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-rw-r--r--vcs-svn/svndump.c454
1 files changed, 454 insertions, 0 deletions
diff --git a/vcs-svn/svndump.c b/vcs-svn/svndump.c
new file mode 100644
index 0000000000..bc792223b2
--- /dev/null
+++ b/vcs-svn/svndump.c
@@ -0,0 +1,454 @@
+/*
+ * Parse and rearrange a svnadmin dump.
+ * Create the dump with:
+ * svnadmin dump --incremental -r<startrev>:<endrev> <repository> >outfile
+ *
+ * Licensed under a two-clause BSD-style license.
+ * See LICENSE for details.
+ */
+
+#include "cache.h"
+#include "repo_tree.h"
+#include "fast_export.h"
+#include "line_buffer.h"
+#include "string_pool.h"
+#include "strbuf.h"
+#include "svndump.h"
+
+/*
+ * Compare start of string to literal of equal length;
+ * must be guarded by length test.
+ */
+#define constcmp(s, ref) memcmp(s, ref, sizeof(ref) - 1)
+
+#define NODEACT_REPLACE 4
+#define NODEACT_DELETE 3
+#define NODEACT_ADD 2
+#define NODEACT_CHANGE 1
+#define NODEACT_UNKNOWN 0
+
+#define DUMP_CTX 0
+#define REV_CTX 1
+#define NODE_CTX 2
+
+#define LENGTH_UNKNOWN (~0)
+#define DATE_RFC2822_LEN 31
+
+static struct line_buffer input = LINE_BUFFER_INIT;
+
+static struct {
+ uint32_t action, propLength, textLength, srcRev, type;
+ uint32_t src[REPO_MAX_PATH_DEPTH], dst[REPO_MAX_PATH_DEPTH];
+ uint32_t text_delta, prop_delta;
+} node_ctx;
+
+static struct {
+ uint32_t revision;
+ unsigned long timestamp;
+ struct strbuf log, author;
+} rev_ctx;
+
+static struct {
+ uint32_t version;
+ struct strbuf uuid, url;
+} dump_ctx;
+
+static void reset_node_ctx(char *fname)
+{
+ node_ctx.type = 0;
+ node_ctx.action = NODEACT_UNKNOWN;
+ node_ctx.propLength = LENGTH_UNKNOWN;
+ node_ctx.textLength = LENGTH_UNKNOWN;
+ node_ctx.src[0] = ~0;
+ node_ctx.srcRev = 0;
+ pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.dst, "/", fname);
+ node_ctx.text_delta = 0;
+ node_ctx.prop_delta = 0;
+}
+
+static void reset_rev_ctx(uint32_t revision)
+{
+ rev_ctx.revision = revision;
+ rev_ctx.timestamp = 0;
+ strbuf_reset(&rev_ctx.log);
+ strbuf_reset(&rev_ctx.author);
+}
+
+static void reset_dump_ctx(const char *url)
+{
+ strbuf_reset(&dump_ctx.url);
+ if (url)
+ strbuf_addstr(&dump_ctx.url, url);
+ dump_ctx.version = 1;
+ strbuf_reset(&dump_ctx.uuid);
+}
+
+static void handle_property(const struct strbuf *key_buf,
+ struct strbuf *val,
+ uint32_t *type_set)
+{
+ const char *key = key_buf->buf;
+ size_t keylen = key_buf->len;
+
+ switch (keylen + 1) {
+ case sizeof("svn:log"):
+ if (constcmp(key, "svn:log"))
+ break;
+ if (!val)
+ die("invalid dump: unsets svn:log");
+ strbuf_swap(&rev_ctx.log, val);
+ break;
+ case sizeof("svn:author"):
+ if (constcmp(key, "svn:author"))
+ break;
+ if (!val)
+ strbuf_reset(&rev_ctx.author);
+ else
+ strbuf_swap(&rev_ctx.author, val);
+ break;
+ case sizeof("svn:date"):
+ if (constcmp(key, "svn:date"))
+ break;
+ if (!val)
+ die("invalid dump: unsets svn:date");
+ if (parse_date_basic(val->buf, &rev_ctx.timestamp, NULL))
+ warning("invalid timestamp: %s", val->buf);
+ break;
+ case sizeof("svn:executable"):
+ case sizeof("svn:special"):
+ if (keylen == strlen("svn:executable") &&
+ constcmp(key, "svn:executable"))
+ break;
+ if (keylen == strlen("svn:special") &&
+ constcmp(key, "svn:special"))
+ break;
+ if (*type_set) {
+ if (!val)
+ return;
+ die("invalid dump: sets type twice");
+ }
+ if (!val) {
+ node_ctx.type = REPO_MODE_BLB;
+ return;
+ }
+ *type_set = 1;
+ node_ctx.type = keylen == strlen("svn:executable") ?
