http: use strbufs instead of fixed buffers
We keep the names of incoming packs and objects in fixed PATH_MAX-size buffers, and snprintf() into them. This is unlikely to end up with truncated filenames, but it is possible (especially on systems where PATH_MAX is shorter than actual paths can be). Let's switch to using strbufs, which makes the question go away entirely. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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parent
468165c1d8
commit
390c6cbc5e
66
http.c
66
http.c
@ -2087,6 +2087,7 @@ void release_http_pack_request(struct http_pack_request *preq)
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preq->packfile = NULL;
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}
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preq->slot = NULL;
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strbuf_release(&preq->tmpfile);
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free(preq->url);
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free(preq);
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}
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@ -2109,19 +2110,19 @@ int finish_http_pack_request(struct http_pack_request *preq)
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lst = &((*lst)->next);
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*lst = (*lst)->next;
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if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
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if (!strip_suffix(preq->tmpfile.buf, ".pack.temp", &len))
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die("BUG: pack tmpfile does not end in .pack.temp?");
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tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
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tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile.buf);
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argv_array_push(&ip.args, "index-pack");
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argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
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argv_array_push(&ip.args, preq->tmpfile);
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argv_array_push(&ip.args, preq->tmpfile.buf);
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ip.git_cmd = 1;
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ip.no_stdin = 1;
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ip.no_stdout = 1;
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if (run_command(&ip)) {
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unlink(preq->tmpfile);
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unlink(preq->tmpfile.buf);
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unlink(tmp_idx);
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free(tmp_idx);
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return -1;
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@ -2129,7 +2130,7 @@ int finish_http_pack_request(struct http_pack_request *preq)
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unlink(sha1_pack_index_name(p->sha1));
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if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
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if (finalize_object_file(preq->tmpfile.buf, sha1_pack_name(p->sha1))
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|| finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
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free(tmp_idx);
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return -1;
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@ -2148,6 +2149,7 @@ struct http_pack_request *new_http_pack_request(
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struct http_pack_request *preq;
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preq = xcalloc(1, sizeof(*preq));
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strbuf_init(&preq->tmpfile, 0);
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preq->target = target;
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end_url_with_slash(&buf, base_url);
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@ -2155,12 +2157,11 @@ struct http_pack_request *new_http_pack_request(
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sha1_to_hex(target->sha1));
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preq->url = strbuf_detach(&buf, NULL);
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snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
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sha1_pack_name(target->sha1));
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preq->packfile = fopen(preq->tmpfile, "a");
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strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(target->sha1));
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preq->packfile = fopen(preq->tmpfile.buf, "a");
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if (!preq->packfile) {
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error("Unable to open local file %s for pack",
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preq->tmpfile);
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preq->tmpfile.buf);
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goto abort;
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}
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@ -2187,6 +2188,7 @@ struct http_pack_request *new_http_pack_request(
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return preq;
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abort:
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strbuf_release(&preq->tmpfile);
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free(preq->url);
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free(preq);
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return NULL;
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@ -2237,7 +2239,7 @@ struct http_object_request *new_http_object_request(const char *base_url,
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{
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char *hex = sha1_to_hex(sha1);
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struct strbuf filename = STRBUF_INIT;
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char prevfile[PATH_MAX];
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struct strbuf prevfile = STRBUF_INIT;
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int prevlocal;
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char prev_buf[PREV_BUF_SIZE];
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ssize_t prev_read = 0;
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@ -2245,40 +2247,41 @@ struct http_object_request *new_http_object_request(const char *base_url,
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struct http_object_request *freq;
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freq = xcalloc(1, sizeof(*freq));
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strbuf_init(&freq->tmpfile, 0);
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hashcpy(freq->sha1, sha1);
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freq->localfile = -1;
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sha1_file_name(&filename, sha1);
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snprintf(freq->tmpfile, sizeof(freq->tmpfile),
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"%s.temp", filename.buf);
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strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
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snprintf(prevfile, sizeof(prevfile), "%s.prev", filename.buf);
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unlink_or_warn(prevfile);
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rename(freq->tmpfile, prevfile);
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unlink_or_warn(freq->tmpfile);
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strbuf_addf(&prevfile, "%s.prev", filename.buf);
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unlink_or_warn(prevfile.buf);
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rename(freq->tmpfile.buf, prevfile.buf);
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unlink_or_warn(freq->tmpfile.buf);
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strbuf_release(&filename);
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if (freq->localfile != -1)
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error("fd leakage in start: %d", freq->localfile);
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freq->localfile = open(freq->tmpfile,
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freq->localfile = open(freq->tmpfile.buf,
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O_WRONLY | O_CREAT | O_EXCL, 0666);
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/*
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* This could have failed due to the "lazy directory creation";
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* try to mkdir the last path component.
