#35 somewhat hacky patch for fast shutdown, just sync filesystems and halt after docker shutdown

Signed-off-by: Justin Cormack <justin.cormack@docker.com>
2025-07-20 17:49:10 +00:00 · 2016-02-19 14:53:23 +00:00 · 2016-02-19 14:53:23 +00:00 · f0afaf3074
commit f0afaf3074
parent 64ff2d2b15
1 changed files with 87 additions and 0 deletions
--- a/alpine/packages/docker/etc/init.d/docker
+++ b/alpine/packages/docker/etc/init.d/docker
@ -41,3 +41,90 @@ depend()
        after 9pudc transfused
        before chronyd
 }
+
+stop()
+{
+	# stop docker
+	start-stop-daemon --stop --quiet --pidfile ${pidfile}
+
+	# taken from localmount stop script
+
+        yesno $RC_GOINGDOWN || return 0
+        # We never unmount / or /dev or $RC_SVCDIR
+
+        # Bug 381783
+        local rc_svcdir=$(printf '%s\n' "$RC_SVCDIR" | sed 's:/lib\(32\|64\)\?/:/lib(32|64)?/:g')
+
+        local x= no_umounts_r="/|/dev|/dev/.*|${rc_svcdir}"
+        no_umounts_r="${no_umounts_r}|/bin|/sbin|/lib(32|64)?|/libexec"
+        # RC_NO_UMOUNTS is an env var that can be set by plugins
+        local IFS="$IFS:"
+        for x in $no_umounts $RC_NO_UMOUNTS; do
+                no_umounts_r="$no_umounts_r|$x"
+        done
+
+        if [ "$RC_UNAME" = Linux ]; then
+                no_umounts_r="$no_umounts_r|/proc|/proc/.*|/run|/sys|/sys/.*"
+                if [ -e "$rc_svcdir"/usr_premounted ]; then
+                        no_umounts_r="$no_umounts_r|/usr"
+                fi
+        fi
+        no_umounts_r="^($no_umounts_r)$"
+
+        # Flush all pending disk writes now
+        sync
+
+        . "$RC_LIBEXECDIR"/sh/rc-mount.sh
+
+        if [ "$RC_UNAME" = Linux ] && [ -d /sys/fs/aufs ] ; then
+                #if / is aufs we remount it noxino during shutdown
+                if mountinfo -q -f '^aufs$' / ; then
+                        mount -o remount,noxino,rw /
+                        sync
+                fi
+
+                local aufs_branch aufs_mount_point aufs_si_id aufs_br_id branches
+                for aufs_si_dir in /sys/fs/aufs/si*; do
+                        [ -d "${aufs_si_dir}" ] || continue
+                        aufs_si_id="si=${aufs_si_dir#/sys/fs/aufs/si_}"
+                        aufs_mount_point="$(mountinfo -o ${aufs_si_id})"
+                        branches="$aufs_si_dir/br[0-9] $aufs_si_dir/br[0-9][0-9] $aufs_si_dir/br[0-9][0-9][0-9]"
+                        for x in $branches; do
+                                [ -e "${x}" ] || continue
+                                aufs_branch=$(sed 's/=.*//g' $x)
+                                eindent
+                                if ! mount -o "remount,del:$aufs_branch" "$aufs_mount_point" > /dev/null 2>&1; then
+                                        ewarn "Failed to remove branch $aufs_branch from aufs \
+                                        $aufs_mount_point"
+                                fi
+                                eoutdent
+                                sync
+                        done
+                done
+        fi
+
+        # Umount loop devices
+        einfo "Unmounting loop devices"
+        eindent
+        do_unmount "umount -d" --skip-point-regex "$no_umounts_r" \
+                --node-regex "^/dev/loop"
+        eoutdent
+
+        # Now everything else, except network filesystems as the
+        # network should be down by this point.
+        einfo "Unmounting filesystems"
+        eindent
+        local fs=
+        for x in $net_fs_list $extra_net_fs_list; do
+                fs="$fs${fs:+|}$x"
+        done
+        [ -n "$fs" ] && fs="^($fs)$"
+        do_unmount umount --skip-point-regex "$no_umounts_r" \
+                "${fs:+--skip-fstype-regex}" $fs --nonetdev
+        eoutdent
+
+	# now terminate with extreme prejudice
+	halt -f
+
+        return 0
+}