From d8e6f99642b91ed34695ab6bd9f814418614321d Mon Sep 17 00:00:00 2001
From: "T. Joseph Carter" <iKarith@users.noreply.github.com>
Date: Fri, 23 Oct 2015 05:12:55 -0700
Subject: [PATCH] Add fix tool

---
 docs/ivanx/fix/index.txt | 114 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 docs/ivanx/fix/index.txt

diff --git a/docs/ivanx/fix/index.txt b/docs/ivanx/fix/index.txt
new file mode 100644
index 0000000..ec8f000
--- /dev/null
+++ b/docs/ivanx/fix/index.txt
@@ -0,0 +1,114 @@
+#!/bin/bash
+
+echo
+echo "A2SERVER fix: This utility will make a Raspberry Pi SD card boot if it"
+echo "kernel panics (crashes) on startup after updating its operating system"
+echo "while A2SERVER is installed."
+echo
+echo -n "Continue? "
+read
+doFix=
+if [[ ${REPLY:0:1} == "y" || ${REPLY:0:1} == "Y" ]]; then
+    while true; do
+        echo
+        echo "If attached, remove the Raspberry Pi's SD card from this computer."
+        echo -n "Press return to continue..."; read; echo
+
+        ls -1 /dev/sd? > /tmp/sd1 2> /dev/null
+
+        echo "Insert the Raspberry Pi's SD card into this computer, using a USB"
+        echo "reader if you don't have an SD slot. If this is a virtual machine,"
+        echo "make sure you select the reader or SD slot from its USB menu."
+        echo -n "Press return to continue..."; read; echo
+
+        ls -1 /dev/sd? > /tmp/sd2 2> /dev/null
+        
+        # if exactly one drive has been inserted, exit loop
+        if { ! diff /tmp/sd1 /tmp/sd2 &> /dev/null; }; then
+            # files are different, get dev name
+            if [[ $(wc -c /tmp/sd1 | cut -f 1 -d ' ') -eq 0 ]]; then
+                if [[ $(wc -l /tmp/sd2 | cut -f 1 -d ' ') -eq 1 ]]; then
+                    devName=$(cat /tmp/sd2)
+                    break
+                else
+                    echo "More than one volume seems to have appeared. Trying again..."
+                    echo
+                fi
+            else
+                devName=$(grep -v "$(cat /tmp/sd1)" /tmp/sd2)
+                if [[ $(wc -l <<< $devName) -eq 1 ]]; then
+                    break
+                else
+                    echo "More than one volume seems to have appeared. Trying again..."
+                    echo
+                fi
+            fi
+        else
+            echo "No SD card found. Trying again..."
+            echo
+        fi
+        
+    done
+    
+    mkdir -p /tmp/sd
+    sudo mount ${devName}6 /tmp/sd
+
+    raspbianDate=$(date -d "$(zcat /tmp/sd/usr/share/doc/raspberrypi-bootloader/changelog.Debian.gz | grep -m 1 ' --' | rev | cut -f 1-6 -d ' ' | rev)" +%s)
+    doFix=
+    if [[ $raspbianDate -lt 1403204265 ]]; then
+        echo "This doesn't appear to be a version of Raspbian that requires fixing."
+        echo -n "Are you sure you want to continue? "
+        read
+        if [[ ${REPLY:0:1} == "y" || ${REPLY:0:1} == "Y" ]]; then
+            doFix=1
+        fi
+    else
+        doFix=1
+    fi
+
+    if [[ $doFix ]]; then
+        while read kernelRelease; do
+            kernelReplaced=
+            kernelMajorRelease=$(cut -d '.' -f 1  <<< $kernelRelease)
+            kernelMinorRelease=$(cut -d '.' -f 2  <<< $kernelRelease | sed 's/\(^[0-9]*\)[^0-9].*$/\1/')
+            kernelPatchRelease=$(cut -d '.' -f 3- <<< $kernelRelease | sed 's/\(^[0-9]*\)[^0-9].*$/\1/')
+            # if kernel 3.12 below 3.12.25+, delete defective AppleTalk kernel
+            if [[ $kernelMajorRelease -eq 3 && $kernelMinorRelease -eq 12 && $kernelPatchRelease -lt 25 ]]; then
+                if [[ -f /tmp/sd/lib/modules/$kernelRelease/kernel/net/appletalk/appletalk.ko ]]; then
+                    if [[ $(sha1sum /tmp/sd/lib/modules/$kernelRelease/kernel/net/appletalk/appletalk.ko | cut -f 1 -d ' ') != "ecb239fc084c36de93f6926e7749b80f6024f269" ]]; then
+                        echo "Removing defective AppleTalk module from kernel $kernelRelease..."
+                        sudo rm -rf /tmp/sd/lib/modules/$kernelRelease/kernel/net/appletalk 2> /dev/null
+                        wget -qO /tmp/appletalk.ko.gz appleii.ivanx.com/a2server/files/appletalk-$kernelRelease.ko.gz
+                        if [[ $? -eq 0 ]]; then
+                            # if we found a prebuilt one on a2server site, so install it
+                            gunzip -f /tmp/appletalk.ko.gz
+                            sudo mkdir -p /tmp/sd/lib/modules/$kernelRelease/kernel/net/appletalk
+                            sudo mv /tmp/appletalk.ko /tmp/sd/lib/modules/$kernelRelease/kernel/net/appletalk
+                            echo "Installed fixed AppleTalk module for kernel $kernelRelease."
+                            kernelReplaced=1
+                        fi
+                    fi
+                fi
+            fi
+        done <<< "$(ls -1 /tmp/sd/lib/modules | sort -V)"
+        sudo umount /tmp/sd
+        
+        echo kern:$kernelReplaced
+        if [[ $kernelReplaced ]]; then
+            echo
+            echo "All set. Remove your SD card, put it back in your Pi, and boot it."
+            echo
+            echo "You should be able to connect from your Apple II, but if you can't,"
+            echo "log in to your Pi and type 'a2server-setup' to complete the fix."
+        else
+            echo
+            echo "Okey doke. Half done. Remove your SD card, and put it back in your Pi."
+            echo "After it boots, log in and type 'a2server-setup' to complete the fix."
+        fi        
+        echo "See the A2SERVER web site at http://ivanx.com/a2server for more help."
+        echo "(You can type 'sudo shutdown -h now' if you're done on this machine.)"
+        echo
+    fi
+fi
+
+rm fix &> /dev/null