coredump: make compression configurable

Add Compression={none,xz} and CompressionLevel=0-9 settings. Defaults
are xz/6.

Compression=filesystem may be added later.

I picked "xz" for the compression "type", since we might want to add
different compressors later on. XZ is fairly memory and CPU intensive, and
embedded users will likely want to use LZO or some other lightweight compression
mechanism.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/journal/compress.c b/src/journal/compress.c
index f36c430801..1fc62ead2a 100644
--- a/src/journal/compress.c
+++ b/src/journal/compress.c
@@ -203,7 +203,7 @@ fail:
         return b;
 }
 
-int compress_stream(int fdf, int fdt, off_t max_bytes) {
+int compress_stream(int fdf, int fdt, uint32_t preset, off_t max_bytes) {
         _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT;
         lzma_ret ret;
 
@@ -213,7 +213,7 @@ int compress_stream(int fdf, int fdt, off_t max_bytes) {
         assert(fdf >= 0);
         assert(fdt >= 0);
 
-        ret = lzma_easy_encoder(&s, LZMA_PRESET_DEFAULT, LZMA_CHECK_CRC64);
+        ret = lzma_easy_encoder(&s, preset, LZMA_CHECK_CRC64);
         if (ret != LZMA_OK) {
                 log_error("Failed to initialize XZ encoder: code %d", ret);
                 return -EINVAL;