Subject: Re: PATCH[1/4]: Allow tree-id to return the ID of a tree object

From: Philip Pokorny <[email-masked]>
Date: Thu, 28 Apr 2005 00:14:13 -0700

Patch to re-introduce cg-Xnormid for common ID normalizing.

Signed-off-by: Philip Pokorny <[email-masked]>

Index: cg-Xnormid
===================================================================
--- /dev/null  (tree:6ad600e20c89323c1d3049f75b8ca9b0a2d72167)
+++ uncommitted/cg-Xnormid  (mode:100755 sha1:6dc089c8d571f330e2e01d96f79616d6146840ee)
@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+#
+# Normalize an ID to an SHA1 hash value
+#    Strings resolve in order:
+#       NULL, this, HEAD  => .git/HEAD
+#       <tags>
+#       <heads>
+#       short SHA1 (4 or more hex digits)
+#
+# Copyright (c) Philip Pokorny, 2005
+
+id="$1"
+
+if [ ! "$id" ] || [ "$id" = "this" ] || [ "$id" = "HEAD" ]; then
+	read id < .git/HEAD
+
+elif [ -r ".git/refs/tags/$id" ]; then
+	read id < ".git/refs/tags/$id"
+
+elif [ -r ".git/refs/heads/$id" ]; then
+	read id < ".git/refs/heads/$id"
+
+# Short id's must be lower case and at least 4 digits.
+elif [[ "$id" == [0-9a-z][0-9a-z][0-9a-z][0-9a-z]* ]]; then
+	idpost=${id#??}
+	idpref=${id%$idpost}
+
+	# Assign array elements to matching names
+	idmatch=(.git/objects/$idpref/$idpost*)
+
+	if [ ${#idmatch[*]} -eq 1 ] && [ -r "$idmatch" ]; then
+		id=$idpref${idmatch#.git/objects/$idpref/}
+	elif [ ${#idmatch[*]} -gt 1 ]; then
+		echo "Ambiguous id: $id" >&2
+		exit 1
+	fi
+fi
+
+# FIXME? Should we verify the existance of the ID in the object cache?
+
+# If we don't have a 40-char ID by now, it's an error
+if [ ${#id} -ne 40 ]; then
+	echo "Invalid id: $id" >&2
+	exit 1
+fi
+
+echo $id
Index: Makefile
===================================================================
--- 6ad600e20c89323c1d3049f75b8ca9b0a2d72167/Makefile  (mode:100644 sha1:d73bea1cbb9451a89b03d6066bf2ed7fec32fd31)
+++ uncommitted/Makefile  (mode:100664)
@@ -44,7 +44,7 @@
 	cg-add cg-admin-lsobj cg-cancel cg-clone cg-commit cg-diff \
 	cg-export cg-help cg-init cg-log cg-ls cg-merge cg-mkpatch \
 	cg-patch cg-pull cg-branch-add cg-branch-ls cg-rm cg-seek cg-status \
-	cg-tag cg-update cg-Xlib
+	cg-tag cg-update cg-Xlib cg-Xnormid
 
 COMMON=	read-cache.o