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#include "cache.h"
#include "transport.h"
#include "run-command.h"
#ifndef NO_CURL
#include "http.h"
#endif
#include "pkt-line.h"
#include "fetch-pack.h"
#include "send-pack.h"
#include "walker.h"
#include "bundle.h"
#include "dir.h"
#include "refs.h"

/* rsync support */

/*
* We copy packed-refs and refs/ into a temporary file, then read the
* loose refs recursively (sorting whenever possible), and then inserting
* those packed refs that are not yet in the list (not validating, but
* assuming that the file is sorted).
*
* Appears refactoring this from refs.c is too cumbersome.
*/

static int str_cmp(const void *a, const void *b)
{
const char *s1 = a;
const char *s2 = b;

return strcmp(s1, s2);
}

/* path->buf + name_offset is expected to point to "refs/" */

static int read_loose_refs(struct strbuf *path, int name_offset,
struct ref **tail)
{
DIR *dir = opendir(path->buf);
struct dirent *de;
struct {
char **entries;
int nr, alloc;
} list;
int i, pathlen;

if (!dir)
return -1;

memset (&list, 0, sizeof(list));

while ((de = readdir(dir))) {
if (is_dot_or_dotdot(de->d_name))
continue;
ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
list.entries[list.nr++] = xstrdup(de->d_name);
}
closedir(dir);

/* sort the list */

qsort(list.entries, list.nr, sizeof(char *), str_cmp);

pathlen = path->len;
strbuf_addch(path, '/');

for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
strbuf_addstr(path, list.entries[i]);
if (read_loose_refs(path, name_offset, tail)) {
int fd = open(path->buf, O_RDONLY);
char buffer[40];
struct ref *next;

if (fd < 0)
continue;
next = alloc_ref(path->buf + name_offset);
if (read_in_full(fd, buffer, 40) != 40 ||
get_sha1_hex(buffer, next->old_sha1)) {
close(fd);
free(next);
continue;
}
close(fd);
(*tail)->next = next;
*tail = next;
}
}
strbuf_setlen(path, pathlen);

for (i = 0; i < list.nr; i++)
free(list.entries[i]);
free(list.entries);

return 0;
}

/* insert the packed refs for which no loose refs were found */

static void insert_packed_refs(const char *packed_refs, struct ref **list)
{
FILE *f = fopen(packed_refs, "r");
static char buffer[PATH_MAX];

if (!f)
return;

for (;;) {
int cmp = cmp, len;

if (!fgets(buffer, sizeof(buffer), f)) {
fclose(f);
return;
}

if (hexval(buffer[0]) > 0xf)
continue;
len = strlen(buffer);
if (len && buffer[len - 1] == '\n')
buffer[--len] = '\0';
if (len < 41)
continue;
while ((*list)->next &&
(cmp = strcmp(buffer + 41,
(*list)->next->name)) > 0)
list = &(*list)->next;
if (!(*list)->next || cmp < 0) {
struct ref *next = alloc_ref(buffer + 41);
buffer[40] = '\0';
if (get_sha1_hex(buffer, next->old_sha1)) {
warning ("invalid SHA-1: %s", buffer);
free(next);
continue;
}
next->next = (*list)->next;
(*list)->next = next;
list = &(*list)->next;
}
}
}

static const char *rsync_url(const char *url)
{
return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
}

static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
{
struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
struct ref dummy, *tail = &dummy;
struct child_process rsync;
const char *args[5];
int temp_dir_len;

if (for_push)
return NULL;

/* copy the refs to the temporary directory */

strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
if (!mkdtemp(temp_dir.buf))
die ("Could not make temporary directory");
temp_dir_len = temp_dir.len;

strbuf_addstr(&buf, rsync_url(transport->url));
strbuf_addstr(&buf, "/refs");

memset(&rsync, 0, sizeof(rsync));
rsync.argv = args;
rsync.stdout_to_stderr = 1;
args[0] = "rsync";
args[1] = (transport->verbose > 0) ? "-rv" : "-r";
args[2] = buf.buf;
args[3] = temp_dir.buf;
args[4] = NULL;

if (run_command(&rsync))
die ("Could not run rsync to get refs");

strbuf_reset(&buf);
strbuf_addstr(&buf, rsync_url(transport->url));
strbuf_addstr(&buf, "/packed-refs");

args[2] = buf.buf;

if (run_command(&rsync))
die ("Could not run rsync to get refs");

