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GNU GENERAL PUBLIC LICENSE
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src_dir := ./src
docs_dir := ./docs
tests_dir := ./tests
build_dir := ./build
docs_build_dir := ./build/docs
.PHONY: help tests docs
help:
@echo Usage: make TARGET
@echo
@echo Available targets:
@echo
@echo 'help print this help message'
@echo 'tests run tests from $(tests_dir)'
@echo 'docs build documentation from $(docs_dir)'
@echo
@echo See README.rst for more info
tests:
# See bats(1), https://bats-core.readthedocs.io/en/latest/index.html
for test in $(tests_dir)/*.bats; do bats --verbose-run --print-output-on-failure "$$@" "$$test"; done
docs: builddir
# See rst2man(1), rst2html(1), https://docutils.sourceforge.io/docs/index.html
rst2man $(docs_dir)/baf.1.rst | gzip -9 > $(docs_build_dir)/baf.1
rst2html $(docs_dir)/baf.1.rst > $(docs_build_dir)/baf.1.html
builddir:
mkdir -p $(build_dir)
mkdir -p $(docs_build_dir)

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Testing
=======
Baf uses amazing test suite: https://bats-core.readthedocs.io/
Install Bats::
git clone https://github.com/bats-core/bats-core.git
bash bats-core/install.sh ~/.local
Add some Bats extensions::
git clone https://github.com/bats-core/bats-assert.git tests/helpers/bats-assert
git clone https://github.com/bats-core/bats-support.git tests/helpers/bats-support
Run tests::
make tests
Building
========
Build docs (manpage and HTML)::
make docs

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===
baf
===
----------------------------------
backup automation micro-framework.
----------------------------------
:Copyright: \(C) 2022, ge <https://nixhacks.net/>, GPLv3+
:Manual section: 1
Синопсис
--------
``baf`` [options] [<arguments>]
Описание
--------
Baf это утилита для резервного копирования на основе сценариев Bash. По умолчанию предусмотрено создание полных резервных копий файлов и баз данных MySQL и PostgreSQL, но функционал может быть расширен в сценариях при помощи пользовательских функций.
Опции
-----
-h, --help print help text and exit.
-v, --version print version and exit.
Основы
------
Baf это седство для полного резервного копирования и может быть использован как микро-фреймворк для написания сценариев резервного копирования.
Baf не реализует собственный язык сценариев, а полагается на Bash. В любом варианте применения Baf требует написания сценария для выполнения бэкапа.
В сценариях можно использовать переменные и функции. Сценарий импортируется Baf с помощью команды `source` (см. ``bash``\(1) п. SHELL BUILTIN COMMANDS).
Простейший сценарий резервного копирования выглядит следующим образом::
sources=('file:/home/user')
targets=('file:/var/backup')
Здесь массивы `sources` и `targets` определяют точки (`points`) резервного копирования — источники (`sources`) и назначения (`targets`). Это основные сущности, с которыми работает Baf. Вот некоторые особенности точек:
- Все точки указываются в формате URI (см. RFC 3986). Описание URI также есть в этой документации ниже.ы
- Точки могут указывать как на локальные (размещённые на текущей машине), так и на удалённые (размещённые на удалённой машине) ресурсы.
- Можно указать как несколько источников, так и несколько назначений.
Для выполнения бэкапа директорий или отдельных файлов применяется схема URI `file`. В схеме `file` нельзя указать директорию, размещённую на удалённом хранилище (за исключением случая, когда удалённое хранилище примонтировано как файловая система), для этого используйте другие схемы. В примере выше будет выполнена резервная копия локальной директории /home/user в другую локальную директорию /var/backup. Поскольку в сценарии из примера нет ничего, кроме указания точек `sources` и `targets`, бэкап будет выполнен с параметрами по умолчанию: директория /home/user будет заархивирована с помощью утилиты ``tar``\(1), архив будет сжат с помощью утилиты ``gzip``\(1) и помещён в директорию /var/backup. Имя архива будет сложено из строки::
${name_prefix}${name}_%Y%m%d-%H%M${file_ext}
Здесь:
``${name_prefix}``
Переменная, значение которой соответствует имени файла сценария (без расширения).
``${name}``
Имя архивируемой директории/файла (``basename``\(1)).
``%Y%m%d-%H%M``
Дата, интерпретируемая утилитой ``date``\(1).
``${file_ext}``
Расширение имени файла, соответствующее формату архива. По умолчанию ".tar.gz".
