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t5558: add tests for creationToken heuristic

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As documented in the bundle URI design doc in 2da14fad8f (docs:
document bundle URI standard, 2022-08-09), the 'creationToken' member of
a bundle URI allows a bundle provider to specify a total order on the
bundles.

Future changes will allow the Git client to understand these members and
modify its behavior around downloading the bundles in that order. In the
meantime, create tests that add creation tokens to the bundle list. For
now, the Git client correctly ignores these unknown keys.

Create a new test helper function, test_remote_https_urls, which filters
GIT_TRACE2_EVENT output to extract a list of URLs passed to
git-remote-https child processes. This can be used to verify the order
of these requests as we implement the creationToken heuristic. For now,
we need to sort the actual output since the current client does not have
a well-defined order that it applies to the bundles.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2023-01-31 13:29:11 +00:00 committed by Junio C Hamano
parent d9fd674c8b
commit 7bc73e7b61
2 changed files with 75 additions and 2 deletions
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69
t/t5558-clone-bundle-uri.sh
View file

@ -285,6 +285,8 @@ test_expect_success 'clone HTTP bundle' '
'
test_expect_success 'clone bundle list (HTTP, no heuristic)' '
test_when_finished rm -f trace*.txt &&
cp clone-from/bundle-*.bundle "$HTTPD_DOCUMENT_ROOT_PATH/" &&
cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
[bundle]
@ -304,12 +306,26 @@ test_expect_success 'clone bundle list (HTTP, no heuristic)' '
uri = $HTTPD_URL/bundle-4.bundle
EOF
git clone --bundle-uri="$HTTPD_URL/bundle-list" \
GIT_TRACE2_EVENT="$(pwd)/trace-clone.txt" \
git clone --bundle-uri="$HTTPD_URL/bundle-list" \
clone-from clone-list-http 2>err &&
! grep "Repository lacks these prerequisite commits" err &&
git -C clone-from for-each-ref --format="%(objectname)" >oids &&
git -C clone-list-http cat-file --batch-check <oids
git -C clone-list-http cat-file --batch-check <oids &&
cat >expect <<-EOF &&
$HTTPD_URL/bundle-1.bundle
$HTTPD_URL/bundle-2.bundle
$HTTPD_URL/bundle-3.bundle
$HTTPD_URL/bundle-4.bundle
$HTTPD_URL/bundle-list
EOF
# Sort the list, since the order is not well-defined
# without a heuristic.
test_remote_https_urls <trace-clone.txt | sort >actual &&
test_cmp expect actual
'
test_expect_success 'clone bundle list (HTTP, any mode)' '
@ -350,6 +366,55 @@ test_expect_success 'clone bundle list (HTTP, any mode)' '
test_cmp expect actual
'
test_expect_success 'clone bundle list (http, creationToken)' '
test_when_finished rm -f trace*.txt &&
cp clone-from/bundle-*.bundle "$HTTPD_DOCUMENT_ROOT_PATH/" &&
cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
[bundle]
version = 1
mode = all
heuristic = creationToken
[bundle "bundle-1"]
uri = bundle-1.bundle
creationToken = 1
[bundle "bundle-2"]
uri = bundle-2.bundle
creationToken = 2
[bundle "bundle-3"]
uri = bundle-3.bundle
creationToken = 3
[bundle "bundle-4"]
uri = bundle-4.bundle
creationToken = 4
EOF
GIT_TRACE2_EVENT="$(pwd)/trace-clone.txt" git \
clone --bundle-uri="$HTTPD_URL/bundle-list" \
"$HTTPD_URL/smart/fetch.git" clone-list-http-2 &&
git -C clone-from for-each-ref --format="%(objectname)" >oids &&
git -C clone-list-http-2 cat-file --batch-check <oids &&
cat >expect <<-EOF &&
$HTTPD_URL/bundle-1.bundle
$HTTPD_URL/bundle-2.bundle
$HTTPD_URL/bundle-3.bundle
$HTTPD_URL/bundle-4.bundle
$HTTPD_URL/bundle-list
EOF
# Since the creationToken heuristic is not yet understood by the
# client, the order cannot be verified at this moment. Sort the
# list for consistent results.
test_remote_https_urls <trace-clone.txt | sort >actual &&
test_cmp expect actual
'
# Do not add tests here unless they use the HTTP server, as they will
# not run unless the HTTP dependencies exist.

8
t/test-lib-functions.sh
View file

@ -1833,6 +1833,14 @@ test_region () {
return 0
}
# Given a GIT_TRACE2_EVENT log over stdin, writes to stdout a list of URLs
# sent to git-remote-https child processes.
test_remote_https_urls() {
grep -e '"event":"child_start".*"argv":\["git-remote-https",".*"\]' |
sed -e 's/{"event":"child_start".*"argv":\["git-remote-https","//g' \
-e 's/"\]}//g'
}
# Print the destination of symlink(s) provided as arguments. Basically
# the same as the readlink command, but it's not available everywhere.
test_readlink () {