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

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

Signed-off-by: Hanspeter Portner <[email protected]>
---
 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

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