import: support downloading bzip2-encoded images

This way, we can import CoreOS images unmodified.

5 files changed, 70 insertions, 6 deletions

diff --git a/Makefile.am b/Makefile.am
index 406910a3c2..4f536ee414 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -5250,6 +5250,7 @@ lib_LTLIBRARIES += \
 if HAVE_LIBCURL
 if HAVE_XZ
 if HAVE_ZLIB
+if HAVE_BZIP2
 if HAVE_GCRYPT
 
 bin_PROGRAMS += \
@@ -5290,6 +5291,7 @@ systemd_import_LDADD = \
 	$(LIBCURL_LIBS) \
 	$(XZ_LIBS) \
 	$(ZLIB_LIBS) \
+	-lbz2 \
 	$(GCRYPT_LIBS)
 
 manual_tests += \
@@ -5316,6 +5318,7 @@ endif
 endif
 endif
 endif
+endif
 
 endif
 
diff --git a/configure.ac b/configure.ac
index d82cfe890a..e0320057f4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -577,6 +577,16 @@ fi
 AM_CONDITIONAL(HAVE_ZLIB, [test "$have_zlib" = "yes"])
 
 # ------------------------------------------------------------------------------
+have_bzip2=no
+AC_ARG_ENABLE(bzip2, AS_HELP_STRING([--enable-bzip2], [Enable optional BZIP2 support]))
+AS_IF([test "x$enable_bzip2" != "xno"], [
+        AC_CHECK_HEADERS(bzlib.h,
+               [AC_DEFINE(HAVE_BZIP2, 1, [Define in BZIP2 is available]) have_bzip2=yes],
+               [AC_MSG_ERROR([*** BZIP2 support requested but headers not found])])
+])
+AM_CONDITIONAL(HAVE_BZIP2, [test "$have_bzip2" = "yes"])
+
+# ------------------------------------------------------------------------------
 have_lz4=no
 AC_ARG_ENABLE(lz4, AS_HELP_STRING([--enable-lz4], [Enable optional LZ4 support]))
 AS_IF([test "x$enable_lz4" = "xyes"], [
@@ -1426,6 +1436,7 @@ AC_MSG_RESULT([
         ZLIB:                    ${have_zlib}
         XZ:                      ${have_xz}
         LZ4:                     ${have_lz4}
+        BZIP2:                   ${have_bzip2}
         ACL:                     ${have_acl}
         GCRYPT:                  ${have_gcrypt}
         QRENCODE:                ${have_qrencode}
diff --git a/src/import/import-job.c b/src/import/import-job.c
index 322aa1a18c..337a5c5a22 100644
--- a/src/import/import-job.c
+++ b/src/import/import-job.c
@@ -37,6 +37,8 @@ ImportJob* import_job_unref(ImportJob *j) {
                 lzma_end(&j->xz);
         else if (j->compressed == IMPORT_JOB_GZIP)
                 inflateEnd(&j->gzip);
+        else if (j->compressed == IMPORT_JOB_BZIP2)
+                BZ2_bzDecompressEnd(&j->bzip2);
 
         if (j->checksum_context)
                 gcry_md_close(j->checksum_context);
@@ -178,7 +180,9 @@ static int import_job_write_uncompressed(ImportJob *j, void *p, size_t sz) {
 
         assert(j);
         assert(p);
-        assert(sz > 0);
+
+        if (sz <= 0)
+                return 0;
 
         if (j->written_uncompressed + sz < j->written_uncompressed) {
                 log_error("File too large, overflow");
@@ -209,7 +213,7 @@ static int import_job_write_uncompressed(ImportJob *j, void *p, size_t sz) {
                 if (!GREEDY_REALLOC(j->payload, j->payload_allocated, j->payload_size + sz))
                         return log_oom();
 
-                memcpy((uint8_t*) j->payload + j->payload_size, p, sz);
+                memcpy(j->payload + j->payload_size, p, sz);
                 j->payload_size += sz;
         }
 
@@ -223,7 +227,9 @@ static int import_job_write_compressed(ImportJob *j, void *p, size_t sz) {
 
         assert(j);
         assert(p);
-        assert(sz > 0);
+
+        if (sz <= 0)
+                return 0;
 
         if (j->written_compressed + sz < j->written_compressed) {
                 log_error("File too large, overflow");
@@ -300,6 +306,29 @@ static int import_job_write_compressed(ImportJob *j, void *p, size_t sz) {
 
                 break;
 