Обзор URI
---------
Источники (`sources`) и назначения (`targets`) должны быть указаны в виде URI. Это позовляет наглядно в одной сроке видеть весь набор данных. Парсер реализует поддержку следующего синтаксиса URI::
scheme:[//[username[:password]@][hostname[:port]]/[path]?[query]#[fragment]
Парсер URI соответствует RFC 3986 не полностью - разбиение на составные части URI происходит верно, но интерпретация отдельных ситуаций может отличаться. См. примеры URI и реузультаты их интерпретации парсером в файле `tests/parse_uri.bats`. На практике рекомендую придерживаться примеров, которые приведены ниже и в файле `tests/parse_uri.bats`. В случае, если изменение логики парсера необходимо, вы можете прислать правки в pull-реквесте или завести feature-реквест в репозитории проекта.
Примеры URI для массива `sources`::
mysql://wordpress:1jobrRRjtLYs@localhost/wordpress
postgres://django:9%3F2%3D%40gHW@localhost:5432:/django
sqlite:///var/www/app/data/database.db
file:///var/www/html/
Примеры URI для `targets`::
file:/var/backup
ftp://jhon:%24t%D0%AFo%7C%5C%7C6@[fe80::5054:ff:fe24:382]:2021/backups/
rsync://backup_user@192.168.3.12:2022/backups
s3://my_bucket
Пароли содержащие специальные символы недопустимые в URI (включая пробелы) необходимо закодировать в percent code.
Python 2::
python2 -c "import urllib, sys; print urllib.quote(sys.argv[1], safe='')" 'PA$$WORD'
Python 3::
python3 -c "import urllib.parse, sys; print(urllib.parse.quote(sys.argv[1], safe=''))" 'PA$$WORD'
Perl 5::
echo 'PA$$WORD' | perl -MURI::Escape -wlne 'print uri_escape $_'
Поддерживаемые протоколы и схемы URI
------------------------------------
Схемы, которые могут быть использованы как sources
``````````````````````````````````````````````````
file
Может содержать путь к локальному файлу или директории. Файлы архивируются при помощи ``tar`` и по умолчанию сжимаются с помощью ``gzip``. Примеры::
file:/var/www/html
file:///home/jhon/cool_stuff.txt
mysql
URI содержит реквизиты для подключения к БД MySQL/MariaDB. Формат::
mysql://[username[:password]@]hostname[:port]/database
С помощью утилиты ``mysqldump``\(1) формируется дамп в формате SQL, файл по умолчанию сжимается утилитой ``gzip``.
postgres
Аналогично `mysql`, но для PostgreSQL. Для создания дампа используется ``pg_dump``\(1), файлы по умолчанию сохраняются с расширением ".psql.gz".
sqlite
Схема для баз данных SQLite. Ничем не отличается от `file`, добавлена для наглядного обозначения, что источником является БД SQLite, а не иной файл.
Схемы, которые могут быть использованы как targets
``````````````````````````````````````````````````
file
См. описание выше. В контексте `targets` указывает директорию для сохранения архивов с файлами и базами данных.
ftp
Для выполнения загрузки файлов на удалённый FTP-сервер используется утилита GNU ``ftp``\(1).
sftp
OpenSSH File Transfer Protocol.
rsync
Rsync.
s3
Amazon S3 or any S3-compatible storage.
swift
OpenStack Swift.
sj
Storj DCS.
dav, davs
WebDAV.
Создание резервных копий
------------------------
Baf предполагает, что для всех резервных копий необходимо создавать архивы. Поэтому вам нужно следить за тем, чтобы в локальном хранилище всегда хватало дискового пространства для создания новых архивов. Baf также не удаляет старые архивы и вам также надо позаботиться об удалении устаревших резервных копий. Изменить это поведение можно с помощью пользовательских функций в сценариях. В этом разделе речь пойдёт о поведении, которое установлено в Baf по умолчанию.
Базовая концепция строится на том, что существует несколько точек источников и несколько точек назначения. Создаётся резервная копия источника и копируется в точку назначения.
Для всех источников в сценарии выполняется локальная резервная копия. После этого локальная копия переносится в удалённые точки назначения, если они заданы. Копирование локального бэкапа будет осуществлёно столько раз, сколько точек назначения задано. В каждом сценарии обязательно должен быть задан хотя бы один источник и одна точка назначения. При этом в списке точек назначения обязательно должна присутствовать точка со схемой `file`. Именно в неё будут сохранены архивы.
