#!/bin/bash
# libnetwork.lib -- @package@ library to get info from internet repositories
# Copyright (C) 2008,2010,2012,2014 Davide Madrisan <davide.madrisan@gmail.com>

[ "$libnetwork_is_loaded" = 1 ] || {
libnetwork_is_loaded=1

[ -z "$BASH" ] || [ ${BASH_VERSION:0:1} -lt 3 ] &&
 { echo $"this script requires bash version 3 or better" >&2 && exit 1; }

[ -r @libdir@/libmsgmng.lib ] ||
 { echo "\
libnetwork.lib: "$"library not found"": @libdir@/libmsgmng.lib" 1>&2
   exit 1; }
. @libdir@/libmsgmng.lib

[ -r @libdir@/libtranslate.lib ] ||
 { echo "\
libnetwork.lib: "$"library not found"": @libdir@/libtranslate.lib" 1>&2
   exit 1; }
. @libdir@/libtranslate.lib

notify.debug $"loading"": \`libnetwork.lib'..."

# check if all the needed tools are available
for tool in curl mktemp; do
   [ "$(type -p curl)" ] || notify.error $"utility not found"": \`curl'"
done

# function repository.get_srpm_pckname_from_site()
#    get the list of SRPM packages by looking at the curl dump of the
#    ftp or html site
# args:
#    --ftp | --html
#    $1 : package name or regexpr to look for
#    $2 : a (temporary) file containing the curl dump
# return value:
#    the list of srpm files
function repository.get_srpm_pckname_from_site() {
   local ARGS
   ARGS=`LC_ALL=C getopt \
      -o fh --long ftp,html \
      -n "$FUNCNAME" -- "$@"`
   [ $? = 0 ] || notify.error $"(bug)"" -- $FUNCNAME: "$"\`getopt' error"

   local is_html="0" is_ftp="0"

   eval set -- "$ARGS"
   while :; do
      case "$1" in
      -f|--ftp)
         is_ftp="1"
      ;;
      -h|--html)
         is_html="1"
      ;;
      --) shift; break ;;
      *) notify.error $"\
(bug)"" -- $FUNCNAME: "$"\`getopt' error: bad command \`$1'" ;;
      esac
      shift
   done

   [ "$is_ftp" != "$is_html" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"usage error (--ftp/--html)"

   local pck_name="$1"
   local infile="$2"

   [ "$pck_name" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#1)"
   [ "$infile" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#2)"

   notify.debug "$FUNCNAME: pck_name = \"$pck_name\""
   case "$pck_name" in */*) notify.error $"\
(bug)"" -- $FUNCNAME: "$"'\\' characters detected in \$pck_name" ;; esac

   notify.debug "$FUNCNAME: infile = \"$infile\""

   local regexpr
   [[ "$pck_name" =~ ^[+a-zA-Z0-9_-]+$ ]] && \
      regexpr="^$pck_name-[^-]\+-[^-]\+$" || regexpr="$pck_name"
   notify.debug "$FUNCNAME: regexpr = \"$regexpr\""

   if [ "$is_html" = "1" ]; then
      notify.debug "$FUNCNAME: parsing HTML dump..."
      local pckname_from_HTML=($(sed -n "\
# remove HTML tags --> get a better input
/<[aA]\+ [hH]\+[rR]\+[eE]\+[fF]\+=\".*\.src\.rpm\"/{
s|%2B|+|g;
s|.*<[aA]\+ [hH]\+[rR]\+[eE]\+[fF]\+=\"\([^\"]*\)\".*|\1|
{/$regexpr/Ip}}" $infile))
      echo "${pckname_from_HTML[*]}"
   elif [ "$is_ftp" = "1" ]; then
      notify.debug "$FUNCNAME: parsing FTP dump..."
      local pckname_from_FTP=($(sed -n "s,.*\ ,,;{/$regexpr/p}" $infile))
      echo "${pckname_from_FTP[*]}"
   fi
}

# function repository.resolveURL()
#    expand the given url according to the given arch
# args:
#    $1 : url to expand
#    $2 : current architecture
# return value:
#    the expanded url
function repository.resolveURL() {
   local ftpurl="$1" curr_arch="$2" resurl

   [ "$ftpurl" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#1)"
   [ "$curr_arch" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#2)"

   case "$ftpurl" in
   *@arch@*)
      echo -n "$(echo $ftpurl | sed "s,@arch@,$curr_arch,g")" ;;
   *) #echo -n "$ftpurl/$curr_arch/"
      echo -n "$ftpurl/" ;;
   esac
}

