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git/vcs-svn/svndump.c
Florian Achleitner 8e43a1d010 remote-svn: add incremental import 
Search for a note attached to the ref to update and read it's
'Revision-number:'-line. Start import from the next svn revision.

If there is no next revision in the svn repo, svnrdump terminates with
a message on stderr an non-zero return value. This looks a little
weird, but there is no other way to know whether there is a new
revision in the svn repo.

On the start of an incremental import, the parent of the first commit
in the fast-import stream is set to the branch name to update. All
following commits specify their parent by a mark number. Previous mark
files are currently not reused.

Signed-off-by: Florian Achleitner <florian.achleitner.2.6.31@gmail.com>
Acked-by: David Michael Barr <b@rr-dav.id.au>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-10-07 14:10:17 -07:00

541 lines
13 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 "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 REPORT_FILENO 3
#define NODEACT_REPLACE 4
#define NODEACT_DELETE 3
#define NODEACT_ADD 2
#define NODEACT_CHANGE 1
#define NODEACT_UNKNOWN 0
/* States: */
#define DUMP_CTX 0 /* dump metadata */
#define REV_CTX 1 /* revision metadata */
#define NODE_CTX 2 /* node metadata */
#define INTERNODE_CTX 3 /* between nodes */
#define DATE_RFC2822_LEN 31
static struct line_buffer input = LINE_BUFFER_INIT;
static struct {
uint32_t action, srcRev, type;
off_t prop_length, text_length;
struct strbuf src, dst;
uint32_t text_delta, prop_delta;
} node_ctx;
static struct {
uint32_t revision;
unsigned long timestamp;
struct strbuf log, author, note;
} 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.prop_length = -1;
node_ctx.text_length = -1;
strbuf_reset(&node_ctx.src);
node_ctx.srcRev = 0;
strbuf_reset(&node_ctx.dst);
if (fname)
strbuf_addstr(&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);
strbuf_reset(&rev_ctx.note);
}
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", 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", t);
}
}
}
static void handle_node(void)
{
const uint32_t type = node_ctx.type;
const int have_props = node_ctx.prop_length != -1;
const int have_text = node_ctx.text_length != -1;
/*
* Old text for this node:
* NULL - directory or bug
* empty_blob - empty
* "<dataref>" - data retrievable from fast-import
*/
static const char *const empty_blob = "::empty::";
const char *old_data = NULL;
uint32_t old_mode = REPO_MODE_BLB;
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.buf);
return;
}
if (node_ctx.action == NODEACT_REPLACE) {
repo_delete(node_ctx.dst.buf);
node_ctx.action = NODEACT_ADD;
}
if (node_ctx.srcRev) {
repo_copy(node_ctx.srcRev, node_ctx.src.buf, node_ctx.dst.buf);
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");
/*
* Find old content (old_data) and decide on the new mode.
*/
if (node_ctx.action == NODEACT_CHANGE && !*node_ctx.dst.buf) {
if (type != REPO_MODE_DIR)
die("invalid dump: root of tree is not a regular file");
old_data = NULL;
} else if (node_ctx.action == NODEACT_CHANGE) {
uint32_t mode;
old_data = repo_read_path(node_ctx.dst.buf, &mode);
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;
old_mode = mode;
} else if (node_ctx.action == NODEACT_ADD) {
if (type == REPO_MODE_DIR)
old_data = NULL;
else if (have_text)
old_data = empty_blob;
else
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.prop_length)
read_props();
}
/*
* Save the result.
*/
if (type == REPO_MODE_DIR) /* directories are not tracked. */
return;
assert(old_data);
if (old_data == empty_blob)
/* For the fast_export_* functions, NULL means empty. */
old_data = NULL;
if (!have_text) {
fast_export_modify(node_ctx.dst.buf, node_ctx.type, old_data);
return;
}
if (!node_ctx.text_delta) {
fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
fast_export_data(node_ctx.type, node_ctx.text_length, &input);
return;
}
fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
fast_export_blob_delta(node_ctx.type, old_mode, old_data,
node_ctx.text_length, &input);
}
static void begin_revision(const char *remote_ref)
{
if (!rev_ctx.revision) /* revision 0 gets no git commit. */
return;
fast_export_begin_commit(rev_ctx.revision, rev_ctx.author.buf,
&rev_ctx.log, dump_ctx.uuid.buf, dump_ctx.url.buf,
rev_ctx.timestamp, remote_ref);
}
static void end_revision(const char *note_ref)
{
struct strbuf mark = STRBUF_INIT;
if (rev_ctx.revision) {
fast_export_end_commit(rev_ctx.revision);
fast_export_begin_note(rev_ctx.revision, "remote-svn",
"Note created by remote-svn.", rev_ctx.timestamp, note_ref);
strbuf_addf(&mark, ":%"PRIu32, rev_ctx.revision);
fast_export_note(mark.buf, "inline");
fast_export_buf_to_data(&rev_ctx.note);
}
}
void svndump_read(const char *url, const char *local_ref, const char *notes_ref)
{
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 == REV_CTX)
begin_revision(local_ref);
if (active_ctx != DUMP_CTX)
end_revision(notes_ref);
active_ctx = REV_CTX;
reset_rev_ctx(atoi(val));
strbuf_addf(&rev_ctx.note, "%s\n", t);
break;
case sizeof("Node-path"):
if (constcmp(t, "Node-"))
continue;
if (!constcmp(t + strlen("Node-"), "path")) {
if (active_ctx == NODE_CTX)
handle_node();
if (active_ctx == REV_CTX)
begin_revision(local_ref);
active_ctx = NODE_CTX;
reset_node_ctx(val);
strbuf_addf(&rev_ctx.note, "%s\n", t);
break;
}
if (constcmp(t + strlen("Node-"), "kind"))
continue;
strbuf_addf(&rev_ctx.note, "%s\n", t);
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;
strbuf_addf(&rev_ctx.note, "%s\n", t);
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;
strbuf_reset(&node_ctx.src);
strbuf_addstr(&node_ctx.src, val);
strbuf_addf(&rev_ctx.note, "%s\n", t);
break;
case sizeof("Node-copyfrom-rev"):
if (constcmp(t, "Node-copyfrom-rev"))
continue;
node_ctx.srcRev = atoi(val);
strbuf_addf(&rev_ctx.note, "%s\n", t);
break;
case sizeof("Text-content-length"):
if (constcmp(t, "Text") && constcmp(t, "Prop"))
continue;
if (constcmp(t + 4, "-content-length"))
continue;
{
char *end;
uintmax_t len;
len = strtoumax(val, &end, 10);
if (!isdigit(*val) || *end)
die("invalid dump: non-numeric length %s", val);
if (len > maximum_signed_value_of_type(off_t))
die("unrepresentable length in dump: %s", val);
if (*t == 'T')
node_ctx.text_length = (off_t) len;
else
node_ctx.prop_length = (off_t) len;
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 = INTERNODE_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 == REV_CTX)
begin_revision(local_ref);
if (active_ctx != DUMP_CTX)
end_revision(notes_ref);
}
static void init(int report_fd)
{
fast_export_init(report_fd);
strbuf_init(&dump_ctx.uuid, 4096);
strbuf_init(&dump_ctx.url, 4096);
strbuf_init(&rev_ctx.log, 4096);
strbuf_init(&rev_ctx.author, 4096);
strbuf_init(&rev_ctx.note, 4096);
strbuf_init(&node_ctx.src, 4096);
strbuf_init(&node_ctx.dst, 4096);
reset_dump_ctx(NULL);
reset_rev_ctx(0);
reset_node_ctx(NULL);
return;
}
int svndump_init(const char *filename)
{
if (buffer_init(&input, filename))
return error("cannot open %s: %s", filename ? filename : "NULL", strerror(errno));
init(REPORT_FILENO);
return 0;
}
int svndump_init_fd(int in_fd, int back_fd)
{
if(buffer_fdinit(&input, xdup(in_fd)))
return error("cannot open fd %d: %s", in_fd, strerror(errno));
init(xdup(back_fd));
return 0;
}
void svndump_deinit(void)
{
fast_export_deinit();
reset_dump_ctx(NULL);
reset_rev_ctx(0);
reset_node_ctx(NULL);
strbuf_release(&rev_ctx.log);
strbuf_release(&rev_ctx.author);
strbuf_release(&rev_ctx.note);
strbuf_release(&node_ctx.src);
strbuf_release(&node_ctx.dst);
if (buffer_deinit(&input))
fprintf(stderr, "Input error\n");
if (ferror(stdout))
fprintf(stderr, "Output error\n");
}
void svndump_reset(void)
{
strbuf_release(&dump_ctx.uuid);
strbuf_release(&dump_ctx.url);
strbuf_release(&rev_ctx.log);
strbuf_release(&rev_ctx.author);
}
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