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path: root/http-pull.c
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#include "cache.h"
#include "commit.h"
 
#include "pull.h"
 
#include <curl/curl.h>
#include <curl/easy.h>
 
static CURL *curl;
 
static char *base;
 
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) {
	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;
}
 
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 %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 = 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))
		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);
	}
 
	pull_say("got %s\n", hex);
	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] == 'd') {
			get_delta = 0;
		} else if (argv[arg][1] == 'a') {
			get_all = 1;
			get_tree = 1;
			get_history = 1;
		} else if (argv[arg][1] == 'v') {
			get_verbosely = 1;
		}
		arg++;
	}
	if (argc < arg + 2) {
		usage("git-http-pull [-c] [-t] [-a] [-d] [-v] commit-id url");
		return 1;
	}
	commit_id = argv[arg];
	url = argv[arg + 1];
 
	curl_global_init(CURL_GLOBAL_ALL);
 
	curl = curl_easy_init();
 
	base = url;
 
	if (pull(commit_id))
		return 1;
 
	curl_global_cleanup();
	return 0;
}