#!/bin/bash

set -e

cd linux

git reset --hard

echo "! Repo $(git config remote.origin.url) $(git describe) $(git rev-parse HEAD) ok"

function vercmp()
{
    v1=${1#v}
    op=$2
    v2=${3#v}

    # Make release candidates sort before the final release
    v1=${v1/rc/\~}
    v2=${v2/rc/\~}

    dpkg --compare-versions $v1 $op $v2
}

if git rev-list --ancestry-path 0b05e2d671c40cfb57e66e4e402320d6e056b2f8..1cd03890ea64795e53f17a94928cca22495acb2a^|grep -q $(git rev-parse HEAD); then
    # Revert commit that causes unbootable system (v4.2-rc2-34-g0b05e2d)
    git revert --no-edit 0b05e2d671c40cfb57e66e4e402320d6e056b2f8 # powerpc/32: cacheable_memcpy becomes memcpy
    git reset HEAD^ # Do not commit revert - this helps with bisecting
fi

if git rev-list --ancestry-path 990486c8af044f89bddfbde1d1cf9fde449bedbf^..7a5692e6e533fd379081ab06fb58f3f5ee4d80bc^|grep -q $(git rev-parse HEAD); then
    # Revert commit that causes compile error (v4.3-rc4-3-g990486c)
    git revert --no-edit 990486c8af044f89bddfbde1d1cf9fde449bedbf # strscpy: zero any trailing garbage bytes in the destination
    git reset HEAD^ # Do not commit revert - this helps with bisecting
fi

if git rev-list --ancestry-path 7322dd755e7dd34bc5359aa27abeed1687e0f628^..v4.6^|grep -q $(git rev-parse HEAD); then
    # Revert commit that causes compile error. This error seems to be
    # caused by a compiler bug (see the message of the reverted
    # commit) and is magically fixed by an unrelated commit merged
    # before v4.6 (commit 20decb7e486d7eefff3931f58d092d2d7c024a1c
    # "drivers: net: xgene: Fix error handling")
    git revert --no-edit 7322dd755e7dd34bc5359aa27abeed1687e0f628 # byteswap: try to avoid __builtin_constant_p gcc bug
    git reset HEAD^ # Do not commit revert - this helps with bisecting
fi

if git rev-list --ancestry-path 9402c684613163888714df0955fa1f17142b08bf^..2c0f99516f53911c3f2f81ab3815841e3408f11e^|grep -q $(git rev-parse HEAD); then
    # Apply fix for commit that breaks boot
    git apply --index <<EOF
--- a/arch/powerpc/lib/feature-fixups.c
+++ b/arch/powerpc/lib/feature-fixups.c
@@ -154,3 +154,3 @@ static void do_final_fixups(void)
 {
-	struct cpu_spec *spec = *PTRRELOC(&cur_cpu_spec);
+	struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec));
 
EOF
fi

if git rev-list --ancestry-path 309b315b6ec686ce050758cc4e29f6ad1125a83f^..97f6e0cc35026a2a09147a6da636d901525e1969^; then
    git show 97f6e0cc35026a2a09147a6da636d901525e1969 | git apply --index
fi

# It the dts file exists, next command fails
rm -f arch/powerpc/boot/dts/shark-ryu.dts
git apply --index < ../shark-ryu-board-patch.patch