#!/bin/sh

# The snapshot page hands a revision back as an archive. Every format is held
# byte for byte to the archive git itself writes, once decompressed where cgit
# pipes through a compressor, and each compressed format needs the same tool
# on the server and here, so one missing tool skips that format on both
# grounds at once. The tags after them check how a snapshot is named.

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

check_snapshot_headers() {
	sed "/^$/q" tmp >headers &&
	grep "^Status: 200 OK$" headers &&
	grep "^Content-Type: $2$" headers &&
	grep "^Content-Disposition: inline; filename=\"master.$1\"$" headers
}

check_snapshot_content() {
	ls master/ >output &&
	test_line_count = 5 output &&
	grep "^5$" master/file-5 &&
	test_line_count = 1 master/file-5
}

# Lists the members of the archive in the response held in tmp.
snapshot_members() {
	strip_headers <tmp >snapshot.tar &&
	tar -tf snapshot.tar >members
}

# The format checks below compare against these, which git's own writer makes
# from the commit the snapshots are taken of.
test_expect_success 'set up the archives git writes' '
	git -C repos/foo archive --format=tar --prefix=master/ master >expect.tar &&
	git -C repos/foo archive --format=zip --prefix=master/ master >expect.zip
'

test_expect_success 'a tar snapshot is the archive git writes' '
	cgit_ok_url "foo/snapshot/master.tar" >tmp &&
	check_snapshot_headers tar application/x-tar &&
	strip_headers <tmp >master.tar &&
	test_cmp_bin expect.tar master.tar &&
	rm -rf master &&
	tar -xf master.tar &&
	check_snapshot_content
'

# Registers the check for one compressed tar format.
test_tar_snapshot() {
	ext=$1
	type=$2
	tool=$3
	prereq=$4

	test_lazy_prereq $prereq "command -v $tool"

	test_expect_success $prereq "a $ext snapshot unpacks to the tar git writes" "
		cgit_ok_url 'foo/snapshot/master.$ext' >tmp &&
		check_snapshot_headers $ext $type &&
		strip_headers <tmp >master.$ext &&
		'$tool' -t 'master.$ext' &&
		'$tool' -dc 'master.$ext' >master.tar &&
		test_cmp_bin expect.tar master.tar
	"
}

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

test_expect_success 'a zip snapshot is the archive git writes' '
	cgit_ok_url "foo/snapshot/master.zip" >tmp &&
	check_snapshot_headers zip application/zip &&
	strip_headers <tmp >master.zip &&
	test_cmp_bin expect.zip master.zip
'

test_expect_success UNZIP 'a zip snapshot unzips' '
	cgit_ok_url "foo/snapshot/master.zip" >tmp &&
	strip_headers <tmp >master.zip &&
	rm -rf master &&
	"$GIT_UNZIP" master.zip &&
	check_snapshot_content
'

# 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 &&
	cgitrc_repo vtagsrc vtags snapshots=tar.gz
'

test_expect_success 'a loose v tag still sheds its v in the snapshot name' '
	cgit_rc vtagsrc "url=vtags/refs/" >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_rc vtagsrc "url=vtags/refs/" >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_rc vtagstarrc "url=vtags/snapshot/.tar" >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_rc noprefixrc "url=vtags/snapshot/vtags.tar&id=master" >tmp &&
	strip_headers <tmp >noprefix.tar &&
	tar -tf noprefix.tar >members &&
	grep "^file-1$" members &&
	! grep "^/" members
'

