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-rw-r--r--connect.c799
1 files changed, 799 insertions, 0 deletions
diff --git a/connect.c b/connect.c
new file mode 100644
index 0000000000..6090211fe9
--- /dev/null
+++ b/connect.c
@@ -0,0 +1,799 @@
+#include "git-compat-util.h"
+#include "cache.h"
+#include "pkt-line.h"
+#include "quote.h"
+#include "refs.h"
+#include "run-command.h"
+#include "remote.h"
+#include "connect.h"
+#include "url.h"
+#include "string-list.h"
+#include "sha1-array.h"
+
+static char *server_capabilities;
+static const char *parse_feature_value(const char *, const char *, int *);
+
+static int check_ref(const char *name, unsigned int flags)
+{
+ if (!flags)
+ return 1;
+
+ if (!skip_prefix(name, "refs/", &name))
+ return 0;
+
+ /* REF_NORMAL means that we don't want the magic fake tag refs */
+ if ((flags & REF_NORMAL) && check_refname_format(name, 0))
+ return 0;
+
+ /* REF_HEADS means that we want regular branch heads */
+ if ((flags & REF_HEADS) && starts_with(name, "heads/"))
+ return 1;
+
+ /* REF_TAGS means that we want tags */
+ if ((flags & REF_TAGS) && starts_with(name, "tags/"))
+ return 1;
+
+ /* All type bits clear means that we are ok with anything */
+ return !(flags & ~REF_NORMAL);
+}
+
+int check_ref_type(const struct ref *ref, int flags)
+{
+ return check_ref(ref->name, flags);
+}
+
+static void die_initial_contact(int got_at_least_one_head)
+{
+ if (got_at_least_one_head)
+ die("The remote end hung up upon initial contact");
+ else
+ die("Could not read from remote repository.\n\n"
+ "Please make sure you have the correct access rights\n"
+ "and the repository exists.");
+}
+
+static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
+{
+ char *sym, *target;
+ struct string_list_item *item;
+
+ if (!len)
+ return; /* just "symref" */
+ /* e.g. "symref=HEAD:refs/heads/master" */
+ sym = xmemdupz(val, len);
+ target = strchr(sym, ':');
+ if (!target)
+ /* just "symref=something" */
+ goto reject;
+ *(target++) = '\0';
+ if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
+ check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
+ /* "symref=bogus:pair */
+ goto reject;
+ item = string_list_append(symref, sym);
+ item->util = target;
+ return;
+reject:
+ free(sym);
+ return;
+}
+
+static void annotate_refs_with_symref_info(struct ref *ref)
+{
+ struct string_list symref = STRING_LIST_INIT_DUP;
+ const char *feature_list = server_capabilities;
+
+ while (feature_list) {
+ int len;
+ const char *val;
+
+ val = parse_feature_value(feature_list, "symref", &len);
+ if (!val)
+ break;
+ parse_one_symref_info(&symref, val, len);
+ feature_list = val + 1;
+ }
+ string_list_sort(&symref);
+
+ for (; ref; ref = ref->next) {
+ struct string_list_item *item;
+ item = string_list_lookup(&symref, ref->name);
+ if (!item)
+ continue;
+ ref->symref = xstrdup((char *)item->util);
+ }
+ string_list_clear(&symref, 0);
+}
+
+/*
+ * Read all the refs from the other end
+ */
+struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
+ struct ref **list, unsigned int flags,
+ struct sha1_array *extra_have,
+ struct sha1_array *shallow_points)
+{
+ struct ref **orig_list = list;
+ int got_at_least_one_head = 0;
+
+ *list = NULL;
+ for (;;) {
+ struct ref *ref;
+ unsigned char old_sha1[20];
+ char *name;
+ int len, name_len;
+ char *buffer = packet_buffer;
+ const char *arg;
+
+ len = packet_read(in, &src_buf, &src_len,
+ packet_buffer, sizeof(packet_buffer),
+ PACKET_READ_GENTLE_ON_EOF |
+ PACKET_READ_CHOMP_NEWLINE);
+ if (len < 0)
+ die_initial_contact(got_at_least_one_head);
+
+ if (!len)
+ break;
+
+ if (len > 4 && skip_prefix(buffer, "ERR ", &arg))
+ die("remote error: %s", arg);
+
+ if (len == 48 && skip_prefix(buffer, "shallow ", &arg)) {
+ if (get_sha1_hex(arg, old_sha1))
+ die("protocol error: expected shallow sha-1, got '%s'", arg);
+ if (!shallow_points)
+ die("repository on the other end cannot be shallow");
+ sha1_array_append(shallow_points, old_sha1);
+ continue;
