+#include "git-compat-util.h"
#include "cache.h"
#include "pkt-line.h"
#include "quote.h"
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
+#include <signal.h>
-static char *server_capabilities = NULL;
+static char *server_capabilities;
+
+static int check_ref(const char *name, int len, unsigned int flags)
+{
+ if (!flags)
+ return 1;
+
+ if (len < 5 || memcmp(name, "refs/", 5))
+ return 0;
+
+ /* Skip the "refs/" part */
+ name += 5;
+ len -= 5;
+
+ /* REF_NORMAL means that we don't want the magic fake tag refs */
+ if ((flags & REF_NORMAL) && check_ref_format(name) < 0)
+ return 0;
+
+ /* REF_HEADS means that we want regular branch heads */
+ if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
+ return 1;
+
+ /* REF_TAGS means that we want tags */
+ if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
+ return 1;
+
+ /* All type bits clear means that we are ok with anything */
+ return !(flags & ~REF_NORMAL);
+}
/*
* Read all the refs from the other end
*/
struct ref **get_remote_heads(int in, struct ref **list,
- int nr_match, char **match, int ignore_funny)
+ int nr_match, char **match,
+ unsigned int flags)
{
*list = NULL;
for (;;) {
if (len != name_len + 41) {
if (server_capabilities)
free(server_capabilities);
- server_capabilities = strdup(name + name_len + 1);
+ server_capabilities = xstrdup(name + name_len + 1);
}
- if (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) &&
- check_ref_format(name + 5))
+ if (!check_ref(name, name_len, flags))
continue;
-
if (nr_match && !path_match(name, nr_match, match))
continue;
ref = xcalloc(1, sizeof(*ref) + len - 40);
- memcpy(ref->old_sha1, old_sha1, 20);
+ hashcpy(ref->old_sha1, old_sha1);
memcpy(ref->name, buffer + 41, len - 40);
*list = ref;
list = &ref->next;
line[--len] = 0;
if (!strcmp(line, "NAK"))
return 0;
- if (!strncmp(line, "ACK ", 3)) {
+ if (!strncmp(line, "ACK ", 4)) {
if (!get_sha1_hex(line+4, result_sha1)) {
if (strstr(line+45, "continue"))
return 2;
if (pathlen > len && path[pathlen - len - 1] != '/')
continue;
*s = 0;
- return 1;
+ return (i + 1);
}
return 0;
}
* +A:B means overwrite remote B with local A.
* +A is a shorthand for +A:A.
* A is a shorthand for A:A.
+ * :B means delete remote B.
*/
static struct refspec *parse_ref_spec(int nr_refspec, char **refspec)
{
struct ref *refs,
struct ref **matched_ref)
{
- int match;
int patlen = strlen(pattern);
+ struct ref *matched_weak = NULL;
+ struct ref *matched = NULL;
+ int weak_match = 0;
+ int match = 0;
- for (match = 0; refs; refs = refs->next) {
+ for (weak_match = match = 0; refs; refs = refs->next) {
char *name = refs->name;
int namelen = strlen(name);
+ int weak_match;
+
if (namelen < patlen ||
memcmp(name + namelen - patlen, pattern, patlen))
continue;
if (namelen != patlen && name[namelen - patlen - 1] != '/')
continue;
- match++;
- *matched_ref = refs;
+
+ /* A match is "weak" if it is with refs outside
+ * heads or tags, and did not specify the pattern
+ * in full (e.g. "refs/remotes/origin/master") or at
+ * least from the toplevel (e.g. "remotes/origin/master");
+ * otherwise "git push $URL master" would result in
+ * ambiguity between remotes/origin/master and heads/master
+ * at the remote site.
+ */
+ if (namelen != patlen &&
+ patlen != namelen - 5 &&
+ strncmp(name, "refs/heads/", 11) &&
+ strncmp(name, "refs/tags/", 10)) {
+ /* We want to catch the case where only weak
+ * matches are found and there are multiple
+ * matches, and where more than one strong
+ * matches are found, as ambiguous. One
+ * strong match with zero or more weak matches
+ * are acceptable as a unique match.
