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+From: Matthew Wilcox <matthew@wil.cx>
+To: 383219@bugs.debian.org
+Cc: Roland Mas <lolando@debian.org>
+Subject: index.aux generation
+Date: Thu, 24 Aug 2006 08:55:10 -0600
+
+Alioth needs to generate an index.aux file.  It'd be helpful if we had
+an example script for doing this.  Here's the script used for
+git.infradead.org (MIT licence, says its author):
+
+--- cut ---
+#!/bin/sh
+
+cd /home
+for a in * ; do [ -r $a/public_git ] && [ ! -d /home/git/users/$a ] && ln -s /home/$a/public_git /home/git/users/$a ; done
+
+cd /home/git
+find . -name 'HEAD' | grep ^[-./=+a-zA-Z0-9]*\$ | sed s:/HEAD\$:: | while read DIR ; do
+        TREEUID=`stat -c %U $DIR`
+        TREEUSERNAME=`grep ^$TREEUID: /etc/passwd | cut -f5 -d: | sed s/\ /+/`
+        if [ "$TREEUSERNAME" = "" ]; then
+                TREEUSERNAME=$TREEUID
+        fi
+        echo $DIR $TREEUSERNAME | sed s:/:%2F:g
+done > /home/git/.index.aux.$$
+
+mv /home/git/.index.aux.$$ /home/git/.index.aux
+
+--- cut ---
+
+I suspect Alioth wants something like (untested ...)
+
+cd /srv/git.debian.org/git
+ls */*/HEAD | grep ^[-./=+a-zA-Z0-9]*\$ | sed s:/HEAD\$:: | while read DIR ; do
+        TREEUID=`stat -c %U $DIR`
+        TREEUSERNAME=`XXX`
+        if [ "$TREEUSERNAME" = "" ]; then
+                TREEUSERNAME=$TREEUID
+        fi
+        echo $DIR $TREEUSERNAME | sed s:/:%2F:g
+done > /srv/git.debian.org/.index.aux.$$
+
+mv /srv/git.debian.org/.index.aux.$$ /srv/git.debian.org/.index.aux
+
+where XXX would be how to turn a username into the name of a user.
+I dunno how Alioth works; ldap or postgres db seem plausible answers.