infra/dgit-mirror-rsync

   1 #!/bin/bash
   2 #
   3 # Mirror script for use as a dgit-repos-server mirror hook
   4 #
   5 # In addition to updated-hook (invoked by dgit-repos-server),
   6 # this script also supports the following ACTIONs:
   7 #   MIRROR-HOOK-SCRIPT ... setup [...]            create queue dir etc.
   8 #   MIRROR-HOOK-SCRIPT ... backlog [...]          do all packages which need it
   9 #   MIRROR-HOOK-SCRIPT ... all [...]              do all packages
  10 #   MIRROR-HOOK-SCRIPT ... mirror PACKAGE [...]   do just that, longer timeout
  11 #
  12 # DISTRO-DIR must contain a file `mirror-settings' which is a bash
  13 # script fragment assigning the following variables:
  14 #   remoterepos         for rsync, in form user@host:/dir
  15 # and optionally
  16 #   hooktimeout         default 30 [sec]
  17 #   rsynctimeout        default 900 [sec]
  18 #   rsyncssh            default 'ssh -o batchmode=yes'
  19 #   rsync               array, default (rsync -rltH --safe-links --delete)
  20 #   repos               default DISTRO-DIR/repos
  21 # (optional settings are all set before mirror-settings is included,
  22 # so you can modify them with += or some such)
  23
  24 set -e
  25 set -o pipefail
  26 shopt -s nullglob
  27
  28 case "$DGIT_DRS_DEBUG" in
  29 ''|0|1)         ;;
  30 *)              set -x  ;;
  31 esac
  32
  33 fail () {
  34         echo >&2 "dgit-mirror-rsync: $*"; exit 127
  35 }
  36
  37 if [ $# -lt 2 ]; then fail "too few arguments"; fi
  38
  39 self=$0
  40
  41 case "$self" in
  42 /*)                             ;;
  43 */*)    self="$PWD/$self"       ;;
  44 *)                              ;;
  45 esac
  46
  47 distrodir=$1;   shift
  48 action=$1;      shift
  49 package=$1
  50
  51 repos=$distrodir/repos
  52
  53 rsync=(rsync -rltH --safe-links --delete)
  54 hooktimeout=30
  55 rsynctimeout=900
  56 rsyncssh='ssh -o batchmode=yes'
  57
  58 . $distrodir/mirror-settings
  59
  60 # contents of $queue
  61 # $queue/$package.n     - mirror needed
  62 # $queue/$package.a     - being attempted, or attempt failed
  63 # $queue/$package.lock  - lock (with-lock-ex)
  64 # $queue/$package.err   - stderr from failed (or current) run
  65 # $queue/$package.log   - stderr from last successful run
  66
  67 cd $repos
  68 queue=_mirror-queue
  69
  70 case "$remoterepos" in
  71 *:/*|/*)        ;;
  72 '')             fail "remoterepos config not set" ;;
  73 *)              fail "remoterepos config does not match *:/* or /*" ;;
  74 esac
  75
  76 actually () {
  77         "${rsync[@]}" \
  78                 --timeout=$rsynctimeout                         \
  79                 -e "$rsyncssh"                                  \
  80                 "$repos/$package.git"/.                         \
  81                 "$remoterepos/$package.git"
  82 }
  83
  84 reinvoke () {
  85         newaction="$1"; shift
  86
  87         exec                                                    \
  88         "$@"                                                    \
  89         "$self" "$distrodir" "reinvoke$newaction" "$package"
  90 }
  91
  92 check-package-mirrorable () {
  93         local repo=$repos/$package.git
  94         local mode=$(stat -c%a "$repo")
  95         case $mode in
  96         *5)     return  0       ;;
  97         *0)     return  1       ;;
  98         *)      echo >&2 "unexpected mode $mode for $repo"; return 1    ;;
  99         esac
 100 }
 101
 102 lock-and-process () {
 103         check-package-mirrorable || return 0
 104         reinvoke -locked with-lock-ex -w "$queue/$package.lock"
 105 }
 106
 107 attempt () {
 108         exec 3>&2 >"$queue/$package.err" 2>&1
 109         if actually; then
 110                 rm -f "$queue/$package.a"
 111                 exec 2>&3 2>&1
 112                 mv -f "$queue/$package.err" "$queue/$package.log"
 113                 if ! [ -s "$queue/$package.log" ]; then
 114                         rm "$queue/$package.log"
 115                 fi
 116                 rm "$queue/$package.lock"
 117         else
 118                 cat >&3 "$queue/$package.err"
 119                 exit 127
 120         fi
 121 }
 122
 123 lock-and-process-baseof-f () {
 124         package=${f##*/}
 125         package=${package%.*}
 126         lock-and-process
 127 }
 128
 129 case "$action" in
 130
 131 updated-hook)
 132         check-package-mirrorable || exit 0
 133         touch "$queue/$package.n"
 134         reinvoke -timed timeout --foreground $hooktimeout
 135         ;;
 136
 137 reinvoke-timed)
 138         (lock-and-process) >/dev/null 2>&1
 139         ;;
 140
 141 mirror)
 142         lock-and-process
 143         ;;
 144
 145 reinvoke-locked)
 146         touch "$queue/$package.a"
 147         rm -f "$queue/$package.n"
 148         attempt
 149         ;;
 150
 151 backlog)
 152         for f in $queue/*.[na]; do
 153                 (lock-and-process-baseof-f ||:)
 154         done
 155         ;;
 156
 157 all)
 158         for f in [a-z0-9]*.git; do
 159                 (lock-and-process-baseof-f)
 160         done
 161         ;;
 162
 163 setup)
 164         test -d "$queue" || mkdir "$queue"
 165         ;;
 166
 167 *)
 168         fail "bad action $action"
 169         ;;
 170
 171 esac