/* read the copied refs */

strbuf_addstr(&temp_dir, "/refs");
read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
strbuf_setlen(&temp_dir, temp_dir_len);

tail = &dummy;
strbuf_addstr(&temp_dir, "/packed-refs");
insert_packed_refs(temp_dir.buf, &tail);
strbuf_setlen(&temp_dir, temp_dir_len);

if (remove_dir_recursively(&temp_dir, 0))
warning ("Error removing temporary directory %s.",
temp_dir.buf);

strbuf_release(&buf);
strbuf_release(&temp_dir);

return dummy.next;
}

static int fetch_objs_via_rsync(struct transport *transport,
int nr_objs, const struct ref **to_fetch)
{
struct strbuf buf = STRBUF_INIT;
struct child_process rsync;
const char *args[8];
int result;

strbuf_addstr(&buf, rsync_url(transport->url));
strbuf_addstr(&buf, "/objects/");

memset(&rsync, 0, sizeof(rsync));
rsync.argv = args;
rsync.stdout_to_stderr = 1;
args[0] = "rsync";
args[1] = (transport->verbose > 0) ? "-rv" : "-r";
args[2] = "--ignore-existing";
args[3] = "--exclude";
args[4] = "info";
args[5] = buf.buf;
args[6] = get_object_directory();
args[7] = NULL;

/* NEEDSWORK: handle one level of alternates */
result = run_command(&rsync);

strbuf_release(&buf);

return result;
}

static int write_one_ref(const char *name, const unsigned char *sha1,
int flags, void *data)
{
struct strbuf *buf = data;
int len = buf->len;
FILE *f;

/* when called via for_each_ref(), flags is non-zero */
if (flags && prefixcmp(name, "refs/heads/") &&
prefixcmp(name, "refs/tags/"))
return 0;

strbuf_addstr(buf, name);
if (safe_create_leading_directories(buf->buf) ||
!(f = fopen(buf->buf, "w")) ||
fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
fclose(f))
return error("problems writing temporary file %s", buf->buf);
strbuf_setlen(buf, len);
return 0;
}

static int write_refs_to_temp_dir(struct strbuf *temp_dir,
int refspec_nr, const char **refspec)
{
int i;

for (i = 0; i < refspec_nr; i++) {
unsigned char sha1[20];
char *ref;

if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
return error("Could not get ref %s", refspec[i]);

if (write_one_ref(ref, sha1, 0, temp_dir)) {
free(ref);
return -1;
}
free(ref);
}
return 0;
}

static int rsync_transport_push(struct transport *transport,
int refspec_nr, const char **refspec, int flags)
{
struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
int result = 0, i;
struct child_process rsync;
const char *args[10];

if (flags & TRANSPORT_PUSH_MIRROR)
return error("rsync transport does not support mirror mode");

/* first push the objects */

strbuf_addstr(&buf, rsync_url(transport->url));
strbuf_addch(&buf, '/');

memset(&rsync, 0, sizeof(rsync));
rsync.argv = args;
rsync.stdout_to_stderr = 1;
i = 0;
args[i++] = "rsync";
args[i++] = "-a";
if (flags & TRANSPORT_PUSH_DRY_RUN)
args[i++] = "--dry-run";
if (transport->verbose > 0)
args[i++] = "-v";
args[i++] = "--ignore-existing";
args[i++] = "--exclude";
args[i++] = "info";
args[i++] = get_object_directory();
args[i++] = buf.buf;
args[i++] = NULL;

if (run_command(&rsync))
return error("Could not push objects to %s",
rsync_url(transport->url));

