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tag: v1.8.1.4
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#include "cache.h"
#include "remote.h"
#include "strbuf.h"
#include "url.h"
#include "exec_cmd.h"
#include "run-command.h"
#include "vcs-svn/svndump.h"
#include "notes.h"
#include "argv-array.h"

static const char *url;
static int dump_from_file;
static const char *private_ref;
static const char *remote_ref = "refs/heads/master";
static const char *marksfilename, *notes_ref;
struct rev_note { unsigned int rev_nr; };

static int cmd_capabilities(const char *line);
static int cmd_import(const char *line);
static int cmd_list(const char *line);

typedef int (*input_command_handler)(const char *);
struct input_command_entry {
const char *name;
input_command_handler fn;
unsigned char batchable; /* whether the command starts or is part of a batch */
};

static const struct input_command_entry input_command_list[] = {
{ "capabilities", cmd_capabilities, 0 },
{ "import", cmd_import, 1 },
{ "list", cmd_list, 0 },
{ NULL, NULL }
};

static int cmd_capabilities(const char *line)
{
printf("import\n");
printf("bidi-import\n");
printf("refspec %s:%s\n\n", remote_ref, private_ref);
fflush(stdout);
return 0;
}

static void terminate_batch(void)
{
/* terminate a current batch's fast-import stream */
printf("done\n");
fflush(stdout);
}

/* NOTE: 'ref' refers to a git reference, while 'rev' refers to a svn revision. */
static char *read_ref_note(const unsigned char sha1[20])
{
const unsigned char *note_sha1;
char *msg = NULL;
unsigned long msglen;
enum object_type type;

init_notes(NULL, notes_ref, NULL, 0);
if (!(note_sha1 = get_note(NULL, sha1)))
return NULL; /* note tree not found */
if (!(msg = read_sha1_file(note_sha1, &type, &msglen)))
error("Empty notes tree. %s", notes_ref);
else if (!msglen || type != OBJ_BLOB) {
error("Note contains unusable content. "
"Is something else using this notes tree? %s", notes_ref);
free(msg);
msg = NULL;
}
free_notes(NULL);
return msg;
}

static int parse_rev_note(const char *msg, struct rev_note *res)
{
const char *key, *value, *end;
size_t len;

while (*msg) {
end = strchr(msg, '\n');
len = end ? end - msg : strlen(msg);

key = "Revision-number: ";
if (!prefixcmp(msg, key)) {
long i;
char *end;
value = msg + strlen(key);
i = strtol(value, &end, 0);
if (end == value || i < 0 || i > UINT32_MAX)
return -1;
res->rev_nr = i;
return 0;
}
msg += len + 1;
}
/* didn't find it */
return -1;
}

static int note2mark_cb(const unsigned char *object_sha1,
const unsigned char *note_sha1, char *note_path,
void *cb_data)
{
FILE *file = (FILE *)cb_data;
char *msg;
unsigned long msglen;
enum object_type type;
struct rev_note note;

if (!(msg = read_sha1_file(note_sha1, &type, &msglen)) ||
!msglen || type != OBJ_BLOB) {
free(msg);
return 1;
}
if (parse_rev_note(msg, &note))
return 2;
if (fprintf(file, ":%d %s\n", note.rev_nr, sha1_to_hex(object_sha1)) < 1)
return 3;
return 0;
}

static void regenerate_marks(void)
{
int ret;
FILE *marksfile = fopen(marksfilename, "w+");

if (!marksfile)
die_errno("Couldn't create mark file %s.", marksfilename);
ret = for_each_note(NULL, 0, note2mark_cb, marksfile);
if (ret)
die("Regeneration of marks failed, returned %d.", ret);
fclose(marksfile);
}

static void check_or_regenerate_marks(int latestrev)
{
FILE *marksfile;
struct strbuf sb = STRBUF_INIT;
struct strbuf line = STRBUF_INIT;
int found = 0;

if (latestrev < 1)
return;

init_notes(NULL, notes_ref, NULL, 0);
marksfile = fopen(marksfilename, "r");
if (!marksfile) {
regenerate_marks();
marksfile = fopen(marksfilename, "r");
if (!marksfile)
die_errno("cannot read marks file %s!", marksfilename);
fclose(marksfile);
} else {
strbuf_addf(&sb, ":%d ", latestrev);
while (strbuf_getline(&line, marksfile, '\n') != EOF) {
if (!prefixcmp(line.buf, sb.buf)) {
found++;
break;
}
}
fclose(marksfile);
if (!found)
regenerate_marks();
}
free_notes(NULL);
strbuf_release(&sb);
strbuf_release(&line);
}

static int cmd_import(const char *line)
{
int code;
int dumpin_fd;
char *note_msg;
unsigned char head_sha1[20];
unsigned int startrev;
struct argv_array svndump_argv = ARGV_ARRAY_INIT;
struct child_process svndump_proc;

