[PATCH] Update documentation for git-get-tar-commit-id

... and add a copyright notice.

[jc: also move its entry in git.txt from undocumented section.]
Signed-off-by: NRene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Documentation/git-get-tar-commit-id.txt

@@ -3,25 +3,24 @@ git-get-tar-commit-id(1)
 
 NAME
 ----
-git-get-tar-commit-id - Some git command not yet documented.
+git-get-tar-commit-id - Extract commit ID from an archive created using git-tar-tree.
 
 
 SYNOPSIS
 --------
-'git-get-tar-commit-id' [ --option ] <args>...
+'git-get-tar-commit-id' < <tarfile>
+
 
 DESCRIPTION
 -----------
-Does something not yet documented.
-
-
-OPTIONS
--------
---option::
-	Some option not yet documented.
-
-<args>...::
-	Some argument not yet documented.
+Acts as a filter, extracting the commit ID stored in archives created by
+git-tar-tree.  It reads only the first 1024 bytes of input, thus its
+runtime is not influenced by the size of <tarfile> very much.
+
+If no commit ID is found, git-get-tar-commit-id quietly exists with a
+return code of 1.  This can happen if <tarfile> had not been created
+using git-tar-tree or if the first parameter of git-tar-tree had been
+a tree ID instead of a commit ID or tag.
 
 
 Author

Documentation/git.txt

@@ -319,6 +319,8 @@ link:git-patch-id.html[git-patch-id]::
 link:git-send-email-script.html[git-send-email]::
 	Send patch e-mails out of "format-patch --mbox" output.
 
+link:git-get-tar-commit-id.html[git-get-tar-commit-id]::
+	Extract commit ID from an archive created using git-tar-tree.
 
 Commands not yet documented
 ---------------------------
@@ -338,9 +340,6 @@ link:git-diff-script.html[git-diff-script]::
 link:git-format-patch-script.html[git-format-patch-script]::
 	git-format-patch-script.
 
-link:git-get-tar-commit-id.html[git-get-tar-commit-id]::
-	git-get-tar-commit-id.
-
 link:git-request-pull-script.html[git-request-pull-script]::
 	git-request-pull-script.
 

get-tar-commit-id.c

+/*
+ * Copyright (C) 2005 Rene Scharfe
+ */
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>