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bundle: add new version for use with SHA-256

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Currently we detect the hash algorithm in use by the length of the
object ID.  This is inelegant and prevents us from using a different
hash algorithm that is also 256 bits in length.

Since we cannot extend the v2 format in a backward-compatible way, let's
add a v3 format, which is identical, except for the addition of
capabilities, which are prefixed by an at sign.  We add "object-format"
as the only capability and reject unknown capabilities, since we do not
have a network connection and therefore cannot negotiate with the other
side.

For compatibility, default to the v2 format for SHA-1 and require v3
for SHA-256.

In t5510, always use format v3 so we can be sure we produce consistent
results across hash algorithms.  Since head -n N lists the top N lines
instead of the Nth line, let's run our output through sed to normalize
it and compare it against a fixed value, which will make sure we get
exactly what we're expecting.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson
2020-07-29 23:14:20 +00:00
committed by Junio C Hamano
parent e74b606d47
commit c5aecfc866
7 changed files with 147 additions and 31 deletions
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31
t/t5607-clone-bundle.sh
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@ -4,6 +4,10 @@ test_description='some bundle related tests'
. ./test-lib.sh
test_expect_success 'setup' '
test_oid_cache <<-EOF &&
version sha1:2
version sha256:3
EOF
test_commit initial &&
test_tick &&
git tag -m tag tag &&
@ -94,4 +98,31 @@ test_expect_success 'fetch SHA-1 from bundle' '
git fetch --no-tags foo/tip.bundle "$(cat hash)"
'
test_expect_success 'git bundle uses expected default format' '
git bundle create bundle HEAD^.. &&
head -n1 bundle | grep "^# v$(test_oid version) git bundle$"
'
test_expect_success 'git bundle v3 has expected contents' '
git branch side HEAD &&
git bundle create --version=3 bundle HEAD^..side &&
head -n2 bundle >actual &&
cat >expect <<-EOF &&
# v3 git bundle
@object-format=$(test_oid algo)
EOF
test_cmp expect actual &&
git bundle verify bundle
'
test_expect_success 'git bundle v3 rejects unknown capabilities' '
cat >new <<-EOF &&
# v3 git bundle
@object-format=$(test_oid algo)
@unknown=silly
EOF
test_must_fail git bundle verify new 2>output &&
test_i18ngrep "unknown capability .unknown=silly." output
'
test_done