if (read_ref(private_ref, head_sha1))
startrev = 0;
else {
note_msg = read_ref_note(head_sha1);
if(note_msg == NULL) {
warning("No note found for %s.", private_ref);
startrev = 0;
} else {
struct rev_note note = { 0 };
if (parse_rev_note(note_msg, &note))
die("Revision number couldn't be parsed from note.");
startrev = note.rev_nr + 1;
free(note_msg);
}
}
check_or_regenerate_marks(startrev - 1);

if (dump_from_file) {
dumpin_fd = open(url, O_RDONLY);
if(dumpin_fd < 0)
die_errno("Couldn't open svn dump file %s.", url);
} else {
memset(&svndump_proc, 0, sizeof(struct child_process));
svndump_proc.out = -1;
argv_array_push(&svndump_argv, "svnrdump");
argv_array_push(&svndump_argv, "dump");
argv_array_push(&svndump_argv, url);
argv_array_pushf(&svndump_argv, "-r%u:HEAD", startrev);
svndump_proc.argv = svndump_argv.argv;

code = start_command(&svndump_proc);
if (code)
die("Unable to start %s, code %d", svndump_proc.argv[0], code);
dumpin_fd = svndump_proc.out;
}
/* setup marks file import/export */
printf("feature import-marks-if-exists=%s\n"
"feature export-marks=%s\n", marksfilename, marksfilename);

svndump_init_fd(dumpin_fd, STDIN_FILENO);
svndump_read(url, private_ref, notes_ref);
svndump_deinit();
svndump_reset();

close(dumpin_fd);
if (!dump_from_file) {
code = finish_command(&svndump_proc);
if (code)
warning("%s, returned %d", svndump_proc.argv[0], code);
argv_array_clear(&svndump_argv);
}

return 0;
}

static int cmd_list(const char *line)
{
printf("? %s\n\n", remote_ref);
fflush(stdout);
return 0;
}

static int do_command(struct strbuf *line)
{
const struct input_command_entry *p = input_command_list;
static struct string_list batchlines = STRING_LIST_INIT_DUP;
static const struct input_command_entry *batch_cmd;
/*
* commands can be grouped together in a batch.
* Batches are ended by \n. If no batch is active the program ends.
* During a batch all lines are buffered and passed to the handler function
* when the batch is terminated.
*/
if (line->len == 0) {
if (batch_cmd) {
struct string_list_item *item;
for_each_string_list_item(item, &batchlines)
batch_cmd->fn(item->string);
terminate_batch();
batch_cmd = NULL;
string_list_clear(&batchlines, 0);
return 0; /* end of the batch, continue reading other commands. */
}
return 1; /* end of command stream, quit */
}
if (batch_cmd) {
if (prefixcmp(batch_cmd->name, line->buf))
die("Active %s batch interrupted by %s", batch_cmd->name, line->buf);
/* buffer batch lines */
string_list_append(&batchlines, line->buf);
return 0;
}

for (p = input_command_list; p->name; p++) {
if (!prefixcmp(line->buf, p->name) && (strlen(p->name) == line->len ||
line->buf[strlen(p->name)] == ' ')) {
if (p->batchable) {
batch_cmd = p;
string_list_append(&batchlines, line->buf);
return 0;
}
return p->fn(line->buf);
}
}
die("Unknown command '%s'\n", line->buf);
return 0;
}

int main(int argc, const char **argv)
{
struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT,
private_ref_sb = STRBUF_INIT, marksfilename_sb = STRBUF_INIT,
notes_ref_sb = STRBUF_INIT;
static struct remote *remote;
const char *url_in;

git_extract_argv0_path(argv[0]);
setup_git_directory();
if (argc < 2 || argc > 3) {
usage("git-remote-svn <remote-name> [<url>]");
return 1;
}

remote = remote_get(argv[1]);
url_in = (argc == 3) ? argv[2] : remote->url[0];

if (!prefixcmp(url_in, "file://")) {
dump_from_file = 1;
url = url_decode(url_in + sizeof("file://")-1);
} else {
dump_from_file = 0;
end_url_with_slash(&url_sb, url_in);
url = url_sb.buf;
}

strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name);
private_ref = private_ref_sb.buf;

strbuf_addf(&notes_ref_sb, "refs/notes/%s/revs", remote->name);
notes_ref = notes_ref_sb.buf;

strbuf_addf(&marksfilename_sb, "%s/info/fast-import/remote-svn/%s.marks",
get_git_dir(), remote->name);
marksfilename = marksfilename_sb.buf;

while (1) {
if (strbuf_getline(&buf, stdin, '\n') == EOF) {
if (ferror(stdin))
die("Error reading command stream");
else
die("Unexpected end of command stream");
}
if (do_command(&buf))
break;
strbuf_reset(&buf);
}

strbuf_release(&buf);
strbuf_release(&url_sb);
strbuf_release(&private_ref_sb);
strbuf_release(&notes_ref_sb);
strbuf_release(&marksfilename_sb);
return 0;
}
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