mirror of
https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Christian Couder](/assets/img/avatar_default.png)
prefixcmp() and suffixcmp() share the common "cmp" suffix that typically are used to name functions that can be used for ordering, but they can't, because they are not antisymmetric: prefixcmp("foo", "foobar") < 0 prefixcmp("foobar", "foo") == 0 We in fact do not use these functions for ordering. Replace them with functions that just check for equality. Add starts_with() and end_with() that will be used to replace prefixcmp() and suffixcmp(), respectively, as the first step. These are named after corresponding functions/methods in programming languages, like Java, Python and Ruby. In vcs-svn/fast_export.c, there was already an ends_with() function that did the same thing. Let's use the new one instead while at it. Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
331 lines
8.9 KiB
C
331 lines
8.9 KiB
C
/*
|
|
* Licensed under a two-clause BSD-style license.
|
|
* See LICENSE for details.
|
|
*/
|
|
|
|
#include "cache.h"
|
|
#include "quote.h"
|
|
#include "fast_export.h"
|
|
#include "repo_tree.h"
|
|
#include "strbuf.h"
|
|
#include "svndiff.h"
|
|
#include "sliding_window.h"
|
|
#include "line_buffer.h"
|
|
|
|
#define MAX_GITSVN_LINE_LEN 4096
|
|
|
|
static uint32_t first_commit_done;
|
|
static struct line_buffer postimage = LINE_BUFFER_INIT;
|
|
static struct line_buffer report_buffer = LINE_BUFFER_INIT;
|
|
|
|
/* NEEDSWORK: move to fast_export_init() */
|
|
static int init_postimage(void)
|
|
{
|
|
static int postimage_initialized;
|
|
if (postimage_initialized)
|
|
return 0;
|
|
postimage_initialized = 1;
|
|
return buffer_tmpfile_init(&postimage);
|
|
}
|
|
|
|
void fast_export_init(int fd)
|
|
{
|
|
first_commit_done = 0;
|
|
if (buffer_fdinit(&report_buffer, fd))
|
|
die_errno("cannot read from file descriptor %d", fd);
|
|
}
|
|
|
|
void fast_export_deinit(void)
|
|
{
|
|
if (buffer_deinit(&report_buffer))
|
|
die_errno("error closing fast-import feedback stream");
|
|
}
|
|
|
|
void fast_export_delete(const char *path)
|
|
{
|
|
putchar('D');
|
|
putchar(' ');
|
|
quote_c_style(path, NULL, stdout, 0);
|
|
putchar('\n');
|
|
}
|
|
|
|
static void fast_export_truncate(const char *path, uint32_t mode)
|
|
{
|
|
fast_export_modify(path, mode, "inline");
|
|
printf("data 0\n\n");
|
|
}
|
|
|
|
void fast_export_modify(const char *path, uint32_t mode, const char *dataref)
|
|
{
|
|
/* Mode must be 100644, 100755, 120000, or 160000. */
|
|
if (!dataref) {
|
|
fast_export_truncate(path, mode);
|
|
return;
|
|
}
|
|
printf("M %06"PRIo32" %s ", mode, dataref);
|
|
quote_c_style(path, NULL, stdout, 0);
|
|
putchar('\n');
|
|
}
|
|
|
|
void fast_export_begin_note(uint32_t revision, const char *author,
|
|
const char *log, unsigned long timestamp, const char *note_ref)
|
|
{
|
|
static int firstnote = 1;
|
|
size_t loglen = strlen(log);
|
|
printf("commit %s\n", note_ref);
|
|
printf("committer %s <%s@%s> %ld +0000\n", author, author, "local", timestamp);
|
|
printf("data %"PRIuMAX"\n", (uintmax_t)loglen);
|
|
fwrite(log, loglen, 1, stdout);
|
|
if (firstnote) {
|
|
if (revision > 1)
|
|
printf("from %s^0", note_ref);
|
|
firstnote = 0;
|
|
}
|
|
fputc('\n', stdout);
|
|
}
|
|
|
|
void fast_export_note(const char *committish, const char *dataref)
|
|
{
|
|
printf("N %s %s\n", dataref, committish);
|
|
}
|
|
|
|
static char gitsvnline[MAX_GITSVN_LINE_LEN];
|
|
void fast_export_begin_commit(uint32_t revision, const char *author,
|
|
const struct strbuf *log,
|
|
const char *uuid, const char *url,
|
|
unsigned long timestamp, const char *local_ref)
|
|
{
|
|
