#!/bin/sh

test_description='signed commit tests'
. ./test-lib.sh
. "$TEST_DIRECTORY/lib-gpg.sh"

test_expect_success GPG 'create signed commits' '
        test_when_finished "test_unconfig commit.gpgsign" &&

        echo 1 >file && git add file &&
        test_tick && git commit -S -m initial &&
        git tag initial &&
        git branch side &&

        echo 2 >file && test_tick && git commit -a -S -m second &&
        git tag second &&

        git checkout side &&
        echo 3 >elif && git add elif &&
        test_tick && git commit -m "third on side" &&

        git checkout master &&
        test_tick && git merge -S side &&
        git tag merge &&

        echo 4 >file && test_tick && git commit -a -m "fourth unsigned" &&
        git tag fourth-unsigned &&

        test_tick && git commit --amend -S -m "fourth signed" &&
        git tag fourth-signed &&

        git config commit.gpgsign true &&
        echo 5 >file && test_tick && git commit -a -m "fifth signed" &&
        git tag fifth-signed &&

        git config commit.gpgsign false &&
        echo 6 >file && test_tick && git commit -a -m "sixth" &&
        git tag sixth-unsigned &&

        git config commit.gpgsign true &&
        echo 7 >file && test_tick && git commit -a -m "seventh" --no-gpg-sign &&
        git tag seventh-unsigned &&

        test_tick && git rebase -f HEAD^^ && git tag sixth-signed HEAD^ &&
        git tag seventh-signed

        echo 8 >file && test_tick && git commit -a -m eighth -SB7227189 &&
        git tag eighth-signed-alt
'

test_expect_success GPG 'verify and show signatures' '
        (
                for commit in initial second merge fourth-signed fifth-signed sixth-signed seventh-signed
                do
                        git verify-commit $commit &&
                        git show --pretty=short --show-signature $commit >actual &&
                        grep "Good signature from" actual &&
                        ! grep "BAD signature from" actual &&
                        echo $commit OK || exit 1
                done
        ) &&
        (
                for commit in merge^2 fourth-unsigned sixth-unsigned seventh-unsigned
                do
                        test_must_fail git verify-commit $commit &&
                        git show --pretty=short --show-signature $commit >actual &&
                        ! grep "Good signature from" actual &&
                        ! grep "BAD signature from" actual &&
                        echo $commit OK || exit 1
                done
        ) &&
        (
                for commit in eighth-signed-alt
                do
                        git show --pretty=short --show-signature $commit >actual &&
                        grep "Good signature from" actual &&
                        ! grep "BAD signature from" actual &&
                        grep "not certified" actual &&
                        echo $commit OK || exit 1
                done
        )
'

test_expect_success GPG 'show signed commit with signature' '
        git show -s initial >commit &&
        git show -s --show-signature initial >show &&
        git verify-commit -v initial >verify.1 2>verify.2 &&
        git cat-file commit initial >cat &&
        grep -v -e "gpg: " -e "Warning: " show >show.commit &&
        grep -e "gpg: " -e "Warning: " show >show.gpg &&
        grep -v "^ " cat | grep -v "^gpgsig " >cat.commit &&
        test_cmp show.commit commit &&
        test_cmp show.gpg verify.2 &&
        test_cmp cat.commit verify.1
'

test_expect_success GPG 'detect fudged signature' '
        git cat-file commit seventh-signed >raw &&

        sed -e "s/seventh/7th forged/" raw >forged1 &&
        git hash-object -w -t commit forged1 >forged1.commit &&
        ! git verify-commit $(cat forged1.commit) &&
        git show --pretty=short --show-signature $(cat forged1.commit) >actual1 &&
        grep "BAD signature from" actual1 &&
        ! grep "Good signature from" actual1
'

test_expect_success GPG 'detect fudged signature with NUL' '
        git cat-file commit seventh-signed >raw &&
        cat raw >forged2 &&
        echo Qwik | tr "Q" "\000" >>forged2 &&
        git hash-object -w -t commit forged2 >forged2.commit &&
        ! git verify-commit $(cat forged2.commit) &&
        git show --pretty=short --show-signature $(cat forged2.commit) >actual2 &&
        grep "BAD signature from" actual2 &&
        ! grep "Good signature from" actual2
'

test_expect_success GPG 'amending already signed commit' '
        git checkout fourth-signed^0 &&
        git commit --amend -S --no-edit &&
        git verify-commit HEAD &&
        git show -s --show-signature HEAD >actual &&
        grep "Good signature from" actual &&
        ! grep "BAD signature from" actual
'

test_expect_success GPG 'show good signature with custom format' '
        cat >expect <<-\EOF &&
        G
        13B6F51ECDDE430D
        C O Mitter <committer@example.com>
        EOF
        git log -1 --format="%G?%n%GK%n%GS" sixth-signed >actual &&
        test_cmp expect actual
'

test_expect_success GPG 'show bad signature with custom format' '
        cat >expect <<-\EOF &&
        B
        13B6F51ECDDE430D
        C O Mitter <committer@example.com>
        EOF
        git log -1 --format="%G?%n%GK%n%GS" $(cat forged1.commit) >actual &&
        test_cmp expect actual
'

test_expect_success GPG 'show unknown signature with custom format' '
        cat >expect <<-\EOF &&
        U
        61092E85B7227189
        Eris Discordia <discord@example.net>
        EOF
        git log -1 --format="%G?%n%GK%n%GS" eighth-signed-alt >actual &&
        test_cmp expect actual
'

test_expect_success GPG 'show lack of signature with custom format' '
        cat >expect <<-\EOF &&
        N


        EOF
        git log -1 --format="%G?%n%GK%n%GS" seventh-unsigned >actual &&
        test_cmp expect actual
'

test_done