[PATCH] ui-snapshot: add support for lzip compression

[dev at open-music-kontrollers.ch (Hanspeter Portner)]

This patch adds support for lzip [1] compressed snapshots (*.tar.lz)

[1] https://www.nongnu.org/lzip/

Signed-off-by: Hanspeter Portner <dev at open-music-kontrollers.ch>
---
 cgitrc.5.txt            |  4 ++--
 tests/setup.sh          |  2 +-
 tests/t0107-snapshot.sh | 42 +++++++++++++++++++++++++++++++++++++++++
 ui-snapshot.c           |  7 +++++++
 4 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/cgitrc.5.txt b/cgitrc.5.txt
index ba77826..4ad3e64 100644
--- a/cgitrc.5.txt
+++ b/cgitrc.5.txt
@@ -407,8 +407,8 @@ side-by-side-diffs::
 snapshots::
 	Text which specifies the default set of snapshot formats that cgit
 	generates links for. The value is a space-separated list of zero or
-	more of the values "tar", "tar.gz", "tar.bz2", "tar.xz" and "zip".
-	The special value "all" enables all snapshot formats.
+	more of the values "tar", "tar.gz", "tar.bz2", "tar.xz", "tar.lz" and
+	"zip". The special value "all" enables all snapshot formats.
 	Default value: none.
 
 source-filter::
diff --git a/tests/setup.sh b/tests/setup.sh
index 7590f04..69e47e6 100755
--- a/tests/setup.sh
+++ b/tests/setup.sh
@@ -104,7 +104,7 @@ virtual-root=/
 cache-root=$PWD/cache
 
 cache-size=1021
-snapshots=tar.gz tar.bz zip
+snapshots=tar.gz tar.bz tar.lz zip
 enable-log-filecount=1
 enable-log-linecount=1
 summary-log=5
diff --git a/tests/t0107-snapshot.sh b/tests/t0107-snapshot.sh
index 6cf7aaa..a845ad9 100755
--- a/tests/t0107-snapshot.sh
+++ b/tests/t0107-snapshot.sh
@@ -38,6 +38,48 @@ test_expect_success 'verify untarred file-5' '
 	test_line_count = 1 master/file-5
 '
 
+if test -n "$(which lzip 2>/dev/null)"; then
+	test_set_prereq LZIP
+else
+	say 'Skipping LZIP validation tests: lzip not found'
+fi
+
+test_expect_success LZIP 'get foo/snapshot/master.tar.lz' '
+	cgit_url "foo/snapshot/master.tar.lz" >tmp
+'
+
+test_expect_success LZIP 'check html headers' '
+	head -n 1 tmp |
+	grep "Content-Type: application/x-lzip" &&
+
+	head -n 2 tmp |
+	grep "Content-Disposition: inline; filename=.master.tar.lz."
+'
+
+test_expect_success LZIP 'strip off the header lines' '
+	strip_headers <tmp >master.tar.lz
+'
+
+test_expect_success LZIP 'verify lzip format' '
+	lzip --test master.tar.lz &&
+	cp master.tar.lz /tmp/.
+'
+
+test_expect_success LZIP 'untar' '
+	rm -rf master &&
+	tar --lzip -xf master.tar.lz
+'
+
+test_expect_success LZIP 'count files' '
+	ls master/ >output &&
+	test_line_count = 5 output
+'
+
+test_expect_success LZIP 'verify untarred file-5' '
+	grep "^5$" master/file-5 &&
+	test_line_count = 1 master/file-5
+'
+
 test_expect_success 'get foo/snapshot/master.zip' '
 	cgit_url "foo/snapshot/master.zip" >tmp
 '
diff --git a/ui-snapshot.c b/ui-snapshot.c
index 9461d51..92cde42 100644
--- a/ui-snapshot.c
+++ b/ui-snapshot.c
@@ -79,6 +79,12 @@ static int write_tar_bzip2_archive(const char *hex, const char *prefix)
 	return write_compressed_tar_archive(hex, prefix, argv);
 }
 
+static int write_tar_lzip_archive(const char *hex, const char *prefix)
+{
+	char *argv[] = { "lzip", NULL };
+	return write_compressed_tar_archive(hex, prefix, argv);
+}
+
 static int write_tar_xz_archive(const char *hex, const char *prefix)
 {
 	char *argv[] = { "xz", NULL };
@@ -90,6 +96,7 @@ const struct cgit_snapshot_format cgit_snapshot_formats[] = {
 	{ ".tar",	"application/x-tar",	write_tar_archive	},
 	{ ".tar.gz",	"application/x-gzip",	write_tar_gzip_archive	},
 	{ ".tar.bz2",	"application/x-bzip2",	write_tar_bzip2_archive	},
+	{ ".tar.lz",	"application/x-lzip",	write_tar_lzip_archive	},
 	{ ".tar.xz",	"application/x-xz",	write_tar_xz_archive	},
 	{ ".zip",	"application/x-zip",	write_zip_archive	},
 	{ NULL }
-- 
2.22.1