static const struct strbuf empty = STRBUF_INIT;
|
|
if (!log)
|
|
log = ∅
|
|
if (*uuid && *url) {
|
|
snprintf(gitsvnline, MAX_GITSVN_LINE_LEN,
|
|
"\n\ngit-svn-id: %s@%"PRIu32" %s\n",
|
|
url, revision, uuid);
|
|
} else {
|
|
*gitsvnline = '\0';
|
|
}
|
|
printf("commit %s\n", local_ref);
|
|
printf("mark :%"PRIu32"\n", revision);
|
|
printf("committer %s <%s@%s> %ld +0000\n",
|
|
*author ? author : "nobody",
|
|
*author ? author : "nobody",
|
|
*uuid ? uuid : "local", timestamp);
|
|
printf("data %"PRIuMAX"\n",
|
|
(uintmax_t) (log->len + strlen(gitsvnline)));
|
|
fwrite(log->buf, log->len, 1, stdout);
|
|
printf("%s\n", gitsvnline);
|
|
if (!first_commit_done) {
|
|
if (revision > 1)
|
|
printf("from :%"PRIu32"\n", revision - 1);
|
|
first_commit_done = 1;
|
|
}
|
|
}
|
|
|
|
void fast_export_end_commit(uint32_t revision)
|
|
{
|
|
printf("progress Imported commit %"PRIu32".\n\n", revision);
|
|
}
|
|
|
|
static void ls_from_rev(uint32_t rev, const char *path)
|
|
{
|
|
/* ls :5 path/to/old/file */
|
|
printf("ls :%"PRIu32" ", rev);
|
|
quote_c_style(path, NULL, stdout, 0);
|
|
putchar('\n');
|
|
fflush(stdout);
|
|
}
|
|
|
|
static void ls_from_active_commit(const char *path)
|
|
{
|
|
/* ls "path/to/file" */
|
|
printf("ls \"");
|
|
quote_c_style(path, NULL, stdout, 1);
|
|
printf("\"\n");
|
|
fflush(stdout);
|
|
}
|
|
|
|
static const char *get_response_line(void)
|
|
{
|
|
const char *line = buffer_read_line(&report_buffer);
|
|
if (line)
|
|
return line;
|
|
if (buffer_ferror(&report_buffer))
|
|
die_errno("error reading from fast-import");
|
|
die("unexpected end of fast-import feedback");
|
|
}
|
|
|
|
static void die_short_read(struct line_buffer *input)
|
|
{
|
|
if (buffer_ferror(input))
|
|
die_errno("error reading dump file");
|
|
die("invalid dump: unexpected end of file");
|
|
}
|
|
|
|
static int parse_cat_response_line(const char *header, off_t *len)
|
|
{
|
|
uintmax_t n;
|
|
const char *type;
|
|
const char *end;
|
|
|
|
if (ends_with(header, " missing"))
|
|
return error("cat-blob reports missing blob: %s", header);
|
|
type = strstr(header, " blob ");
|
|
if (!type)
|
|
return error("cat-blob header has wrong object type: %s", header);
|
|
n = strtoumax(type + strlen(" blob "), (char **) &end, 10);
|
|
if (end == type + strlen(" blob "))
|
|
return error("cat-blob header does not contain length: %s", header);
|
|
if (memchr(type + strlen(" blob "), '-', end - type - strlen(" blob ")))
|
|
return error("cat-blob header contains negative length: %s", header);
|
|
if (n == UINTMAX_MAX || n > maximum_signed_value_of_type(off_t))
|
|
return error("blob too large for current definition of off_t");
|
|
*len = n;
|
|
if (*end)
|
|
return error("cat-blob header contains garbage after length: %s", header);
|
|
return 0;
|
|
}
|
|
|
|
static void check_preimage_overflow(off_t a, off_t b)
|
|
{
|
|
if (signed_add_overflows(a, b))
|
|
die("blob too large for current definition of off_t");
|
|
}
|
|
|
|
static long apply_delta(off_t len, struct line_buffer *input,
|
|
const char *old_data, uint32_t old_mode)
|
|
{
|
|
long ret;
|
|
struct sliding_view preimage = SLIDING_VIEW_INIT(&report_buffer, 0);
|
|
FILE *out;
|
|
|
|
if (init_postimage() || !(out = buffer_tmpfile_rewind(&postimage)))
|
|
die("cannot open temporary file for blob retrieval");
|
|
if (old_data) {
|
|
const char *response;
|
|
printf("cat-blob %s\n", old_data);
|
|
fflush(stdout);
|
|
response = get_response_line();
|
|
if (parse_cat_response_line(response, &preimage.max_off))
|
|
die("invalid cat-blob response: %s", response);
|
|
check_preimage_overflow(preimage.max_off, 1);
|
|
}
|
|
if (old_mode == REPO_MODE_LNK) {
|
|
strbuf_addstr(&preimage.buf, "link ");
