mirror of
https://github.com/git/git.git
synced 2024-11-18 04:14:01 +01:00
09d920831e
Unlike write_sha1_file() that tries to create the object file in a temporary location and then move it to the final location, fetch_object could have been interrupted in the middle, leaving a corrupt file. Signed-off-by: Junio C Hamano <junkio@cox.net>
529 lines
12 KiB
C
529 lines
12 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "fetch.h"
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#include <curl/curl.h>
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#include <curl/easy.h>
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#if LIBCURL_VERSION_NUM < 0x070704
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#define curl_global_cleanup() do { /* nothing */ } while(0)
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#endif
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#if LIBCURL_VERSION_NUM < 0x070800
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#define curl_global_init(a) do { /* nothing */ } while(0)
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#endif
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static CURL *curl;
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static struct curl_slist *no_pragma_header;
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static char *initial_base;
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struct alt_base
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{
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char *base;
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int got_indices;
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struct packed_git *packs;
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struct alt_base *next;
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};
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struct alt_base *alt = NULL;
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static SHA_CTX c;
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static z_stream stream;
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static int local;
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static int zret;
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static int curl_ssl_verify;
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struct buffer
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{
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size_t posn;
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size_t size;
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void *buffer;
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};
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static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
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struct buffer *buffer)
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{
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size_t size = eltsize * nmemb;
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if (size > buffer->size - buffer->posn)
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size = buffer->size - buffer->posn;
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memcpy(buffer->buffer + buffer->posn, ptr, size);
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buffer->posn += size;
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return size;
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}
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static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
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void *data)
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{
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unsigned char expn[4096];
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size_t size = eltsize * nmemb;
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int posn = 0;
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do {
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ssize_t retval = write(local, ptr + posn, size - posn);
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if (retval < 0)
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return posn;
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posn += retval;
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} while (posn < size);
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stream.avail_in = size;
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stream.next_in = ptr;
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do {
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stream.next_out = expn;
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stream.avail_out = sizeof(expn);
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zret = inflate(&stream, Z_SYNC_FLUSH);
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SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
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} while (stream.avail_in && zret == Z_OK);
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return size;
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}
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void prefetch(unsigned char *sha1)
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{
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}
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static int got_alternates = 0;
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static int fetch_index(struct alt_base *repo, unsigned char *sha1)
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{
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char *filename;
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char *url;
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FILE *indexfile;
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if (has_pack_index(sha1))
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return 0;
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if (get_verbosely)
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fprintf(stderr, "Getting index for pack %s\n",
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sha1_to_hex(sha1));
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url = xmalloc(strlen(repo->base) + 64);
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sprintf(url, "%s/objects/pack/pack-%s.idx",
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repo->base, sha1_to_hex(sha1));
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filename = sha1_pack_index_name(sha1);
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indexfile = fopen(filename, "w");
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if (!indexfile)
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return error("Unable to open local file %s for pack index",
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filename);
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curl_easy_setopt(curl, CURLOPT_FILE, indexfile);
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
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curl_easy_setopt(curl, CURLOPT_URL, url);
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curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
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if (curl_easy_perform(curl)) {
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fclose(indexfile);
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return error("Unable to get pack index %s", url);
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}
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fclose(indexfile);
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return 0;
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}
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static int setup_index(struct alt_base *repo, unsigned char *sha1)
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{
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struct packed_git *new_pack;
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if (has_pack_file(sha1))
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return 0; // don't list this as something we can get
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if (fetch_index(repo, sha1))
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return -1;
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new_pack = parse_pack_index(sha1);
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new_pack->next = repo->packs;
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repo->packs = new_pack;
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return 0;
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}
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static int fetch_alternates(char *base)
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{
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int ret = 0;
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struct buffer buffer;
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char *url;
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char *data;
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int i = 0;
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int http_specific = 1;
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if (got_alternates)
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return 0;
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data = xmalloc(4096);
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buffer.size = 4095;
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buffer.posn = 0;
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buffer.buffer = data;
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if (get_verbosely)
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fprintf(stderr, "Getting alternates list\n");
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url = xmalloc(strlen(base) + 31);
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sprintf(url, "%s/objects/info/http-alternates", base);
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curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
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curl_easy_setopt(curl, CURLOPT_URL, url);
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if (curl_easy_perform(curl) || !buffer.posn) {
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http_specific = 0;
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sprintf(url, "%s/objects/info/alternates", base);
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curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
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curl_easy_setopt(curl, CURLOPT_URL, url);
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if (curl_easy_perform(curl)) {
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return 0;
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}
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}
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data[buffer.posn] = '\0';
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while (i < buffer.posn) {
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int posn = i;
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while (posn < buffer.posn && data[posn] != '\n')
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posn++;
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if (data[posn] == '\n') {
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int okay = 0;
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int serverlen = 0;
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struct alt_base *newalt;
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char *target = NULL;
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if (data[i] == '/') {
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serverlen = strchr(base + 8, '/') - base;
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okay = 1;
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} else if (!memcmp(data + i, "../", 3)) {
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i += 3;
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serverlen = strlen(base);
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while (i + 2 < posn &&
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!memcmp(data + i, "../", 3)) {
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do {
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serverlen--;
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} while (serverlen &&
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base[serverlen - 1] != '/');
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i += 3;
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}
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// If the server got removed, give up.
