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git/vcs-svn/svndump.c

455 lines
11 KiB
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/*
* 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);
}
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