nixpkgs/pkgs/build-support/fetchmtn/builder.sh

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source $stdenv/setup
set -x
if ! [ -f "$cacheDB" ]; then
echo "Creating cache DB $cacheDB"
mtn --db "$cacheDB" db init
fi
header "getting revision $selector";
done=;
for source in $dbs; do
if mtn pull --debug --db "$cacheDB" "$source" "${branch}"; then
revision="$(mtn --db "$cacheDB" au toposort $(mtn --db "$cacheDB" au select "$selector") | tail -1)";
if [ -n "$revision" ]; then
if mtn --db "$cacheDB" au get_revision "$revision"; then
echo "found revision $revision"
done=1;
else
echo "revision $revision does not exist";
fi
else
echo "selector $selector does not match any revision";
fi
else
echo "pulling branch $branch wasn't succesfull";
fi;
if test -n "$done"; then
break;
fi;
done;
stopNest;
header "checking out the revision $revision";
if test -n "$done"; then
mtn checkout --db "$cacheDB" -r "$revision" "$out" -b "${branch}"
else
echo "Needed revision still not found. Exiting";
exit 1;
fi;
stopNest