mirror of
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0cb9d6d6b6
When we report an error to the client, we format it into a fixed-size buffer using vsprintf(). This can't actually overflow in practice, since we only format a very tame subset of strings (mostly strerror() output). However, it's hard to tell immediately, so let's just use a strbuf so readers do not have to wonder. We do add an allocation here, but the performance is not important; the next step is to call die() anyway. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
/*
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* Copyright (c) 2006 Franck Bui-Huu
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*/
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#include "cache.h"
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#include "builtin.h"
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#include "archive.h"
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#include "pkt-line.h"
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#include "sideband.h"
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#include "run-command.h"
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#include "argv-array.h"
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static const char upload_archive_usage[] =
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"git upload-archive <repo>";
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static const char deadchild[] =
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"git upload-archive: archiver died with error";
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#define MAX_ARGS (64)
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int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix)
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{
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struct argv_array sent_argv = ARGV_ARRAY_INIT;
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const char *arg_cmd = "argument ";
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if (argc != 2)
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usage(upload_archive_usage);
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if (!enter_repo(argv[1], 0))
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die("'%s' does not appear to be a git repository", argv[1]);
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/* put received options in sent_argv[] */
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argv_array_push(&sent_argv, "git-upload-archive");
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for (;;) {
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char *buf = packet_read_line(0, NULL);
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if (!buf)
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break; /* got a flush */
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if (sent_argv.argc > MAX_ARGS)
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die("Too many options (>%d)", MAX_ARGS - 1);
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if (!starts_with(buf, arg_cmd))
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die("'argument' token or flush expected");
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argv_array_push(&sent_argv, buf + strlen(arg_cmd));
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}
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/* parse all options sent by the client */
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return write_archive(sent_argv.argc, sent_argv.argv, prefix, 0, NULL, 1);
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}
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__attribute__((format (printf, 1, 2)))
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static void error_clnt(const char *fmt, ...)
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{
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struct strbuf buf = STRBUF_INIT;
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va_list params;
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va_start(params, fmt);
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strbuf_vaddf(&buf, fmt, params);
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va_end(params);
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send_sideband(1, 3, buf.buf, buf.len, LARGE_PACKET_MAX);
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die("sent error to the client: %s", buf.buf);
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}
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static ssize_t process_input(int child_fd, int band)
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{
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char buf[16384];
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ssize_t sz = read(child_fd, buf, sizeof(buf));
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if (sz < 0) {
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if (errno != EAGAIN && errno != EINTR)
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error_clnt("read error: %s\n", strerror(errno));
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return sz;
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}
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send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
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return sz;
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}
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int cmd_upload_archive(int argc, const char **argv, const char *prefix)
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{
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struct child_process writer = { argv };
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/*
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* Set up sideband subprocess.
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*
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* We (parent) monitor and read from child, sending its fd#1 and fd#2
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* multiplexed out to our fd#1. If the child dies, we tell the other
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* end over channel #3.
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*/
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argv[0] = "upload-archive--writer";
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writer.out = writer.err = -1;
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writer.git_cmd = 1;
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if (start_command(&writer)) {
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int err = errno;
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packet_write(1, "NACK unable to spawn subprocess\n");
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die("upload-archive: %s", strerror(err));
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}
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packet_write(1, "ACK\n");
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packet_flush(1);
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while (1) {
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struct pollfd pfd[2];
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pfd[0].fd = writer.out;
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pfd[0].events = POLLIN;
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pfd[1].fd = writer.err;
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pfd[1].events = POLLIN;
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if (poll(pfd, 2, -1) < 0) {
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if (errno != EINTR) {
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error("poll failed resuming: %s",
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strerror(errno));
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sleep(1);
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}
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continue;
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}
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if (pfd[1].revents & POLLIN)
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/* Status stream ready */
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if (process_input(pfd[1].fd, 2))
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continue;
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if (pfd[0].revents & POLLIN)
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/* Data stream ready */
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if (process_input(pfd[0].fd, 1))
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continue;
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if (finish_command(&writer))
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error_clnt("%s", deadchild);
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packet_flush(1);
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break;
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}
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return 0;
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}
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