Adds bittorrent support for live images

This patch adds bittorrent support to 45url-lib for those that might want
to retrieve the same live image for multiple systems at once without
saturating the network.

This patch requires ctorrent to be installed into initramfs.

Torrent kernel command line format:
root=live:torrent://example.com/liveboot.img.torrent

Start a tracker:
bttrack --bind <tracker_ip> --port 6969 --dfile dstate --reannounce_interval 60

Create the torrent:
ctorrent -t live_image -u http://<tracker_ip>:6969/announce -s live_image.torrent

Seed the initial torrent:
ctorrent live_image.torrent

Boot the live image.

diff --git a/dracut.cmdline.7.asc b/dracut.cmdline.7.asc
index 545bab429962e51097d166166a8ab59de6f19625..2c7fd91f7f4c2974c8eadf20f8dbe40fa18f8900 100644 (file)
--- a/dracut.cmdline.7.asc
+++ b/dracut.cmdline.7.asc
@@ -790,13 +790,14 @@ of your compressed filesystem image tarball.
 =====================
 
 **root=**live:__<url>__::
-Boots a live image retrieved from __<url>__.  Valid handlers: __http, httpd, ftp, tftp__.
+Boots a live image retrieved from __<url>__.  Valid handlers: __http, https, ftp, torrent, tftp__.
 +
 [listing]
 .Example
 --
 root=live:http://example.com/liveboot.img
 root=live:ftp://ftp.example.com/liveboot.img
+root=live:torrent://example.com/liveboot.img.torrent
 --
 
 **rd.live.debug=**1::

diff --git a/modules.d/45url-lib/module-setup.sh b/modules.d/45url-lib/module-setup.sh
index 1b785c242a8eb6649c139f6e8a30c27bae5b029f..c87f71862f32e8ff8412a4b550f5f7b7c3245231 100755 (executable)
--- a/modules.d/45url-lib/module-setup.sh
+++ b/modules.d/45url-lib/module-setup.sh
@@ -17,6 +17,7 @@ depends() {
 install() {
     local _dir _crt _found _lib
     inst_simple "$moddir/url-lib.sh" "/lib/url-lib.sh"
+    inst_multiple -o ctorrent
     inst_multiple curl
     # also install libs for curl https
     inst_libdir_file "libnsspem.so*"

diff --git a/modules.d/45url-lib/url-lib.sh b/modules.d/45url-lib/url-lib.sh
index c9d143a28fce01a8c730ef0ee9c500ded8793566..d9cebd4dd010e346211f368016aa569e955f4f09 100755 (executable)
--- a/modules.d/45url-lib/url-lib.sh
+++ b/modules.d/45url-lib/url-lib.sh
@@ -82,6 +82,36 @@ set_http_header() {
     echo "header = \"$1: $2\"" >> $CURL_HOME/.curlrc
 }
 
+### TORRENT ##########################################################
+
+ctorrent_args="-E 0 -e 0"
+
+ctorrent_fetch_url() {
+    local url="$1" outloc="$2"
+    url=${url#*//}
+    torrent_outloc="$outloc.torrent"
+    echo "$url" > /proc/self/fd/0
+    if [ -n "$outloc" ]; then
+        curl $curl_args --output - -- "$url" > "$torrent_outloc" || return $?
+    else
+        local outdir="$(mkuniqdir /tmp torrent_fetch_url)"
+        ( cd "$outdir"; curl $curl_args --remote-name "$url" || return $? )
+        torrent_outloc="$outdir/$(ls -A $outdir)"
+        outloc=${torrent_outloc%.*}
+    fi
+    if ! [ -f "$torrent_outloc" ]; then
+        warn "Downloading '$url' failed!"
+        return 253
+    fi
+    ctorrent $ctorrent_args -s $outloc $torrent_outloc >&2
+    if ! [ -f "$outloc" ]; then
+        warn "Torrent download of '$url' failed!"
+        return 253
+    fi
+    if [ -z "$2" ]; then echo "$outloc" ; fi
+}
+add_url_handler ctorrent_fetch_url torrent
+
 ### NFS ##############################################################
 
 [ -e /lib/nfs-lib.sh ] && . /lib/nfs-lib.sh