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+#!/bin/sh
+#
+# This test covers the handling of objects which might have old
+# mtimes in the filesystem (because they were used previously)
+# and are just now becoming referenced again.
+#
+# We're going to do two things that are a little bit "fake" to
+# help make our simulation easier:
+#
+# 1. We'll turn off reflogs. You can still run into
+# problems with reflogs on, but your objects
+# don't get pruned until both the reflog expiration
+# has passed on their references, _and_ they are out
+# of prune's expiration period. Dropping reflogs
+# means we only have to deal with one variable in our tests,
+# but the results generalize.
+#
+# 2. We'll use a temporary index file to create our
+# works-in-progress. Most workflows would mention
+# referenced objects in the index, which prune takes
+# into account. However, many operations don't. For
+# example, a partial commit with "git commit foo"
+# will use a temporary index. Or they may not need
+# an index at all (e.g., creating a new commit
+# to refer to an existing tree).
+
+test_description='check pruning of dependent objects'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+# We care about reachability, so we do not want to use
+# the normal test_commit, which creates extra tags.
+add () {
+ echo "$1" >"$1" &&
+ git add "$1"
+}
+commit () {
+ test_tick &&
+ add "$1" &&
+ git commit -m "$1"
+}
+
+maybe_repack () {
+ case "$title" in
+ loose)
+ : skip repack
+ ;;
+ repack)
+ git repack -ad
+ ;;
+ bitmap)
+ git repack -adb
+ ;;
+ *)
+ echo >&2 "unknown test type in maybe_repack"
+ return 1
+ ;;
+ esac
+}
+
+for title in loose repack bitmap
+do
+ test_expect_success "make repo completely empty ($title)" '
+ rm -rf .git &&
+ git init
+ '
+
+ test_expect_success "disable reflogs ($title)" '
+ git config core.logallrefupdates false &&
+ git reflog expire --expire=all --all
+ '
+
+ test_expect_success "setup basic history ($title)" '
+ commit base
+ '
+
+ test_expect_success "create and abandon some objects ($title)" '
+ git checkout -b experiment &&
+ commit abandon &&
+ maybe_repack &&
+ git checkout main &&
+ git branch -D experiment
+ '
+
+ test_expect_success "simulate time passing ($title)" '
+ test-tool chmtime --get -86400 $(find .git/objects -type f)
+ '
+
+ test_expect_success "start writing new commit with old blob ($title)" '
+ tree=$(
+ GIT_INDEX_FILE=index.tmp &&
+ export GIT_INDEX_FILE &&
+ git read-tree HEAD &&
+ add unrelated &&
+ add abandon &&
+ git write-tree
+ )
+ '
+
+ test_expect_success "simultaneous gc ($title)" '
+ git gc --prune=12.hours.ago
+ '
+
+ test_expect_success "finish writing out commit ($title)" '
+ commit=$(echo foo | git commit-tree -p HEAD $tree) &&
+ git update-ref HEAD $commit
+ '
+
+ # "abandon" blob should have been rescued by reference from new tree
+ test_expect_success "repository passes fsck ($title)" '
+ git fsck
+ '
+
+ test_expect_success "abandon objects again ($title)" '
+ git reset --hard HEAD^ &&
+ test-tool chmtime --get -86400 $(find .git/objects -type f)
+ '
+
+ test_expect_success "start writing new commit with same tree ($title)" '
+ tree=$(
+ GIT_INDEX_FILE=index.tmp &&
+ export GIT_INDEX_FILE &&
+ git read-tree HEAD &&
+ add abandon &&
+ add unrelated &&
+ git write-tree
+ )
+ '
+
+ test_expect_success "simultaneous gc ($title)" '
+ git gc --prune=12.hours.ago
+ '
+
+ # tree should have been refreshed by write-tree
+ test_expect_success "finish writing out commit ($title)" '
+ commit=$(echo foo | git commit-tree -p HEAD $tree) &&
+ git update-ref HEAD $commit
+ '
+done
+
+test_expect_success 'do not complain about existing broken links (commit)' '
+ cat >broken-commit <<-EOF &&
+ tree $(test_oid 001)
+ parent $(test_oid 002)
+ author whatever <whatever@example.com> 1234 -0000
+ committer whatever <whatever@example.com> 1234 -0000
+
+ some message
+ EOF
+ commit=$(git hash-object -t commit -w broken-commit) &&
+ git gc -q 2>stderr &&
+ verbose git cat-file -e $commit &&
+ test_must_be_empty stderr
+'
+
+test_expect_success 'do not complain about existing broken links (tree)' '
+ cat >broken-tree <<-EOF &&
+ 100644 blob $(test_oid 003) foo
+ EOF
+ tree=$(git mktree --missing <broken-tree) &&
+ git gc -q 2>stderr &&
+ git cat-file -e $tree &&
+ test_must_be_empty stderr
+'
+
+test_expect_success 'do not complain about existing broken links (tag)' '
+ cat >broken-tag <<-EOF &&
+ object $(test_oid 004)
+ type commit
+ tag broken
+ tagger whatever <whatever@example.com> 1234 -0000
+
+ this is a broken tag
+ EOF
+ tag=$(git hash-object -t tag -w broken-tag) &&
+ git gc -q 2>stderr &&
+ git cat-file -e $tag &&
+ test_must_be_empty stderr
+'
+
+test_done