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okay = strchr(base, ':') - base + 3 <
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serverlen;
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} else if (http_specific) {
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char *colon = strchr(data + i, ':');
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char *slash = strchr(data + i, '/');
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if (colon && slash && colon < data + posn &&
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slash < data + posn && colon < slash) {
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okay = 1;
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}
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}
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// skip 'objects' at end
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if (okay) {
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target = xmalloc(serverlen + posn - i - 6);
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strncpy(target, base, serverlen);
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strncpy(target + serverlen, data + i,
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posn - i - 7);
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target[serverlen + posn - i - 7] = '\0';
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if (get_verbosely)
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fprintf(stderr,
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"Also look at %s\n", target);
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newalt = xmalloc(sizeof(*newalt));
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newalt->next = alt;
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newalt->base = target;
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newalt->got_indices = 0;
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newalt->packs = NULL;
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alt = newalt;
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ret++;
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}
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}
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i = posn + 1;
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}
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got_alternates = 1;
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return ret;
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}
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static int fetch_indices(struct alt_base *repo)
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{
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unsigned char sha1[20];
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char *url;
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struct buffer buffer;
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char *data;
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int i = 0;
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if (repo->got_indices)
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return 0;
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data = xmalloc(4096);
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buffer.size = 4096;
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buffer.posn = 0;
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buffer.buffer = data;
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if (get_verbosely)
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fprintf(stderr, "Getting pack list\n");
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url = xmalloc(strlen(repo->base) + 21);
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sprintf(url, "%s/objects/info/packs", repo->base);
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curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
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curl_easy_setopt(curl, CURLOPT_URL, url);
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curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
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if (curl_easy_perform(curl)) {
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return -1;
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}
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while (i < buffer.posn) {
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switch (data[i]) {
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case 'P':
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i++;
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if (i + 52 < buffer.posn &&
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!strncmp(data + i, " pack-", 6) &&
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!strncmp(data + i + 46, ".pack\n", 6)) {
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get_sha1_hex(data + i + 6, sha1);
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setup_index(repo, sha1);
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i += 51;
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break;
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}
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default:
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while (data[i] != '\n')
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i++;
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}
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i++;
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}
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repo->got_indices = 1;
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return 0;
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}
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static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
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{
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char *url;
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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 *filename;
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if (fetch_indices(repo))
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return -1;
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target = find_sha1_pack(sha1, repo->packs);
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if (!target)
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return -1;
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if (get_verbosely) {
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fprintf(stderr, "Getting pack %s\n",
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sha1_to_hex(target->sha1));
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fprintf(stderr, " which contains %s\n",
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sha1_to_hex(sha1));
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}
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url = xmalloc(strlen(repo->base) + 65);
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sprintf(url, "%s/objects/pack/pack-%s.pack",
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repo->base, sha1_to_hex(target->sha1));
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filename = sha1_pack_name(target->sha1);
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packfile = fopen(filename, "w");
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if (!packfile)
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return error("Unable to open local file %s for pack",
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filename);
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curl_easy_setopt(curl, CURLOPT_FILE, packfile);
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
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curl_easy_setopt(curl, CURLOPT_URL, url);
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curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
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if (curl_easy_perform(curl)) {
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fclose(packfile);
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return error("Unable to get pack file %s", url);
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}
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fclose(packfile);
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lst = &repo->packs;
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while (*lst != target)
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lst = &((*lst)->next);
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*lst = (*lst)->next;
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install_packed_git(target);
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return 0;
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}
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int fetch_object(struct alt_base *repo, unsigned char *sha1)
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{
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char *hex = sha1_to_hex(sha1);
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char *filename = sha1_file_name(sha1);
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unsigned char real_sha1[20];
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char tmpfile[PATH_MAX];
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int ret;
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char *url;
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char *posn;
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snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX",
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get_object_directory());
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local = mkstemp(tmpfile);
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if (local < 0)
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return error("Couldn't create temporary file %s for %s: %s\n",
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tmpfile, filename, strerror(errno));
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memset(&stream, 0, sizeof(stream));
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inflateInit(&stream);
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SHA1_Init(&c);
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curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