+ REPO_MODE_EXE :
+ REPO_MODE_LNK;
+ }
+}
+
+static void die_short_read(void)
+{
+ if (buffer_ferror(&input))
+ die_errno("error reading dump file");
+ die("invalid dump: unexpected end of file");
+}
+
+static void read_props(void)
+{
+ static struct strbuf key = STRBUF_INIT;
+ static struct strbuf val = STRBUF_INIT;
+ const char *t;
+ /*
+ * NEEDSWORK: to support simple mode changes like
+ * K 11
+ * svn:special
+ * V 1
+ * *
+ * D 14
+ * svn:executable
+ * we keep track of whether a mode has been set and reset to
+ * plain file only if not. We should be keeping track of the
+ * symlink and executable bits separately instead.
+ */
+ uint32_t type_set = 0;
+ while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
+ uint32_t len;
+ const char type = t[0];
+ int ch;
+
+ if (!type || t[1] != ' ')
+ die("invalid property line: %s\n", t);
+ len = atoi(&t[2]);
+ strbuf_reset(&val);
+ buffer_read_binary(&input, &val, len);
+ if (val.len < len)
+ die_short_read();
+
+ /* Discard trailing newline. */
+ ch = buffer_read_char(&input);
+ if (ch == EOF)
+ die_short_read();
+ if (ch != '\n')
+ die("invalid dump: expected newline after %s", val.buf);
+
+ switch (type) {
+ case 'K':
+ strbuf_swap(&key, &val);
+ continue;
+ case 'D':
+ handle_property(&val, NULL, &type_set);
+ continue;
+ case 'V':
+ handle_property(&key, &val, &type_set);
+ strbuf_reset(&key);
+ continue;
+ default:
+ die("invalid property line: %s\n", t);
+ }
+ }
+}
+
+static void handle_node(void)
+{
+ uint32_t mark = 0;
+ const uint32_t type = node_ctx.type;
+ const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
+ const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
+
+ if (node_ctx.text_delta)
+ die("text deltas not supported");
+ if (have_text)
+ mark = next_blob_mark();
+ if (node_ctx.action == NODEACT_DELETE) {
+ if (have_text || have_props || node_ctx.srcRev)
+ die("invalid dump: deletion node has "
+ "copyfrom info, text, or properties");
+ repo_delete(node_ctx.dst);
+ return;
+ }
+ if (node_ctx.action == NODEACT_REPLACE) {
+ repo_delete(node_ctx.dst);
+ node_ctx.action = NODEACT_ADD;
+ }
+ if (node_ctx.srcRev) {
+ repo_copy(node_ctx.srcRev, node_ctx.src, node_ctx.dst);
+ if (node_ctx.action == NODEACT_ADD)
+ node_ctx.action = NODEACT_CHANGE;
+ }
+ if (have_text && type == REPO_MODE_DIR)
+ die("invalid dump: directories cannot have text attached");
+
+ /*
+ * Decide on the new content (mark) and mode (node_ctx.type).
