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vcs-svn: Error out for v3 dumps

By ignoring the Text-Delta and Prop-Delta node fields, current svn-fe
happily mistakes deltas for full text and instead of cleanly erroring
out, it produces a valid but semantically bogus fast-import stream
when fed a dump file in the modern "svnadmin dump --deltas" format.

Dump file parsers are supposed to ignore header fields they don't
understand (to allow for backward-compatible extensions), but they are
also supposed to check the SVN-fs-dump-format-version header to
prevent misinterpretation of non backward-compatible extensions.
Do so.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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1 parent ff62d71 commit 7b142d276fec06ab9c1df6c53fbfdbf5424485e5 @jrn jrn committed with gitster Nov 18, 2010
Showing with 10 additions and 3 deletions.
  1. +10 −3 svndump.c
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@@ -51,14 +51,14 @@ static struct {
} rev_ctx;
static struct {
- uint32_t uuid, url;
+ uint32_t version, uuid, url;
} dump_ctx;
static struct {
uint32_t svn_log, svn_author, svn_date, svn_executable, svn_special, uuid,
revision_number, node_path, node_kind, node_action,
node_copyfrom_path, node_copyfrom_rev, text_content_length,
- prop_content_length, content_length;
+ prop_content_length, content_length, svn_fs_dump_format_version;
} keys;
static void reset_node_ctx(char *fname)
@@ -85,6 +85,7 @@ static void reset_rev_ctx(uint32_t revision)
static void reset_dump_ctx(uint32_t url)
{
dump_ctx.url = url;
+ dump_ctx.version = 1;
dump_ctx.uuid = ~0;
}
@@ -105,6 +106,7 @@ static void init_keys(void)
keys.text_content_length = pool_intern("Text-content-length");
keys.prop_content_length = pool_intern("Prop-content-length");
keys.content_length = pool_intern("Content-length");
+ keys.svn_fs_dump_format_version = pool_intern("SVN-fs-dump-format-version");
}
static void read_props(void)
@@ -206,7 +208,12 @@ void svndump_read(const char *url)
*val++ = '\0';
key = pool_intern(t);
- if (key == keys.uuid) {
+ if (key == keys.svn_fs_dump_format_version) {
+ dump_ctx.version = atoi(val);
+ if (dump_ctx.version > 2)
+ die("expected svn dump format version <= 2, found %d",
+ dump_ctx.version);
+ } else if (key == keys.uuid) {
dump_ctx.uuid = pool_intern(val);
} else if (key == keys.revision_number) {
if (active_ctx == NODE_CTX)

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