+ }
+
+ if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
+ die("protocol error: expected sha/ref, got '%s'", buffer);
+ name = buffer + 41;
+
+ name_len = strlen(name);
+ if (len != name_len + 41) {
+ free(server_capabilities);
+ server_capabilities = xstrdup(name + name_len + 1);
+ }
+
+ if (extra_have && !strcmp(name, ".have")) {
+ sha1_array_append(extra_have, old_sha1);
+ continue;
+ }
+
+ if (!check_ref(name, flags))
+ continue;
+ ref = alloc_ref(buffer + 41);
+ hashcpy(ref->old_sha1, old_sha1);
+ *list = ref;
+ list = &ref->next;
+ got_at_least_one_head = 1;
+ }
+
+ annotate_refs_with_symref_info(*orig_list);
+
+ return list;
+}
+
+static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
+{
+ int len;
+
+ if (!feature_list)
+ return NULL;
+
+ len = strlen(feature);
+ while (*feature_list) {
+ const char *found = strstr(feature_list, feature);
+ if (!found)
+ return NULL;
+ if (feature_list == found || isspace(found[-1])) {
+ const char *value = found + len;
+ /* feature with no value (e.g., "thin-pack") */
+ if (!*value || isspace(*value)) {
+ if (lenp)
+ *lenp = 0;
+ return value;
+ }
+ /* feature with a value (e.g., "agent=git/1.2.3") */
+ else if (*value == '=') {
+ value++;
+ if (lenp)
+ *lenp = strcspn(value, " \t\n");
+ return value;
+ }
+ /*
+ * otherwise we matched a substring of another feature;
+ * keep looking
+ */
+ }
+ feature_list = found + 1;
+ }
+ return NULL;
+}
+
+int parse_feature_request(const char *feature_list, const char *feature)
+{
+ return !!parse_feature_value(feature_list, feature, NULL);
+}
+
+const char *server_feature_value(const char *feature, int *len)
+{
+ return parse_feature_value(server_capabilities, feature, len);
+}
+
+int server_supports(const char *feature)
+{
+ return !!server_feature_value(feature, NULL);
+}
+
+enum protocol {
+ PROTO_LOCAL = 1,
+ PROTO_FILE,
+ PROTO_SSH,
+ PROTO_GIT
+};
+
+int url_is_local_not_ssh(const char *url)
+{
+ const char *colon = strchr(url, ':');
+ const char *slash = strchr(url, '/');
+ return !colon || (slash && slash < colon) ||
+ has_dos_drive_prefix(url);
+}
+
+static const char *prot_name(enum protocol protocol)
+{
+ switch (protocol) {
+ case PROTO_LOCAL:
+ case PROTO_FILE:
+ return "file";
+ case PROTO_SSH:
+ return "ssh";
+ case PROTO_GIT:
+ return "git";
+ default:
+ return "unkown protocol";
+ }
+}
+
+static enum protocol get_protocol(const char *name)
+{
+ if (!strcmp(name, "ssh"))
+ return PROTO_SSH;
+ if (!strcmp(name, "git"))
+ return PROTO_GIT;
+ if (!strcmp(name, "git+ssh"))
+ return PROTO_SSH;
+ if (!strcmp(name, "ssh+git"))
+ return PROTO_SSH;
+ if (!strcmp(name, "file"))
+ return PROTO_FILE;
+ die("I don't handle protocol '%s'", name);
+}
+
+static char *host_end(char **hoststart, int removebrackets)
+{
+ char *host = *hoststart;
+ char *end;
+ char *start = strstr(host, "@[");
+ if (start)
+ start++; /* Jump over '@' */
+ else
+ start = host;
+ if (start[0] == '[') {
+ end = strchr(start + 1, ']');
+ if (end) {
+ if (removebrackets) {
+ *end = 0;
+ memmove(start, start + 1, end - start);
+ end++;
+ }
+ } else
+ end = host;
+ } else
+ end = host;
+ return end;
+}
+
+#define STR_(s) # s
+#define STR(s) STR_(s)
+
+static void get_host_and_port(char **host, const char **port)
+{
+ char *colon, *end;
+ end = host_end(host, 1);
+ colon = strchr(end, ':');
+ if (colon) {
+ long portnr = strtol(colon + 1, &end, 10);
+ if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
+ *colon = 0;
+ *port = colon + 1;
+ }
+ }
+}
+
+static void enable_keepalive(int sockfd)
+{
+ int ka = 1;
+
+ if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
+ fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
+ strerror(errno));
+}
+
+#ifndef NO_IPV6
+
+static const char *ai_name(const struct addrinfo *ai)
+{
+ static char addr[NI_MAXHOST];
+ if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
+ NI_NUMERICHOST) != 0)
+ strcpy(addr, "(unknown)");
+
+ return addr;
+}
+
+/*
+ * Returns a connected socket() fd, or else die()s.