+ */
+ if (node_ctx.action == NODEACT_CHANGE && !~*node_ctx.dst) {
+ if (type != REPO_MODE_DIR)
+ die("invalid dump: root of tree is not a regular file");
+ } else if (node_ctx.action == NODEACT_CHANGE) {
+ uint32_t mode;
+ if (!have_text)
+ mark = repo_read_path(node_ctx.dst);
+ mode = repo_read_mode(node_ctx.dst);
+ if (mode == REPO_MODE_DIR && type != REPO_MODE_DIR)
+ die("invalid dump: cannot modify a directory into a file");
+ if (mode != REPO_MODE_DIR && type == REPO_MODE_DIR)
+ die("invalid dump: cannot modify a file into a directory");
+ node_ctx.type = mode;
+ } else if (node_ctx.action == NODEACT_ADD) {
+ if (!have_text && type != REPO_MODE_DIR)
+ die("invalid dump: adds node without text");
+ } else {
+ die("invalid dump: Node-path block lacks Node-action");
+ }
+
+ /*
+ * Adjust mode to reflect properties.
+ */
+ if (have_props) {
+ if (!node_ctx.prop_delta)
+ node_ctx.type = type;
+ if (node_ctx.propLength)
+ read_props();
+ }
+
+ /*
+ * Save the result.
+ */
+ repo_add(node_ctx.dst, node_ctx.type, mark);
+ if (have_text)
+ fast_export_blob(node_ctx.type, mark,
+ node_ctx.textLength, &input);
+}
+
+static void handle_revision(void)
+{
+ if (rev_ctx.revision)
+ repo_commit(rev_ctx.revision, rev_ctx.author.buf,
+ &rev_ctx.log, dump_ctx.uuid.buf, dump_ctx.url.buf,
+ rev_ctx.timestamp);
+}
+
+void svndump_read(const char *url)
+{
+ char *val;
+ char *t;
+ uint32_t active_ctx = DUMP_CTX;
+ uint32_t len;
+
+ reset_dump_ctx(url);
+ while ((t = buffer_read_line(&input))) {
+ val = strchr(t, ':');
+ if (!val)
+ continue;
+ val++;
+ if (*val != ' ')
+ continue;
+ val++;
+
+ /* strlen(key) + 1 */
+ switch (val - t - 1) {
+ case sizeof("SVN-fs-dump-format-version"):
+ if (constcmp(t, "SVN-fs-dump-format-version"))
+ continue;
+ dump_ctx.version = atoi(val);
+ if (dump_ctx.version > 3)
+ die("expected svn dump format version <= 3, found %"PRIu32,
+ dump_ctx.version);
+ break;
+ case sizeof("UUID"):
+ if (constcmp(t, "UUID"))
+ continue;
+ strbuf_reset(&dump_ctx.uuid);
+ strbuf_addstr(&dump_ctx.uuid, val);
+ break;
+ case sizeof("Revision-number"):
+ if (constcmp(t, "Revision-number"))
+ continue;
+ if (active_ctx == NODE_CTX)
+ handle_node();
+ if (active_ctx != DUMP_CTX)
+ handle_revision();
+ active_ctx = REV_CTX;
+ reset_rev_ctx(atoi(val));
+ break;
+ case sizeof("Node-path"):
+ if (prefixcmp(t, "Node-"))
+ continue;
+ if (!constcmp(t + strlen("Node-"), "path")) {
+ if (active_ctx == NODE_CTX)
+ handle_node();
+ active_ctx = NODE_CTX;
+ reset_node_ctx(val);
+ break;
+ }
+ if (constcmp(t + strlen("Node-"), "kind"))
+ continue;
+ if (!strcmp(val, "dir"))
+ node_ctx.type = REPO_MODE_DIR;
+ else if (!strcmp(val, "file"))
+ node_ctx.type = REPO_MODE_BLB;
+ else
+ fprintf(stderr, "Unknown node-kind: %s\n", val);
+ break;
+ case sizeof("Node-action"):