# A snapshot is named after the last component of the url once its .git
# suffix is gone, so a url of .git alone leaves the ref as the whole name.
test_expect_success 'set up repositories whose urls end in .git' '
	mkrepo repos/dotgit 1 &&
	git -C repos/dotgit tag v1.0 &&
	{
		echo "virtual-root=/" &&
		echo "cache-size=0" &&
		echo "snapshots=tar" &&
		echo "repo.url=.git" &&
		echo "repo.path=$PWD/repos/dotgit/.git" &&
		echo "repo.url=sub/.git" &&
		echo "repo.path=$PWD/repos/dotgit/.git"
	} >dotgitrc
'

test_expect_success 'a url of .git names a snapshot after the ref alone' '
	cgit_rc dotgitrc "url=.git/refs/" >tmp &&
	grep ">v1.0.tar<" tmp &&
	cgit_rc dotgitrc "url=.git/snapshot/v1.0.tar" >tmp &&
	strip_headers <tmp >dotgit.tar &&
	tar -tf dotgit.tar >members &&
	grep "^v1.0/file-1$" members
'

test_expect_success 'a url ending in /.git names a snapshot after its directory' '
	cgit_rc dotgitrc "url=sub/.git/refs/" >tmp &&
	grep ">sub-1.0.tar<" tmp
'

# 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' '
	cgitrc_copy 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 GZIP 'a snapshot name leads to the tag ahead of a branch' '
	git -C repos/vtags update-ref refs/heads/1.0 $(git -C repos/vtags commit-tree -m shadow HEAD^{tree}) &&
	cgit_rc vtagsrc "url=vtags/snapshot/vtags-1.0.tar.gz" >tmp &&
	strip_headers <tmp >tag.tar.gz &&
	test "$(gzip -dc tag.tar.gz | git -C repos/vtags get-tar-commit-id)" = "$(git -C repos/vtags rev-parse refs/tags/v1.0^{commit})"
'

# A signature is a note a pusher stored, held to max-blob-size like any blob.
test_expect_success 'a signature past max-blob-size is refused' '
	big=$(test_seq 1 2000 | git -C repos/vtags hash-object -w --stdin) &&
	git -C repos/vtags notes --ref signatures/tar.gz add -C $big v1.0 &&
	{
		echo "max-blob-size=1" &&
		cat vtagsrc
	} >sigrc &&
	cgit_rc sigrc "url=vtags/snapshot/vtags-1.0.tar.gz.asc" >tmp &&
	grep "^Status: 413" tmp
'

test_expect_success 'a snapshot and its signature are linked as one unit' '
	test_create_repo repos/signed &&
	(
		cd repos/signed &&
		echo one >file &&
		git add file &&
		git commit -m one &&
		git tag one &&
		sig=$(echo signature | git hash-object -w --stdin) &&
		git notes --ref signatures/tar.gz add -C $sig one
	) &&
	cgitrc_repo signedrc signed snapshots=tar.gz &&
	cgit_rc signedrc "url=signed/refs/" >tmp &&
	grep "<span class=.snapshot.><a href=./signed/snapshot/signed-one.tar.gz.>signed-one.tar.gz</a> (<a href=./signed/snapshot/signed-one.tar.gz.asc.>sig</a>)</span>" tmp
'

# A snapshot name is never worked back to a ref holding a slash, so such a
# ref is offered under a dashed name and passed along with it, even from a
# page whose own head is that ref.
test_expect_success 'a ref with a slash is linked under a dashed name' '
	git -C repos/vtags tag release/2.0 HEAD &&
	git -C repos/vtags branch topic/x HEAD &&
	cgit_rc vtagsrc "url=vtags/refs/" >tmp &&
	grep "<a href=./vtags/snapshot/vtags-release-2.0.tar.gz?id=release/2.0.>vtags-release-2.0.tar.gz</a>" tmp &&
	cgit_rc vtagsrc "url=vtags/commit/&h=topic/x" >tmp &&
	grep "<a href=./vtags/snapshot/vtags-topic-x.tar.gz?id=topic/x.>vtags-topic-x.tar.gz</a>" tmp
'

test_expect_success GZIP 'the dashed name serves the ref' '
	cgit_rc vtagsrc "url=vtags/snapshot/vtags-release-2.0.tar.gz&id=release/2.0" >tmp &&
	grep "^Status: 200" tmp &&
	strip_headers <tmp >slash.tar.gz &&
	test "$(gzip -dc slash.tar.gz | git -C repos/vtags get-tar-commit-id)" = "$(git -C repos/vtags rev-parse release/2.0^{commit})"
'

test_done