+ */
+static int git_tcp_connect_sock(char *host, int flags)
+{
+ struct strbuf error_message = STRBUF_INIT;
+ int sockfd = -1;
+ const char *port = STR(DEFAULT_GIT_PORT);
+ struct addrinfo hints, *ai0, *ai;
+ int gai;
+ int cnt = 0;
+
+ get_host_and_port(&host, &port);
+ if (!*port)
+ port = "<none>";
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_protocol = IPPROTO_TCP;
+
+ if (flags & CONNECT_VERBOSE)
+ fprintf(stderr, "Looking up %s ... ", host);
+
+ gai = getaddrinfo(host, port, &hints, &ai);
+ if (gai)
+ die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
+
+ if (flags & CONNECT_VERBOSE)
+ fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
+
+ for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
+ sockfd = socket(ai->ai_family,
+ ai->ai_socktype, ai->ai_protocol);
+ if ((sockfd < 0) ||
+ (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
+ strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
+ host, cnt, ai_name(ai), strerror(errno));
+ if (0 <= sockfd)
+ close(sockfd);
+ sockfd = -1;
+ continue;
+ }
+ if (flags & CONNECT_VERBOSE)
+ fprintf(stderr, "%s ", ai_name(ai));
+ break;
+ }
+
+ freeaddrinfo(ai0);
+
+ if (sockfd < 0)
+ die("unable to connect to %s:\n%s", host, error_message.buf);
+
+ enable_keepalive(sockfd);
+
+ if (flags & CONNECT_VERBOSE)
+ fprintf(stderr, "done.\n");
+
+ strbuf_release(&error_message);
+
+ return sockfd;
+}
+
+#else /* NO_IPV6 */
+
+/*
+ * Returns a connected socket() fd, or else die()s.
+ */
+static int git_tcp_connect_sock(char *host, int flags)
+{
+ struct strbuf error_message = STRBUF_INIT;
+ int sockfd = -1;
+ const char *port = STR(DEFAULT_GIT_PORT);
+ char *ep;
+ struct hostent *he;
+ struct sockaddr_in sa;
+ char **ap;
+ unsigned int nport;
+ int cnt;
+
+ get_host_and_port(&host, &port);
+
+ if (flags & CONNECT_VERBOSE)
+ fprintf(stderr, "Looking up %s ... ", host);
+
+ he = gethostbyname(host);
+ if (!he)
+ die("Unable to look up %s (%s)", host, hstrerror(h_errno));
+ nport = strtoul(port, &ep, 10);
+ if ( ep == port || *ep ) {
+ /* Not numeric */
+ struct servent *se = getservbyname(port,"tcp");
+ if ( !se )
+ die("Unknown port %s", port);
+ nport = se->s_port;
+ }
+
+ if (flags & CONNECT_VERBOSE)
+ fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
+
+ for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
+ memset(&sa, 0, sizeof sa);
+ sa.sin_family = he->h_addrtype;
+ sa.sin_port = htons(nport);
+ memcpy(&sa.sin_addr, *ap, he->h_length);
+
+ sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
+ if ((sockfd < 0) ||
+ connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
+ strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
+ host,
+ cnt,
+ inet_ntoa(*(struct in_addr *)&sa.sin_addr),
+ strerror(errno));
+ if (0 <= sockfd)
+ close(sockfd);
+ sockfd = -1;
+ continue;
+ }
+ if (flags & CONNECT_VERBOSE)
+ fprintf(stderr, "%s ",
+ inet_ntoa(*(struct in_addr *)&sa.sin_addr));
+ break;
+ }
+
+ if (sockfd < 0)
+ die("unable to connect to %s:\n%s", host, error_message.buf);
+
+ enable_keepalive(sockfd);
+
+ if (flags & CONNECT_VERBOSE)
+ fprintf(stderr, "done.\n");
+
+ return sockfd;
+}
+
+#endif /* NO_IPV6 */
+
+
+static void git_tcp_connect(int fd[2], char *host, int flags)
+{
+ int sockfd = git_tcp_connect_sock(host, flags);
+
+ fd[0] = sockfd;
+ fd[1] = dup(sockfd);
+}
+
+
+static char *git_proxy_command;
+
+static int git_proxy_command_options(const char *var, const char *value,
+ void *cb)
+{
+ if (!strcmp(var, "core.gitproxy")) {
+ const char *for_pos;
+ int matchlen = -1;
+ int hostlen;
+ const char *rhost_name = cb;
+ int rhost_len = strlen(rhost_name);
+
+ if (git_proxy_command)
+ return 0;
+ if (!value)
+ return config_error_nonbool(var);
+ /* [core]
+ * ;# matches www.kernel.org as well
+ * gitproxy = netcatter-1 for kernel.org
+ * gitproxy = netcatter-2 for sample.xz
+ * gitproxy = netcatter-default
+ */
+ for_pos = strstr(value, " for ");
+ if (!for_pos)
+ /* matches everybody */
+ matchlen = strlen(value);
+ else {
+ hostlen = strlen(for_pos + 5);
+ if (rhost_len < hostlen)
+ matchlen = -1;
+ else if (!strncmp(for_pos + 5,
+ rhost_name + rhost_len - hostlen,
+ hostlen) &&
+ ((rhost_len == hostlen) ||
+ rhost_name[rhost_len - hostlen -1] == '.'))
