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+#!@BINDIR@/bash
+#
+# The example hook script to store the metadata information of version
+# controlled files (with each commit) using the `metastore' program.
+#
+# Copyright (C) 2016 Przemyslaw Pawelczyk <przemoc@gmail.com>
+# Copyright (C) 2018-2020 Mohammad Akhlaghi <mohammad@akhlaghi.org>
+#
+# WARNING:
+#
+# If the commit is aborted (e.g. by not entering any synopsis),
+# then updated metastore file (.metadata by default) is not reverted,
+# so its new version remains in the index.
+# To undo any changes in metastore file written since HEAD commit,
+# you may want to reset and checkout HEAD version of the file:
+#
+# git reset HEAD -- .metadata
+# git checkout HEAD -- .metadata
+#
+# This script is taken from the `examples/hooks/pre-commit' file of the
+# `metastore' package (installed within the project, with an MIT license
+# for copyright). Here, the name of the `MSFILE' and also set special
+# characters for the installation location of meta-store so our own
+# installation is found by Git.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to permit
+# persons to whom the Software is furnished to do so, subject to the
+# following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+# NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+# USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+# File containig the metadata and metastore executable.
+MSFILE=".file-metadata"
+MSBIN=@BINDIR@/metastore
+
+# If metastore is not installed, then ignore this script (exit with a
+# status of 0).
+if [ ! -f $MSBIN ]; then exit 0; fi
+
+# Function to help in reporting a crash.
+exit_on_fail() {
+ "$@"
+ if [ $? -ne 0 ]; then
+ echo "Failed to execute: $@" >&2
+ exit 1
+ fi
+}
+
+# Run metastore.
+exit_on_fail \
+ $MSBIN -O @USER@ -G @GROUP@ -s -f "$MSFILE"
+
+# If it's first metastore commit, store again to include $MSFILE in $MSFILE.
+if ! git-ls-tree --name-only HEAD 2>/dev/null | grep -Fqx "$MSFILE"; then
+ exit_on_fail \
+ $MSBIN -O @USER@ -G @GROUP@ -s -f "$MSFILE"
+fi
+
+# Check if the metadata file exists.
+if [ ! -e "$MSFILE" ]; then
+ echo "\"$MSFILE\" missing" >&2
+ exit 1
+fi
+
+# Add the metadata file to the Git repository.
+exit_on_fail \
+ git-add "$MSFILE"
+
+# Return with a success code (0).
+exit 0