1 files changed, 72 insertions, 0 deletions
diff --git a/update-kernel-config b/update-kernel-config
new file mode 100755
index 0000000..37e414c
--- /dev/null
+++ b/update-kernel-config
@@ -0,0 +1,72 @@
+#!/bin/bash
+
+if [ $# -ne 2 ]; then
+  >&2 echo 'usage: update-kernel-config [repository] [kernel-name]'
+  exit 2
+fi
+
+old_revision=$(
+  sed -n '
+    s/^# upstream git\( revision\)\?: *//
+    T
+    p
+  ' "/usr/src/archlinux32/packages/$1/$2/PKGBUILD"
+)
+
+if [ -z "${old_revision}" ]; then
+  >&2 echo 'Cannot detemine old upstream git revision.'
+  >&2 echo '"# upstream git revision: ..." line is missing.'
+  exit 1
+fi
+
+diff=$(
+  git -C "/usr/src/archlinux/packages/$2/repos/$1-x86_64" diff "${old_revision}" HEAD -- config | \
+    grep '^[+-].' | \
+    grep -v '^+++\|^---'
+)
+
+if [ -z "${diff}" ]; then
+  >&2 echo 'nothing changed.'
+  exit 1
+fi
+
+{
+  grep -vxF "$(
+    printf '%s\n' "${diff}" | \
+      sed -n '
+        s/^-//
+        T
+        p
+      '
+  )" "/usr/src/archlinux32/packages/$1/$2/config"
+  printf '%s\n' "${diff}" | \
+    sed -n '
+      s/^+//
+      T
+      p
+    '
+} | \
+  sponge "/usr/src/archlinux32/packages/$1/$2/config"
+
+sed -i '
+  1 s/^#.*$/# upstream git revision: '"$(
+    git -C "/usr/src/archlinux/packages" rev-parse HEAD
+  )"'/
+  s/'"$(
+    git -C "/usr/src/archlinux/packages/$2/repos/$1-x86_64" archive "${old_revision}" -- config | \
+      tar -Ox | \
+      sha256sum | \
+      awk '{print $1}'
+  )"'/'"$(
+    git -C "/usr/src/archlinux/packages/$2/repos/$1-x86_64" archive HEAD -- config | \
+      tar -Ox | \
+      sha256sum | \
+      awk '{print $1}'
+  )"'/g
+  s/'"$(
+    git -C "/usr/src/archlinux32/packages/$1/$2" archive HEAD -- config | \
+      tar -Ox | \
+      sha256sum | \
+      awk '{print $1}'
+  )"'/SKIP/g
+' "/usr/src/archlinux32/packages/$1/$2/PKGBUILD"