+ matchlen = for_pos - value;
+ else
+ matchlen = -1;
+ }
+ if (0 <= matchlen) {
+ /* core.gitproxy = none for kernel.org */
+ if (matchlen == 4 &&
+ !memcmp(value, "none", 4))
+ matchlen = 0;
+ git_proxy_command = xmemdupz(value, matchlen);
+ }
+ return 0;
+ }
+
+ return git_default_config(var, value, cb);
+}
+
+static int git_use_proxy(const char *host)
+{
+ git_proxy_command = getenv("GIT_PROXY_COMMAND");
+ git_config(git_proxy_command_options, (void*)host);
+ return (git_proxy_command && *git_proxy_command);
+}
+
+static struct child_process *git_proxy_connect(int fd[2], char *host)
+{
+ const char *port = STR(DEFAULT_GIT_PORT);
+ struct child_process *proxy;
+
+ get_host_and_port(&host, &port);
+
+ proxy = xmalloc(sizeof(*proxy));
+ child_process_init(proxy);
+ argv_array_push(&proxy->args, git_proxy_command);
+ argv_array_push(&proxy->args, host);
+ argv_array_push(&proxy->args, port);
+ proxy->in = -1;
+ proxy->out = -1;
+ if (start_command(proxy))
+ die("cannot start proxy %s", git_proxy_command);
+ fd[0] = proxy->out; /* read from proxy stdout */
+ fd[1] = proxy->in; /* write to proxy stdin */
+ return proxy;
+}
+
+static char *get_port(char *host)
+{
+ char *end;
+ char *p = strchr(host, ':');
+
+ if (p) {
+ long port = strtol(p + 1, &end, 10);
+ if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
+ *p = '\0';
+ return p+1;
+ }
+ }
+
+ return NULL;
+}
+
+/*
+ * Extract protocol and relevant parts from the specified connection URL.
+ * The caller must free() the returned strings.
+ */
+static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
+ char **ret_path)
+{
+ char *url;
+ char *host, *path;
+ char *end;
+ int separator = '/';
+ enum protocol protocol = PROTO_LOCAL;
+
+ if (is_url(url_orig))
+ url = url_decode(url_orig);
+ else
+ url = xstrdup(url_orig);
+
+ host = strstr(url, "://");
+ if (host) {
+ *host = '\0';
+ protocol = get_protocol(url);
+ host += 3;
+ } else {
+ host = url;
+ if (!url_is_local_not_ssh(url)) {
+ protocol = PROTO_SSH;
+ separator = ':';
+ }
+ }
+
+ /*
+ * Don't do destructive transforms as protocol code does
+ * '[]' unwrapping in get_host_and_port()
+ */
+ end = host_end(&host, 0);
+
+ if (protocol == PROTO_LOCAL)
+ path = end;
+ else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
+ path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
+ else
+ path = strchr(end, separator);
+
+ if (!path || !*path)
+ die("No path specified. See 'man git-pull' for valid url syntax");
+
+ /*
+ * null-terminate hostname and point path to ~ for URL's like this:
+ * ssh://host.xz/~user/repo
+ */
+
+ end = path; /* Need to \0 terminate host here */
+ if (separator == ':')
+ path++; /* path starts after ':' */
+ if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
+ if (path[1] == '~')
+ path++;
+ }
+
+ path = xstrdup(path);
+ *end = '\0';
+
+ *ret_host = xstrdup(host);
+ *ret_path = path;
+ free(url);
+ return protocol;
+}
+
+static struct child_process no_fork = CHILD_PROCESS_INIT;
+
+/*
+ * This returns a dummy child_process if the transport protocol does not
+ * need fork(2), or a struct child_process object 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 NULL to support
+ * the former case).