/* copy the refs to the temporary directory; they could be packed. */

strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
if (!mkdtemp(temp_dir.buf))
die ("Could not make temporary directory");
strbuf_addch(&temp_dir, '/');

if (flags & TRANSPORT_PUSH_ALL) {
if (for_each_ref(write_one_ref, &temp_dir))
return -1;
} else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
return -1;

i = 2;
if (flags & TRANSPORT_PUSH_DRY_RUN)
args[i++] = "--dry-run";
if (!(flags & TRANSPORT_PUSH_FORCE))
args[i++] = "--ignore-existing";
args[i++] = temp_dir.buf;
args[i++] = rsync_url(transport->url);
args[i++] = NULL;
if (run_command(&rsync))
result = error("Could not push to %s",
rsync_url(transport->url));

if (remove_dir_recursively(&temp_dir, 0))
warning ("Could not remove temporary directory %s.",
temp_dir.buf);

strbuf_release(&buf);
strbuf_release(&temp_dir);

return result;
}

/* Generic functions for using commit walkers */

#ifndef NO_CURL /* http fetch is the only user */
static int fetch_objs_via_walker(struct transport *transport,
int nr_objs, const struct ref **to_fetch)
{
char *dest = xstrdup(transport->url);
struct walker *walker = transport->data;
char **objs = xmalloc(nr_objs * sizeof(*objs));
int i;

walker->get_all = 1;
walker->get_tree = 1;
walker->get_history = 1;
walker->get_verbosely = transport->verbose >= 0;
walker->get_recover = 0;

for (i = 0; i < nr_objs; i++)
objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));

if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
die("Fetch failed.");

for (i = 0; i < nr_objs; i++)
free(objs[i]);
free(objs);
free(dest);
return 0;
}
#endif /* NO_CURL */

static int disconnect_walker(struct transport *transport)
{
struct walker *walker = transport->data;
if (walker)
walker_free(walker);
return 0;
}

#ifndef NO_CURL
static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
{
const char **argv;
int argc;
int err;

if (flags & TRANSPORT_PUSH_MIRROR)
return error("http transport does not support mirror mode");

argv = xmalloc((refspec_nr + 12) * sizeof(char *));
argv[0] = "http-push";
argc = 1;
if (flags & TRANSPORT_PUSH_ALL)
argv[argc++] = "--all";
if (flags & TRANSPORT_PUSH_FORCE)
argv[argc++] = "--force";
if (flags & TRANSPORT_PUSH_DRY_RUN)
argv[argc++] = "--dry-run";
if (flags & TRANSPORT_PUSH_VERBOSE)
argv[argc++] = "--verbose";
argv[argc++] = transport->url;
while (refspec_nr--)
argv[argc++] = *refspec++;
argv[argc] = NULL;
err = run_command_v_opt(argv, RUN_GIT_CMD);
switch (err) {
case -ERR_RUN_COMMAND_FORK:
error("unable to fork for %s", argv[0]);
case -ERR_RUN_COMMAND_EXEC:
error("unable to exec %s", argv[0]);
break;
case -ERR_RUN_COMMAND_WAITPID:
case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
error("%s died with strange error", argv[0]);
}
return !!err;
}

static struct ref *get_refs_via_curl(struct transport *transport, int for_push)
{
struct strbuf buffer = STRBUF_INIT;
char *data, *start, *mid;
char *ref_name;
char *refs_url;
int i = 0;
int http_ret;

struct ref *refs = NULL;
struct ref *ref = NULL;
struct ref *last_ref = NULL;

struct walker *walker;

if (for_push)
return NULL;

if (!transport->data)
transport->data = get_http_walker(transport->url,
transport->remote);

walker = transport->data;

refs_url = xmalloc(strlen(transport->url) + 11);
sprintf(refs_url, "%s/info/refs", transport->url);

http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
switch (http_ret) {
case HTTP_OK:
break;
case HTTP_MISSING_TARGET:
die("%s not found: did you run git update-server-info on the"
" server?", refs_url);
default:
http_error(refs_url, http_ret);
die("HTTP request failed");
}

