bin/gitweb-gc.sh

   1 #!/bin/sh
   2 # Allow gitweb.cgi to be run from a fastcgi server that does
   3 # not really support periodic "garbage collection" exits
   4 # (even on an exit status of 0) without losing fastcgi requests.
   5 # Signals are forwarded in both directions.
   6 cgiroot=@cgiroot@
   7 bg=
   8 handle_sig() { [ -z "$bg" ] || kill -$1 "$bg" 2>/dev/null; }
   9 # backgrounding the cgi with '&' causes it to ignore SIGINT and SIGQUIT
  10 # therefore we redirect INT to TERM and QUIT to ABRT when forwarding those
  11 trap 'handle_sig HUP' HUP
  12 trap 'handle_sig ABRT' ABRT QUIT
  13 trap 'handle_sig PIPE' PIPE
  14 trap 'handle_sig ALRM' ALRM
  15 trap 'handle_sig TERM' TERM INT
  16 trap 'handle_sig USR1' USR1
  17 trap 'handle_sig USR2' USR2
  18 while :; do
  19         exec 3<&0
  20         (exec 0<&3 3<&-; exec "$cgiroot/gitweb.cgi" "$@")&
  21         bg="$!"
  22         exec 3<&-
  23         while :; do
  24                 ec=0
  25                 wait "$bg" || ec="$?"
  26                 kill -0 "$bg" 2>/dev/null || break
  27                 # was a signal to self that's now been forwarded
  28                 # go around the loop again
  29         done
  30         bg=
  31         [ "${ec:-0}" = "0" ] || break
  32         # was a gitweb "garbage collection" exit
  33         # go around the loop again and restart gitweb
  34 done
  35 trap - HUP INT QUIT ABRT PIPE ALRM TERM USR1 USR2
  36 if [ "${ec:-0}" -gt 128 ] && [ "${ec:-0}" -lt 160 ]; then
  37         # self terminate
  38         kill -$(($ec-128)) $$
  39 fi
  40 exit "$ec"