+ */
+ matched_weak = refs;
+ weak_match++;
+ }
+ else {
+ matched = refs;
+ match++;
+ }
+ }
+ if (!matched) {
+ *matched_ref = matched_weak;
+ return weak_match;
+ }
+ else {
+ *matched_ref = matched;
+ return match;
}
- return match;
}
static void link_dst_tail(struct ref *ref, struct ref ***tail)
unsigned char sha1[20];
struct ref *ref;
int len;
+
+ if (!*name) {
+ ref = xcalloc(1, sizeof(*ref) + 20);
+ strcpy(ref->name, "(delete)");
+ hashclr(ref->new_sha1);
+ return ref;
+ }
if (get_sha1(name, sha1))
return NULL;
len = strlen(name) + 1;
ref = xcalloc(1, sizeof(*ref) + len);
memcpy(ref->name, name, len);
- memcpy(ref->new_sha1, sha1, 20);
+ hashcpy(ref->new_sha1, sha1);
return ref;
}
break;
case 0:
/* The source could be in the get_sha1() format
- * not a reference name.
+ * not a reference name. :refs/other is a
+ * way to delete 'other' ref at the remote end.
*/
matched_src = try_explicit_object_name(rs[i].src);
if (matched_src)
int len = strlen(src->name) + 1;
dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
memcpy(dst_peer->name, src->name, len);
- memcpy(dst_peer->new_sha1, src->new_sha1, 20);
+ hashcpy(dst_peer->new_sha1, src->new_sha1);
link_dst_tail(dst_peer, dst_tail);
}
dst_peer->peer_ref = src;
#ifndef NO_IPV6
-static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
+/*
+ * Returns a connected socket() fd, or else die()s.
+ */
+static int git_tcp_connect_sock(char *host)
{
- int sockfd = -1;
+ int sockfd = -1, saved_errno = 0;
char *colon, *end;
- char *port = STR(DEFAULT_GIT_PORT);
+ const char *port = STR(DEFAULT_GIT_PORT);
struct addrinfo hints, *ai0, *ai;
int gai;
die("Unable to look up %s (%s)", host, gai_strerror(gai));
for (ai0 = ai; ai; ai = ai->ai_next) {
- sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
- if (sockfd < 0)
+ sockfd = socket(ai->ai_family,
+ ai->ai_socktype, ai->ai_protocol);
+ if (sockfd < 0) {
+ saved_errno = errno;
continue;
+ }
if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
+ saved_errno = errno;
close(sockfd);
sockfd = -1;
continue;
freeaddrinfo(ai0);
if (sockfd < 0)
- die("unable to connect a socket (%s)", strerror(errno));
+ die("unable to connect a socket (%s)", strerror(saved_errno));
- fd[0] = sockfd;
- fd[1] = sockfd;
- packet_write(sockfd, "%s %s\n", prog, path);
- return 0;
+ return sockfd;
}
#else /* NO_IPV6 */
-static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
+/*
+ * Returns a connected socket() fd, or else die()s.
+ */
+static int git_tcp_connect_sock(char *host)
{
- int sockfd = -1;
+ int sockfd = -1, saved_errno = 0;
char *colon, *end;
char *port = STR(DEFAULT_GIT_PORT), *ep;
struct hostent *he;
port = colon + 1;
}
-
he = gethostbyname(host);
if (!he)
die("Unable to look up %s (%s)", host, hstrerror(h_errno));
for (ap = he->h_addr_list; *ap; ap++) {
sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
- if (sockfd < 0)
+ if (sockfd < 0) {
+ saved_errno = errno;
continue;
+ }
memset(&sa, 0, sizeof sa);
sa.sin_family = he->h_addrtype;
memcpy(&sa.sin_addr, *ap, he->h_length);
if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
+ saved_errno = errno;
close(sockfd);
sockfd = -1;
continue;
}
if (sockfd < 0)
- die("unable to connect a socket (%s)", strerror(errno));
+ die("unable to connect a socket (%s)", strerror(saved_errno));
+
+ return sockfd;
+}
+
+#endif /* NO_IPV6 */
+
+
+static void git_tcp_connect(int fd[2], char *host)
+{
+ int sockfd = git_tcp_connect_sock(host);
fd[0] = sockfd;
fd[1] = sockfd;
- packet_write(sockfd, "%s %s\n", prog, path);
- return 0;
}
-#endif /* NO_IPV6 */
-static char *git_proxy_command = NULL;
-static const char *rhost_name = NULL;
+static char *git_proxy_command;
+static const char *rhost_name;
static int rhost_len;
static int git_proxy_command_options(const char *var, const char *value)
return (git_proxy_command && *git_proxy_command);
}
-static int git_proxy_connect(int fd[2], const char *prog, char *host, char *path)
+static void git_proxy_connect(int fd[2], char *host)
{
- char *port = STR(DEFAULT_GIT_PORT);
+ const char *port = STR(DEFAULT_GIT_PORT);
char *colon, *end;
int pipefd[2][2];
pid_t pid;
execlp(git_proxy_command, git_proxy_command, host, port, NULL);
die("exec failed");
}
+ if (pid < 0)
+ die("fork failed");
fd[0] = pipefd[0][0];
fd[1] = pipefd[1][1];
close(pipefd[0][1]);
close(pipefd[1][0]);
- packet_write(fd[1], "%s %s\n", prog, path);
- return pid;
}
+#define MAX_CMD_LEN 1024
+
/*
- * Yeah, yeah, fixme. Need to pass in the heads etc.
