Re: [Xen-devel] [PATCH] hotplug/Linux: remove hotplug support, rely on udev instead

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-10-12 at 15:14 +0100, Olaf Hering wrote:
> Makefile                              |   1 -
>  README                                |   8 +++---
>  install.sh                            |  14 ------------
>  tools/hotplug/Linux/Makefile          |  34 +-----------------------------
>  tools/hotplug/Linux/xen-backend.agent |  39 
> -----------------------------------
>  5 files changed, 5 insertions(+), 91 deletions(-)
> 
> 
> # HG changeset patch
> # User Olaf Hering <olaf@xxxxxxxxx>
> # Date 1350048922 -7200
> # Node ID 597f0885494d0441b10c06938c62d50d4efb3fea
> # Parent  e0e1350dfe9b7a6cacb1378f75d8e6536d22eb2d
> hotplug/Linux: remove hotplug support, rely on udev instead
> 
> Hotplug has been replaced by udev since several years. Remove the
> hotplug related files and install udev unconditionally.
> 
> This makes it possible to remove udev from rpm BuildRequires which
> reduces the buildtime dependency chain. For openSuSE:Factory it was
> done just now:
> http://lists.opensuse.org/opensuse-buildservice/2012-10/msg00085.html
> 
> The patch by itself will have no practical impact unless someone
> attempts to build and run a Xen dom0 on a really old base system.

Does anyone have any idea what sort of timeframe hotplug agent stuff
really died in, just so we can document something?

RHEL5, SLES10 and Debian Stable all have udev AFAIK, which is about as
old as we care about for the dom0.

> Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> 
> diff -r e0e1350dfe9b -r 597f0885494d Makefile
> --- a/Makefile
> +++ b/Makefile
> @@ -223,7 +223,6 @@ uninstall:
>       $(MAKE) -C xen uninstall
>       rm -rf $(D)$(CONFIG_DIR)/init.d/xendomains $(D)$(CONFIG_DIR)/init.d/xend
>       rm -rf $(D)$(CONFIG_DIR)/init.d/xencommons 
> $(D)$(CONFIG_DIR)/init.d/xen-watchdog
> -     rm -rf $(D)$(CONFIG_DIR)/hotplug/xen-backend.agent
>       rm -f  $(D)$(CONFIG_DIR)/udev/rules.d/xen-backend.rules
>       rm -f  $(D)$(CONFIG_DIR)/udev/rules.d/xend.rules
>       rm -f  $(D)$(SYSCONFIG_DIR)/xendomains
> diff -r e0e1350dfe9b -r 597f0885494d README
> --- a/README
> +++ b/README
> @@ -54,7 +54,7 @@ provided by your OS distributor:
>      * pkg-config
>      * bridge-utils package (/sbin/brctl)
>      * iproute package (/sbin/ip)
> -    * hotplug or udev
> +    * udev
>      * GNU bison and GNU flex
>      * GNU gettext
>      * 16-bit x86 assembler, loader and compiler (dev86 rpm or bin86 & bcc 
> debs)
> @@ -120,9 +120,9 @@ 4. To rebuild an existing tree without m
>  
>     make install and make dist differ in that make install does the
>     right things for your local machine (installing the appropriate
> -   version of hotplug or udev scripts, for example), but make dist
> -   includes all versions of those scripts, so that you can copy the dist
> -   directory to another machine and install from that distribution.
> +   version of udev scripts, for example), but make dist includes all
> +   versions of those scripts, so that you can copy the dist directory
> +   to another machine and install from that distribution.
>     
>  Python Runtime Libraries
>  ========================
> diff -r e0e1350dfe9b -r 597f0885494d install.sh
> --- a/install.sh
> +++ b/install.sh
> @@ -27,20 +27,6 @@ tmp="`mktemp -d`"
>  echo "Installing Xen from '$src' to '$dst'..."
>  (cd $src; tar -cf - * ) | tar -C "$tmp" -xf -
>  
> -[ -x "$(which udevinfo)" ] && \
> -  UDEV_VERSION=$(udevinfo -V | sed -e 's/^[^0-9]* 
> \([0-9]\{1,\}\)[^0-9]\{0,\}/\1/')
> -
> -[ -z "$UDEV_VERSION" -a -x /sbin/udevadm ] && \
> -  UDEV_VERSION=$(/sbin/udevadm info -V | awk '{print $NF}')
> -
> -if [ -n "$UDEV_VERSION" ] && [ $UDEV_VERSION -ge 059 ]; then
> -  echo " - installing for udev-based system"
> -  rm -rf "$tmp/etc/hotplug"
> -else
> -  echo " - installing for hotplug-based system"
> -  rm -rf "$tmp/etc/udev"
> -fi
> -
>  echo " - modifying permissions"
>  chmod -R a+rX "$tmp"
>  
> diff -r e0e1350dfe9b -r 597f0885494d tools/hotplug/Linux/Makefile
> --- a/tools/hotplug/Linux/Makefile
> +++ b/tools/hotplug/Linux/Makefile
> @@ -27,32 +27,9 @@ XEN_SCRIPT_DATA += xen-hotplug-common.sh
>  XEN_SCRIPT_DATA += block-common.sh vtpm-common.sh vtpm-hotplug-common.sh
>  XEN_SCRIPT_DATA += vtpm-migration.sh vtpm-impl
>  
> -XEN_HOTPLUG_DIR = $(CONFIG_DIR)/hotplug
> -XEN_HOTPLUG_SCRIPTS = xen-backend.agent
> -
> -UDEVVER = 0
> -ifeq ($(shell [ -x /sbin/udevadm ] && echo 1),1)
> -UDEVVER = $(shell /sbin/udevadm info -V | sed -e 's/^[^0-9]* 
> \([0-9]\{1,\}\)[^0-9]\{0,\}/\1/' )
> -endif
> -ifeq ($(shell [ -x /usr/bin/udevinfo ] && echo 1),1)
> -UDEVVER = $(shell /usr/bin/udevinfo -V | sed -e 's/^[^0-9]* 
> \([0-9]\{1,\}\)[^0-9]\{0,\}/\1/' )
> -endif
> -
>  UDEV_RULES_DIR = $(CONFIG_DIR)/udev
>  UDEV_RULES = xen-backend.rules xend.rules
>  
> -DI = $(if $(DISTDIR),$(shell readlink -f $(DISTDIR)),)
> -DE = $(if $(DESTDIR),$(shell readlink -f $(DESTDIR)),)
> -ifeq ($(findstring $(DI),$(DE)),$(DI))
> -HOTPLUGS=install-hotplug install-udev
> -else
> -ifeq ($(shell [ $(UDEVVER) -ge 059 ] && echo 1),1)
> -HOTPLUGS=install-udev
> -else
> -HOTPLUGS=install-hotplug
> -endif
> -endif
> -
>  .PHONY: all
>  all:
>  
> @@ -60,7 +37,7 @@ all:
>  build:
>  
>  .PHONY: install
> -install: all install-initd install-scripts $(HOTPLUGS)
> +install: all install-initd install-scripts install-udev
>  
>  # See docs/misc/distro_mapping.txt for INITD_DIR location
>  .PHONY: install-initd
> @@ -87,15 +64,6 @@ install-scripts:
>           $(INSTALL_DATA) $$i $(DESTDIR)$(XEN_SCRIPT_DIR); \
>       done
>  
> -.PHONY: install-hotplug
> -install-hotplug:
> -     [ -d $(DESTDIR)$(XEN_HOTPLUG_DIR) ] || \
> -             $(INSTALL_DIR) $(DESTDIR)$(XEN_HOTPLUG_DIR)
> -     set -e; for i in $(XEN_HOTPLUG_SCRIPTS); \
> -         do \
> -         $(INSTALL_PROG) $$i $(DESTDIR)$(XEN_HOTPLUG_DIR); \
> -     done
> -
>  .PHONY: install-udev
>  install-udev:
>       [ -d $(DESTDIR)$(UDEV_RULES_DIR) ] || \
> diff -r e0e1350dfe9b -r 597f0885494d tools/hotplug/Linux/xen-backend.agent
> --- a/tools/hotplug/Linux/xen-backend.agent
> +++ /dev/null
> @@ -1,39 +0,0 @@
> -#! /bin/bash
> -
> -PATH=/etc/xen/scripts:$PATH
> -
> -. /etc/xen/scripts/locking.sh
> -
> -claim_lock xenbus_hotplug_global
> -
> -case "$XENBUS_TYPE" in
> -  tap)
> -    /etc/xen/scripts/blktap "$ACTION"
> -    ;;
> -  vbd)
> -    /etc/xen/scripts/block "$ACTION"
> -    ;;
> -  vtpm)
> -    /etc/xen/scripts/vtpm "$ACTION"
> -    ;;
> -  vif)
> -    [ -n "$script" ] && $script "$ACTION"
> -    ;;
> -  vscsi)
> -    /etc/xen/scripts/vscsi "$ACTION"
> -    ;;
> -esac
> -
> -case "$ACTION" in
> -  add)
> -    ;;
> -  remove)
> -    /etc/xen/scripts/xen-hotplug-cleanup
> -    ;;
> -  online)
> -    ;;
> -  offline)
> -    ;;
> -esac
> -
> -release_lock xenbus_hotplug_global
> 
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> Xen-devel@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel



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