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#!/bin/sh
set -e

case "$DGIT_ABSURD_DEBUG" in
''|0)	exec 3>/dev/null ;;
1)	exec 3>>../../gbp-pq-output ;;
*)	exec 3>>../../gbp-pq-output 2>&3 ;;
esac

log () {
	echo >&3 "DGIT ABSURD GIT APPLY (DEBUG)  $*"
	echo >&2 "DGIT ABSURD GIT APPLY (STDERR) $*"
}

fail () {
	log "FAILED: $*"
	exit 127
}

self=${0%/*}
npath=${PATH#$self:}
if test "x$PATH" = "x$npath"; then
	fail "PATH FILTER FAIL ($0 $self $PATH)"
fi

bypass=true
for arg in "$@"; do
	case "$arg" in
	apply)	bypass=false; break	;;
	-*)				;;
	*)	bypass=true; break	;;
	esac
done

if $bypass; then
	PATH=$npath
	echo >&3 "DGIT ABSURD GIT APPLY - BYPASS: $*"
	exec git "$@"
fi

log "NO BYPASS: $*"

case "$DGIT_ABSURD_DEBUG" in
''|0|1) ;;
*)	set -x ;;
esac

#exec >/dev/tty 2>&1

index=0
noo=0

for arg in "$@"; do
	case "$noo.$arg" in
	1.--index)
		index=1
		continue
		;;
	1.--whitespace=fix)
		continue
		;;
	?.-*)
		fail "UNKNOWN OPTION $arg ($*)"
		;;
	0.apply)
		;;
	1.*)	patch="$arg"
		;;
	*)
		fail "BAD USAGE $arg ($noo $*)"
	esac
	noo=$(( $noo + 1 ))
done

if [ $noo != 2 ]; then
	fail "NO PATCH ($*)"
fi

pwd=`pwd`
patch=${patch#$pwd/debian/patches/}
rm -f debian/patches/series

# Work around #848611.
# We need a stunt filename which the source package must not
# contain.  A trick is to use the commit hash of HEAD, whose
# hash value cannot appear in any file in its own tree.
omgwtf="dgit-omg-wtf-$(git rev-parse HEAD)"
cat <<END >debian/patches/$omgwtf
---
--- a/$omgwtf	2016-10-31 23:28:47.314155919 +0000
+++ b/$omgwtf	2016-12-18 22:40:01.870058270 +0000
@@ -0,0 +1 @@
+:
END
printf "%s\n" "$omgwtf" >debian/patches/series
printf "%s\n" "$patch" >>debian/patches/series

dpkg-source --before-build .

rm -f $omgwtf debian/patches/$omgwtf

rm -rf .pc
git checkout debian/patches/series
git add -Af .

log "APPLIED $patch"
#printf 'APPLIED '; date --iso-8601=ns