diff options
Diffstat (limited to 'http-pull.c')
| -rw-r--r-- | http-pull.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/http-pull.c b/http-pull.c new file mode 100644 index 0000000..a172257 --- /dev/null +++ b/http-pull.c @@ -0,0 +1,204 @@ +#include <fcntl.h> +#include <unistd.h> +#include <string.h> +#include <stdlib.h> +#include "cache.h" +#include "commit.h" +#include <errno.h> +#include <stdio.h> + +#include <curl/curl.h> +#include <curl/easy.h> + +static CURL *curl; + +static char *base; + +static int tree = 0; +static int commits = 0; +static int all = 0; + +static SHA_CTX c; +static z_stream stream; + +static int local; +static int zret; + +static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb, + void *data) { + 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; +} + +static int fetch(unsigned char *sha1) +{ + char *hex = sha1_to_hex(sha1); + char *filename = sha1_file_name(sha1); + char real_sha1[20]; + char *url; + char *posn; + + if (has_sha1_file(sha1)) { + return 0; + } + + local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666); + + if (local < 0) + return error("Couldn't open %s\n", filename); + + memset(&stream, 0, sizeof(stream)); + + inflateInit(&stream); + + SHA1_Init(&c); + + curl_easy_setopt(curl, CURLOPT_FILE, NULL); + curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file); + + url = malloc(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); + + /*printf("Getting %s\n", hex);*/ + + if (curl_easy_perform(curl)) + return error("Couldn't get %s for %s\n", url, hex); + + 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); + } + + return 0; +} + +static int process_tree(unsigned char *sha1) +{ + struct tree *tree = lookup_tree(sha1); + struct tree_entry_list *entries; + + if (parse_tree(tree)) + return -1; + + for (entries = tree->entries; entries; entries = entries->next) { + if (fetch(entries->item.tree->object.sha1)) + return -1; + if (entries->directory) { + if (process_tree(entries->item.tree->object.sha1)) + return -1; + } + } + return 0; +} + +static int process_commit(unsigned char *sha1) +{ + struct commit *obj = lookup_commit(sha1); + + if (fetch(sha1)) + return -1; + + if (parse_commit(obj)) + return -1; + + if (tree) { + if (fetch(obj->tree->object.sha1)) + return -1; + if (process_tree(obj->tree->object.sha1)) + return -1; + if (!all) + tree = 0; + } + if (commits) { + struct commit_list *parents = obj->parents; + for (; parents; parents = parents->next) { + if (has_sha1_file(parents->item->object.sha1)) + continue; + if (fetch(parents->item->object.sha1)) { + /* The server might not have it, and + * we don't mind. + */ + continue; + } + if (process_commit(parents->item->object.sha1)) + return -1; + } + } + return 0; +} + +int main(int argc, char **argv) +{ + char *commit_id; + char *url; + int arg = 1; + unsigned char sha1[20]; + + while (arg < argc && argv[arg][0] == '-') { + if (argv[arg][1] == 't') { + tree = 1; + } else if (argv[arg][1] == 'c') { + commits = 1; + } else if (argv[arg][1] == 'a') { + all = 1; + tree = 1; + commits = 1; + } + arg++; + } + if (argc < arg + 2) { + usage("http-pull [-c] [-t] [-a] commit-id url"); + return 1; + } + commit_id = argv[arg]; + url = argv[arg + 1]; + + get_sha1_hex(commit_id, sha1); + + curl_global_init(CURL_GLOBAL_ALL); + + curl = curl_easy_init(); + + base = url; + + if (fetch(sha1)) + return 1; + if (process_commit(sha1)) + return 1; + + curl_global_cleanup(); + return 0; +} |