#!/bin/sh

test_description='fetch/clone from a shallow clone'

. ./test-lib.sh

commit() {
        echo "$1" >tracked &&
        git add tracked &&
        git commit -m "$1"
}

test_expect_success 'setup' '
        commit 1 &&
        commit 2 &&
        commit 3 &&
        commit 4 &&
        git config --global transfer.fsckObjects true
'

test_expect_success 'setup shallow clone' '
        git clone --no-local --depth=2 .git shallow &&
        git --git-dir=shallow/.git log --format=%s >actual &&
        cat <<EOF >expect &&
4
3
EOF
        test_cmp expect actual
'

test_expect_success 'clone from shallow clone' '
        git clone --no-local shallow shallow2 &&
        (
        cd shallow2 &&
        git fsck &&
        git log --format=%s >actual &&
        cat <<EOF >expect &&
4
3
EOF
        test_cmp expect actual
        )
'

test_expect_success 'fetch from shallow clone' '
        (
        cd shallow &&
        commit 5
        ) &&
        (
        cd shallow2 &&
        git fetch &&
        git fsck &&
        git log --format=%s origin/master >actual &&
        cat <<EOF >expect &&
5
4
3
EOF
        test_cmp expect actual
        )
'

test_expect_success 'fetch --depth from shallow clone' '
        (
        cd shallow &&
        commit 6
        ) &&
        (
        cd shallow2 &&
        git fetch --depth=2 &&
        git fsck &&
        git log --format=%s origin/master >actual &&
        cat <<EOF >expect &&
6
5
EOF
        test_cmp expect actual
        )
'

test_expect_success 'fetch --unshallow from shallow clone' '
        (
        cd shallow2 &&
        git fetch --unshallow &&
        git fsck &&
        git log --format=%s origin/master >actual &&
        cat <<EOF >expect &&
6
5
4
3
EOF
        test_cmp expect actual
        )
'

test_expect_success 'fetch something upstream has but hidden by clients shallow boundaries' '
        # the blob "1" is available in .git but hidden by the
        # shallow2/.git/shallow and it should be resent
        ! git --git-dir=shallow2/.git cat-file blob $(echo 1|git hash-object --stdin) >/dev/null &&
        echo 1 >1.t &&
        git add 1.t &&
        git commit -m add-1-back &&
        (
        cd shallow2 &&
        git fetch ../.git +refs/heads/master:refs/remotes/top/master &&
        git fsck &&
        git log --format=%s top/master >actual &&
        cat <<EOF >expect &&
add-1-back
4
3
EOF
        test_cmp expect actual
        ) &&
        git --git-dir=shallow2/.git cat-file blob $(echo 1|git hash-object --stdin) >/dev/null

'

test_expect_success 'fetch that requires changes in .git/shallow is filtered' '
        (
        cd shallow &&
        git checkout --orphan no-shallow &&
        commit no-shallow
        ) &&
        git init notshallow &&
        (
        cd notshallow &&
        git fetch ../shallow/.git refs/heads/*:refs/remotes/shallow/*&&
        git for-each-ref --format="%(refname)" >actual.refs &&
        cat <<EOF >expect.refs &&
refs/remotes/shallow/no-shallow
EOF
        test_cmp expect.refs actual.refs &&
        git log --format=%s shallow/no-shallow >actual &&
        cat <<EOF >expect &&
no-shallow
EOF
        test_cmp expect actual
        )
'

test_expect_success 'fetch --update-shallow' '
        (
        cd shallow &&
        git checkout master &&
        commit 7 &&
        git tag -m foo heavy-tag HEAD^ &&
        git tag light-tag HEAD^:tracked
        ) &&
        (
        cd notshallow &&
        git fetch --update-shallow ../shallow/.git refs/heads/*:refs/remotes/shallow/* &&
        git fsck &&
        git for-each-ref --sort=refname --format="%(refname)" >actual.refs &&
        cat <<EOF >expect.refs &&
refs/remotes/shallow/master
refs/remotes/shallow/no-shallow
refs/tags/heavy-tag
refs/tags/light-tag
EOF
        test_cmp expect.refs actual.refs &&
        git log --format=%s shallow/master >actual &&
        cat <<EOF >expect &&
7
6
5
4
3
EOF
        test_cmp expect actual
        )
'

test_expect_success POSIXPERM,SANITY 'shallow fetch from a read-only repo' '
        cp -R .git read-only.git &&
        test_when_finished "find read-only.git -type d -print | xargs chmod +w" &&
        find read-only.git -print | xargs chmod -w &&
        git clone --no-local --depth=2 read-only.git from-read-only &&
        git --git-dir=from-read-only/.git log --format=%s >actual &&
        cat >expect <<EOF &&
add-1-back
4
EOF
        test_cmp expect actual
'

. "$TEST_DIRECTORY"/lib-httpd.sh
start_httpd

REPO="$HTTPD_DOCUMENT_ROOT_PATH/repo"

test_expect_success 'shallow fetches check connectivity before writing shallow file' '
        rm -rf "$REPO" client &&

        git init "$REPO" &&
        test_commit -C "$REPO" one &&
        test_commit -C "$REPO" two &&
        test_commit -C "$REPO" three &&

        git init client &&

        # Use protocol v2 to ensure that shallow information is sent exactly
        # once by the server, since we are planning to manipulate it.
        git -C "$REPO" config protocol.version 2 &&
        git -C client config protocol.version 2 &&

        git -C client fetch --depth=2 "$HTTPD_URL/one_time_sed/repo" master:a_branch &&

        # Craft a situation in which the server sends back an unshallow request
        # with an empty packfile. This is done by refetching with a shorter
        # depth (to ensure that the packfile is empty), and overwriting the
        # shallow line in the response with the unshallow line we want.
        printf "s/0034shallow %s/0036unshallow %s/" \
               "$(git -C "$REPO" rev-parse HEAD)" \
               "$(git -C "$REPO" rev-parse HEAD^)" \
               >"$HTTPD_ROOT_PATH/one-time-sed" &&
        test_must_fail git -C client fetch --depth=1 "$HTTPD_URL/one_time_sed/repo" \
                master:a_branch &&

        # Ensure that the one-time-sed script was used.
        ! test -e "$HTTPD_ROOT_PATH/one-time-sed" &&

        # Ensure that the resulting repo is consistent, despite our failure to
        # fetch.
        git -C client fsck
'

stop_httpd

test_done