From 9cca9ddd4dce9d481a3ab9594d8cf8f74cde6677 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Tue, 23 Jul 2019 02:15:37 -0400
Subject: use authorized_keys.d to set $user to the basename

---
 hooks/post-receive | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/hooks/post-receive b/hooks/post-receive
index 4e85b42..67e7610 100755
--- a/hooks/post-receive
+++ b/hooks/post-receive
@@ -4,5 +4,34 @@ then
     GIT_WORK_TREE=. git checkout -f master -- hooks/post-receive
     DID_SELF_UPDATE=y exec hooks/post-receive
 fi
+exec >&2
 
-echo 'Hello, world!' >&2
+GIT_WORK_TREE=. git checkout -f master -- authorized_keys.d/\*
+
+if [ "$SSH_USER_AUTH" ] && [ -f "$SSH_USER_AUTH" ]
+then
+    read authtype keytype keyval < "$SSH_USER_AUTH"
+    [ "$authtype" = publickey ] || exit
+
+    user=
+    for keyname in authorized_keys.d/*
+    do
+        while read a b _
+        do
+            case "$a $b" in
+                "$keytype $keyval")
+                    user=${keyname#authorized_keys.d/}
+                    break
+                    ;;
+            esac
+        done < "$keyname"
+    done
+
+    if [ "$user" ]
+    then
+        echo "user=$user"
+    fi
+
+else
+    echo "\$SSH_USER_AUTH missing.  Try putting 'ExposeAuthInfo yes' in /etc/ssh/sshd_config"
+fi
-- 
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