# function repository.get_SRPMS_name()
#    get the full name of the first SRPMS package found using as
#    package name '$@' and looking in the given list of repositories.
#    The full names are saved in the vector 'got_SPEC_FILENAME[]'.
#    The URL where the files have been found is saved in the variables
#    'got_SPEC_FILENAME_URL', and the index corresponding to this URL
#    is saved in 'got_SPEC_FILENAME_URL_LEVEL' (eventually set via the
#    '--urlnum' option)
# args:
#    -r,--urllist    : list of urls where to check for packages
#    -n,--urlnum     : the url number where to look at
#    -p,--proxy      : proxy server
#    -u,--proxy-user : proxy user
#    -l,--user       : login user (for repositories that require authentication)
#    $@              : list of package names to find for
# return value:
#    0 on success, 1 otherwise
function repository.get_SRPMS_name() {
   local ARGS
   ARGS=`LC_ALL=C getopt \
      -o n:r:p:u: \
      --long urlnum:,urllist:,proxy:,proxy-user:,user: \
      -n "$FUNCNAME" -- "$@"`
   [ $? = 0 ] || notify.error $"(bug)"" -- $FUNCNAME: "$"\`getopt' error"

   local i urlnum urllist proxy proxy_user user

   eval set -- "$ARGS"
   while :; do
      case "$1" in
      -n|--urlnum)
         urlnum="$2"; shift
         notify.debug "$FUNCNAME: urlnum = \"$urlnum\""
      ;;
      -r|--urllist)
         urllist=($2); shift
         for i in `seq 1 1 ${#urllist[*]}`; do
            notify.debug "$FUNCNAME: urllist[$(($i-1))] = ${urllist[$i-1]}"
         done
      ;;
      -p|--proxy)
         proxy="$2"; shift
         notify.debug "$FUNCNAME: proxy = \"$proxy\""
      ;;
      -u|--proxy-user)
         proxy_user="$2"; shift
         notify.debug "$FUNCNAME: proxy_user = \"$proxy_user\""
      ;;
      -l|--user)
         user="$2"; shift
         notify.debug "$FUNCNAME: user = \"$user\""
      ;;
      --) shift; break ;;
      *) notify.error $"\
(bug)"" -- $FUNCNAME: "$"\`getopt' error: bad command \`$1'" ;;
      esac
      shift
   done

   if [ "$urlnum" ]; then
      [[ "$urlnum" =~ ^[0-9]+$ ]] || notify.error $"\
(bug)"" -- $FUNCNAME: urlnum: "$"not a number"
   fi

   # this can be the result of a buggy configuration file
#   [ "$urllist" ] || notify.error $"\
#(bug)"" -- $FUNCNAME: urllist: "$"unset"

   local pck_names="$@"
   notify.debug "$FUNCNAME: pck_names = \"${pck_names[@]}\""
   [ "$pck_names" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#1)"

   # FIXME: 'curl_opts_netlink' is an external variable
   local curlopts="\
-L --silent --list-only $curl_opts_netlink\
${user:+ --user $user}\
${proxy:+ --proxy $proxy}${proxy_user:+ --proxy-user $proxy_user}"

   local curlopts_debug="\
-L --silent --list-only $curl_opts_netlink\
${user:+ --user ***}\
${proxy:+ --proxy ***}${proxy_user:+ --proxy-user ***}"

   local flist currflist currurl
   local errors=0
   let "i = 0"
   for currurl in ${urllist[*]}; do
      # get the list of files from the repository
      notify.note $"\
getting list of files from"" \`${NOTE}$currurl/${NORM}'..."

      case $currurl in
         ftp://*|http://*|https://*) ;;
         *) notify.warning $"unsupported query type for this protocol"
            let "errors += 1"
            continue ;;
      esac

      currflist="$(mktemp -q -t flist.XXXXXXXX)" ||
         notify.error $"can't create temporary files"
      notify.debug "$FUNCNAME: currflist = $currflist"

      # NOTE: the trailing slash is necessary, do not remove it
      notify.debug "$FUNCNAME: curl $curlopts_debug --url $currurl/ -o $currflist"
      curl $curlopts --url $currurl/ -o $currflist
      let "retval = $?"
      notify.debug "$FUNCNAME: curl return code: $retval"

      case "$retval" in
        0) sed -i 's/\x0D$//;s/%2B/+/g' $currflist
           flist[$i]="$currflist" ;;
        6) notify.warning $"couldn't resolve host"
           let "errors += 1" ;;
        7) notify.warning $"failed to connect to host"
           let "errors += 1" ;;
       56) notify.warning $"failure in receiving network data"
           let "errors += 1" ;;
        *) notify.warning $"curl error (exit code: $retval)"
           let "errors += 1" ;;
      esac

      [ -s "$currflist" ] || notify.warning $"cannot get the list of files"

      let "i += 1"
   done
   [ "$errors" = "${#urllist[@]}" ] && return 1

   local pck_name level
   for pck_name in ${pck_names[@]}; do
      let "level = ${urlnum:-0}"
      let "i = 0"
      for currurl in ${urllist[*]}; do
         notify.debug "$FUNCNAME: pck_name = $pck_name"

         if [ -s "${flist[$i]}" ]; then
            case $currurl in
               ftp://*)
                  got_SPEC_FILENAME=($(\
repository.get_srpm_pckname_from_site --ftp "$pck_name" "${flist[$i]}"))
               ;;
               http://*|https://*)
                  got_SPEC_FILENAME=($(\
repository.get_srpm_pckname_from_site --html "$pck_name" "${flist[$i]}"))
               ;;
            esac

