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tag: v1.2.0
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#!/bin/sh
#
# This is included in commands that either have to be run from the toplevel
# of the repository, or with GIT_DIR environment variable properly.
# If the GIT_DIR does not look like the right correct git-repository,
# it dies.

# Having this variable in your environment would break scripts because
# you would cause "cd" to be be taken to unexpected places. If you
# like CDPATH, define it for your interactive shell sessions without
# exporting it.
unset CDPATH

die() {
echo >&2 "$@"
exit 1
}

usage() {
die "Usage: $0 $USAGE"
}

if [ -z "$LONG_USAGE" ]
then
LONG_USAGE="Usage: $0 $USAGE"
else
LONG_USAGE="Usage: $0 $USAGE

$LONG_USAGE"
fi

case "$1" in
--h|--he|--hel|--help)
echo "$LONG_USAGE"
exit
esac

if [ -z "$SUBDIRECTORY_OK" ]
then
: ${GIT_DIR=.git}
: ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}

# Make sure we are in a valid repository of a vintage we understand.
GIT_DIR="$GIT_DIR" git repo-config --get core.nosuch >/dev/null
if test $? = 128
then
exit
fi
else
GIT_DIR=$(git-rev-parse --git-dir) || exit
fi
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