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Linus Torvalds 230f13225d Create object subdirectories on demand

This makes it possible to have a "sparse" git object subdirectory
structure, something that has become much more attractive now that people
use pack-files all the time.

As a result of pack-files, a git object directory doesn't necessarily have
any individual objects lying around, and in that case it's just wasting
space to keep the empty first-level object directories around: on many
filesystems the 256 empty directories will be aboue 1MB of diskspace.

Even more importantly, after you re-pack a project that _used_ to be
unpacked, you could be left with huge directories that no longer contain
anything, but that waste space and take time to look through.

With this change, "git prune-packed" can just do an rmdir() on the
directories, and they'll get removed if empty, and re-created on demand.

This patch also tries to fix up "write_sha1_from_fd()" to use the new
common infrastructure for creating the object files, closing a hole where
we might otherwise leave half-written objects in the object database.

[jc: I unoptimized the part that really removes the fan-out directories
 to ease transition.  init-db still wastes 1MB of diskspace to hold 256
 empty fan-outs, and prune-packed rmdir()'s the grown but empty directories,
 but runs mkdir() immediately after that -- reducing the saving from 150KB
 to 146KB.  These parts will be re-introduced when everybody has the
 on-demand capability.]

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

2005-10-08 15:54:01 -07:00

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 #!/bin/sh
 #
 # Copyright (c) 2005 Junio C Hamano
 #
 test_description='Test the very basics part #1.
 The rest of the test suite does not check the basic operation of git
 plumbing commands to work very carefully.  Their job is to concentrate
 on tricky features that caused bugs in the past to detect regression.
 This test runs very basic features, like registering things in cache,
 writing tree, etc.
 Note that this test *deliberately* hard-codes many expected object
 IDs.  When object ID computation changes, like in the previous case of
 swapping compression and hashing order, the person who is making the
 modification *should* take notice and update the test vectors here.
 '
 . ./test-lib.sh
 ################################################################
 # init-db has been done in an empty repository.
 # make sure it is empty.
 find .git/objects -type f -print >should-be-empty
 test_expect_success \
     '.git/objects should be empty after git-init-db in an empty repo.' \
     'cmp -s /dev/null should-be-empty'
 # also it should have 258 subdirectories; 256 fan-out anymore, pack, and info.
 # 259 is counting "objects" itself
 find .git/objects -type d -print >full-of-directories
 test_expect_success \
     '.git/objects should have 258 subdirectories.' \
     'test $(wc -l < full-of-directories) = 259'
 ################################################################
 # Basics of the basics
 # updating a new file without --add should fail.
 test_expect_failure \
     'git-update-index without --add should fail adding.' \
     'git-update-index should-be-empty'
 # and with --add it should succeed, even if it is empty (it used to fail).
 test_expect_success \
     'git-update-index with --add should succeed.' \
     'git-update-index --add should-be-empty'
 test_expect_success \
     'writing tree out with git-write-tree' \
     'tree=$(git-write-tree)'
 # we know the shape and contents of the tree and know the object ID for it.
 test_expect_success \
     'validate object ID of a known tree.' \
     'test "$tree" = 7bb943559a305bdd6bdee2cef6e5df2413c3d30a'
 # Removing paths.
 rm -f should-be-empty full-of-directories
 test_expect_failure \
     'git-update-index without --remove should fail removing.' \
     'git-update-index should-be-empty'
 test_expect_success \
     'git-update-index with --remove should be able to remove.' \
     'git-update-index --remove should-be-empty'
 # Empty tree can be written with recent write-tree.
 test_expect_success \
     'git-write-tree should be able to write an empty tree.' \
     'tree=$(git-write-tree)'
 test_expect_success \
     'validate object ID of a known tree.' \