            [ "$got_SPEC_FILENAME" ] &&
             { notify.debug "\
$FUNCNAME: got_SPEC_FILENAME = ${got_SPEC_FILENAME[*]}"
               got_SPEC_FILENAME_URL_LEVEL="$level"
               got_SPEC_FILENAME_URL="$currurl"
               break 2; }
         fi
         let "level += 1"
         let "i += 1"
      done
   done

   for i in ${!flist[@]}; do
      notify.debug "$FUNCNAME: removing temporary file '${flist[$i]}'"
      rm -f ${flist[$i]}
   done

   return 0
}

# function repository.get_RPMS_name()
#    get the full name of the RPMS package '$1' looking at the
#    repository '$1'.
#    The full names are saved in the vector 'got_RPM_FILENAME[]'.
# args:
#    $1              : URL where to check
#    $2 .. $n        : package names to look at
#    -a,--archlist   : list of supported architectures in the specified url
#    -x,--exclude    : exclude packages that match a given regexpr
#    -c,--target-cpu : set the build architecture
#    -p,--proxy      : proxy server
#    -u,--proxy-user : proxy user
#    -l,--user       : login user (for repositories that require authentication)
# return value:
#    0 on success, >0 otherwise
# example of output:
#    got_RPM_FILENAME = (
#      i586:mbrowse-0.3.1-1qilnx.i586.rpm
#      i586:mbrowse-contrib-0.3.1-1qilnx.noarch.rpm
#      ppc:mbrowse-contrib-0.3.1-1qilnx.noarch.rpm )
function repository.get_RPMS_name() {
   ARGS=`LC_ALL=C getopt \
      -o a:x:c:p:u: \
      --long archlist:,exclude:,target-cpu:,proxy:,proxy-user:,user: \
      -n "$FUNCNAME" -- "$@"`
   [ $? = 0 ] || notify.error $"(bug)"" -- $FUNCNAME: "$"\`getopt' error"

   eval set -- "$ARGS"

   local archlist excludeopt proxy proxy_user user target_cpu
   while :; do
      case $1 in
      -a|--archlist)
         archlist="$2"; shift
         notify.debug "$FUNCNAME: archlist = \"$archlist\""
      ;;
      -x|--exclude)
         excludeopt="$2"; shift
         notify.debug "$FUNCNAME: excludeopt = \"$excludeopt\""
      ;;
      -c|--target-cpu)
         target_cpu="$2"; shift
         notify.debug "$FUNCNAME: target_cpu = \"$target_cpu\""
      ;;
      -p|--proxy)
         proxy="$2"; shift
         notify.debug "$FUNCNAME: proxy = \"$proxy\""
      ;;
      -u|--proxy-user)
         proxy_user="$2"; shift
         notify.debug "$FUNCNAME: proxy_user = \"$proxy_user\""
      ;;
      -l|--user)
         user="$2"; shift
         notify.debug "$FUNCNAME: user = \"$user\""
      ;;
      --) shift; break ;;
      *) notify.error $"\
(bug)"" -- $FUNCNAME: "$"\`getopt' error" ;;
      esac
      shift
   done

   local scanurl="$1"
   [ "$scanurl" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#1)"
   shift

   local pck_names="$@"
   notify.debug "$FUNCNAME: pck_names = \"${pck_names[@]}\""
   [ "$pck_names" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#2)"

   [ "$archlist" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"no list of architectures set"" (\$archlist)"

   local flist=`mktemp -q -t flist.XXXXXXXX` ||
      notify.error $"can't create temporary files"

   local curr_arch errors pck_name curr_match
   let "errors = 0"

   local curr_arch_list
   case "$target_cpu" in
      "") curr_arch_list=( $archlist ) ;;
      "noarch")
         #curr_arch_list=( ${arch_noarch_upload[*]} )
         # FIXME : if the noarch directory cannot be found a warning
         # message is displayed
         curr_arch_list=( $archlist noarch )
      ;;
      *) # if the architecture is set by the user do ignore packages
         # built for other architectures (aka: please do not remove
         # packages built for other architectures!)
         curr_arch_list="$target_cpu"
      ;;
   esac
   notify.debug "\
$FUNCNAME: curr_arch_list = ( ${curr_arch_list[*]} )"

   # FIXME: 'curl_opts_netlink' is an external variable
   local curlopts="\
-L --silent --list-only $curl_opts_netlink -o $flist\
${user:+ --user $user}\
${proxy:+ --proxy $proxy}${proxy_user:+ --proxy-user $proxy_user}"

   local curlopts_debug="\
-L --silent --list-only $curl_opts_netlink -o $flist\
${user:+ --user ***}\
${proxy:+ --proxy ***}${proxy_user:+ --proxy-user ***}"

   got_RPM_FILENAME=
   for curr_arch in ${curr_arch_list[*]}; do
      currurl="$(repository.resolveURL "$scanurl" "$curr_arch")"
      #[ "$currurl" ] || notify.error $"(bug)"" -- $FUNCNAME: currurl = \"\""

      # get the list of files from the repository
      notify.note $"getting list of files from"" \`${NOTE}$currurl/${NORM}'..."

