143 lines
4.3 KiB
Bash
Executable file
143 lines
4.3 KiB
Bash
Executable file
#!/bin/sh
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test_description='exercise delta islands'
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. ./test-lib.sh
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# returns true iff $1 is a delta based on $2
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is_delta_base () {
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delta_base=$(echo "$1" | git cat-file --batch-check='%(deltabase)') &&
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echo >&2 "$1 has base $delta_base" &&
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test "$delta_base" = "$2"
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}
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# generate a commit on branch $1 with a single file, "file", whose
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# content is mostly based on the seed $2, but with a unique bit
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# of content $3 appended. This should allow us to see whether
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# blobs of different refs delta against each other.
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commit() {
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blob=$({ test-tool genrandom "$2" 10240 && echo "$3"; } |
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git hash-object -w --stdin) &&
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tree=$(printf '100644 blob %s\tfile\n' "$blob" | git mktree) &&
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commit=$(echo "$2-$3" | git commit-tree "$tree" ${4:+-p "$4"}) &&
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git update-ref "refs/heads/$1" "$commit" &&
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eval "$1"'=$(git rev-parse $1:file)' &&
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eval "echo >&2 $1=\$$1"
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}
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test_expect_success 'setup commits' '
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commit one seed 1 &&
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commit two seed 12
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'
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# Note: This is heavily dependent on the "prefer larger objects as base"
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# heuristic.
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test_expect_success 'vanilla repack deltas one against two' '
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git repack -adf &&
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is_delta_base $one $two
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'
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test_expect_success 'island repack with no island definition is vanilla' '
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git repack -adfi &&
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is_delta_base $one $two
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'
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test_expect_success 'island repack with no matches is vanilla' '
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git -c "pack.island=refs/foo" repack -adfi &&
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is_delta_base $one $two
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'
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test_expect_success 'separate islands disallows delta' '
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git -c "pack.island=refs/heads/(.*)" repack -adfi &&
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! is_delta_base $one $two &&
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! is_delta_base $two $one
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'
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test_expect_success 'same island allows delta' '
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git -c "pack.island=refs/heads" repack -adfi &&
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is_delta_base $one $two
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'
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test_expect_success 'coalesce same-named islands' '
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git \
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-c "pack.island=refs/(.*)/one" \
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-c "pack.island=refs/(.*)/two" \
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repack -adfi &&
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is_delta_base $one $two
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'
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test_expect_success 'island restrictions drop reused deltas' '
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git repack -adfi &&
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is_delta_base $one $two &&
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git -c "pack.island=refs/heads/(.*)" repack -adi &&
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! is_delta_base $one $two &&
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! is_delta_base $two $one
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'
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test_expect_success 'island regexes are left-anchored' '
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git -c "pack.island=heads/(.*)" repack -adfi &&
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is_delta_base $one $two
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'
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test_expect_success 'island regexes follow last-one-wins scheme' '
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git \
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-c "pack.island=refs/heads/(.*)" \
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-c "pack.island=refs/heads/" \
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repack -adfi &&
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is_delta_base $one $two
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'
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test_expect_success 'setup shared history' '
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commit root shared root &&
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commit one shared 1 root &&
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commit two shared 12-long root
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'
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# We know that $two will be preferred as a base from $one,
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# because we can transform it with a pure deletion.
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#
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# We also expect $root as a delta against $two by the "longest is base" rule.
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test_expect_success 'vanilla delta goes between branches' '
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git repack -adf &&
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is_delta_base $one $two &&
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is_delta_base $root $two
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'
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# Here we should allow $one to base itself on $root; even though
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# they are in different islands, the objects in $root are in a superset
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# of islands compared to those in $one.
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#
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# Similarly, $two can delta against $root by our rules. And unlike $one,
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# in which we are just allowing it, the island rules actually put $root
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# as a possible base for $two, which it would not otherwise be (due to the size
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# sorting).
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test_expect_success 'deltas allowed against superset islands' '
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git -c "pack.island=refs/heads/(.*)" repack -adfi &&
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is_delta_base $one $root &&
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is_delta_base $two $root
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'
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# We are going to test the packfile order here, so we again have to make some
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# assumptions. We assume that "$root", as part of our core "one", must come
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# before "$two". This should be guaranteed by the island code. However, for
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# this test to fail without islands, we are also assuming that it would not
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# otherwise do so. This is true by the current write order, which will put
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# commits (and their contents) before their parents.
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test_expect_success 'island core places core objects first' '
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cat >expect <<-EOF &&
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$root
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$two
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EOF
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git -c "pack.island=refs/heads/(.*)" \
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-c "pack.islandcore=one" \
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repack -adfi &&
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git verify-pack -v .git/objects/pack/*.pack |
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cut -d" " -f1 |
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egrep "$root|$two" >actual &&
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test_cmp expect actual
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'
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test_expect_success 'unmatched island core is not fatal' '
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git -c "pack.islandcore=one" repack -adfi
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'
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test_done
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