揪到VMware一个BUG，吼开心
接上回《VMware Horizon Linux 云桌面 USB重定向配置》说，起初我为了省事儿，手动编译了kernel之后成功安装了VHCI驱动，实现了USB重定向功能。放手就没在管DKMS的事儿。然而，雷埋下了早晚要炸。没过几天，我随手就是一个apt update便更新了内核，VHCI驱动自然也掉了。按官网的手册一步一步部署DKMS并安装VHCI模块。安装完成之后，再次安装viewagent，得到一下报错：
Failed to install USB redirection module, because the system doesn't meet the following requirement(s): VHCI driver should be installed. USB Redirection depends on the VHCI module, and Horizon Agent does not contain the compiled VHCI module for cuurent Linux kernel 4.15.0-96-generic. Please build your own VHCI module and install it to Linux kernel. Please refer to product guide for detailed information.
可是我已经按照手册用DKMS安装了最新kernel对应的module，用modinfo也能查得到：
[root@ubuntu ~] modinfo usb-vhci-iocifc filename: /lib/modules/4.15.0-99-generic/updates/dkms/usb-vhci-iocifc.ko version: 1.15.0 license: GPL author: Michael Singer <michael@a-singer.de> description: User-mode IOCTL-interface for USB VHCI driver srcversion: 697AFFF0CE7CA15B5597E50 depends: usb-vhci-hcd retpoline: Y name: usb_vhci_iocifc vermagic: 4.15.0-99-generic SMP mod_unload
此处省略N多尝试……
打开install_viewagent.sh，通过搜索报错文字"VHCI driver should be installed."定位到函数verify_usb_environment这里。在文件2956行处。BUG就在这里。
verify_usb_environment()
{
local arch="`uname -i`"
local meet_all_requirements="yes"
local meet_arch="no"
local meet_libudev="no"
local meet_vhci="yes"
local version=
if [ "${arch}" = "x86_64" ]; then
meet_arch="yes"
verify_udev_environment
if [ "$?" = "0" ];then
meet_libudev="yes"
fi
fi
if [ "${meet_libudev}" = "yes" ]; then
stat /lib/modules/`uname -r`/kernel/drivers/usb/host/usb-vhci-hcd.ko > /dev/null 2>&1 && \
stat /lib/modules/`uname -r`/kernel/drivers/usb/host/usb-vhci-iocifc.ko > /dev/null 2>&1
if [ "$?" = "0" ]; then
version="`modinfo -F"version" usb-vhci-iocifc`"
if [ "$version" != "1.15.0" ]; then
echo_term "Error: VHCI modules installed in the system maybe not the correct version. Please refer to product guide to install VHCI"
exit
fi
else
extract_vhci
if [ "$?" = "0" ]; then
echo_term "Warning: USB Redirection depends on the VHCI module, and Horizon Agent contains the compiled VHCI module for cuurent Linux kernel `uname -r`."
echo_term " Installing VHCI driver ..."
echo_term " You need compile your own VHCI module and install it to Linux kernel if you upgrade or downgrade Linux kernel after Horizon Agent installation."
echo_term " Please refer to product guide for detailed information."
else
meet_vhci="no"
fi
fi
fi
if [ "${meet_arch}" = "no" ] ||
[ "${meet_vhci}" = "no" ] ||
[ "${meet_libudev}" = "no" ]; then
meet_all_requirements="no"
fi
if [ "${meet_all_requirements}" = "no" ]; then
echo_term -n "Failed to install USB redirection module, "
echo_term "because the system doesn't meet the following requirement(s):"
error_num=1
if [ "${meet_arch}" = "no" ]; then
echo_term "The USB feature has only been supported on the 64-bit system currently."
fi
if [ "${meet_vhci}" = "no" ]; then
echo_term "VHCI driver should be installed."
echo_term "USB Redirection depends on the VHCI module, and Horizon Agent does not contain the compiled VHCI module for cuurent Linux kernel `uname -r`."
echo_term "Please build your own VHCI module and install it to Linux kernel."
echo_term "Please refer to product guide for detailed information."
fi
if [ "${meet_libudev}" = "no" ]; then
echo_term "libudev.so.0 should be installed."
fi
exit
else
echo_log "The host system meets the USB requirements."
fi
}可以分析出安装脚本是判断一下两个文件是否存在来确定VHCI是否安装（文件2974行）：
stat /lib/modules/`uname -r`/kernel/drivers/usb/host/usb-vhci-hcd.ko > /dev/null 2>&1 && \ stat /lib/modules/`uname -r`/kernel/drivers/usb/host/usb-vhci-iocifc.ko > /dev/null 2>&1
再看dkms.conf中的配置：
PACKAGE_NAME="usb-vhci-hcd" PACKAGE_VERSION=1.15 MAKE_CMD_TMPL="make KVERSION=$kernelver" CLEAN="$MAKE_CMD_TMPL clean" BUILT_MODULE_NAME[0]="usb-vhci-iocifc" DEST_MODULE_LOCATION[0]="/kernel/drivers/usb/host" MAKE[0]="$MAKE_CMD_TMPL" BUILT_MODULE_NAME[1]="usb-vhci-hcd" DEST_MODULE_LOCATION[1]="/kernel/drivers/usb/host" MAKE[1]="$MAKE_CMD_TMPL" AUTOINSTALL="YES"
通过modinfo得到的信息显示模块虽然被安装了但是并没有放置到指定的位置"/kernel/drivers/usb/host"，而是将自动安装的模块放置到了"/updates/dkms/"下，查找了一番资料发现DKMS在Debian系的发行版系统中，即使你定义了DEST_MODULE_LOCATION也会将其重写成"/updates/dkms/"并将模块放置在"/updates/dkms/"目录下。install_viewagent.sh中并没有检测这个目录，产生了我在Ubuntu下通过DKMS安装了VHCI模块，但是脚本显示没有安装了逻辑错误。可见VMware在测试时并没有测试Ubuntu或者说是Ubuntu下用DKMS安装VHCI模块这一场景。
我给出的解决方法就是把"/updates/dkms/"目录下的两个.ko模块文件cp到"/kernel/drivers/usb/host"中去就可以了。安装可以正常安装。
对于这个BUG的看法：其实没必要用stat /lib/modules/`uname -r`/kernel/drivers/usb/host/usb-vhci-iocifc.ko去检查模块文件是否存在，直接用modinfo -F"version" usb-vhci-iocifc去检测模块版本就行了，如果模块安装了便会得到模块版本号，没有正确安装则会得到报错。
ViewAgent版本：
VMware-horizonagent-linux-x86_64-7.12.0-15765535.tar.gz
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