      > $flist

      # NOTE: the trailing slash is necessary, do not remote it
      notify.debug "$FUNCNAME: curl $curlopts_debug --url $currurl/"
      curl $curlopts --url $currurl/
      let "retval = $?"
      notify.debug "$FUNCNAME: curl return code: $retval"
      case "$retval" in
        0) ;;
        6) notify.warning $"couldn't resolve host" ;;
        7) notify.warning $"failed to connect to host" ;;
       56) notify.warning $"failure in receiving network data" ;;
        *) notify.warning $"curl error (exit code: $retval)" ;;
      esac

      if [ -s "$flist" ]; then
         sed -i 's/\x0D$//;s/%2B/+/g' $flist
         case $currurl in
         ftp://*|http://*|https://*)
            for pck_name in ${pck_names[@]}; do
               got_RPM_FILENAME=( ${got_RPM_FILENAME[@]} $(\
                  if [ -n "$excludeopt" ]; then
                     sed -n "\
                        /<a href=\"/{s|.*<a href=\"\([^\"]*\)\".*|\1|;bm;};
                        /<A HREF=\"/{s|.*<A HREF=\"\([^\"]*\)\".*|\1|;bm;};
                        /^$pck_name-[^-]*-[^-]*\.rpm/bm;be;
                        :m;/^$pck_name-[^-]*-[^-]*\.rpm/{s,.*,$curr_arch:&,p}
                        :e" $flist | grep -v -- "$excludeopt"
                  else
                     sed -n "\
                        /<a href=\"/{s|.*<a href=\"\([^\"]*\)\".*|\1|;bm;};
                        /<A HREF=\"/{s|.*<A HREF=\"\([^\"]*\)\".*|\1|;bm;};
                        /^$pck_name-[^-]*-[^-]*\.rpm/bm;be;
                        :m;/^$pck_name-[^-]*-[^-]*\.rpm/{s,.*,$curr_arch:&,p}
                        :e" $flist
                  fi ))
         done
         ;;
         *) notify.warning $"unsupported query type for this protocol" ;;
         esac
      else
         notify.warning $"cannot get the list of files"" ($curr_arch)"
         let "errors += 1"
      fi
   done

   rm -f $flist

   notify.debug "$FUNCNAME: got_RPM_FILENAME = ( ""$(
      for pck_name in ${got_RPM_FILENAME[@]}; do
         echo -en "\n   $pck_name"
      done ) )"

   return $errors
}

# function curl.download
#    download a file from an internet address using curl
#    
# args:
#    -d,--destdir     : target directory
#    -f,--force       : force download (optional, default: false)
#    -n,--filenum     : number to display when executing this functions several times
#    -o,--options     : extra options to pass to curl
#    -x,--exit-on-err : terminate the script if the download fails
#    -p,--proxy       : proxy
#    -u,--proxy-user  : proxy user
#    --debug-unsecure : print private informations in debug mode
#    $@               : list of files to be downloaded
# return value:
#    0 on success, 1 otherwise

function curl.download() {
   local ARGS
   ARGS=`LC_ALL=C getopt \
      -o d:fn:o:xp:u: \
      --long destdir:,force,filenum:,options:,exit-on-err,proxy:,proxy-user: \
      -n "$FUNCNAME" -- "$@"`
   [ $? = 0 ] || notify.error $"(bug)"" -- $FUNCNAME: "$"\`getopt' error"

   local destdir
   local curl_opts
   local exitonerror="0"
   local force_download="0"
   local proxy proxy_user
   local filenum="1"
   local is_a_localfile

   eval set -- "$ARGS"
   while :; do
      case "$1" in
      -d|--destdir)
         destdir="$2"; shift
         notify.debug "$FUNCNAME: destdir = \"$destdir\""
      ;;
      -f|--force)
         force_download=1
         notify.debug "$FUNCNAME: force download is enabled"
      ;;
      -n|--filenum)
         filenum="$2"; shift
         notify.debug "$FUNCNAME: filenum = \"$filenum\""
      ;;
      -o|--options)
         curl_opts="$2"; shift
         notify.debug "$FUNCNAME: curl_opts = \"$curl_opts\""
      ;;
      -x|--exit-on-err)
         exitonerror="1"
         notify.debug "$FUNCNAME: exitonerror = \"$exitonerror\""
      ;;
      -p|--proxy)
         proxy="$2"; shift
         notify.debug "$FUNCNAME: proxy = \"$proxy\""
      ;;
      -u|--proxy-user)
         proxy_user="$2"; shift
         notify.debug "$FUNCNAME: proxy_user = \"$proxy_user\""
      ;;
      --) shift; break;;
      *) notify.error $"\
(bug)"" -- $FUNCNAME: "$"\`getopt' error: bad command \`$1'" ;;
      esac
      shift
   done