+ * This returns 0 if the transport protocol does not need fork(2),
+ * or a process id if it does. Once done, finish the connection
+ * with finish_connect() with the value returned from this function
+ * (it is safe to call finish_connect() with 0 to support the former
+ * case).
+ *
+ * Does not return a negative value on error; it just dies.
*/
-int git_connect(int fd[2], char *url, const char *prog)
+pid_t git_connect(int fd[2], char *url, const char *prog)
{
- char command[1024];
char *host, *path = url;
char *end;
int c;
int pipefd[2][2];
pid_t pid;
enum protocol protocol = PROTO_LOCAL;
+ int free_path = 0;
+
+ /* Without this we cannot rely on waitpid() to tell
+ * what happened to our children.
+ */
+ signal(SIGCHLD, SIG_DFL);
host = strstr(url, "://");
if(host) {
char *ptr = path;
if (path[1] == '~')
path++;
- else
- path = strdup(ptr);
+ else {
+ path = xstrdup(ptr);
+ free_path = 1;
+ }
*ptr = '\0';
}
if (protocol == PROTO_GIT) {
+ /* These underlying connection commands die() if they
+ * cannot connect.
+ */
+ char *target_host = xstrdup(host);
if (git_use_proxy(host))
- return git_proxy_connect(fd, prog, host, path);
- return git_tcp_connect(fd, prog, host, path);
+ git_proxy_connect(fd, host);
+ else
+ git_tcp_connect(fd, host);
+ /*
+ * Separate original protocol components prog and path
+ * from extended components with a NUL byte.
+ */
+ packet_write(fd[1],
+ "%s %s%chost=%s%c",
+ prog, path, 0,
+ target_host, 0);
+ free(target_host);
+ if (free_path)
+ free(path);
+ return 0;
}
if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
die("unable to create pipe pair for communication");
pid = fork();
+ if (pid < 0)
+ die("unable to fork");
if (!pid) {
- snprintf(command, sizeof(command), "%s %s", prog,
- sq_quote(path));
+ char command[MAX_CMD_LEN];
+ char *posn = command;
+ int size = MAX_CMD_LEN;
+ int of = 0;
+
+ of |= add_to_string(&posn, &size, prog, 0);
+ of |= add_to_string(&posn, &size, " ", 0);
+ of |= add_to_string(&posn, &size, path, 1);
+
+ if (of)
+ die("command line too long");
+
dup2(pipefd[1][0], 0);
dup2(pipefd[0][1], 1);
close(pipefd[0][0]);
ssh_basename++;
execlp(ssh, ssh_basename, host, command, NULL);
}
- else
+ else {
+ unsetenv(ALTERNATE_DB_ENVIRONMENT);
+ unsetenv(DB_ENVIRONMENT);
+ unsetenv(GIT_DIR_ENVIRONMENT);
+ unsetenv(GRAFT_ENVIRONMENT);
+ unsetenv(INDEX_ENVIRONMENT);
execlp("sh", "sh", "-c", command, NULL);
+ }
die("exec failed");
- }
+ }
fd[0] = pipefd[0][0];
fd[1] = pipefd[1][1];
close(pipefd[0][1]);
close(pipefd[1][0]);
+ if (free_path)
+ free(path);
return pid;
}
int finish_connect(pid_t pid)
{
- int ret;
+ if (pid == 0)
+ return 0;
- for (;;) {
- ret = waitpid(pid, NULL, 0);
- if (!ret)
- break;
+ while (waitpid(pid, NULL, 0) < 0) {
if (errno != EINTR)
- break;
+ return -1;
}
- return ret;
+ return 0;
}