#!/bin/sh

# The snapshot page hands a branch back as an archive. One function below
# registers the same checks for every tar based format, and each format
# needs the same compressor cgit pipes through on the server, so one missing
# tool skips that format on both grounds at once. zip follows at the end,
# since unzip shares no flags with the rest.

test_description='Verify snapshot'
. ./setup.sh

# Registers the checks for one tar based format. Takes the archive suffix,
# the content type the response must carry, the compressor to unpack with and
# the name of the prerequisite guarding the checks.
test_tar_snapshot() {
	ext=$1
	type=$2
	tool=$3
	prereq=$4

	if command -v "$tool" >/dev/null 2>&1
	then
		test_set_prereq $prereq
	else
		say "Skipping $ext validation tests: $tool not found"
	fi

	test_expect_success $prereq "get foo/snapshot/master.$ext" "
		cgit_url 'foo/snapshot/master.$ext' >tmp
	"

	test_expect_success $prereq "check $ext response headers" "
		head -n 1 tmp | grep 'Status: 200 OK' &&
		head -n 2 tmp | grep '^Content-Type: $type\$' &&
		head -n 3 tmp | grep 'Content-Disposition: inline; filename=.master.$ext.'
	"

	test_expect_success $prereq "verify $ext format" "
		strip_headers <tmp >master.$ext &&
		'$tool' -t 'master.$ext'
	"

	test_expect_success $prereq "untar $ext and verify the content" "
		rm -rf master &&
		'$tool' -dc 'master.$ext' | tar -xf - &&
		ls master/ >output &&
		test_line_count = 5 output &&
		grep '^5\$' master/file-5 &&
		test_line_count = 1 master/file-5
	"
}

# The uncompressed tar comes straight out of git's archive writer, so tar
# itself both proves the format and unpacks it.
test_expect_success 'get foo/snapshot/master.tar' '
	cgit_url "foo/snapshot/master.tar" >tmp
'

test_expect_success 'check tar response headers' '
	head -n 1 tmp | grep "Status: 200 OK" &&
	head -n 2 tmp | grep "^Content-Type: application/x-tar$" &&
	head -n 3 tmp | grep "Content-Disposition: inline; filename=.master.tar."
'

test_expect_success 'untar and verify the content' '
	strip_headers <tmp >master.tar &&
	rm -rf master &&
	tar -xf master.tar &&
	ls master/ >output &&
	test_line_count = 5 output &&
	grep "^5$" master/file-5 &&
	test_line_count = 1 master/file-5
'

test_tar_snapshot tar.gz  application/gzip    gzip  GZIP
test_tar_snapshot tar.bz2 application/x-bzip2 bzip2 BZIP2
test_tar_snapshot tar.lz  application/x-lzip  lzip  LZIP
test_tar_snapshot tar.xz  application/x-xz    xz    XZ
test_tar_snapshot tar.zst application/zstd    zstd  ZSTD

if command -v unzip >/dev/null 2>&1
then
	test_set_prereq UNZIP
else
	say 'Skipping zip validation tests: unzip not found'
fi

test_expect_success 'get foo/snapshot/master.zip' '
	cgit_url "foo/snapshot/master.zip" >tmp
'

test_expect_success 'check zip response headers' '
	head -n 1 tmp | grep "Status: 200 OK" &&
	head -n 2 tmp | grep "^Content-Type: application/zip$" &&
	head -n 3 tmp | grep "Content-Disposition: inline; filename=.master.zip."
'

test_expect_success 'strip off the header lines' '
	strip_headers <tmp >master.zip
'

test_expect_success UNZIP 'verify zip format' '
	unzip -t master.zip
'

test_expect_success UNZIP 'unzip and verify the content' '
	rm -rf master &&
	unzip master.zip &&
	ls master/ >output &&
	test_line_count = 5 output &&
	grep "^5$" master/file-5 &&
	test_line_count = 1 master/file-5
'