   # FIXME: add support for list of files
   local file_url="$1"
   notify.debug "$FUNCNAME: file_url = \"$file_url\""
   [ "$file_url" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#1)"

   [ "$destdir" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (--destdir)"

   local file_name
   case "$file_url" in
      http://*|https://*|ftp://*)
         file_name="${file_url##*/}"
         is_a_localfile="0" ;;
      *://*)
         notify.error $"unsupported protocol"": \`${file_url//\:*}'"
      ;;
      *) #notify.error $"not an internet address"": \`$file_url'"
         # it's a local file
         [ -e "$destdir/$file_url" ] ||
            notify.error $"file not found"": \`$destdir/$file_url'"
         notify.note "[${filenum:-*}]  $NOTE$file_url$NORM ... "$"skipped"
         return 0
         ;;
   esac

   if [ -e $destdir/$file_name ]; then
      if [ "$force_download" = "0" ]; then
         notify.note "[${filenum:-*}]  $NOTE$file_url$NORM ... "$"skipped"
         return 0
      else
         rm -f $destdir/$file_name
      fi
   fi

   notify.note $"downloading"" ${NOTE}$file_name${NORM} ..."

   [ -d "$destdir" ] ||
      if [ "$exitonerror" = 1 ]; then
         notify.warning $"\
(bug)"" -- $FUNCNAME: "$"no such directory"": \`$destdir'"
         return 1
      else
         notify.error $"\
(bug)"" -- $FUNCNAME: "$"no such directory"": \`$destdir'"
      fi

   notify.note "\
[${filenum:-*}]  $NOTE$file_url$NORM
       --> $destdir/$file_name"

   pushd $destdir >/dev/null

   local retval
   notify.debug "curl $curl_opts\
${proxy:+ --proxy $proxy}${proxyuser:+ --proxy-user $proxy_user} $file_url"

   curl $curl_opts \
      ${proxy:+ --proxy $proxy} ${proxyuser:+ --proxy-user $proxy_user} \
      "$file_url"
   retval=$?

   notify.debug "$FUNCNAME: curl return code: $retval"
   case "$retval" in
     0) ;;
     6) notify.warning $"couldn't resolve host" ;;
     7) notify.warning $"failed to connect to host" ;;
    56) notify.warning $"failure in receiving network data" ;;
     *) notify.warning $"curl error (exit code: $retval)" ;;
   esac

   [ -e $destdir/$file_name ] ||
   if [ "$exitonerror" = 1 ]; then
      notify.error $"cannot download"": \`$file_name'"
   else
      popd >/dev/null
      notify.warning $"cannot download"": \`$file_name'"
      return 1
   fi

   popd >/dev/null
}

# function curl.upload
#    upload a file using curl
#    
function curl.upload() {
   local ARGS
   ARGS=`LC_ALL=C getopt \
      -o f:l:o:p:u:x \
      --long upload-file:,user:,options:,proxy:,proxy-user:,\
repository-alias:,exit-on-err,debug-unsecure \
      -n "$FUNCNAME" -- "$@"`
   [ $? = 0 ] || notify.error $"(bug)"" -- $FUNCNAME: "$"\`getopt' error"

   local upfile user options proxy proxy_user
   local exitonerror=0
   local debug_unsecure=0

   eval set -- "$ARGS"
   while :; do
      case "$1" in
      -f|--upload-file)
         upfile="$2"; shift
      ;;
      -l|--user)
         user="$2"; shift
         #notify.debug "$FUNCNAME: user = \"$user\""
      ;;
      -o|--options)
         options="$2"; shift
         #notify.debug "$FUNCNAME: options = \"$options\""
      ;;
      -p|--proxy)
         proxy="$2"; shift
         #notify.debug "$FUNCNAME: proxy = \"$proxy\""
      ;;
      -u|--proxy-user)
         proxy_user="$2"; shift
         #notify.debug "$FUNCNAME: proxy_user = \"$proxy_user\""
      ;;
      -x|--exit-on-err)
         exitonerror="1"
         #notify.debug "$FUNCNAME: exitonerror = \"$exitonerror\""
      ;;
      --debug-unsecure)
         debug_unsecure="1"
      ;;
      --) shift; break;;
      *) notify.error $"\
(bug)"" -- $FUNCNAME: "$"\`getopt' error: bad command \`$1'" ;;
      esac
      shift
   done

   #notify.debug "$FUNCNAME: debug_unsecure = \"$debug_unsecure\""

   local destfile="$1"
   [ "$destfile" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#1)"

   [ -e "$upfile" ] || notify.error $"package not found"": \`$upfile'"

   # FIXED: add an extra newline to workaroung a bug in curl
   notify.note "\
 * ${NOTE}$upfile${NORM}
   --> $destfile"

   # option: --write-out [%{url_effective}]\\n
   # the option '--progress-bar' is currently buggy in curl
   local curr_curl_cmd="$options --progress-bar --fail -o /dev/null \
${proxy:+ --proxy $proxy}${proxyuser:+ --proxy-user $proxy_user} \
--upload-file $upfile $destfile"

   if [ "$debug_unsecure" = "1" ]; then
      notify.debug "curl --user $user $curr_curl_cmd"
   else
      notify.debug "curl --user ***:*** $curr_curl_cmd"
   fi

   curl --user $user $curr_curl_cmd
   [ $? -eq 0 ] || { [ "$exitonerror" = 1 ] && exit 1 || return 1; }
}

