From 62667708bdd5f4efd183926b94110d808b3171e2 Mon Sep 17 00:00:00 2001
From: lassulus <lass@aidsballs.de>
Date: Fri, 15 May 2015 23:19:51 +0200
Subject: gitolite: add irc-announce hook

---
 modules/lass/desktop-base.nix | 118 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)

diff --git a/modules/lass/desktop-base.nix b/modules/lass/desktop-base.nix
index 7c3b4c41..c6a9231e 100644
--- a/modules/lass/desktop-base.nix
+++ b/modules/lass/desktop-base.nix
@@ -69,6 +69,124 @@
     enable = true;
     dataDir = "/home/gitolite";
     adminPubkey = config.sshKeys.lass.pub;
+    commonHooks = [
+      (pkgs.writeText "irc-announce" ''
+        #! /bin/sh
+        set -euf
+
+        config_file="$GL_ADMIN_BASE/conf/irc-announce.conf"
+        if test -f "$config_file"; then
+          . "$config_file"
+        fi
+
+        # XXX when changing IRC_CHANNEL or IRC_SERVER/_PORT, don't forget to update
+        #     any relevant gitolite LOCAL_CODE!
+        # CAVEAT we hope that IRC_NICK is unique
+        IRC_NICK="''${IRC_NICK-gl$GL_TID}"
+        IRC_CHANNEL="''${IRC_CHANNEL-#retiolum}"
+        IRC_SERVER="''${IRC_SERVER-ire.retiolum}"
+        IRC_PORT="''${IRC_PORT-6667}"
+
+        # for privmsg_cat below
+        export IRC_CHANNEL
+
+        # collect users that are mentioned in the gitolite configuration
+        interested_users="$(perl -e '
+          do "gl-conf";
+          print join(" ", keys%{ $one_repo{$ENV{"GL_REPO"}} });
+        ')"
+
+        # CAVEAT beware of real TABs in grep pattern!
+        # CAVEAT there will never be more than 42 relevant log entries!
+        log="$(tail -n 42 "$GL_LOGFILE" | grep "^[^ ]*  $GL_TID ")"
+        update_log="$(echo "$log" | grep "^[^ ]*  $GL_TID update")"
+
+        # (debug output)
+        env | sed 's/^/env: /'
+        echo "$log" | sed 's/^/log: /'
+
+        # see http://gitolite.com/gitolite/dev-notes.html#lff
+        reponame=$(echo "$update_log" | cut -f 4)
+        username=$(echo "$update_log" | cut -f 5)
+        ref_name=$(echo "$update_log" | cut -f 7 | sed 's|^refs/heads/||')
+        old_sha=$(echo "$update_log" | cut -f 8)
+        new_sha=$(echo "$update_log" | cut -f 9)
+
+        # check if new branch is created
+        if test $old_sha = 0000000000000000000000000000000000000000; then
+          # TODO what should we really show?
+          old_sha=$new_sha^
+        fi
+
+        #
+        git_log="$(git log $old_sha..$new_sha --pretty=oneline --abbrev-commit)"
+        commit_count=$(echo "$git_log" | wc -l)
+
+        # echo2 and cat2 are used output to both, stdout and stderr
+        # This is used to see what we send to the irc server. (debug output)
+        echo2() { echo "$*"; echo "$*" >&2; }
+        cat2() { tee /dev/stderr; }
+
+        # privmsg_cat transforms stdin to a privmsg
+        privmsg_cat() { awk '{ print "PRIVMSG "ENVIRON["IRC_CHANNEL"]" :"$0 }'; }
+
+        # ircin is used to feed the output of netcat back to the "irc client"
+        # so we can implement expect-like behavior with sed^_^
+        # XXX mkselfdestructingtmpfifo would be nice instead of this cruft
+        tmpdir="$(mktemp -d irc-announce_XXXXXXXX)"
+        cd "$tmpdir"
+        mkfifo ircin
+        trap "
+          rm ircin
+          cd '$OLDPWD'
+          rmdir '$tmpdir'
+          trap - EXIT INT QUIT
+        " EXIT INT QUIT
+
+        #
+        #
+        #
+        {
+          echo2 "USER $LOGNAME 0 * :$LOGNAME@$(hostname)"
+          echo2 "NICK $IRC_NICK"
+
+          # wait for MODE message
+          sed -n '/^:[^ ]* MODE /q'
+
+          echo2 "JOIN $IRC_CHANNEL"
+
+          echo "$interested_users" \
+            | tr ' ' '\n' \
+            | grep -v "^$GL_USER" \
+            | sed 's/$/: poke/' \
+            | privmsg_cat \
+            | cat2
+
+          printf '[13%s] %s pushed %s new commit%s to 6%s %s\n' \
+              "$reponame" \
+              "$username" \
+              "$commit_count" \
+              "$(test $commit_count = 1 || echo s)" \
+              "$(hostname)" \
+              "$ref_name" \
+            | privmsg_cat \
+            | cat2
+
+          echo "$git_log" \
+            | sed 's/^/14/;s/ / /' \
+            | privmsg_cat \
+            | cat2
+
+          echo2 "PART $IRC_CHANNEL"
+
+          # wait for PART confirmation
+          sed -n '/:'"$IRC_NICK"'![^ ]* PART /q'
+
+          echo2 'QUIT :Gone to have lunch'
+        } < ircin \
+          | nc "$IRC_SERVER" "$IRC_PORT" | tee -a ircin
+      '')
+    ];
   };
 
   services.journald.extraConfig = ''
-- 
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