write_sha1_file: freshen existing objects
[git/git.git] / t / t6501-freshen-objects.sh
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1#!/bin/sh
2#
3# This test covers the handling of objects which might have old
4# mtimes in the filesystem (because they were used previously)
5# and are just now becoming referenced again.
6#
7# We're going to do two things that are a little bit "fake" to
8# help make our simulation easier:
9#
10# 1. We'll turn off reflogs. You can still run into
11# problems with reflogs on, but your objects
12# don't get pruned until both the reflog expiration
13# has passed on their references, _and_ they are out
14# of prune's expiration period. Dropping reflogs
15# means we only have to deal with one variable in our tests,
16# but the results generalize.
17#
18# 2. We'll use a temporary index file to create our
19# works-in-progress. Most workflows would mention
20# referenced objects in the index, which prune takes
21# into account. However, many operations don't. For
22# example, a partial commit with "git commit foo"
23# will use a temporary index. Or they may not need
24# an index at all (e.g., creating a new commit
25# to refer to an existing tree).
26
27test_description='check pruning of dependent objects'
28. ./test-lib.sh
29
30# We care about reachability, so we do not want to use
31# the normal test_commit, which creates extra tags.
32add () {
33 echo "$1" >"$1" &&
34 git add "$1"
35}
36commit () {
37 test_tick &&
38 add "$1" &&
39 git commit -m "$1"
40}
41
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42maybe_repack () {
43 if test -n "$repack"; then
44 git repack -ad
45 fi
46}
47
48for repack in '' true; do
49 title=${repack:+repack}
50 title=${title:-loose}
51
52 test_expect_success "make repo completely empty ($title)" '
53 rm -rf .git &&
54 git init
55 '
56
57 test_expect_success "disable reflogs ($title)" '
58 git config core.logallrefupdates false &&
59 rm -rf .git/logs
60 '
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62 test_expect_success "setup basic history ($title)" '
63 commit base
64 '
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66 test_expect_success "create and abandon some objects ($title)" '
67 git checkout -b experiment &&
68 commit abandon &&
69 maybe_repack &&
70 git checkout master &&
71 git branch -D experiment
72 '
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74 test_expect_success "simulate time passing ($title)" '
75 find .git/objects -type f |
76 xargs test-chmtime -v -86400
77 '
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79 test_expect_success "start writing new commit with old blob ($title)" '
80 tree=$(
81 GIT_INDEX_FILE=index.tmp &&
82 export GIT_INDEX_FILE &&
83 git read-tree HEAD &&
84 add unrelated &&
85 add abandon &&
86 git write-tree
87 )
88 '
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90 test_expect_success "simultaneous gc ($title)" '
91 git gc --prune=12.hours.ago
92 '
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94 test_expect_success "finish writing out commit ($title)" '
95 commit=$(echo foo | git commit-tree -p HEAD $tree) &&
96 git update-ref HEAD $commit
97 '
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99 # "abandon" blob should have been rescued by reference from new tree
100 test_expect_success "repository passes fsck ($title)" '
101 git fsck
102 '
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103
104 test_expect_success "abandon objects again ($title)" '
105 git reset --hard HEAD^ &&
106 find .git/objects -type f |
107 xargs test-chmtime -v -86400
108 '
109
110 test_expect_success "start writing new commit with same tree ($title)" '
111 tree=$(
112 GIT_INDEX_FILE=index.tmp &&
113 export GIT_INDEX_FILE &&
114 git read-tree HEAD &&
115 add abandon &&
116 add unrelated &&
117 git write-tree
118 )
119 '
120
121 test_expect_success "simultaneous gc ($title)" '
122 git gc --prune=12.hours.ago
123 '
124
125 # tree should have been refreshed by write-tree
126 test_expect_success "finish writing out commit ($title)" '
127 commit=$(echo foo | git commit-tree -p HEAD $tree) &&
128 git update-ref HEAD $commit
129 '
abcb8655 130done
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131
132test_done