d164b7548a
Instead of running a full git-count-objects to count all of the loose objects we can get a reasonably close approximation by counting the number of files in the .git/objects/42 subdirectory. This works out reasonably well because the SHA-1 hash has a fairly even distribution, so every .git/objects/?? subdirectory should get a relatively equal number of files. If we have at least 8 files in .git/objects/42 than it is very likely there is about 8 files in every other directory, leaving us with around 2048 loose objects. This check is much faster, as we need to only perform a readdir of a single directory, and we can do it directly from Tcl and avoid the costly fork+exec. All of the credit on how clever this is goes to Linus Torvalds; he suggested using this trick in a post commit hook to repack every so often. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>