     'test "$tree" = 4b825dc642cb6eb9a060e54bf8d69288fbee4904'
 # Various types of objects
 mkdir path2 path3 path3/subp3
 for p in path0 path2/file2 path3/file3 path3/subp3/file3
 do
     echo "hello $p" >$p
     ln -s "hello $p" ${p}sym
 done
 test_expect_success \
     'adding various types of objects with git-update-index --add.' \
     'find path* ! -type d -print | xargs git-update-index --add'
 # Show them and see that matches what we expect.
 test_expect_success \
     'showing stage with git-ls-files --stage' \
     'git-ls-files --stage >current'
 cat >expected <<\EOF
 f87290f8eb2cbbea7857214459a0739927eab154 0	path0
 15a98433ae33114b085f3eb3bb03b832b3180a01 0	path0sym
 3feff949ed00a62d9f7af97c15cd8a30595e7ac7 0	path2/file2
 d8ce161addc5173867a3c3c730924388daedbc38 0	path2/file2sym
 0aa34cae68d0878578ad119c86ca2b5ed5b28376 0	path3/file3
 8599103969b43aff7e430efea79ca4636466794f 0	path3/file3sym
 00fb5908cb97c2564a9783c0c64087333b3b464f 0	path3/subp3/file3
 6649a1ebe9e9f1c553b66f5a6e74136a07ccc57c 0	path3/subp3/file3sym
 EOF
 test_expect_success \
     'validate git-ls-files output for a known tree.' \
     'diff current expected'
 test_expect_success \
     'writing tree out with git-write-tree.' \
     'tree=$(git-write-tree)'
 test_expect_success \
     'validate object ID for a known tree.' \
     'test "$tree" = 087704a96baf1c2d1c869a8b084481e121c88b5b'
 test_expect_success \
     'showing tree with git-ls-tree' \
     'git-ls-tree $tree >current'
 cat >expected <<\EOF
 blob f87290f8eb2cbbea7857214459a0739927eab154	path0
 blob 15a98433ae33114b085f3eb3bb03b832b3180a01	path0sym
 tree 58a09c23e2ca152193f2786e06986b7b6712bdbe	path2
 tree 21ae8269cacbe57ae09138dcc3a2887f904d02b3	path3
 EOF
 test_expect_success \
     'git-ls-tree output for a known tree.' \
     'diff current expected'
 test_expect_success \
     'showing tree with git-ls-tree -r' \
     'git-ls-tree -r $tree >current'
 cat >expected <<\EOF
 blob f87290f8eb2cbbea7857214459a0739927eab154	path0
 blob 15a98433ae33114b085f3eb3bb03b832b3180a01	path0sym
 tree 58a09c23e2ca152193f2786e06986b7b6712bdbe	path2
 blob 3feff949ed00a62d9f7af97c15cd8a30595e7ac7	path2/file2
 blob d8ce161addc5173867a3c3c730924388daedbc38	path2/file2sym
 tree 21ae8269cacbe57ae09138dcc3a2887f904d02b3	path3
 blob 0aa34cae68d0878578ad119c86ca2b5ed5b28376	path3/file3
 blob 8599103969b43aff7e430efea79ca4636466794f	path3/file3sym
 tree 3c5e5399f3a333eddecce7a9b9465b63f65f51e2	path3/subp3
 blob 00fb5908cb97c2564a9783c0c64087333b3b464f	path3/subp3/file3
 blob 6649a1ebe9e9f1c553b66f5a6e74136a07ccc57c	path3/subp3/file3sym
 EOF
 test_expect_success \
     'git-ls-tree -r output for a known tree.' \
     'diff current expected'
 ################################################################
 rm .git/index
 test_expect_success \
     'git-read-tree followed by write-tree should be idempotent.' \
     'git-read-tree $tree &&
      test -f .git/index &&
      newtree=$(git-write-tree) &&
      test "$newtree" = "$tree"'
 cat >expected <<\EOF
 :100644 100644 f87290f8eb2cbbea7857214459a0739927eab154 0000000000000000000000000000000000000000 M	path0
 :120000 120000 15a98433ae33114b085f3eb3bb03b832b3180a01 0000000000000000000000000000000000000000 M	path0sym
 :100644 100644 3feff949ed00a62d9f7af97c15cd8a30595e7ac7 0000000000000000000000000000000000000000 M	path2/file2
 :120000 120000 d8ce161addc5173867a3c3c730924388daedbc38 0000000000000000000000000000000000000000 M	path2/file2sym
 :100644 100644 0aa34cae68d0878578ad119c86ca2b5ed5b28376 0000000000000000000000000000000000000000 M	path3/file3
 :120000 120000 8599103969b43aff7e430efea79ca4636466794f 0000000000000000000000000000000000000000 M	path3/file3sym
 :100644 100644 00fb5908cb97c2564a9783c0c64087333b3b464f 0000000000000000000000000000000000000000 M	path3/subp3/file3
 :120000 120000 6649a1ebe9e9f1c553b66f5a6e74136a07ccc57c 0000000000000000000000000000000000000000 M	path3/subp3/file3sym
 EOF
 test_expect_success \
     'validate git-diff-files output for a know cache/work tree state.' \
     'git-diff-files >current && diff >/dev/null -b current expected'
 test_expect_success \
     'git-update-index --refresh should succeed.' \
     'git-update-index --refresh'
 test_expect_success \
     'no diff after checkout and git-update-index --refresh.' \
     'git-diff-files >current && cmp -s current /dev/null'
 test_done