|
|
check_preimage_overflow(preimage.max_off, strlen("link "));
|
|
preimage.max_off += strlen("link ");
|
|
check_preimage_overflow(preimage.max_off, 1);
|
|
}
|
|
if (svndiff0_apply(input, len, &preimage, out))
|
|
die("cannot apply delta");
|
|
if (old_data) {
|
|
/* Read the remainder of preimage and trailing newline. */
|
|
assert(!signed_add_overflows(preimage.max_off, 1));
|
|
preimage.max_off++; /* room for newline */
|
|
if (move_window(&preimage, preimage.max_off - 1, 1))
|
|
die("cannot seek to end of input");
|
|
if (preimage.buf.buf[0] != '\n')
|
|
die("missing newline after cat-blob response");
|
|
}
|
|
ret = buffer_tmpfile_prepare_to_read(&postimage);
|
|
if (ret < 0)
|
|
die("cannot read temporary file for blob retrieval");
|
|
strbuf_release(&preimage.buf);
|
|
return ret;
|
|
}
|
|
|
|
void fast_export_buf_to_data(const struct strbuf *data)
|
|
{
|
|
printf("data %"PRIuMAX"\n", (uintmax_t)data->len);
|
|
fwrite(data->buf, data->len, 1, stdout);
|
|
fputc('\n', stdout);
|
|
}
|
|
|
|
void fast_export_data(uint32_t mode, off_t len, struct line_buffer *input)
|
|
{
|
|
assert(len >= 0);
|
|
if (mode == REPO_MODE_LNK) {
|
|
/* svn symlink blobs start with "link " */
|
|
if (len < 5)
|
|
die("invalid dump: symlink too short for \"link\" prefix");
|
|
len -= 5;
|
|
if (buffer_skip_bytes(input, 5) != 5)
|
|
die_short_read(input);
|
|
}
|
|
printf("data %"PRIuMAX"\n", (uintmax_t) len);
|
|
if (buffer_copy_bytes(input, len) != len)
|
|
die_short_read(input);
|
|
fputc('\n', stdout);
|
|
}
|
|
|
|
static int parse_ls_response(const char *response, uint32_t *mode,
|
|
struct strbuf *dataref)
|
|
{
|
|
const char *tab;
|
|
const char *response_end;
|
|
|
|
assert(response);
|
|
response_end = response + strlen(response);
|
|
|
|
if (*response == 'm') { /* Missing. */
|
|
errno = ENOENT;
|
|
return -1;
|
|
}
|
|
|
|
/* Mode. */
|
|
if (response_end - response < (signed) strlen("100644") ||
|
|
response[strlen("100644")] != ' ')
|
|
die("invalid ls response: missing mode: %s", response);
|
|
*mode = 0;
|
|
for (; *response != ' '; response++) {
|
|
char ch = *response;
|
|
if (ch < '0' || ch > '7')
|
|
die("invalid ls response: mode is not octal: %s", response);
|
|
*mode *= 8;
|
|
*mode += ch - '0';
|
|
}
|
|
|
|
/* ' blob ' or ' tree ' */
|
|
if (response_end - response < (signed) strlen(" blob ") ||
|
|
(response[1] != 'b' && response[1] != 't'))
|
|
die("unexpected ls response: not a tree or blob: %s", response);
|
|
response += strlen(" blob ");
|
|
|
|
/* Dataref. */
|
|
tab = memchr(response, '\t', response_end - response);
|
|
if (!tab)
|
|
die("invalid ls response: missing tab: %s", response);
|
|
strbuf_add(dataref, response, tab - response);
|
|
return 0;
|
|
}
|
|
|
|
int fast_export_ls_rev(uint32_t rev, const char *path,
|
|
uint32_t *mode, struct strbuf *dataref)
|
|
{
|
|
ls_from_rev(rev, path);
|
|
return parse_ls_response(get_response_line(), mode, dataref);
|
|
}
|
|
|
|
int fast_export_ls(const char *path, uint32_t *mode, struct strbuf *dataref)
|
|
{
|
|
ls_from_active_commit(path);
|
|
return parse_ls_response(get_response_line(), mode, dataref);
|
|
}
|
|
|
|
void fast_export_blob_delta(uint32_t mode,
|
|
uint32_t old_mode, const char *old_data,
|
|
off_t len, struct line_buffer *input)
|
|
{
|
|
long postimage_len;
|
|
|
|
assert(len >= 0);
|
|
postimage_len = apply_delta(len, input, old_data, old_mode);
|
|
if (mode == REPO_MODE_LNK) {
|
|
buffer_skip_bytes(&postimage, strlen("link "));
|
|
postimage_len -= strlen("link ");
|
|
}
|
|
printf("data %ld\n", postimage_len);
|
|
buffer_copy_bytes(&postimage, postimage_len);
|
|
fputc('\n', stdout);
|
|
}
|