data = buffer.buf;
start = NULL;
mid = data;
while (i < buffer.len) {
if (!start)
start = &data[i];
if (data[i] == '\t')
mid = &data[i];
if (data[i] == '\n') {
data[i] = 0;
ref_name = mid + 1;
ref = xmalloc(sizeof(struct ref) +
strlen(ref_name) + 1);
memset(ref, 0, sizeof(struct ref));
strcpy(ref->name, ref_name);
get_sha1_hex(start, ref->old_sha1);
if (!refs)
refs = ref;
if (last_ref)
last_ref->next = ref;
last_ref = ref;
start = NULL;
}
i++;
}

strbuf_release(&buffer);

ref = alloc_ref("HEAD");
if (!walker->fetch_ref(walker, ref) &&
!resolve_remote_symref(ref, refs)) {
ref->next = refs;
refs = ref;
} else {
free(ref);
}

strbuf_release(&buffer);
free(refs_url);
return refs;
}

static int fetch_objs_via_curl(struct transport *transport,
int nr_objs, const struct ref **to_fetch)
{
if (!transport->data)
transport->data = get_http_walker(transport->url,
transport->remote);
return fetch_objs_via_walker(transport, nr_objs, to_fetch);
}

#endif

struct bundle_transport_data {
int fd;
struct bundle_header header;
};

static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
{
struct bundle_transport_data *data = transport->data;
struct ref *result = NULL;
int i;

if (for_push)
return NULL;

if (data->fd > 0)
close(data->fd);
data->fd = read_bundle_header(transport->url, &data->header);
if (data->fd < 0)
die ("Could not read bundle '%s'.", transport->url);
for (i = 0; i < data->header.references.nr; i++) {
struct ref_list_entry *e = data->header.references.list + i;
struct ref *ref = alloc_ref(e->name);
hashcpy(ref->old_sha1, e->sha1);
ref->next = result;
result = ref;
}
return result;
}

static int fetch_refs_from_bundle(struct transport *transport,
int nr_heads, const struct ref **to_fetch)
{
struct bundle_transport_data *data = transport->data;
return unbundle(&data->header, data->fd);
}

static int close_bundle(struct transport *transport)
{
struct bundle_transport_data *data = transport->data;
if (data->fd > 0)
close(data->fd);
free(data);
return 0;
}

struct git_transport_data {
unsigned thin : 1;
unsigned keep : 1;
unsigned followtags : 1;
int depth;
struct child_process *conn;
int fd[2];
const char *uploadpack;
const char *receivepack;
struct extra_have_objects extra_have;
};

static int set_git_option(struct transport *connection,
const char *name, const char *value)
{
struct git_transport_data *data = connection->data;
if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
data->uploadpack = value;
return 0;
} else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
data->receivepack = value;
return 0;
} else if (!strcmp(name, TRANS_OPT_THIN)) {
data->thin = !!value;
return 0;
} else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
data->followtags = !!value;
return 0;
} else if (!strcmp(name, TRANS_OPT_KEEP)) {
data->keep = !!value;
return 0;
} else if (!strcmp(name, TRANS_OPT_DEPTH)) {
if (!value)
data->depth = 0;
else
data->depth = atoi(value);
return 0;
}
return 1;
}

static int connect_setup(struct transport *transport, int for_push, int verbose)
{
struct git_transport_data *data = transport->data;
data->conn = git_connect(data->fd, transport->url,
for_push ? data->receivepack : data->uploadpack,
verbose ? CONNECT_VERBOSE : 0);
return 0;
}

static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
{
struct git_transport_data *data = transport->data;
struct ref *refs;

connect_setup(transport, for_push, 0);
get_remote_heads(data->fd[0], &refs, 0, NULL,
for_push ? REF_NORMAL : 0, &data->extra_have);

return refs;
}

static int fetch_refs_via_pack(struct transport *transport,
int nr_heads, const struct ref **to_fetch)
{
struct git_transport_data *data = transport->data;
char **heads = xmalloc(nr_heads * sizeof(*heads));
char **origh = xmalloc(nr_heads * sizeof(*origh));
const struct ref *refs;
char *dest = xstrdup(transport->url);
struct fetch_pack_args args;
int i;
struct ref *refs_tmp = NULL;

