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#!/bin/sh
if [ $# -gt 1 ]; then
cd "$2"
fi
if [ $# -gt 0 ]; then
FILE="$1"
shift
if [ -f "$FILE" ]; then
INFO="$(head -n 1 "$FILE")"
fi
else
echo "Usage: $0 <filename> <srcroot>"
exit 1
fi
TIME=$(date '+%F %T %z')
if [ -e "$(which git)" -a -d ".git" ]; then
# clean 'dirty' status of touched files that haven't been modified
git diff >/dev/null 2>/dev/null
# get a string like "v0.6.0-66-g59887e8-dirty"
DESC="$(git describe --dirty 2>/dev/null)"
# get a string like "2012-04-10 16:27:19 +0200"
TIME="$(git log -n 1 --format="%ci")"
fi
if [ -n "$DESC" ]; then
NEWINFO="#define BUILD_DESC \"$DESC\""
else
NEWINFO="// No build information available"
fi
# only update build.h if necessary
if [ "$INFO" != "$NEWINFO" ]; then
echo "$NEWINFO" >"$FILE"
echo "#define BUILD_DATE \"$TIME\"" >>"$FILE"
fi
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