+ *
+ * If it returns, the connect is successful; it just dies on errors (this
+ * will hopefully be changed in a libification effort, to return NULL when
+ * the connection failed).
+ */
+struct child_process *git_connect(int fd[2], const char *url,
+ const char *prog, int flags)
+{
+ char *hostandport, *path;
+ struct child_process *conn = &no_fork;
+ enum protocol protocol;
+ struct strbuf cmd = STRBUF_INIT;
+
+ /* Without this we cannot rely on waitpid() to tell
+ * what happened to our children.
+ */
+ signal(SIGCHLD, SIG_DFL);
+
+ protocol = parse_connect_url(url, &hostandport, &path);
+ if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
+ printf("Diag: url=%s\n", url ? url : "NULL");
+ printf("Diag: protocol=%s\n", prot_name(protocol));
+ printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
+ printf("Diag: path=%s\n", path ? path : "NULL");
+ conn = NULL;
+ } else if (protocol == PROTO_GIT) {
+ /*
+ * Set up virtual host information based on where we will
+ * connect, unless the user has overridden us in
+ * the environment.
+ */
+ char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
+ if (target_host)
+ target_host = xstrdup(target_host);
+ else
+ target_host = xstrdup(hostandport);
+
+ /* These underlying connection commands die() if they
+ * cannot connect.
+ */
+ if (git_use_proxy(hostandport))
+ conn = git_proxy_connect(fd, hostandport);
+ else
+ git_tcp_connect(fd, hostandport, flags);
+ /*
+ * Separate original protocol components prog and path
+ * from extended host header with a NUL byte.
+ *
+ * Note: Do not add any other headers here! Doing so
+ * will cause older git-daemon servers to crash.
+ */
+ packet_write(fd[1],
+ "%s %s%chost=%s%c",
+ prog, path, 0,
+ target_host, 0);
+ free(target_host);
+ } else {
+ conn = xmalloc(sizeof(*conn));
+ child_process_init(conn);
+
+ strbuf_addstr(&cmd, prog);
+ strbuf_addch(&cmd, ' ');
+ sq_quote_buf(&cmd, path);
+
+ conn->in = conn->out = -1;
+ if (protocol == PROTO_SSH) {
+ const char *ssh;
+ int putty;
+ char *ssh_host = hostandport;
+ const char *port = NULL;
+ get_host_and_port(&ssh_host, &port);
+
+ if (!port)
+ port = get_port(ssh_host);
+
+ if (flags & CONNECT_DIAG_URL) {
+ printf("Diag: url=%s\n", url ? url : "NULL");
+ printf("Diag: protocol=%s\n", prot_name(protocol));
+ printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
+ printf("Diag: port=%s\n", port ? port : "NONE");
+ printf("Diag: path=%s\n", path ? path : "NULL");
+
+ free(hostandport);
+ free(path);
+ free(conn);
+ return NULL;
+ } else {
+ ssh = getenv("GIT_SSH_COMMAND");
+ if (ssh) {
+ conn->use_shell = 1;
+ putty = 0;
+ } else {
+ ssh = getenv("GIT_SSH");
+ if (!ssh)
+ ssh = "ssh";
+ putty = !!strcasestr(ssh, "plink");
+ }
+
+ argv_array_push(&conn->args, ssh);
+ if (putty && !strcasestr(ssh, "tortoiseplink"))
+ argv_array_push(&conn->args, "-batch");
+ if (port) {
+ /* P is for PuTTY, p is for OpenSSH */
+ argv_array_push(&conn->args, putty ? "-P" : "-p");
+ argv_array_push(&conn->args, port);
+ }
+ argv_array_push(&conn->args, ssh_host);
+ }
+ } else {
+ /* remove repo-local variables from the environment */
+ conn->env = local_repo_env;
+ conn->use_shell = 1;
+ }
+ argv_array_push(&conn->args, cmd.buf);
+
+ if (start_command(conn))
+ die("unable to fork");
+
+ fd[0] = conn->out; /* read from child's stdout */
+ fd[1] = conn->in; /* write to child's stdin */
+ strbuf_release(&cmd);
+ }
+ free(hostandport);
+ free(path);
+ return conn;
+}
+
+int git_connection_is_socket(struct child_process *conn)
+{
+ return conn == &no_fork;
+}
+
+int finish_connect(struct child_process *conn)
+{
+ int code;
+ if (!conn || git_connection_is_socket(conn))
+ return 0;
+
+ code = finish_command(conn);
+ free(conn);
+ return code;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 11:52:04 +0000