self):
         """
         Check and verify that none of our paths in mypath are mounted. We don't
@@ -920,18 +909,10 @@ class StageBase(TargetBase, ClearBase, GenBase):
             try:
                 cxt = libmount.Context(target=str(target))
                 cxt.umount()
-            except OSError:
-                log.warning('First attempt to unmount failed: %s', target)
-                log.warning('Killing any pids still running in the chroot')
-
-                self.kill_chroot_pids()
-
-                try:
-                    cxt.umount()
-                except OSError as e:
-                    umount_failed = True
-                    log.warning("Couldn't umount: %s, %s", target,
-                                e.strerror)
+            except OSError as e:
+                log.warning("Couldn't umount: %s, %s", target,
+                            e.strerror)
+                umount_failed = True
 
         if umount_failed:
             # if any bind mounts really failed, then we need to raise
@@ -1382,9 +1363,6 @@ class StageBase(TargetBase, ClearBase, GenBase):
     def run(self):
         self.chroot_lock.write_lock()
 
-        # Kill any pids in the chroot
-        self.kill_chroot_pids()
-
         # Check for mounts right away and abort if we cannot unmount them
         self.mount_safety_check()
 
diff --git a/targets/support/kill-chroot-pids.sh b/targets/support/kill-chroot-pids.sh
deleted file mode 100755
index ea8ee402..00000000
--- a/targets/support/kill-chroot-pids.sh
+++ /dev/null
@@ -1,62 +0,0 @@
-#!/bin/bash
-# Script to kill processes found running in the chroot.
-
-if [ "${clst_chroot_path}" == "/" ]
-then
-	echo "Aborting .... clst_chroot_path is set to /"
-	echo "This is very dangerous"
-	exit 1
-fi
-
-if [ "${clst_chroot_path}" == "" ]
-then
-	echo "Aborting .... clst_chroot_path is NOT set"
-	echo "This is very dangerous"
-	exit 1
-fi
-
-j=0
-declare -a pids
-# Get files and dirs in /proc
-for i in `ls /proc`
-do
-	# Test for directories
-	if [ -d /proc/$i ]
-	then
-	# Search for exe containing string inside ${clst_chroot_path}
-	ls -la --color=never /proc/$i 2>&1 |grep exe|grep ${clst_chroot_path} > /dev/null
-
-	# If found
-	if [ $? == 0 ]
-	then
-		# Assign the pid into the pids array
-		pids[$j]=$i
-		j=$(($j+1))
-	fi
-	fi
-done
-
-if [ ${j} -gt 0 ]
-then
-	echo
-	echo "Killing process(es)"
-	echo "pid: process name"
-	for pid in ${pids[@]}
-	do
-		P_NAME=$(ls -la --color=never /proc/${pid} 2>&1 |grep exe|grep ${clst_chroot_path}|awk '{print $11}')
-		echo ${pid}: ${P_NAME}
-	done
-	echo
-	echo "Press Ctrl-C within 10 seconds to abort"
-
-	sleep 10
-
-	for pid in ${pids[@]}
-	do
-		kill -9 ${pid}
-	done
-
-	# Small sleep here to give the process(es) a chance to die before running unbind again.
-	sleep 5
-
-fi
-- 
2.26.2