# A tag named v1.0 sheds its v in the snapshot name unless dropping it would
# merge two tags. The first tag below stays a loose ref on purpose, because on
# a case-insensitive filesystem a ref lookup for V1.0 finds the loose v1.0
# file, and deciding by lookups called every fresh tag ambiguous and kept its
# v until git happened to pack the refs.
test_expect_success 'set up a repo with a versioned tag' '
	mkrepo repos/vtags 2 &&
	git -C repos/vtags update-ref refs/tags/v1.0 HEAD &&
	{
		echo "virtual-root=/" &&
		echo "cache-size=0" &&
		echo "snapshots=tar.gz" &&
		echo "repo.url=vtags" &&
		echo "repo.path=$PWD/repos/vtags/.git"
	} >vtagsrc
'

test_expect_success 'a loose v tag still sheds its v in the snapshot name' '
	CGIT_CONFIG="$PWD/vtagsrc" QUERY_STRING="url=vtags/refs/" cgit >tmp &&
	grep "vtags-1.0.tar.gz" tmp &&
	! grep "vtags-v1.0.tar.gz" tmp
'

# The second tag goes in only after the first is packed, since two loose files
# differing in case alone cannot coexist on a case-insensitive filesystem.
test_expect_success 'a real case collision keeps the v on both tags' '
	git -C repos/vtags pack-refs --all &&
	git -C repos/vtags update-ref refs/tags/V1.0 HEAD~1 &&
	CGIT_CONFIG="$PWD/vtagsrc" QUERY_STRING="url=vtags/refs/" cgit >tmp &&
	grep "vtags-v1.0.tar.gz" tmp &&
	grep "vtags-V1.0.tar.gz" tmp &&
	! grep "vtags-1.0.tar.gz" tmp
'

# A name that is all suffix names no revision, and an empty snapshot-prefix
# gives the members no leading directory rather than a leading slash.
test_expect_success 'a snapshot name with nothing before its suffix is refused' '
	git -C repos/vtags branch v HEAD &&
	sed "s/^snapshots=tar.gz$/snapshots=tar/" vtagsrc >vtagstarrc &&
	CGIT_CONFIG="$PWD/vtagstarrc" QUERY_STRING="url=vtags/snapshot/.tar" cgit >tmp &&
	grep "^Status: 404" tmp
'

test_expect_success 'an empty snapshot-prefix puts no slash ahead of the members' '
	{
		cat vtagstarrc &&
		echo "repo.snapshot-prefix="
	} >noprefixrc &&
	CGIT_CONFIG="$PWD/noprefixrc" QUERY_STRING="url=vtags/snapshot/vtags.tar&id=master" cgit >tmp &&
	strip_headers <tmp >noprefix.tar &&
	tar -tf noprefix.tar >members &&
	grep "^file-1$" members &&
	! grep "^/" members
'

# A server may run cgit with no PATH at all, and the compressor is then looked
# for on the default path execvp searches.
test_expect_success GZIP 'a compressed snapshot is made without a PATH' '
	sed "s/^cache-size=.*/cache-size=0/" cgitrc >nopathrc &&
	cgit_bin=$(command -v cgit) &&
	(
		unset PATH &&
		CGIT_CONFIG="$PWD/nopathrc" QUERY_STRING="url=foo/snapshot/master.tar.gz" "$cgit_bin" >tmp
	) &&
	grep "^Status: 200" tmp &&
	strip_headers <tmp >nopath.tar.gz &&
	gzip -t nopath.tar.gz
'

# A link offers the snapshot of a tag, and the name on it has to lead back to
# that tag even when a branch is spelled like the tag's stem.
test_expect_success 'a snapshot name leads to the tag ahead of a branch' '
	git -C repos/vtags update-ref refs/heads/1.0 $(git -C repos/vtags commit-tree -m shadow HEAD^{tree}) &&
	CGIT_CONFIG="$PWD/vtagsrc" QUERY_STRING="url=vtags/snapshot/vtags-1.0.tar.gz" cgit >tmp &&
	strip_headers <tmp >tag.tar.gz &&
	test "$(gzip -dc tag.tar.gz | git -C repos/vtags get-tar-commit-id)" = "$(git -C repos/vtags rev-parse refs/tags/v1.0^{commit})"
'

test_done