From 549e39bd6f399459d3bd4318a0e1ac305237a57d Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Mon, 12 Dec 2016 12:54:28 +0100
Subject: makekernel now supports compiling from git

---
 makekernel.in | 70 ++++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 53 insertions(+), 17 deletions(-)

diff --git a/makekernel.in b/makekernel.in
index 8a788d2..e2dfb02 100644
--- a/makekernel.in
+++ b/makekernel.in
@@ -66,6 +66,7 @@ allowDownload=false
 forceVersion=false
 showVersion=false
 noAction=false
+hasGit="[ -d "${kernelDir}/.git" ]"
 
 while true
 do
@@ -73,6 +74,7 @@ do
     -a|--allowDownload)
       ${allowDownload} && usage
       ${showVersion} && usage
+      ${hasGit} && usage
       allowDownload=true
     ;;
     -c|--compileVersion)
@@ -108,19 +110,29 @@ done
 
 if ${showVersion}
 then
-  mainVersion="$(
-    curl 'https://cdn.kernel.org/pub/linux/kernel/' 2> /dev/null | \
-      tr '>/' '\n' | \
-      grep '^v.*$' | \
+  if ${hasGit}
+  then
+    git -C "${kernelDir}" fetch --all --tags &> /dev/null
+    git -C "${kernelDir}" tag --list | \
+      grep '^v[0-9.]\+$' | \
+      sed 's|^v||' | \
       sort -V | \
       tail -n1
-  )"
-  curl "https://cdn.kernel.org/pub/linux/kernel/${mainVersion}/" 2> /dev/null | \
-    tr '<>' '\n\n' | \
-    grep '^linux-.*\.tar\.xz$' | \
-    sed 's/^linux-\(.*\)\.tar\.xz$/\1/' | \
-    sort -V | \
-    tail -n1
+  else
+    mainVersion="$(
+      curl 'https://cdn.kernel.org/pub/linux/kernel/' 2> /dev/null | \
+        tr '>/' '\n' | \
+        grep '^v.*$' | \
+        sort -V | \
+        tail -n1
+    )"
+    curl "https://cdn.kernel.org/pub/linux/kernel/${mainVersion}/" 2> /dev/null | \
+      tr '<>' '\n\n' | \
+      grep '^linux-.*\.tar\.xz$' | \
+      sed 's/^linux-\(.*\)\.tar\.xz$/\1/' | \
+      sort -V | \
+      tail -n1
+  fi
   exit 0
 fi
 
@@ -146,7 +158,12 @@ fi
 # alternative (if allowed):
 #  - download complete source
 
-if [ -d "${kernelDir}/linux-${curVer}" ]
+if ${hasGit}
+then
+  updateType='git'
+  patchSrc=''
+  dlSrch=''
+elif [ -d "${kernelDir}/linux-${curVer}" ]
 then
   updateType='recompile'
   patchSrc=''
@@ -185,7 +202,16 @@ fi
 cd "${kernelDir}"
 echo "update type: ${updateType}"
 
-if [ -n "${patchSrc}" ]
+if ${hasGit}
+then
+  if ${noAction}
+  then
+    echo "verify and checkout git tag 'v${curVer}'"
+  else
+    git verify-tag "v${curVer}"
+    git checkout "v${curVer}"
+  fi
+elif [ -n "${patchSrc}" ]
 then
   dlExVer "${patchSrc}" "${patch}"
   if ${noAction}
@@ -211,13 +237,18 @@ if ${noAction}
 then
   echo "copy config (can't say, from where, right now)"
 else
-  cd "${kernelDir}/linux-${curVer}"
+  if ${hasGit}
+  then
+    cd "${kernelDir}"
+  else
+    cd "${kernelDir}/linux-${curVer}"
+  fi
   [ ! -r .config ] && zcat /proc/config.gz > .config
 fi
 
 if ${noAction}
 then
-  echo "make clean"
+  ${hasGit} || echo "make clean"
   echo "make oldconfing"
   echo "make"
   echo "possibly: make modules_install"
@@ -228,12 +259,17 @@ then
   echo "  grub-mkconfig -o /boot/grub/grub.cfg &&"
   echo "  after_install_hook"
 else
-  make clean
+  ${hasGit} || make clean
   make oldconfig
   make
   grep -q '^# CONFIG_MODULES is not set$' .config || make modules_install
 
-  kernelImg="$(find ${kernelDir}/linux-${curVer}/arch/ -type f -iname '*image')"
+  if ${hasGit}
+  then
+    kernelImg="$(find ${kernelDir}/arch/ -type f -iname '*image')"
+  else
+    kernelImg="$(find ${kernelDir}/linux-${curVer}/arch/ -type f -iname '*image')"
+  fi
   if [ $(echo "${kernelImg}" | wc -l) -ne 1 ]
   then
     >&2 echo 'ERROR: Did not find exactly one compiled kernel image:'
-- 
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