Пример. Имеется следующий сценарий::
sources=(
'mysql://wordpress:1jobrRRjtLYs@localhost/wordpress'
'file:///var/www/wordpress'
)
targets=(
'file:///var/backup'
'ftp://jhon:%24t%D0%AFo%7C%5C%7C6@[fe80::5054:ff:fe24:382]:2021/backups/'
)
Здесь будут созданы архивы файлов и базы данных и сохранены в локальную директорию /var/backup. Затем эти файлы будут переданы по протоколу FTP на сервер fe80::5054:ff:fe24:382 в директорию /backups. Файлы из директории /var/backup не будут удалены или перемещены. Если добавить дополнительную точку назначения, то файлы из /var/backup будут скопированы и туда. Обратите внимание, что Baf не выполняет повторного создания архивов для каждой точки назначения — архивы создаются один раз и далее распространяются по всем указанным назначениям. Если в массиве `targets` имеется несколько точек назначения со схемой `file`, то архивы будут сохранены в первую по порядку точку, а затем скопированы оттуда в остальные.
Потребление ресурсов
--------------------
Избегайте указания в одном сценарии точек назначения, которые ведут на примонтированный к локальной машине сетевой диск и другое удалённое хранилище одновременно. В таком случае архивы будут создаваться сразу на сетевом диске, что может существенно замедлить скорость их создания. Также при копировании файлов в другое удалённое хранилище будет выполняться двойная работа по сети, что тоже будет очень медленным.
Резервное копирование на удалённое хранилище
--------------------------------------------
FTP
```
SFTP
````
Rsync over SSH
``````````````
Rsync with rsyncd
`````````````````
Amazon S3
`````````
S3 compatible storage
`````````````````````
OpenStack Swift
```````````````
Storj DCS
`````````
WebDAV
``````
Переменные в сценариях
----------------------
Библиотека функций
------------------
Использование функций в сценариях
---------------------------------
See also
--------
``bash``\(1), ``tar``\(1), ``date``\(1), ``mysqldump``\(1), ``pg_dump``\(1)
RFC 3986 https://datatracker.ietf.org/doc/html/rfc3986

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#! /usr/bin/env bash
# baf -- backup automation micro-framework.
# Copyright (c) 2022 ge <https://nixhacks.net/>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
baf_version='0.0.0'
BAFLIB="./lib"
# Source library
. ${BAFLIB}/*
print_help() {
cat <<- EOF
Backup files and databases.
Usage: $0 [-hv] <arguments>..
Options:
-h, --help print this help message and exit.
-v, --version print version and exit.
EOF
}
# Print help if no arguments passed
[[ "$@" ]] || { print_help; exit 1; }
# Transform long options to short ones
for arg in "$@"; do
shift
case "$arg" in
--help) set -- "$@" "-h";;
--version) set -- "$@" "-v";;
*) set -- "$@" "$arg";;
esac
done
# Parse short options
while getopts ":hvS" opt; do
case "$opt" in
h) print_help; exit 0;;
v) echo "$buf_version"; exit 0;;
*) echo "Unknown option $opt" >&2; exit 1;;
esac
done
# Parse positional arguments
shift $(($OPTIND - 1))
while (( "$#" )); do
case "$1" in
*) posargs+=("$1"); shift;; # Save args
esac
done

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#! /usr/bin/env bash
# parse_uri.sh - URI parser function (mostly compatible with RFC3986).
# Copyright (c) 2022 ge <https://nixhacks.net/>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
parse_uri() {
# Universal URI parser. There is fantastic shitcode, but it works.
# Refer RFC3986: https://datatracker.ietf.org/doc/html/rfc3986
# URL-encoded passwords supported.
#
# Usage: parse_uri URI
# Return variables:
# scheme
# username
# password
# hostname
# port
# path
# query
# fragment
local uri="$1"
# * Get scheme
scheme="$(<<< "$uri" cut -d ':' -f 1)"
# * Get authority component
# The absence of two slashes (//) after the scheme means that the path
# component follows, not the authority.
if [[ "$uri" =~ ${scheme}:[^//] ]]; then
local authority=
else
# Fix 'scheme://host' test failure
# Correctly detect authority component if empty path is set
if <<< "$uri" sed 's/\/\///g' | grep / &>/dev/null; then
# URI contain non empty path component
local authority="$(<<< "$uri" grep -Po '(?<=//)(.[^/]+)(?=/)')"
else
# If URI don/t contain path starts with "/"
local authority="$(<<< "$uri" grep -Po '(?<=//)(.[^/]+)$')"
