update-index: do not die too early in a read-only repository.

diff --git a/Documentation/git-gc.txt b/Documentation/git-gc.txt
index 73d78c15e8a30ac11e919f43888ec589ac701e37..bc1658434a61bdba41699859f103a3c8e0802d95 100644 (file)
--- a/Documentation/git-gc.txt
+++ b/Documentation/git-gc.txt
@@ -8,7 +8,7 @@ git-gc - Cleanup unnecessary files and optimize the local repository
 
 SYNOPSIS
 --------
-'git-gc'
+'git-gc' [--prune]
 
 DESCRIPTION
 -----------
@@ -21,6 +21,21 @@ Users are encouraged to run this task on a regular basis within
 each repository to maintain good disk space utilization and good
 operating performance.
 
+OPTIONS
+-------
+
+--prune::
+       Usually `git-gc` packs refs, expires old reflog entries,
+       packs loose objects,
+       and removes old 'rerere' records.  Removal
+       of unreferenced loose objects is an unsafe operation
+       while other git operations are in progress, so it is not
+       done by default.  Pass this option if you want it, and only
+       when you know nobody else is creating new objects in the
+       repository at the same time (e.g. never use this option
+       in a cron script).
+
+
 Configuration
 -------------
 
@@ -35,7 +50,7 @@ can be set to indicate how long historical reflog entries which
 are not part of the current branch should remain available in
 this repository.  These types of entries are generally created as
 a result of using `git commit \--amend` or `git rebase` and are the
-commits prior to the amend or rebase occuring.  Since these changes
+commits prior to the amend or rebase occurring.  Since these changes
 are not part of the current project most users will want to expire
 them sooner.  This option defaults to '30 days'.
 
@@ -47,6 +62,10 @@ The optional configuration variable 'gc.rerereunresolved' indicates
 how long records of conflicted merge you have not resolved are
 kept.  This defaults to 15 days.
 
+The optional configuration variable 'gc.packrefs' determines if
+`git gc` runs `git-pack-refs`.  Without the configuration, `git-pack-refs`
+is not run in bare repositories by default, to allow older dumb-transport
+clients fetch from the repository,  but this will change in the future.
 
 See Also
 --------