+        case IMPORT_JOB_BZIP2:
+                j->bzip2.next_in = p;
+                j->bzip2.avail_in = sz;
+
+                while (j->bzip2.avail_in > 0) {
+                        uint8_t buffer[16 * 1024];
+
+                        j->bzip2.next_out = (char*) buffer;
+                        j->bzip2.avail_out = sizeof(buffer);
+
+                        r = BZ2_bzDecompress(&j->bzip2);
+                        if (r != BZ_OK && r != BZ_STREAM_END) {
+                                log_error("Decompression error.");
+                                return -EIO;
+                        }
+
+                        r = import_job_write_uncompressed(j,  buffer, sizeof(buffer) - j->bzip2.avail_out);
+                        if (r < 0)
+                                return r;
+                }
+
+                break;
+
         default:
                 assert_not_reached("Unknown compression");
         }
@@ -350,6 +379,9 @@ static int import_job_detect_compression(ImportJob *j) {
         static const uint8_t gzip_signature[] = {
                 0x1f, 0x8b
         };
+        static const uint8_t bzip2_signature[] = {
+                'B', 'Z', 'h'
+        };
 
         _cleanup_free_ uint8_t *stub = NULL;
         size_t stub_size;
@@ -358,18 +390,23 @@ static int import_job_detect_compression(ImportJob *j) {
 
         assert(j);
 
-        if (j->payload_size < MAX(sizeof(xz_signature), sizeof(gzip_signature)))
+        if (j->payload_size < MAX3(sizeof(xz_signature),
+                                   sizeof(gzip_signature),
+                                   sizeof(bzip2_signature)))
                 return 0;
 
         if (memcmp(j->payload, xz_signature, sizeof(xz_signature)) == 0)
                 j->compressed = IMPORT_JOB_XZ;
         else if (memcmp(j->payload, gzip_signature, sizeof(gzip_signature)) == 0)
                 j->compressed = IMPORT_JOB_GZIP;
+        else if (memcmp(j->payload, bzip2_signature, sizeof(bzip2_signature)) == 0)
+                j->compressed = IMPORT_JOB_BZIP2;
         else
                 j->compressed = IMPORT_JOB_UNCOMPRESSED;
 
         log_debug("Stream is XZ compressed: %s", yes_no(j->compressed == IMPORT_JOB_XZ));
         log_debug("Stream is GZIP compressed: %s", yes_no(j->compressed == IMPORT_JOB_GZIP));
+        log_debug("Stream is BZIP2 compressed: %s", yes_no(j->compressed == IMPORT_JOB_BZIP2));
 
         if (j->compressed == IMPORT_JOB_XZ) {
                 lzma_ret xzr;
@@ -387,6 +424,13 @@ static int import_job_detect_compression(ImportJob *j) {
                         return -EIO;
                 }
         }
+        if (j->compressed == IMPORT_JOB_BZIP2) {
+                r = BZ2_bzDecompressInit(&j->bzip2, 0, 0);
+                if (r != BZ_OK) {
+                        log_error("Failed to initialize bzip2 decoder.");
+                        return -EIO;
+                }
+        }
 
         r = import_job_open_disk(j);
         if (r < 0)
@@ -427,7 +471,7 @@ static size_t import_job_write_callback(void *contents, size_t size, size_t nmem
                         goto fail;
                 }
 
-                memcpy((uint8_t*) j->payload + j->payload_size, contents, sz);
+                memcpy(j->payload + j->payload_size, contents, sz);
                 j->payload_size += sz;
 
                 r = import_job_detect_compression(j);
diff --git a/src/import/import-job.h b/src/import/import-job.h
index a9b58e6339..b10b0ec0d9 100644
--- a/src/import/import-job.h
+++ b/src/import/import-job.h
@@ -23,6 +23,7 @@
 
 #include <lzma.h>
 #include <zlib.h>
+#include <bzlib.h>
 #include <gcrypt.h>
 
 #include "macro.h"
@@ -49,6 +50,7 @@ typedef enum ImportJobCompression {
         IMPORT_JOB_UNCOMPRESSED,
         IMPORT_JOB_XZ,
         IMPORT_JOB_GZIP,
+        IMPORT_JOB_BZIP2,
         _IMPORT_JOB_COMPRESSION_MAX,
         _IMPORT_JOB_COMPRESSION_INVALID = -1,
 } ImportJobCompression;
@@ -89,6 +91,7 @@ struct ImportJob {
         ImportJobCompression compressed;
         lzma_stream xz;
         z_stream gzip;
+        bz_stream bzip2;
 
         unsigned progress_percent;
         usec_t start_usec;
diff --git a/src/import/import.c b/src/import/import.c
index 0c215c6484..b3ebb35357 100644
--- a/src/import/import.c
+++ b/src/import/import.c
@@ -52,9 +52,11 @@ static int strip_tar_suffixes(const char *name, char **ret) {
 
         e = endswith(name, ".tar");
         if (!e)
+                e = endswith(name, ".tar.xz");
+        if (!e)
                 e = endswith(name, ".tar.gz");
         if (!e)
-                e = endswith(name, ".tar.xz");
+                e = endswith(name, ".tar.bz2");
         if (!e)
                 e = endswith(name, ".tgz");
         if (!e)
@@ -162,6 +164,7 @@ static int strip_raw_suffixes(const char *p, char **ret) {
         static const char suffixes[] =
                 ".xz\0"
                 ".gz\0"
+                ".bz2\0"
                 ".raw\0"
                 ".qcow2\0"
                 ".img\0"