+ if (constcmp(t, "Node-action"))
+ continue;
+ if (!strcmp(val, "delete")) {
+ node_ctx.action = NODEACT_DELETE;
+ } else if (!strcmp(val, "add")) {
+ node_ctx.action = NODEACT_ADD;
+ } else if (!strcmp(val, "change")) {
+ node_ctx.action = NODEACT_CHANGE;
+ } else if (!strcmp(val, "replace")) {
+ node_ctx.action = NODEACT_REPLACE;
+ } else {
+ fprintf(stderr, "Unknown node-action: %s\n", val);
+ node_ctx.action = NODEACT_UNKNOWN;
+ }
+ break;
+ case sizeof("Node-copyfrom-path"):
+ if (constcmp(t, "Node-copyfrom-path"))
+ continue;
+ pool_tok_seq(REPO_MAX_PATH_DEPTH, node_ctx.src, "/", val);
+ break;
+ case sizeof("Node-copyfrom-rev"):
+ if (constcmp(t, "Node-copyfrom-rev"))
+ continue;
+ node_ctx.srcRev = atoi(val);
+ break;
+ case sizeof("Text-content-length"):
+ if (!constcmp(t, "Text-content-length")) {
+ node_ctx.textLength = atoi(val);
+ break;
+ }
+ if (constcmp(t, "Prop-content-length"))
+ continue;
+ node_ctx.propLength = atoi(val);
+ break;
+ case sizeof("Text-delta"):
+ if (!constcmp(t, "Text-delta")) {
+ node_ctx.text_delta = !strcmp(val, "true");
+ break;
+ }
+ if (constcmp(t, "Prop-delta"))
+ continue;
+ node_ctx.prop_delta = !strcmp(val, "true");
+ break;
+ case sizeof("Content-length"):
+ if (constcmp(t, "Content-length"))
+ continue;
+ len = atoi(val);
+ t = buffer_read_line(&input);
+ if (!t)
+ die_short_read();
+ if (*t)
+ die("invalid dump: expected blank line after content length header");
+ if (active_ctx == REV_CTX) {
+ read_props();
+ } else if (active_ctx == NODE_CTX) {
+ handle_node();
+ active_ctx = REV_CTX;
+ } else {
+ fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
+ if (buffer_skip_bytes(&input, len) != len)
+ die_short_read();
+ }
+ }
+ }
+ if (buffer_ferror(&input))
+ die_short_read();
+ if (active_ctx == NODE_CTX)
+ handle_node();
+ if (active_ctx != DUMP_CTX)
+ handle_revision();
+}
+
+int svndump_init(const char *filename)
+{
+ if (buffer_init(&input, filename))
+ return error("cannot open %s: %s", filename, strerror(errno));
+ repo_init();
+ strbuf_init(&dump_ctx.uuid, 4096);
+ strbuf_init(&dump_ctx.url, 4096);
+ strbuf_init(&rev_ctx.log, 4096);
+ strbuf_init(&rev_ctx.author, 4096);
+ reset_dump_ctx(NULL);
+ reset_rev_ctx(0);
+ reset_node_ctx(NULL);
+ return 0;
+}
+
+void svndump_deinit(void)
+{
+ repo_reset();
+ reset_dump_ctx(NULL);
+ reset_rev_ctx(0);
+ reset_node_ctx(NULL);
+ strbuf_release(&rev_ctx.log);
+ if (buffer_deinit(&input))
+ fprintf(stderr, "Input error\n");
+ if (ferror(stdout))
+ fprintf(stderr, "Output error\n");
+}
+
+void svndump_reset(void)
+{
+ buffer_reset(&input);
+ repo_reset();
+ strbuf_release(&dump_ctx.uuid);
+ strbuf_release(&dump_ctx.url);
+ strbuf_release(&rev_ctx.log);
+ strbuf_release(&rev_ctx.author);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 01:28:38 +0000