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bb246590a1
We just say "Expected two arguments" when we get a different number of arguments, but we can be slightly friendlier. People shouldn't generally be running remote helpers themselves, but curious users might say "git remote-ext -h". Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
202 lines
4.6 KiB
C
202 lines
4.6 KiB
C
#include "builtin.h"
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#include "transport.h"
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#include "run-command.h"
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#include "pkt-line.h"
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static const char usage_msg[] =
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"git remote-ext <remote> <url>";
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/*
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* URL syntax:
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* 'command [arg1 [arg2 [...]]]' Invoke command with given arguments.
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* Special characters:
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* '% ': Literal space in argument.
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* '%%': Literal percent sign.
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* '%S': Name of service (git-upload-pack/git-upload-archive/
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* git-receive-pack.
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* '%s': Same as \s, but with possible git- prefix stripped.
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* '%G': Only allowed as first 'character' of argument. Do not pass this
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* Argument to command, instead send this as name of repository
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* in in-line git://-style request (also activates sending this
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* style of request).
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* '%V': Only allowed as first 'character' of argument. Used in
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* conjunction with '%G': Do not pass this argument to command,
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* instead send this as vhost in git://-style request (note: does
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* not activate sending git:// style request).
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*/
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static char *git_req;
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static char *git_req_vhost;
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static char *strip_escapes(const char *str, const char *service,
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const char **next)
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{
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size_t rpos = 0;
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int escape = 0;
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char special = 0;
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const char *service_noprefix = service;
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struct strbuf ret = STRBUF_INIT;
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skip_prefix(service_noprefix, "git-", &service_noprefix);
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/* Pass the service to command. */
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setenv("GIT_EXT_SERVICE", service, 1);
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setenv("GIT_EXT_SERVICE_NOPREFIX", service_noprefix, 1);
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/* Scan the length of argument. */
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while (str[rpos] && (escape || str[rpos] != ' ')) {
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if (escape) {
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switch (str[rpos]) {
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case ' ':
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case '%':
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case 's':
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case 'S':
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break;
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case 'G':
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case 'V':
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special = str[rpos];
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if (rpos == 1)
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break;
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/* Fall-through to error. */
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default:
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die("Bad remote-ext placeholder '%%%c'.",
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str[rpos]);
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}
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escape = 0;
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} else
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escape = (str[rpos] == '%');
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rpos++;
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}
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if (escape && !str[rpos])
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die("remote-ext command has incomplete placeholder");
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*next = str + rpos;
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if (**next == ' ')
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++*next; /* Skip over space */
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/*
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* Do the actual placeholder substitution. The string will be short
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* enough not to overflow integers.
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*/
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rpos = special ? 2 : 0; /* Skip first 2 bytes in specials. */
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escape = 0;
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while (str[rpos] && (escape || str[rpos] != ' ')) {
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if (escape) {
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switch (str[rpos]) {
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case ' ':
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case '%':
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strbuf_addch(&ret, str[rpos]);
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break;
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case 's':
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strbuf_addstr(&ret, service_noprefix);
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break;
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case 'S':
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strbuf_addstr(&ret, service);
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break;
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}
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escape = 0;
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} else
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switch (str[rpos]) {
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case '%':
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escape = 1;
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break;
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default:
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strbuf_addch(&ret, str[rpos]);
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break;
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}
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rpos++;
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}
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switch (special) {
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case 'G':
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git_req = strbuf_detach(&ret, NULL);
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return NULL;
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case 'V':
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git_req_vhost = strbuf_detach(&ret, NULL);
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return NULL;
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default:
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return strbuf_detach(&ret, NULL);
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}
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}
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static void parse_argv(struct argv_array *out, const char *arg, const char *service)
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{
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while (*arg) {
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char *expanded = strip_escapes(arg, service, &arg);
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if (expanded)
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argv_array_push(out, expanded);
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free(expanded);
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}
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}
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static void send_git_request(int stdin_fd, const char *serv, const char *repo,
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const char *vhost)
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{
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if (!vhost)
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packet_write_fmt(stdin_fd, "%s %s%c", serv, repo, 0);
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else
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packet_write_fmt(stdin_fd, "%s %s%chost=%s%c", serv, repo, 0,
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vhost, 0);
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}
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static int run_child(const char *arg, const char *service)
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{
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int r;
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struct child_process child = CHILD_PROCESS_INIT;
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child.in = -1;
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child.out = -1;
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child.err = 0;
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parse_argv(&child.args, arg, service);
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if (start_command(&child) < 0)
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die("Can't run specified command");
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if (git_req)
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send_git_request(child.in, service, git_req, git_req_vhost);
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r = bidirectional_transfer_loop(child.out, child.in);
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if (!r)
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r = finish_command(&child);
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else
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finish_command(&child);
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return r;
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}
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#define MAXCOMMAND 4096
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static int command_loop(const char *child)
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{
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char buffer[MAXCOMMAND];
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while (1) {
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size_t i;
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if (!fgets(buffer, MAXCOMMAND - 1, stdin)) {
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if (ferror(stdin))
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die("Command input error");
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exit(0);
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}
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/* Strip end of line characters. */
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i = strlen(buffer);
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while (i > 0 && isspace(buffer[i - 1]))
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buffer[--i] = 0;
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if (!strcmp(buffer, "capabilities")) {
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printf("*connect\n\n");
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fflush(stdout);
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} else if (!strncmp(buffer, "connect ", 8)) {
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printf("\n");
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fflush(stdout);
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return run_child(child, buffer + 8);
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} else {
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fprintf(stderr, "Bad command");
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return 1;
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}
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}
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}
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int cmd_remote_ext(int argc, const char **argv, const char *prefix)
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{
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if (argc != 3)
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usage(usage_msg);
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return command_loop(argv[2]);
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}
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