memset(&args, 0, sizeof(args));
args.uploadpack = data->uploadpack;
args.keep_pack = data->keep;
args.lock_pack = 1;
args.use_thin_pack = data->thin;
args.include_tag = data->followtags;
args.verbose = (transport->verbose > 0);
args.quiet = (transport->verbose < 0);
args.no_progress = args.quiet || (!transport->progress && !isatty(1));
args.depth = data->depth;

for (i = 0; i < nr_heads; i++)
origh[i] = heads[i] = xstrdup(to_fetch[i]->name);

if (!data->conn) {
connect_setup(transport, 0, 0);
get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
}

refs = fetch_pack(&args, data->fd, data->conn,
refs_tmp ? refs_tmp : transport->remote_refs,
dest, nr_heads, heads, &transport->pack_lockfile);
close(data->fd[0]);
close(data->fd[1]);
if (finish_connect(data->conn))
refs = NULL;
data->conn = NULL;

free_refs(refs_tmp);

for (i = 0; i < nr_heads; i++)
free(origh[i]);
free(origh);
free(heads);
free(dest);
return (refs ? 0 : -1);
}

static int refs_pushed(struct ref *ref)
{
for (; ref; ref = ref->next) {
switch(ref->status) {
case REF_STATUS_NONE:
case REF_STATUS_UPTODATE:
break;
default:
return 1;
}
}
return 0;
}

static void update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
{
struct refspec rs;

if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
return;

rs.src = ref->name;
rs.dst = NULL;

if (!remote_find_tracking(remote, &rs)) {
if (verbose)
fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
if (ref->deletion) {
delete_ref(rs.dst, NULL, 0);
} else
update_ref("update by push", rs.dst,
ref->new_sha1, NULL, 0, 0);
free(rs.dst);
}
}

#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)

static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
{
fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
if (from)
fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
else
fputs(prettify_refname(to->name), stderr);
if (msg) {
fputs(" (", stderr);
fputs(msg, stderr);
fputc(')', stderr);
}
fputc('\n', stderr);
}

static const char *status_abbrev(unsigned char sha1[20])
{
return find_unique_abbrev(sha1, DEFAULT_ABBREV);
}

static void print_ok_ref_status(struct ref *ref)
{
if (ref->deletion)
print_ref_status('-', "[deleted]", ref, NULL, NULL);
else if (is_null_sha1(ref->old_sha1))
print_ref_status('*',
(!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
"[new branch]"),
ref, ref->peer_ref, NULL);
else {
char quickref[84];
char type;
const char *msg;

strcpy(quickref, status_abbrev(ref->old_sha1));
if (ref->nonfastforward) {
strcat(quickref, "...");
type = '+';
msg = "forced update";
} else {
strcat(quickref, "..");
type = ' ';
msg = NULL;
}
strcat(quickref, status_abbrev(ref->new_sha1));

print_ref_status(type, quickref, ref, ref->peer_ref, msg);
}
}

static int print_one_push_status(struct ref *ref, const char *dest, int count)
{
if (!count)
fprintf(stderr, "To %s\n", dest);

switch(ref->status) {
case REF_STATUS_NONE:
print_ref_status('X', "[no match]", ref, NULL, NULL);
break;
case REF_STATUS_REJECT_NODELETE:
print_ref_status('!', "[rejected]", ref, NULL,
"remote does not support deleting refs");
break;
case REF_STATUS_UPTODATE:
print_ref_status('=', "[up to date]", ref,
ref->peer_ref, NULL);
break;
case REF_STATUS_REJECT_NONFASTFORWARD:
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"non-fast forward");
break;
case REF_STATUS_REMOTE_REJECT:
print_ref_status('!', "[remote rejected]", ref,
ref->deletion ? NULL : ref->peer_ref,
ref->remote_status);
break;
case REF_STATUS_EXPECTING_REPORT:
print_ref_status('!', "[remote failure]", ref,
ref->deletion ? NULL : ref->peer_ref,
"remote failed to report status");
break;
case REF_STATUS_OK:
print_ok_ref_status(ref);
break;
}

