diff options
Diffstat (limited to 'http-fetch.c')
| -rw-r--r-- | http-fetch.c | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/http-fetch.c b/http-fetch.c new file mode 100644 index 0000000..df99ba7 --- /dev/null +++ b/http-fetch.c @@ -0,0 +1,371 @@ +#include "cache.h" +#include "commit.h" + +#include "fetch.h" + +#include <curl/curl.h> +#include <curl/easy.h> + +#if LIBCURL_VERSION_NUM < 0x070704 +#define curl_global_cleanup() do { /* nothing */ } while(0) +#endif +#if LIBCURL_VERSION_NUM < 0x070800 +#define curl_global_init(a) do { /* nothing */ } while(0) +#endif + +static CURL *curl; + +static char *base; + +static SHA_CTX c; +static z_stream stream; + +static int local; +static int zret; + +static int curl_ssl_verify; + +struct buffer +{ + size_t posn; + size_t size; + void *buffer; +}; + +static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb, + struct buffer *buffer) +{ + size_t size = eltsize * nmemb; + if (size > buffer->size - buffer->posn) + size = buffer->size - buffer->posn; + memcpy(buffer->buffer + buffer->posn, ptr, size); + buffer->posn += size; + return size; +} + +static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb, + void *data) +{ + unsigned char expn[4096]; + size_t size = eltsize * nmemb; + int posn = 0; + do { + ssize_t retval = write(local, ptr + posn, size - posn); + if (retval < 0) + return posn; + posn += retval; + } while (posn < size); + + stream.avail_in = size; + stream.next_in = ptr; + do { + stream.next_out = expn; + stream.avail_out = sizeof(expn); + zret = inflate(&stream, Z_SYNC_FLUSH); + SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out); + } while (stream.avail_in && zret == Z_OK); + return size; +} + +void prefetch(unsigned char *sha1) +{ +} + +static int got_indices = 0; + +static struct packed_git *packs = NULL; + +static int fetch_index(unsigned char *sha1) +{ + char *filename; + char *url; + + FILE *indexfile; + + if (has_pack_index(sha1)) + return 0; + + if (get_verbosely) + fprintf(stderr, "Getting index for pack %s\n", + sha1_to_hex(sha1)); + + url = xmalloc(strlen(base) + 64); + sprintf(url, "%s/objects/pack/pack-%s.idx", + base, sha1_to_hex(sha1)); + + filename = sha1_pack_index_name(sha1); + indexfile = fopen(filename, "w"); + if (!indexfile) + return error("Unable to open local file %s for pack index", + filename); + + curl_easy_setopt(curl, CURLOPT_FILE, indexfile); + curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite); + curl_easy_setopt(curl, CURLOPT_URL, url); + + if (curl_easy_perform(curl)) { + fclose(indexfile); + return error("Unable to get pack index %s", url); + } + + fclose(indexfile); + return 0; +} + +static int setup_index(unsigned char *sha1) +{ + struct packed_git *new_pack; + if (has_pack_file(sha1)) + return 0; // don't list this as something we can get + + if (fetch_index(sha1)) + return -1; + + new_pack = parse_pack_index(sha1); + new_pack->next = packs; + packs = new_pack; + return 0; +} + +static int fetch_indices(void) +{ + unsigned char sha1[20]; + char *url; + struct buffer buffer; + char *data; + int i = 0; + + if (got_indices) + return 0; + + data = xmalloc(4096); + buffer.size = 4096; + buffer.posn = 0; + buffer.buffer = data; + + if (get_verbosely) + fprintf(stderr, "Getting pack list\n"); + + url = xmalloc(strlen(base) + 21); + sprintf(url, "%s/objects/info/packs", base); + + curl_easy_setopt(curl, CURLOPT_FILE, &buffer); + curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer); + curl_easy_setopt(curl, CURLOPT_URL, url); + + if (curl_easy_perform(curl)) { + return error("Unable to get pack index %s", url); + } + + do { + switch (data[i]) { + case 'P': + i++; + if (i + 52 < buffer.posn && + !strncmp(data + i, " pack-", 6) && + !strncmp(data + i + 46, ".pack\n", 6)) { + get_sha1_hex(data + i + 6, sha1); + setup_index(sha1); + i += 51; + break; + } + default: + while (data[i] != '\n') + i++; + } + i++; + } while (i < buffer.posn); + + got_indices = 1; + return 0; +} + +static int fetch_pack(unsigned char *sha1) +{ + char *url; + struct packed_git *target; + struct packed_git **lst; + FILE *packfile; + char *filename; + + if (fetch_indices()) + return -1; + target = find_sha1_pack(sha1, packs); + if (!target) + return error("Couldn't get %s: not separate or in any pack", + sha1_to_hex(sha1)); + + if (get_verbosely) { + fprintf(stderr, "Getting pack %s\n", + sha1_to_hex(target->sha1)); + fprintf(stderr, " which contains %s\n", + sha1_to_hex(sha1)); + } + + url = xmalloc(strlen(base) + 65); + sprintf(url, "%s/objects/pack/pack-%s.pack", + base, sha1_to_hex(target->sha1)); + + filename = sha1_pack_name(target->sha1); + packfile = fopen(filename, "w"); + if (!packfile) + return error("Unable to open local file %s for pack", + filename); + + curl_easy_setopt(curl, CURLOPT_FILE, packfile); + curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite); + curl_easy_setopt(curl, CURLOPT_URL, url); + + if (curl_easy_perform(curl)) { + fclose(packfile); + return error("Unable to get pack file %s", url); + } + + fclose(packfile); + + lst = &packs; + while (*lst != target) + lst = &((*lst)->next); + *lst = (*lst)->next; + + install_packed_git(target); + + return 0; +} + +int fetch(unsigned char *sha1) +{ + char *hex = sha1_to_hex(sha1); + char *filename = sha1_file_name(sha1); + unsigned char real_sha1[20]; + char *url; + char *posn; + + local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666); + + if (local < 0) + return error("Couldn't open local object %s\n", filename); + + memset(&stream, 0, sizeof(stream)); + + inflateInit(&stream); + + SHA1_Init(&c); + + curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1); + curl_easy_setopt(curl, CURLOPT_FILE, NULL); + curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file); + + url = xmalloc(strlen(base) + 50); + strcpy(url, base); + posn = url + strlen(base); + strcpy(posn, "objects/"); + posn += 8; + memcpy(posn, hex, 2); + posn += 2; + *(posn++) = '/'; + strcpy(posn, hex + 2); + + curl_easy_setopt(curl, CURLOPT_URL, url); + + if (curl_easy_perform(curl)) { + unlink(filename); + if (fetch_pack(sha1)) + return error("Tried %s", url); + return 0; + } + + close(local); + inflateEnd(&stream); + SHA1_Final(real_sha1, &c); + if (zret != Z_STREAM_END) { + unlink(filename); + return error("File %s (%s) corrupt\n", hex, url); + } + if (memcmp(sha1, real_sha1, 20)) { + unlink(filename); + return error("File %s has bad hash\n", hex); + } + + pull_say("got %s\n", hex); + return 0; +} + +int fetch_ref(char *ref, unsigned char *sha1) +{ + char *url, *posn; + char hex[42]; + struct buffer buffer; + buffer.size = 41; + buffer.posn = 0; + buffer.buffer = hex; + hex[41] = '\0'; + + curl_easy_setopt(curl, CURLOPT_FILE, &buffer); + curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer); + + url = xmalloc(strlen(base) + 6 + strlen(ref)); + strcpy(url, base); + posn = url + strlen(base); + strcpy(posn, "refs/"); + posn += 5; + strcpy(posn, ref); + + curl_easy_setopt(curl, CURLOPT_URL, url); + + if (curl_easy_perform(curl)) + return error("Couldn't get %s for %s\n", url, ref); + + hex[40] = '\0'; + get_sha1_hex(hex, sha1); + return 0; +} + +int main(int argc, char **argv) +{ + char *commit_id; + char *url; + int arg = 1; + + while (arg < argc && argv[arg][0] == '-') { + if (argv[arg][1] == 't') { + get_tree = 1; + } else if (argv[arg][1] == 'c') { + get_history = 1; + } else if (argv[arg][1] == 'a') { + get_all = 1; + get_tree = 1; + get_history = 1; + } else if (argv[arg][1] == 'v') { + get_verbosely = 1; + } else if (argv[arg][1] == 'w') { + write_ref = argv[arg + 1]; + arg++; + } + arg++; + } + if (argc < arg + 2) { + usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url"); + return 1; + } + commit_id = argv[arg]; + url = argv[arg + 1]; + + curl_global_init(CURL_GLOBAL_ALL); + + curl = curl_easy_init(); + + curl_ssl_verify = gitenv("GIT_SSL_NO_VERIFY") ? 0 : 1; + curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify); +#if LIBCURL_VERSION_NUM >= 0x070907 + curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL); +#endif + + base = url; + + if (pull(commit_id)) + return 1; + + curl_global_cleanup(); + return 0; +} |