Files
git/t/t5503-tagfollow.sh
Patrick Steinhardt 23e21a58d5 t: introduce PERL_TEST_HELPERS prerequisite
In the early days of Git, Perl was used quite prominently throughout the
project. This has changed significantly as almost all of the executables
we ship nowadays have eventually been rewritten in C. Only a handful of
subsystems remain that require Perl:

  - gitweb, a read-only web interface.

  - A couple of scripts that allow importing repositories from GNU Arch,
    CVS and Subversion.

  - git-send-email(1), which can be used to send mails.

  - git-request-pull(1), which is used to request somebody to pull from
    a URL by sending an email.

  - git-filter-branch(1), which uses Perl with the `--state-branch`
    option. This command is typically recommended against nowadays in
    favor of git-filter-repo(1).

  - Our Perl bindings for Git.

  - The netrc Git credential helper.

None of these subsystems can really be considered to be part of the
"core" of Git, and an installation without them is fully functional.
It is more likely than not that an end user wouldn't even notice that
any features are missing if those tools weren't installed. But while
Perl nowadays very much is an optional dependency of Git, there is a
significant limitation when Perl isn't available: developers cannot run
our test suite.

Preceding commits have started to lift this restriction by removing the
strict dependency on Perl in many central parts of the test library. But
there are still many tests that rely on small Perl helpers to do various
different things.

Introduce a new PERL_TEST_HELPERS prerequisite that guards all tests
that require Perl. This prerequisite is explicitly different than the
preexisting PERL prerequisite:

  - PERL records whether or not features depending on the Perl
    interpreter are built.

  - PERL_TEST_HELPERS records whether or not a Perl interpreter is
    available for our tests.

By having these two separate prerequisites we can thus distinguish
between tests that inherently depend on Perl because the underlying
feature does, and those tests that depend on Perl because the test
itself is using Perl.

Adapt all tests to set the PERL_TEST_HELPERS prerequisite as needed.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2025-04-07 14:47:37 -07:00

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#!/bin/sh
test_description='test automatic tag following'
GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
. ./test-lib.sh
if ! test_have_prereq PERL_TEST_HELPERS
then
skip_all='skipping tagfollow tests; Perl not available'
test_done
fi
# End state of the repository:
#
# T - tag1 S - tag2
# / /
# L - A ------ O ------ B
# \ \ \
# \ C - origin/cat \
# origin/main main
test_expect_success setup '
test_tick &&
echo ichi >file &&
git add file &&
git commit -m L &&
L=$(git rev-parse --verify HEAD) &&
(
mkdir cloned &&
cd cloned &&
git init-db &&
git remote add -f origin ..
) &&
test_tick &&
echo A >file &&
git add file &&
git commit -m A &&
A=$(git rev-parse --verify HEAD)
'
U=UPLOAD_LOG
UPATH="$(pwd)/$U"
test_expect_success 'setup expect' '
cat - <<EOF >expect
want $A
EOF
'
get_needs () {
test -s "$1" &&
perl -alne '
next unless $F[1] eq "upload-pack<";
next unless $F[2] eq "want";
print $F[2], " ", $F[3];
' "$1"
}
test_expect_success 'fetch A (new commit : 1 connection)' '
rm -f $U &&
(
cd cloned &&
GIT_TRACE_PACKET=$UPATH git fetch &&
test $A = $(git rev-parse --verify origin/main)
) &&
get_needs $U >actual &&
test_cmp expect actual
'
test_expect_success "create tag T on A, create C on branch cat" '
git tag -a -m tag1 tag1 $A &&
T=$(git rev-parse --verify tag1) &&
git checkout -b cat &&
echo C >file &&
git add file &&
git commit -m C &&
C=$(git rev-parse --verify HEAD) &&
git checkout main
'
test_expect_success 'setup expect' '
cat - <<EOF >expect
want $C
want $T
EOF
'
test_expect_success 'fetch C, T (new branch, tag : 1 connection)' '
rm -f $U &&
(
cd cloned &&
GIT_TRACE_PACKET=$UPATH git fetch &&
test $C = $(git rev-parse --verify origin/cat) &&
test $T = $(git rev-parse --verify tag1) &&
test $A = $(git rev-parse --verify tag1^0)
) &&
get_needs $U >actual &&
test_cmp expect actual
'
test_expect_success "create commits O, B, tag S on B" '
test_tick &&
echo O >file &&
git add file &&
git commit -m O &&
test_tick &&
echo B >file &&
git add file &&
git commit -m B &&
B=$(git rev-parse --verify HEAD) &&
git tag -a -m tag2 tag2 $B &&
S=$(git rev-parse --verify tag2)
'
test_expect_success 'setup expect' '
cat - <<EOF >expect
want $B
want $S
EOF
'
test_expect_success 'fetch B, S (commit and tag : 1 connection)' '
rm -f $U &&
(
cd cloned &&
GIT_TRACE_PACKET=$UPATH git fetch &&
test $B = $(git rev-parse --verify origin/main) &&
test $B = $(git rev-parse --verify tag2^0) &&
test $S = $(git rev-parse --verify tag2)
) &&
get_needs $U >actual &&
test_cmp expect actual
'
test_expect_success 'setup expect' '
cat - <<EOF >expect
want $B
want $S
EOF
'
test_expect_success 'new clone fetch main and tags' '
test_might_fail git branch -D cat &&
rm -f $U &&
(
mkdir clone2 &&
cd clone2 &&
git init &&
git remote add origin .. &&
GIT_TRACE_PACKET=$UPATH git fetch &&
test $B = $(git rev-parse --verify origin/main) &&
test $S = $(git rev-parse --verify tag2) &&
test $B = $(git rev-parse --verify tag2^0) &&
test $T = $(git rev-parse --verify tag1) &&
test $A = $(git rev-parse --verify tag1^0)
) &&
get_needs $U >actual &&
test_cmp expect actual
'
test_expect_success 'fetch specific OID with tag following' '
git init --bare clone3.git &&
(
cd clone3.git &&
git remote add origin .. &&
git fetch origin $B:refs/heads/main &&
git -C .. for-each-ref >expect &&
git for-each-ref >actual &&
test_cmp expect actual
)
'
test_done