return 1;
}

static void print_push_status(const char *dest, struct ref *refs, int verbose)
{
struct ref *ref;
int n = 0;

if (verbose) {
for (ref = refs; ref; ref = ref->next)
if (ref->status == REF_STATUS_UPTODATE)
n += print_one_push_status(ref, dest, n);
}

for (ref = refs; ref; ref = ref->next)
if (ref->status == REF_STATUS_OK)
n += print_one_push_status(ref, dest, n);

for (ref = refs; ref; ref = ref->next) {
if (ref->status != REF_STATUS_NONE &&
ref->status != REF_STATUS_UPTODATE &&
ref->status != REF_STATUS_OK)
n += print_one_push_status(ref, dest, n);
}
}

static void verify_remote_names(int nr_heads, const char **heads)
{
int i;

for (i = 0; i < nr_heads; i++) {
const char *local = heads[i];
const char *remote = strrchr(heads[i], ':');

if (*local == '+')
local++;

/* A matching refspec is okay. */
if (remote == local && remote[1] == '\0')
continue;

remote = remote ? (remote + 1) : local;
switch (check_ref_format(remote)) {
case 0: /* ok */
case CHECK_REF_FORMAT_ONELEVEL:
/* ok but a single level -- that is fine for
* a match pattern.
*/
case CHECK_REF_FORMAT_WILDCARD:
/* ok but ends with a pattern-match character */
continue;
}
die("remote part of refspec is not a valid name in %s",
heads[i]);
}
}

static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
{
struct git_transport_data *data = transport->data;
struct send_pack_args args;
int ret;

if (!data->conn) {
struct ref *tmp_refs;
connect_setup(transport, 1, 0);

get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
NULL);
}

args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
args.use_thin_pack = data->thin;
args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);

ret = send_pack(&args, data->fd, data->conn, remote_refs,
&data->extra_have);

close(data->fd[1]);
close(data->fd[0]);
ret |= finish_connect(data->conn);
data->conn = NULL;

return ret;
}

static int disconnect_git(struct transport *transport)
{
struct git_transport_data *data = transport->data;
if (data->conn) {
packet_flush(data->fd[1]);
close(data->fd[0]);
close(data->fd[1]);
finish_connect(data->conn);
}

free(data);
return 0;
}

static int is_local(const char *url)
{
const char *colon = strchr(url, ':');
const char *slash = strchr(url, '/');
return !colon || (slash && slash < colon) ||
has_dos_drive_prefix(url);
}

static int is_file(const char *url)
{
struct stat buf;
if (stat(url, &buf))
return 0;
return S_ISREG(buf.st_mode);
}

struct transport *transport_get(struct remote *remote, const char *url)
{
struct transport *ret = xcalloc(1, sizeof(*ret));

ret->remote = remote;
ret->url = url;

if (!prefixcmp(url, "rsync:")) {
ret->get_refs_list = get_refs_via_rsync;
ret->fetch = fetch_objs_via_rsync;
ret->push = rsync_transport_push;

} else if (!prefixcmp(url, "http://")
|| !prefixcmp(url, "https://")
|| !prefixcmp(url, "ftp://")) {
#ifdef NO_CURL
error("git was compiled without libcurl support.");
#else
ret->get_refs_list = get_refs_via_curl;
ret->fetch = fetch_objs_via_curl;
ret->push = curl_transport_push;
#endif
ret->disconnect = disconnect_walker;

} else if (is_local(url) && is_file(url)) {
struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
ret->data = data;
ret->get_refs_list = get_refs_from_bundle;
ret->fetch = fetch_refs_from_bundle;
ret->disconnect = close_bundle;

