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# Functions for manipulation of rsync URLs (both OUTPUT_URL and BACKUP_URL)
#### OLD STYLE:
# BACKUP_URL=[USER@]HOST:PATH # using ssh (no rsh)
#
# with rsync protocol PATH is a MODULE name defined in remote /etc/rsyncd.conf file
# BACKUP_URL=[USER@]HOST::PATH # using rsync
# BACKUP_URL=rsync://[USER@]HOST[:PORT]/PATH # using rsync (is not compatible with new style!!!)
#### NEW STYLE:
# BACKUP_URL=rsync://[USER@]HOST[:PORT]/PATH # using ssh
# BACKUP_URL=rsync://[USER@]HOST[:PORT]::/PATH # using rsync
function rsync_validate () {
local url="$1"
if [[ "$(url_scheme "$url")" != "rsync" ]]; then # url_scheme still recognizes old style
BugError "Non-rsync URL $url !"
fi
}
# Determine whether the URL specifies the use of the rsync protocol (rsyncd) or ssh
# Do not call on non-rsync URLs (use url_scheme first)
function rsync_proto () {
local url="$1"
rsync_validate "$url"
if grep -Eq '(::)' <<< $url ; then # new style '::' means rsync protocol
echo rsync
else
echo ssh
fi
}
# Functions to parse the URL into its components:
# USER, HOST, PORT, PATH
function rsync_user () {
local url="$1"
local host
host="$(url_host "$url")"
if grep -q '@' <<< $host ; then
echo "${host%%@*}" # grab user name
else
echo root
fi
}
function rsync_host () {
local url="$1"
local host
local path
host="$(url_host "$url")"
path="$(url_path "$url")"
# remove USER@ if present
local tmp2="${host#*@}"
case "$(rsync_proto "$url")" in
(rsync)
# tmp2=witsbebelnx02::backup or tmp2=witsbebelnx02::
echo "${tmp2%%::*}"
;;
(ssh)
# tmp2=host or tmp2=host:
echo "${tmp2%%:*}"
;;
esac
}
function rsync_path () {
local url="$1"
local host
local path
local url_without_scheme
local url_without_scheme_user
host="$(url_host "$url")"
path="$(url_path "$url")"
local tmp2="${host#*@}"
url_without_scheme="${url#*//}"
url_without_scheme_user="${url_without_scheme#$(rsync_user "$url")@}"
case "$(rsync_proto "$url")" in
(rsync)
if grep -q '::' <<< $url_without_scheme_user ; then
# we can not use url_path here, it uses / as separator, not ::
local url_after_separator="${url_without_scheme_user##*::}"
# remove leading / - this is a module name
echo "${url_after_separator#/}"
else
echo "${path#*/}"
fi
;;
(ssh)
if [ "$url_without_scheme" == "$url" ]; then
# no scheme - old-style URL
if grep -q ':' <<< $url_without_scheme_user ; then
echo "${url_without_scheme_user##*:}"
else
BugError "Old-style rsync URL $url without : !"
fi
else
echo "$path"
fi
;;
esac
}
function rsync_port () {
# XXX changing port not implemented yet
echo 873
}
# Full path to the destination directory on the remote server,
# includes RSYNC_PREFIX. RSYNC_PREFIX is not given by the URL,
# it is a global parameter (by default derived from hostname).
function rsync_path_full () {
local url="$1"
echo "$(rsync_path "$url")/${RSYNC_PREFIX}"
}
# Argument for the ssh command to log in to the remote host ("user@host")
function rsync_remote_ssh () {
local url="$1"
local user host
user="$(rsync_user "$url")"
host="$(rsync_host "$url")"
echo "${user}@${host}"
}
# Argument for the rsync command to reach the remote host, without path.
function rsync_remote_base () {
local url="$1"
local user host port
user="$(rsync_user "$url")"
host="$(rsync_host "$url")"
port="$(rsync_port "$url")"
case "$(rsync_proto "$url")" in
(rsync)
echo "rsync://${user}@${host}:${port}/"
;;
(ssh)
echo "$(rsync_remote_ssh "$url"):"
;;
esac
}
# Complete argument to rsync to reach the remote location identified by URL,
# but without the added RSYNC_PREFIX.
# This essentially converts our rsync:// URLs into a form accepted by the rsync command.
function rsync_remote () {
local url="$1"
echo "$(rsync_remote_base "$url")$(rsync_path "$url")"
}
# Complete argument to rsync including even RSYNC_PREFIX.
# Determined from the URL and RSYNC_PREFIX.
function rsync_remote_full () {
local url="$1"
echo "$(rsync_remote_base "$url")$(rsync_path_full "$url")"
}