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curl_easy_setopt(curl, CURLOPT_FILE, NULL);
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
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curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
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url = xmalloc(strlen(repo->base) + 50);
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strcpy(url, repo->base);
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posn = url + strlen(repo->base);
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strcpy(posn, "objects/");
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posn += 8;
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memcpy(posn, hex, 2);
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posn += 2;
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*(posn++) = '/';
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strcpy(posn, hex + 2);
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curl_easy_setopt(curl, CURLOPT_URL, url);
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if (curl_easy_perform(curl)) {
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unlink(filename);
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return -1;
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}
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fchmod(local, 0444);
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close(local);
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inflateEnd(&stream);
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SHA1_Final(real_sha1, &c);
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if (zret != Z_STREAM_END) {
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unlink(tmpfile);
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return error("File %s (%s) corrupt\n", hex, url);
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}
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if (memcmp(sha1, real_sha1, 20)) {
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unlink(tmpfile);
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return error("File %s has bad hash\n", hex);
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}
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ret = link(tmpfile, filename);
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if (ret < 0) {
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/* Same Coda hack as in write_sha1_file(sha1_file.c) */
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ret = errno;
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if (ret == EXDEV && !rename(tmpfile, filename))
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goto out;
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}
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unlink(tmpfile);
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if (ret) {
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if (ret != EEXIST)
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return error("unable to write sha1 filename %s: %s",
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filename, strerror(ret));
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}
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out:
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pull_say("got %s\n", hex);
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return 0;
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}
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int fetch(unsigned char *sha1)
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{
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struct alt_base *altbase = alt;
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while (altbase) {
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if (!fetch_object(altbase, sha1))
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return 0;
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if (!fetch_pack(altbase, sha1))
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return 0;
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if (fetch_alternates(altbase->base) > 0) {
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altbase = alt;
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continue;
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}
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altbase = altbase->next;
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}
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return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
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initial_base);
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}
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int fetch_ref(char *ref, unsigned char *sha1)
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{
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char *url, *posn;
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char hex[42];
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struct buffer buffer;
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char *base = initial_base;
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buffer.size = 41;
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buffer.posn = 0;
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buffer.buffer = hex;
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hex[41] = '\0';
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curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
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curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
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url = xmalloc(strlen(base) + 6 + strlen(ref));
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strcpy(url, base);
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posn = url + strlen(base);
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strcpy(posn, "refs/");
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posn += 5;
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strcpy(posn, ref);
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curl_easy_setopt(curl, CURLOPT_URL, url);
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if (curl_easy_perform(curl))
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return error("Couldn't get %s for %s\n", url, ref);
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hex[40] = '\0';
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get_sha1_hex(hex, sha1);
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return 0;
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}
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int main(int argc, char **argv)
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{
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char *commit_id;
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char *url;
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int arg = 1;
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while (arg < argc && argv[arg][0] == '-') {
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if (argv[arg][1] == 't') {
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get_tree = 1;
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} else if (argv[arg][1] == 'c') {
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get_history = 1;
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} else if (argv[arg][1] == 'a') {
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get_all = 1;
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get_tree = 1;
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get_history = 1;
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} else if (argv[arg][1] == 'v') {
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get_verbosely = 1;
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} else if (argv[arg][1] == 'w') {
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write_ref = argv[arg + 1];
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arg++;
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}
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arg++;
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}
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if (argc < arg + 2) {
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usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
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return 1;
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}
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commit_id = argv[arg];
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url = argv[arg + 1];
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curl_global_init(CURL_GLOBAL_ALL);
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curl = curl_easy_init();
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no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
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curl_ssl_verify = getenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
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curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
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#if LIBCURL_VERSION_NUM >= 0x070907
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curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
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#endif
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alt = xmalloc(sizeof(*alt));
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alt->base = url;
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alt->got_indices = 0;
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alt->packs = NULL;
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alt->next = NULL;
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initial_base = url;
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if (pull(commit_id))
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return 1;
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curl_slist_free_all(no_pragma_header);
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curl_global_cleanup();
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return 0;
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}
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