# function curl.ftp_command
#    execute an ftp command (creating a directory, renamig a file,
#    deleting) using curl
#
function curl.ftp_command() {
   local ARGS
   ARGS=`LC_ALL=C getopt \
      -o l:o:p:u:a: \
      --long user:,options:,proxy:,proxy-user:,debug-unsecure,\
action:,directory:,rename-from:,rename-to:,delete:,ftp-passive \
      -n "$FUNCNAME" -- "$@"`
   [ $? = 0 ] || notify.error $"(bug)"" -- $FUNCNAME: "$"\`getopt' error"

   local user options proxy proxy_user ftp_passive
   local action directory fromfile tofile deletefile
   local exitonerror=0

   eval set -- "$ARGS"
   while :; do
      case "$1" in
      -l|--user)
         user="$2"; shift
         #notify.debug "$FUNCNAME: user = \"$user\""
      ;;
      -o|--options)
         options="$2"; shift
         #notify.debug "$FUNCNAME: options = \"$options\""
      ;;
      -p|--proxy)
         proxy="$2"; shift
         #notify.debug "$FUNCNAME: proxy = \"$proxy\""
      ;;
      -u|--proxy-user)
         proxy_user="$2"; shift
         #notify.debug "$FUNCNAME: proxy_user = \"$proxy_user\""
      ;;
      --debug-unsecure)
         debug_unsecure="1"
      ;;
      -a|--action)
         action="$2"; shift
      ;;
      --directory)
         directory="$2"; shift
      ;;
      --rename-from)
         fromfile="$2"; shift
      ;;
      --rename-to)
         tofile="$2"; shift
      ;;
      --delete)
         deletefile="$2"; shift
      ;;
      --ftp-passive)
         ftp_passive="--ftp-pasv"
      ;;
      -x|--exit-on-err)
         exitonerror="1"
      ;;
      --) shift; break;;
      *) notify.error $"\
(bug)"" -- $FUNCNAME: "$"\`getopt' error: bad command \`$1'" ;;
      esac
      shift
   done

   local backup_ftp_server="$1"
   [ "$backup_ftp_server" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#1)"

   [ "$ftp_passive" ] && options="$options $ftp_passive"

   [ "${1:0:4}" == "http" ] && http_mode=1

   # NOTE: see RFC959 for the sintax of the 'quote' commands
   # curl --ftp-pasv --user user:password \
   #    -Q "MKD /devel/old/prova.dir" \
   #    -Q "RNFR /devel/old/prova.tmp" \
   #    -Q "RNTO /devel/old/prova.dir/prova.tmp" ftp.linuxdistro.org
   case "$action" in
   mkdir)
      [ "$directory" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (--directory)"

      if [ "$http_mode" == "1" ]; then
         notify.debug "\
curl $options --user \"***:***\" -X MKCOL $1${directory}/"
         curl $options --user "$user" -X MKCOL $1${directory}/ &>/dev/null
      else
         notify.debug "\
curl $options --user \"***:***\" --quote \"MKD $directory\" $1"
         curl $options --user "$user" --quote "MKD $directory" $1 &>/dev/null
      fi
   ;;
   rename-file)
      [ "$fromfile" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (--rename-from)"
      [ "$tofile" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (--rename-to)"

      if [ "$http_mode" == "1" ]; then
         notify.debug "curl $options --user \"***:***\" -X MOVE\
 --header \"Destination:$1$tofile\" $1$fromfile"
         curl $options --user "$user" -X MOVE \
            --header "Destination:$1$tofile" $1$fromfile &>/dev/null
      else
         notify.debug "curl $options --user \"***:***\"\
 --quote \"RNFR $fromfile\" --quote \"RNTO $tofile\" $1"
         curl $options --user "$user" \
            --quote "RNFR $fromfile" --quote "RNTO $tofile" $1 &>/dev/null
      fi
   ;;
   delete)
      [ "$deletefile" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (--delete)"

      # example:
      #   curl -v --ftp-pasv --user "$user" \
      #      --quote "CWD SRPMS.base" \
      #      --quote "DELE filename-0.0.1-1distro.src.rpm" \
      #      ftp://ftpaccounts.openmamba.org
      # -or-
      #   curl -v --ftp-pasv --user "$user" \
      #      --quote "DELE SRPMS.base/filename-0.0.1-1distro.src.rpm" \
      #      ftp://ftpaccounts.openmamba.org
      if [ "$http_mode" == "1" ]; then
         notify.debug "\
curl $options --user \"***:***\" -X DELETE $1$deletefile"
         curl $options --user "$user" -X DELETE $1$deletefile &>/dev/null
      else
         notify.debug "\
curl $options --user \"***:***\" --quote \"DELE $deletefile\" $1"
         curl $options --user "$user" --quote "DELE $deletefile" $1 &>/dev/null
      fi
   ;;
   *) notify.error $"\
(bug)"" -- $FUNCNAME: "$"unknown action"": ($action)"
   esac
   retval=$?

