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#!/bin/bash

# This script is called by uscan(1) as:
# get-hg-version --upstream-version <version>

# We create a temporary directory, clone the upstream repository into it,
# check out the current upstream version, tar this directory, and then
# copy it to the parent directory in place of the existing downloaded
# .orig.tar.gz file.

if [ "$1" != "--upstream-version" ]
then
    echo "Script called with unexpected arguments: $*" >&2
    echo "Expected $0 --upstream-version <uversion>" >&2
    exit 1
fi

if ! hg --version > /dev/null
then
    echo 'Need to install the "mercurial" package to run uscan on ruamel.yaml.clib' >&2
    exit 1
fi

PACKAGE=ruamel.yaml
PACKAGE_DASH=ruamel-yaml
PWD=$(pwd)
cd ..
PPWD=$(pwd)
TMP=$(mktemp -d)
trap "rm -rf '$TMP'" INT QUIT TERM EXIT

uversion=$2
cd "$TMP"

hg clone http://hg.code.sf.net/p/${PACKAGE_DASH}/code $PACKAGE-$uversion
cd $PACKAGE-$uversion
hg update $uversion
cd ..
mv $PACKAGE-$uversion $PACKAGE-$uversion+ds
tar Jcpf ${PACKAGE}_$uversion+ds.orig.tar.xz --exclude=.hg $PACKAGE-$uversion+ds
rm -f "$PPWD"/${PACKAGE}_$uversion.orig.tar.gz
mv ${PACKAGE}_$uversion+ds.orig.tar.xz "$PPWD"
cd "$PWD"
rm -rf "$TMP"

trap - INT QUIT TERM EXIT