imagemagick: add replay_build.sh (#13692)

Adds a targeted version of `replay_build.sh`. Targeted meaning that the
first argument to the bash script (`$1`) is the only harness that is
recompiled.

We rely on the `make_build_replayable.py` wrappers for all of the
recompilation except the harness itself. Only a single harness is build.

```
imagemagick: Compile times: Vanilla=356; Replay=47;
```

Signed-off-by: David Korczynski <david@adalogics.com>

Author: DavidKorczynski

projects/imagemagick/Dockerfile

@@ -36,4 +36,4 @@ RUN git clone --depth 1 --recursive https://github.com/libjxl/libjxl
 RUN git clone https://www.cl.cam.ac.uk/~mgk25/git/jbigkit # does not support shallow
 ADD https://lcamtuf.coredump.cx/afl/demo/afl_testcases.tgz afl_testcases.tgz
 WORKDIR imagemagick
-COPY build.sh run_tests.sh $SRC/
+COPY build.sh run_tests.sh replay_build.sh $SRC/

projects/imagemagick/replay_build.sh

@@ -0,0 +1,98 @@
+#!/bin/bash -eux
+# Copyright 2025 Google LLC.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+##############################################################################
+
+# Prepare wrappers to make recompilation faster.
+if [ ! -f /usr/bin/bash.real ]; then
+  # Only run this once.
+  python /usr/local/bin/make_build_replayable.py
+fi
+
+
+MAGICK_COMPILER=$CXX
+MAGICK_COMPILER_FLAGS=$CXXFLAGS
+MAGICK_INCLUDE="$WORK/include/ImageMagick-7"
+MAGICK_SRC="$SRC/imagemagick/oss-fuzz"
+MAGICK_LIBS_NO_FUZZ="$WORK/lib/libMagick++-7.Q16HDRI.a $WORK/lib/libMagickWand-7.Q16HDRI.a $WORK/lib/libMagickCore-7.Q16HDRI.a $WORK/lib/libpng.a $WORK/lib/libtiff.a $WORK/lib/libheif.a $WORK/lib/libde265.a $WORK/lib/libopenjp2.a $WORK/lib/libwebp.a $WORK/lib/libwebpmux.a $WORK/lib/libwebpdemux.a $WORK/lib/libsharpyuv.a $WORK/lib/libhwy.a $WORK/lib/libbrotlicommon.a $WORK/lib/libbrotlidec.a $WORK/lib/libbrotlienc.a $WORK/lib/libjxl_threads.a $WORK/lib/libjxl_cms.a $WORK/lib/libjxl.a $WORK/lib/libturbojpeg.a $WORK/lib/libjpeg.a $WORK/lib/libfreetype.a $WORK/lib/libraw.a $WORK/lib/liblzma.a $WORK/lib/liblcms2.a $WORK/lib/libdeflate.a $WORK/lib/libz.a"
+MAGICK_LIBS="$LIB_FUZZING_ENGINE $MAGICK_LIBS_NO_FUZZ"
+MAGICK_OUTPUT=$OUT
+MAGICK_FAST_BUILD=0
+
+. $MAGICK_SRC/build_dependencies.sh
+. $MAGICK_SRC/build_imagemagick.sh
+
+# Move on the building the fuzzers
+MAGICK_COMPILER_FLAGS="$MAGICK_COMPILER_FLAGS -fuse-ld=lld -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16"
+
+$MAGICK_COMPILER $MAGICK_COMPILER_FLAGS -std=c++11 -I$MAGICK_INCLUDE "$MAGICK_SRC/encoder_list.cc" \
+    -o "$MAGICK_SRC/encoder_list" $MAGICK_LIBS_NO_FUZZ
+
+
+# Control the target fuzzer from the command line. Hardcoded below commented
+# out is for testing purposes, and to illustrate the logic behind it.
+# TARGET_FUZZER="encoder_sgi_fuzzer"
+TARGET_FUZZER=$1
+
+for f in $MAGICK_SRC/*_fuzzer.cc; do
+    fuzzer=$(basename "$f" _fuzzer.cc)
+    out_fuzzname=$(basename "$f" .cc)
+    echo "Real fuzz name: ${out_fuzzname}"
+    # encoder_fuzzer is special
+    if [ "$fuzzer" == "encoder" ]; then
+        continue
+    fi
+    if [ "$out_fuzzname" != "$TARGET_FUZZER" ]; then
+        continue
+    fi
+    $MAGICK_COMPILER $MAGICK_COMPILER_FLAGS -std=c++11 -I$MAGICK_INCLUDE \
+        "$f" -o "$MAGICK_OUTPUT/${fuzzer}_fuzzer" $MAGICK_LIBS &
+    echo -e "[libfuzzer]\nclose_fd_mask=3" > "$MAGICK_OUTPUT/${fuzzer}_fuzzer.options"
+done
+
+for item in $("$MAGICK_SRC/encoder_list"); do
+    info=${item:1}
+    encoder=${info%:*}
+    initializer=${info##*:}
+    encoder_flags="-DFUZZ_IMAGEMAGICK_ENCODER=$encoder"
+    out_fuzzname="encoder_${encoder,,}_fuzzer"
+    if [ "$out_fuzzname" != "$TARGET_FUZZER" ]; then
+        continue
+    fi
+
+    if [ "$initializer" != "" ]; then
+      encoder_flags="$encoder_flags -DFUZZ_IMAGEMAGICK_ENCODER_INITIALIZER=$initializer"
+    fi
+
+    if [ "${item:0:1}" == "+" ]; then
+        encoder_flags="$encoder_flags -DFUZZ_IMAGEMAGICK_ENCODER_WRITE=1"
+    fi
+
+    $MAGICK_COMPILER $MAGICK_COMPILER_FLAGS -std=c++11 -I$MAGICK_INCLUDE \
+        "$MAGICK_SRC/encoder_fuzzer.cc" -o "$MAGICK_OUTPUT/encoder_${encoder,,}_fuzzer" \
+         $encoder_flags $MAGICK_LIBS &
+
+    echo -e "[libfuzzer]\nclose_fd_mask=3" > "$MAGICK_OUTPUT/encoder_${encoder,,}_fuzzer.options"
+
+    if [ -f "$MAGICK_SRC/dictionaries/${encoder,,}.dict" ]; then
+        cp "$MAGICK_SRC/dictionaries/${encoder,,}.dict" "$MAGICK_OUTPUT/encoder_${encoder,,}_fuzzer.dict"
+    fi
+
+    if [ $MAGICK_FAST_BUILD -eq 1 ]; then
+        break
+    fi
+done
+
+wait