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*/
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if (freq->localfile < 0 && errno == ENOENT) {
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char *dir = strrchr(freq->tmpfile, '/');
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char *dir = strrchr(freq->tmpfile.buf, '/');
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if (dir) {
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*dir = 0;
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mkdir(freq->tmpfile, 0777);
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mkdir(freq->tmpfile.buf, 0777);
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*dir = '/';
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}
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freq->localfile = open(freq->tmpfile,
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freq->localfile = open(freq->tmpfile.buf,
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O_WRONLY | O_CREAT | O_EXCL, 0666);
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}
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if (freq->localfile < 0) {
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error_errno("Couldn't create temporary file %s", freq->tmpfile);
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error_errno("Couldn't create temporary file %s",
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freq->tmpfile.buf);
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goto abort;
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}
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@ -2292,7 +2295,7 @@ struct http_object_request *new_http_object_request(const char *base_url,
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* If a previous temp file is present, process what was already
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* fetched.
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*/
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prevlocal = open(prevfile, O_RDONLY);
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prevlocal = open(prevfile.buf, O_RDONLY);
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if (prevlocal != -1) {
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do {
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prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
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@ -2309,7 +2312,8 @@ struct http_object_request *new_http_object_request(const char *base_url,
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} while (prev_read > 0);
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close(prevlocal);
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}
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unlink_or_warn(prevfile);
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unlink_or_warn(prevfile.buf);
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strbuf_release(&prevfile);
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/*
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* Reset inflate/SHA1 if there was an error reading the previous temp
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@ -2324,7 +2328,7 @@ struct http_object_request *new_http_object_request(const char *base_url,
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lseek(freq->localfile, 0, SEEK_SET);
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if (ftruncate(freq->localfile, 0) < 0) {
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error_errno("Couldn't truncate temporary file %s",
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freq->tmpfile);
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freq->tmpfile.buf);
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goto abort;
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}
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}
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@ -2354,6 +2358,7 @@ struct http_object_request *new_http_object_request(const char *base_url,
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return freq;
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abort:
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strbuf_release(&prevfile);
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free(freq->url);
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free(freq);
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return NULL;
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@ -2381,25 +2386,25 @@ int finish_http_object_request(struct http_object_request *freq)
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if (freq->http_code == 416) {
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warning("requested range invalid; we may already have all the data.");
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} else if (freq->curl_result != CURLE_OK) {
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if (stat(freq->tmpfile, &st) == 0)
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if (stat(freq->tmpfile.buf, &st) == 0)
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if (st.st_size == 0)
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unlink_or_warn(freq->tmpfile);
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unlink_or_warn(freq->tmpfile.buf);
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return -1;
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}
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git_inflate_end(&freq->stream);
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git_SHA1_Final(freq->real_sha1, &freq->c);
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if (freq->zret != Z_STREAM_END) {
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unlink_or_warn(freq->tmpfile);
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unlink_or_warn(freq->tmpfile.buf);
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return -1;
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}
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if (hashcmp(freq->sha1, freq->real_sha1)) {
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unlink_or_warn(freq->tmpfile);
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unlink_or_warn(freq->tmpfile.buf);
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return -1;
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}
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sha1_file_name(&filename, freq->sha1);
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freq->rename = finalize_object_file(freq->tmpfile, filename.buf);
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freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
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strbuf_release(&filename);
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return freq->rename;
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@ -2407,7 +2412,7 @@ int finish_http_object_request(struct http_object_request *freq)
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void abort_http_object_request(struct http_object_request *freq)
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{
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unlink_or_warn(freq->tmpfile);
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unlink_or_warn(freq->tmpfile.buf);
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release_http_object_request(freq);
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}
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@ -2427,4 +2432,5 @@ void release_http_object_request(struct http_object_request *freq)
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release_active_slot(freq->slot);
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freq->slot = NULL;
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}
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strbuf_release(&freq->tmpfile);
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}
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4
http.h
4
http.h
@ -200,7 +200,7 @@ struct http_pack_request {
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struct packed_git *target;
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struct packed_git **lst;
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FILE *packfile;
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char tmpfile[PATH_MAX];
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struct strbuf tmpfile;
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struct active_request_slot *slot;
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};
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@ -212,7 +212,7 @@ extern void release_http_pack_request(struct http_pack_request *preq);
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/* Helpers for fetching object */
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struct http_object_request {
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char *url;
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char tmpfile[PATH_MAX];
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struct strbuf tmpfile;
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int localfile;
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CURLcode curl_result;
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char errorstr[CURL_ERROR_SIZE];
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