   case "$retval" in
      0) ;;
      6) notify.warning $"couldn't resolve host" ;;
      7) notify.warning $"failed to connect to host" ;;
      *) notify.warning $"curl error (exit code: $retval)" ;;
   esac

   [[ "$retval" != "0" && "$exitonerror" = 1 ]] && exit 1
}

# function git.download
#    helper for creating a tarball from a git repository
# args:
#    -d, --destdir    : target directory
#    -p, --proxy      : proxy server
#    -u, --proxy-user : proxy user
#    --preserve-dot-git : do not remove .git files
#    $@               : git repository
#
# return value:
#    0

function git.download() {
   local ARGS
   ARGS=`LC_ALL=C getopt \
      -o d:v:p:u:k \
      --long destdir:,pck-version:,proxy:,proxy-user:,preserve-dot-git: \
      -n "$FUNCNAME" -- "$@"`
   [ $? = 0 ] || notify.error $"(bug)"" -- $FUNCNAME: "$"\`getopt' error"

   local destdir
   local proxy proxy_user
   local pck_version
   local preserve_dot_git=0

   eval set -- "$ARGS"
   while :; do
      case "$1" in
      -d|--destdir)
         destdir="$2"; shift
         notify.debug "$FUNCNAME: destdir = \"$destdir\""
      ;;
      -v|--pck-version)
         pck_version="$2"; shift
         notify.debug "$FUNCNAME: pck_version = \"$pck_version\""
      ;;
      -p|--proxy)
         proxy="$2"; shift
         notify.debug "$FUNCNAME: proxy = \"$proxy\""
      ;;
      -u|--proxy-user)
         proxy_user="$2"; shift
         notify.debug "$FUNCNAME: proxy_user = \"$proxy_user\""
      ;;
      --preserve-dot-git)
         preserve_dot_git="$2"; shift
         notify.debug "$FUNCNAME: preserve_dot_git = \"$preserve_dot_git\""
      ;;
      --) shift; break;;
      *) notify.error $"\
(bug)"" -- $FUNCNAME: "$"\`getopt' error: bad command \`$1'" ;;
      esac
      shift
   done

   local giturl_and_branch="$1"

   notify.debug "$FUNCNAME: giturl_and_branch = \"$giturl_and_branch\""
   [ "$giturl_and_branch" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#1)"

   [ "$destdir" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (--destdir)"

   local token_dirname="${giturl_and_branch%/*}"
   local token_basename="${giturl_and_branch##*/}"
   notify.debug "$FUNCNAME: token_dirname = \"$token_dirname\""   
   notify.debug "$FUNCNAME: token_basename = \"$token_basename\""

   if [ -e $destdir/$token_basename ]; then
      if [ "$force_download" = "0" ]; then
         notify.note "[${filenum:-*}]  $NOTE$token_basename$NORM ... "$"skipped"
         return 0
      fi
   fi

   local git_branch="${token_dirname/*\/}"
   notify.debug "$FUNCNAME: git_branch = \"$git_branch\""

   git.create_tarball \
      --pck-version "$pck_version" \
      --destdir "$destdir" \
      --preserve-dot-git "${preserve_dot_git}" --git-branch "$git_branch" \
      "${token_dirname/\/$git_branch*}"
}

# function git.urldecode
#    url decodes a given string
function git.urldecode() { : "${*//+/ }"; echo -e "${_//%/\\x}"; }

# function git.create_tarball
#    clone a git repository and convert is into a tarball file
#
# args:
#    -d,--destdir       : target directory
#    -v,--pck-version   : package version
#    --git-branch       : git branch
#    --preserve-dot-git : do not remove .git files
#    $@                 : git repository
#
# return value:
#    0
#
# set: spec_source, spec_source_comment, pck_tarball

function git.create_tarball() {
   local ARGS
   ARGS=`LC_ALL=C getopt -o d:v:p:u: \
--long destdir:,pck-version:,git-branch:,preserve-dot-git:,proxy:,proxy-user:\
      -n "$FUNCNAME" -- "$@"`
   [ $? = 0 ] || notify.error $"(bug)"" -- $FUNCNAME: "$"\`getopt' error"

   local destdir
   # FIXME: add support for proxy
   # HINT: git config --global http.proxy http://user:pwd@proxy.srv.com:port
   # see: http://bardofschool.blogspot.fr/2008/11/use-git-behind-proxy.html
   local proxy proxy_user
   local git_branch
   local git_commit
   local preserve_dot_git=0
   local pck_version

