ui-snapshot: add support for zstd compression

This patch adds support for zstd [0] compressed snapshots (*.tar.zst).
We enable multiple working threads (-T0), but keep default compression
level. The latter can be influenced by environment variable.

[0] https://www.zstd.net/

Signed-off-by: Christian Hesse <mail@eworm.de>

2 files changed, 43 insertions, 1 deletions

@@ -104,7 +104,7 @@ virtual-root=/
 cache-root=$PWD/cache
 
 cache-size=1021
-snapshots=tar.gz tar.bz tar.lz tar.xz zip
+snapshots=tar.gz tar.bz tar.lz tar.xz tar.zst zip
 enable-log-filecount=1
 enable-log-linecount=1
 summary-log=5
@@ -122,6 +122,48 @@ test_expect_success XZ 'verify untarred file-5' '
         test_line_count = 1 master/file-5
 '
 
+if test -n "$(which zstd 2>/dev/null)"; then
+        test_set_prereq ZSTD
+else
+        say 'Skipping ZSTD validation tests: zstd not found'
+fi
+
+test_expect_success ZSTD 'get foo/snapshot/master.tar.zst' '
+        cgit_url "foo/snapshot/master.tar.zst" >tmp
+'
+
+test_expect_success ZSTD 'check html headers' '
+        head -n 1 tmp |
+        grep "Content-Type: application/x-zstd" &&
+
+        head -n 2 tmp |
+        grep "Content-Disposition: inline; filename=.master.tar.zst."
+'
+
+test_expect_success ZSTD 'strip off the header lines' '
+        strip_headers <tmp >master.tar.zst
+'
+
+test_expect_success ZSTD 'verify zstd format' '
+        zstd --test master.tar.zst &&
+        cp master.tar.zst /tmp/.
+'
+
+test_expect_success ZSTD 'untar' '
+        rm -rf master &&
+        tar --zstd -xf master.tar.zst
+'
+
+test_expect_success ZSTD 'count files' '
+        ls master/ >output &&
+        test_line_count = 5 output
+'
+
+test_expect_success ZSTD 'verify untarred file-5' '
+        grep "^5$" 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
 '