} else {
struct git_transport_data *data = xcalloc(1, sizeof(*data));
ret->data = data;
ret->set_option = set_git_option;
ret->get_refs_list = get_refs_via_connect;
ret->fetch = fetch_refs_via_pack;
ret->push_refs = git_transport_push;
ret->disconnect = disconnect_git;

data->thin = 1;
data->conn = NULL;
data->uploadpack = "git-upload-pack";
if (remote && remote->uploadpack)
data->uploadpack = remote->uploadpack;
data->receivepack = "git-receive-pack";
if (remote && remote->receivepack)
data->receivepack = remote->receivepack;
}

return ret;
}

int transport_set_option(struct transport *transport,
const char *name, const char *value)
{
if (transport->set_option)
return transport->set_option(transport, name, value);
return 1;
}

int transport_push(struct transport *transport,
int refspec_nr, const char **refspec, int flags)
{
verify_remote_names(refspec_nr, refspec);

if (transport->push)
return transport->push(transport, refspec_nr, refspec, flags);
if (transport->push_refs) {
struct ref *remote_refs =
transport->get_refs_list(transport, 1);
struct ref *local_refs = get_local_heads();
int match_flags = MATCH_REFS_NONE;
int verbose = flags & TRANSPORT_PUSH_VERBOSE;
int ret;

if (flags & TRANSPORT_PUSH_ALL)
match_flags |= MATCH_REFS_ALL;
if (flags & TRANSPORT_PUSH_MIRROR)
match_flags |= MATCH_REFS_MIRROR;

if (match_refs(local_refs, &remote_refs,
refspec_nr, refspec, match_flags)) {
return -1;
}

ret = transport->push_refs(transport, remote_refs, flags);

print_push_status(transport->url, remote_refs, verbose);

if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
struct ref *ref;
for (ref = remote_refs; ref; ref = ref->next)
update_tracking_ref(transport->remote, ref, verbose);
}

if (!ret && !refs_pushed(remote_refs))
fprintf(stderr, "Everything up-to-date\n");
return ret;
}
return 1;
}

const struct ref *transport_get_remote_refs(struct transport *transport)
{
if (!transport->remote_refs)
transport->remote_refs = transport->get_refs_list(transport, 0);
return transport->remote_refs;
}

int transport_fetch_refs(struct transport *transport, const struct ref *refs)
{
int rc;
int nr_heads = 0, nr_alloc = 0;
const struct ref **heads = NULL;
const struct ref *rm;

for (rm = refs; rm; rm = rm->next) {
if (rm->peer_ref &&
!hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
continue;
ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
heads[nr_heads++] = rm;
}

rc = transport->fetch(transport, nr_heads, heads);
free(heads);
return rc;
}

void transport_unlock_pack(struct transport *transport)
{
if (transport->pack_lockfile) {
unlink_or_warn(transport->pack_lockfile);
free(transport->pack_lockfile);
transport->pack_lockfile = NULL;
}
}

int transport_disconnect(struct transport *transport)
{
int ret = 0;
if (transport->disconnect)
ret = transport->disconnect(transport);
free(transport);
return ret;
}

/*
* Strip username (and password) from an url and return
* it in a newly allocated string.
*/
char *transport_anonymize_url(const char *url)
{
char *anon_url, *scheme_prefix, *anon_part;
size_t anon_len, prefix_len = 0;

anon_part = strchr(url, '@');
if (is_local(url) || !anon_part)
goto literal_copy;

anon_len = strlen(++anon_part);
scheme_prefix = strstr(url, "://");
if (!scheme_prefix) {
if (!strchr(anon_part, ':'))
/* cannot be "me@there:/path/name" */
goto literal_copy;
} else {
const char *cp;
/* make sure scheme is reasonable */
for (cp = url; cp < scheme_prefix; cp++) {
switch (*cp) {
/* RFC 1738 2.1 */
case '+': case '.': case '-':
break; /* ok */
default:
if (isalnum(*cp))
break;
/* it isn't */
goto literal_copy;
}
}
/* @ past the first slash does not count */
cp = strchr(scheme_prefix + 3, '/');
if (cp && cp < anon_part)
goto literal_copy;
prefix_len = scheme_prefix - url + 3;
}
anon_url = xcalloc(1, 1 + prefix_len + anon_len);
memcpy(anon_url, url, prefix_len);
memcpy(anon_url + prefix_len, anon_part, anon_len);
return anon_url;
literal_copy:
return xstrdup(url);
}
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