   eval set -- "$ARGS"
   while :; do
      case "$1" in
      -d|--destdir)
         destdir="$2"; shift
         notify.debug "$FUNCNAME: destdir = \"$destdir\""
      ;;
      -v|--pck-version)
         pck_version="$2"; shift
         notify.debug "$FUNCNAME: pck_version = \"$pck_version\""
      ;;
      --git-branch)
         git_branch="`git.urldecode "$2"`"; shift
         if [ "${git_branch/@*}" != "${git_branch}" ]; then
            git_commit="${git_branch/*@}"
            git_branch="${git_branch/@*}"
            if [ ! "${git_commit}" ]; then
               notify.error "$FUNCNAME: cannot checkout empty commit"
            fi
         fi
         notify.debug "$FUNCNAME: git_branch = \"$git_branch\""
         if [ "${git_commit}" ]; then
            notify.debug "$FUNCNAME: git_commit = \"$git_commit\""
         fi
      ;;
      --preserve-dot-git)
         preserve_dot_git="$2"; shift
         notify.debug "$FUNCNAME: preserve_dot_git = \"$preserve_dot_git\""
      ;;
      -p|--proxy)
         proxy="$2"; shift
         notify.debug "$FUNCNAME: proxy = \"$proxy\""
      ;;
      -u|--proxy-user)
         proxy_user="$2"; shift
         notify.debug "$FUNCNAME: proxy_user = \"$proxy_user\""
      ;;
      --) shift; break;;
      *) notify.error $"\
(bug)"" -- $FUNCNAME: "$"\`getopt' error: bad command \`$1'" ;;
      esac
      shift
   done

   local git_repository="$1"
   notify.debug "$FUNCNAME: git_repository = \"$git_repository\""
   [ "$git_repository" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (#1)"

   [ "$destdir" ] || notify.error $"\
(bug)"" -- $FUNCNAME: "$"missing mandatory arg"" (--destdir)"

   type -p git &>/dev/null ||
      notify.error $"utility not found"": \`git'"

   local tmpgitdir=$(mktemp -q -d -t tmpgit.XXXXXXXX)
   [ $? -eq 0 ] ||
      notify.error $"can't create temporary files"
   notify.debug "$FUNCNAME: tmpgitdir = $tmpgitdir"

   pushd $tmpgitdir &>/dev/null

   # create a tarball by cloning the git repository
   notify.note \
      "${NOTE}"$"cloning git repository""\
 <$git_repository> ${git_branch:+($git_branch)}${NORM}""..."
   if [ "$preserve_dot_git" = "0" -a "${git_repository:0:4}" != "http" -a ! "${git_commit}" ]; then
      notify.debug "$FUNCNAME: git clone --recursive --depth=1 ${git_branch:+-b $git_branch} \"$git_repository\""
      git clone --recursive --depth=1 ${git_branch:+-b $git_branch} "$git_repository"
   else
      notify.debug "$FUNCNAME: git clone --recursive ${git_branch:+-b $git_branch} \"$git_repository\""
      git clone --recursive ${git_branch:+-b $git_branch} "$git_repository"
   fi
   [ $? -eq 0 ] ||
    { popd &>/dev/null
      rm -fr $tmpgitdir
      notify.error $"cannot clone git repository"; }

   pck_tarball="$(find -mindepth 1 -maxdepth 1 -type d -printf "%f")"

   if [ "${git_commit}" ]; then
      cd ${pck_tarball}
      git checkout ${git_commit} || {
         popd &>/dev/null
         rm -fr $tmpgitdir
         notify.error $"cannot checkout the specified tag";
      }
      cd ..
   fi

   if [ "$preserve_dot_git" = "0" ]; then
      # remove git files
      rm -fr $pck_tarball/.git
      rm -f $pck_tarball/.gitignore
      rm -f $pck_tarball/.gitmodules
   fi

   mv $pck_tarball ${pck_tarball}-${pck_version}
   pck_tarball="${pck_tarball}-${pck_version}"

   # create a compressed tarball
   # FIXME: why bzip2? The compression tool used here should be configurable
   notify.note "${NOTE}"$"creating the compressed source tarball""${NORM}..."
   tar -cvf ${pck_tarball}.tar $pck_tarball/ >/dev/null &&
   bzip2 ${pck_tarball}.tar &&
   mv ${pck_tarball}.tar.bz2 $destdir/
   if [ $? -eq 0 ]; then
      notify.note "\
...${NOTE}"$"done""${NORM}: \`${NOTE}${pck_tarball}.tar.bz2${NORM}'"
   else
      popd &>/dev/null
      rm -fr $tmpgitdir
      notify.error $"\
an error occurred while creating"": ${pck_tarball}.tar.bz2"
   fi

   spec_source="${pck_tarball}.tar.bz2"
   notify.debug "$FUNCNAME: spec_source = $spec_source"
   spec_source_comment="\
## GITSOURCE $git_repository${git_branch:+ $git_branch}"
   notify.debug "$FUNCNAME: spec_source_comment = \"$spec_source_comment\""
   pck_tarball="$destdir/${spec_source}"
   notify.debug "$FUNCNAME: pck_tarball = $pck_tarball"

   popd &>/dev/null
   rm -fr $tmpgitdir

   return 0
}

} # endif $libnetwork_is_loaded