From 65b0f80a5cdef74e59327504dd1fc2cebf7dc9d8 Mon Sep 17 00:00:00 2001
From: Xunlei Pang <xpang@redhat.com>
Date: Mon, 6 Jun 2016 13:01:44 +0800
Subject: [PATCH] kdump-lib: Add get_ifcfg_filename() to get the proper ifcfg
 file

Previously, we assumed the ifcfg file of a network "interface" is
"/etc/sysconfig/network-scripts/ifcfg-<interface>", but actually
it is not the case.

For example, for network interface "enp0s25", we are able to
generate like "/etc/sysconfig/network-scripts/ifcfg-enp0s25-test"
for it via network-manager.

The "suffix" in "ifcfg-<suffix>" is actually a "configuration"
name not "interface" name, though normally we use the "interface"
name as its "configuration" name. You can refer to "man ifup"
for some detail.

So, this patch adds some assistant helpers to acquire the right
ifcfg file for an interface. Borrow some logic from script below:
"/etc/sysconfig/network-scripts/network-functions"

Signed-off-by: Xunlei Pang <xlpang@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
---
 kdump-lib.sh | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)

diff --git a/kdump-lib.sh b/kdump-lib.sh
index fc2c036..66f2f0d 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -279,3 +279,106 @@ is_hostname()
     fi
     echo $1 | grep -q "[a-zA-Z]"
 }
+
+# Copied from "/etc/sysconfig/network-scripts/network-functions"
+get_hwaddr()
+{
+    if [ -f "/sys/class/net/${1}/address" ]; then
+        awk '{ print toupper($0) }' < /sys/class/net/${1}/address
+    elif [ -d "/sys/class/net/${1}" ]; then
+       LC_ALL= LANG= ip -o link show ${1} 2>/dev/null | \
+            awk '{ print toupper(gensub(/.*link\/[^ ]* ([[:alnum:]:]*).*/,
+                                        "\\1", 1)); }'
+    fi
+}
+
+get_ifcfg_by_device()
+{
+    grep -E -i -l "^[[:space:]]*DEVICE=\"*${1}\"*[[:space:]]*$" \
+         /etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
+}
+
+get_ifcfg_by_hwaddr()
+{
+    grep -E -i -l "^[[:space:]]*HWADDR=\"*${1}\"*[[:space:]]*$" \
+         /etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
+}
+
+get_ifcfg_by_uuid()
+{
+    grep -E -i -l "^[[:space:]]*UUID=\"*${1}\"*[[:space:]]*$" \
+         /etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
+}
+
+get_ifcfg_by_name()
+{
+    grep -E -i -l "^[[:space:]]*NAME=\"*${1}\"*[[:space:]]*$" \
+         /etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
+}
+
+is_nm_running()
+{
+    [ "$(LANG=C nmcli -t --fields running general status 2>/dev/null)" = "running" ]
+}
+
+is_nm_handling()
+{
+    LANG=C nmcli -t --fields device,state  dev status 2>/dev/null \
+          | grep -q "^\(${1}:connected\)\|\(${1}:connecting.*\)$"
+}
+
+# $1: netdev name
+get_ifcfg_nmcli()
+{
+    local nm_uuid nm_name
+    local ifcfg_file
+
+    # Get the active nmcli config name of $1
+    if is_nm_running && is_nm_handling "${1}" ; then
+        # The configuration "uuid" and "name" generated by nm is wrote to
+        # the ifcfg file as "UUID=<nm_uuid>" and "NAME=<nm_name>".
+        nm_uuid=$(LANG=C nmcli -t --fields uuid,device c show --active 2>/dev/null \
+                  | grep "${1}" | head -1 | cut -d':' -f1)
+        nm_name=$(LANG=C nmcli -t --fields name,device c show --active 2>/dev/null \
+                  | grep "${1}" | head -1 | cut -d':' -f1)
+        ifcfg_file=$(get_ifcfg_by_uuid "${nm_uuid}")
+        [ -z "${ifcfg_file}" ] && ifcfg_file=$(get_ifcfg_by_name "${nm_name}")
+    fi
+
+    echo -n "${ifcfg_file}"
+}
+
+# $1: netdev name
+get_ifcfg_legacy()
+{
+    local ifcfg_file
+
+    ifcfg_file="/etc/sysconfig/network-scripts/ifcfg-${1}"
+    [ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return
+
+    ifcfg_file=$(get_ifcfg_by_name "${1}")
+    [ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return
+
+    local hwaddr=$(get_hwaddr "${1}")
+    if [ -n "$hwaddr" ]; then
+        ifcfg_file=$(get_ifcfg_by_hwaddr "${hwaddr}")
+        [ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return
+    fi
+
+    ifcfg_file=$(get_ifcfg_by_device "${1}")
+
+    echo -n "${ifcfg_file}"
+}
+
+# $1: netdev name
+# Return the ifcfg file whole name(including the path) of $1 if any.
+get_ifcfg_filename() {
+    local ifcfg_file
+
+    ifcfg_file=$(get_ifcfg_nmcli "${1}")
+    if [ -z "${ifcfg_file}" ]; then
+        ifcfg_file=$(get_ifcfg_legacy "${1}")
+    fi
+
+    echo -n "${ifcfg_file}"
+}