fi
fi
# * Get host and userinfo components if authority is set.
if [[ "$authority" =~ @ ]]; then
local userinfo="$(<<< "$authority" cut -d '@' -f 1)"
local host="$(<<< "$authority" cut -d '@' -f 2)"
else
local userinfo=
local host="$authority"
fi
# * Get fragment
fragment="$(<<< "$uri" grep -Po '(?<=#)(.*)')" || true
# * Get query
query="$(<<< "$uri" grep -Po '(?<=\?)(.*)' | sed "s/#${fragment}//g")" || true
# * Get path
if [[ "$uri" =~ ^${scheme}:// ]]; then
path="$(<<< "$uri" sed "s/${scheme}:\/\/${authority//\[/\\[}//g")"
path="$(<<< "$path" sed "s/\?${query}//g;s/#${fragment}//g")"
# Dirty hack for 'schema://host:~/path'
if [[ "$uri" =~ :~/ ]]; then
path="~${path}"
fi
else
# For non authority component URI
path="$(<<< "$uri" sed "s/${scheme}://g")"
fi
# * Get hostname and port
local ipv6_hostname="$(<<< "$host" grep -Po '\[(.*)\]')"
if [ "$ipv6_hostname" ]; then
hostname="$ipv6_hostname"
port="$(<<< "$host" awk -F ']:' '{print $2}')"
elif [[ "$host" =~ : ]]; then
hostname="$(<<< "$host" cut -d ':' -f 1)"
port="$(<<< "$host" cut -d ':' -f 2)"
# Dirty hack for 'schema://host:~/path'
if [[ "$port" == '~' ]]; then
port=
fi
else
hostname="$host"
port=
fi
# * Get username and password
if [[ "$userinfo" =~ : ]]; then
username="$(<<< "$userinfo" cut -d ':' -f 1)"
password="$(<<< "$userinfo" cut -d ':' -f 2)"
else
username="$userinfo"
password=
fi
# Debug
# echo "SCHEME=<$scheme>"
# echo "AUTHORITY=<$authority>"
# echo "USERINFO=<$userinfo>"
# echo "USERNAME=<$username>"
# echo "PASSWORD=<$password>"
# echo "HOST=<$host>"
# echo "HOSTNAME=<$hostname>"
# echo "PORT=<$port>"
# echo "PATH=<$path>"
# echo "QUERY=<$query>"
# echo "FRAGMENT=<$fragment>"
# Decode URL-encoded password
if [ "$password" ]; then
password="$(<<< "$password" sed 's/+/ /g;s/%/\\\\x/g' | xargs echo -e)"
fi
}

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#! /usr/bin/env bats
# lib/parse_uri.sh tests.
# See: https://bats-core.readthedocs.io/en/latest/index.html
setup() {
# Bats setup
load 'helpers/bats-support/load'
load 'helpers/bats-assert/load'
DIR="$( cd "$( dirname "$BATS_TEST_FILENAME" )" >/dev/null 2>&1 && pwd )"
PATH="$DIR/../src/lib:$PATH"
}
# ------------------------------ #
# Do tests! #
# ------------------------------ #
@test "Test file:/" {
. parse_uri.sh
parse_uri 'file:/'
[ "$scheme" == 'file' ]
[ "$hostname" == '' ]
[ "$port" == '' ]
[ "$path" == '/' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test file:/path" {
. parse_uri.sh
parse_uri 'file:/path'
[ "$scheme" == 'file' ]
[ "$hostname" == '' ]
[ "$port" == '' ]
[ "$path" == '/path' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test file:///" {
. parse_uri.sh
parse_uri 'file:///'
[ "$scheme" == 'file' ]
[ "$hostname" == '' ]
[ "$port" == '' ]
[ "$path" == '/' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test sqlite:///path" {
. parse_uri.sh
parse_uri 'sqlite:///path'
[ "$scheme" == 'sqlite' ]
[ "$hostname" == '' ]
[ "$port" == '' ]
[ "$path" == '/path' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test file://host" {
. parse_uri.sh
parse_uri 'file://host'
[ "$scheme" == 'file' ]
[ "$hostname" == 'host' ]
[ "$port" == '' ]
[ "$path" == '' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test s3://host/path" {
. parse_uri.sh
parse_uri 's3://host/path'
[ "$scheme" == 's3' ]
[ "$hostname" == 'host' ]
[ "$port" == '' ]
[ "$path" == '/path' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test dav://user@host/" {
. parse_uri.sh
parse_uri 'dav://user@host/'
[ "$scheme" == 'dav' ]
[ "$hostname" == 'host' ]
[ "$port" == '' ]
[ "$path" == '/' ]
[ "$username" == 'user' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test dav://user:p%40%24%24w0rD@host/path/" {
. parse_uri.sh
parse_uri 'dav://user:p%40%24%24w0rD@host/path/'
[ "$scheme" == 'dav' ]
[ "$hostname" == 'host' ]
[ "$port" == '' ]
[ "$path" == '/path/' ]
[ "$username" == 'user' ]
[ "$password" == 'p@$$w0rD' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test rsync://user:password@host:~/backups" {
. parse_uri.sh
parse_uri 'rsync://user:password@host:~/backups'
[ "$scheme" == 'rsync' ]
[ "$hostname" == 'host' ]
[ "$port" == '' ]
[ "$path" == '~/backups' ]
[ "$username" == 'user' ]
[ "$password" == 'password' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test postgres://user:password@host:5432" {
. parse_uri.sh
parse_uri 'postgres://user:password@host:5432'
[ "$scheme" == 'postgres' ]
[ "$hostname" == 'host' ]
[ "$port" == '5432' ]
[ "$path" == '' ]
[ "$username" == 'user' ]
[ "$password" == 'password' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test http://user:password@host:port/path?q=val" {
. parse_uri.sh
parse_uri 'scheme://user:password@host:123/path?q=val'
[ "$scheme" == 'scheme' ]
[ "$hostname" == 'host' ]
[ "$port" == '123' ]
[ "$path" == '/path' ]
[ "$username" == 'user' ]
[ "$password" == 'password' ]
[ "$query" == 'q=val' ]
[ "$fragment" == '' ]
}
@test "Test ftp://user:%24t%D0%AFo%7C%5C%7C6@[fe80::5054:ff:fe24:382]:2021/srv/" {
. parse_uri.sh
parse_uri 'ftp://user:%24t%D0%AFo%7C%5C%7C6@[fe80::5054:ff:fe24:382]:2021/srv/'
[ "$scheme" == 'ftp' ]
[ "$hostname" == '[fe80::5054:ff:fe24:382]' ]
[ "$port" == '2021' ]
[ "$path" == '/srv/' ]
[ "$username" == 'user' ]
[ "$password" == '$tЯo|\|6' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
# ------------------------------ #
# Test RFC 3986 Examples #
# ------------------------------ #
@test "Test https://john.doe@www.example.com:123/forum/questions/?tag=networking&order=newest#top" {
. parse_uri.sh
parse_uri 'https://john.doe@www.example.com:123/forum/questions/?tag=networking&order=newest#top'
[ "$scheme" == 'https' ]
[ "$hostname" == 'www.example.com' ]
[ "$port" == '123' ]
[ "$path" == '/forum/questions/' ]
[ "$username" == 'john.doe' ]
[ "$password" == '' ]
[ "$query" == 'tag=networking&order=newest' ]
[ "$fragment" == 'top' ]
}
@test "Test ldap://[2001:db8::7]/c=GB?objectClass?one" {
. parse_uri.sh
parse_uri 'ldap://[2001:db8::7]/c=GB?objectClass?one'
[ "$scheme" == 'ldap' ]
[ "$hostname" == '[2001:db8::7]' ]
[ "$port" == '' ]
[ "$path" == '/c=GB' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == 'objectClass?one' ]
[ "$fragment" == '' ]
}
@test "Test mailto:John.Doe@example.com" {
. parse_uri.sh
parse_uri 'mailto:John.Doe@example.com'
[ "$scheme" == 'mailto' ]
[ "$hostname" == '' ]
[ "$port" == '' ]
[ "$path" == 'John.Doe@example.com' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test news:comp.infosystems.www.servers.unix" {
. parse_uri.sh
parse_uri 'news:comp.infosystems.www.servers.unix'
[ "$scheme" == 'news' ]
[ "$hostname" == '' ]
[ "$port" == '' ]
[ "$path" == 'comp.infosystems.www.servers.unix' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test tel:+1-816-555-1212" {
. parse_uri.sh
parse_uri 'tel:+1-816-555-1212'
[ "$scheme" == 'tel' ]
[ "$hostname" == '' ]
[ "$port" == '' ]
[ "$path" == '+1-816-555-1212' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test telnet://192.0.2.16:80/" {
. parse_uri.sh
parse_uri 'telnet://192.0.2.16:80/'
[ "$scheme" == 'telnet' ]
[ "$hostname" == '192.0.2.16' ]
[ "$port" == '80' ]
[ "$path" == '/' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}
@test "Test urn:oasis:names:specification:docbook:dtd:xml:4.1.2" {
. parse_uri.sh
parse_uri 'urn:oasis:names:specification:docbook:dtd:xml:4.1.2'
[ "$scheme" == 'urn' ]
[ "$hostname" == '' ]
[ "$port" == '' ]
[ "$path" == 'oasis:names:specification:docbook:dtd:xml:4.1.2' ]
[ "$username" == '' ]
[ "$password" == '' ]
[ "$query" == '' ]
[ "$fragment" == '' ]
}