[thirdparty/git.git] / http-fetch.c

#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 struct curl_slist *no_pragma_header;
static char curl_errorstr[CURL_ERROR_SIZE];

static char *initial_base;

struct alt_base
{
	char *base;
	int got_indices;
	struct packed_git *packs;
	struct alt_base *next;
};

static struct alt_base *alt = NULL;

static SHA_CTX c;
static z_stream stream;

static int local;
static int zret;

static int curl_ssl_verify;
static char *ssl_cert;
static char *ssl_key;
static char *ssl_capath;
static char *ssl_cainfo;

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_alternates = 0;

static int fetch_index(struct alt_base *repo, 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(repo->base) + 64);
	sprintf(url, "%s/objects/pack/pack-%s.idx",
		repo->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);
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
	
	if (curl_easy_perform(curl)) {
		fclose(indexfile);
		return error("Unable to get pack index %s\n%s", url,
			     curl_errorstr);
	}

	fclose(indexfile);
	return 0;
}

static int setup_index(struct alt_base *repo, 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(repo, sha1))
		return -1;

	new_pack = parse_pack_index(sha1);
	new_pack->next = repo->packs;
	repo->packs = new_pack;
	return 0;
}

static int fetch_alternates(char *base)
{
	int ret = 0;
	struct buffer buffer;
	char *url;
	char *data;
	int i = 0;
	int http_specific = 1;
	if (got_alternates)
		return 0;
	data = xmalloc(4096);
	buffer.size = 4095;
	buffer.posn = 0;
	buffer.buffer = data;

	if (get_verbosely)
		fprintf(stderr, "Getting alternates list\n");
	
	url = xmalloc(strlen(base) + 31);
	sprintf(url, "%s/objects/info/http-alternates", 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) || !buffer.posn) {
		http_specific = 0;

		sprintf(url, "%s/objects/info/alternates", 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 0;
		}
	}

	data[buffer.posn] = '\0';

	while (i < buffer.posn) {
		int posn = i;
		while (posn < buffer.posn && data[posn] != '\n')
			posn++;
		if (data[posn] == '\n') {
			int okay = 0;
			int serverlen = 0;
			struct alt_base *newalt;
			char *target = NULL;
			if (data[i] == '/') {
				serverlen = strchr(base + 8, '/') - base;
				okay = 1;
			} else if (!memcmp(data + i, "../", 3)) {
				i += 3;
				serverlen = strlen(base);
				while (i + 2 < posn && 
				       !memcmp(data + i, "../", 3)) {
					do {
						serverlen--;
					} while (serverlen &&
						 base[serverlen - 1] != '/');
					i += 3;
				}
				// If the server got removed, give up.
				okay = strchr(base, ':') - base + 3 < 
					serverlen;
			} else if (http_specific) {
				char *colon = strchr(data + i, ':');
				char *slash = strchr(data + i, '/');
				if (colon && slash && colon < data + posn &&
				    slash < data + posn && colon < slash) {
					okay = 1;
				}
			}
			// skip 'objects' at end
			if (okay) {
				target = xmalloc(serverlen + posn - i - 6);
				strncpy(target, base, serverlen);
				strncpy(target + serverlen, data + i,
					posn - i - 7);
				target[serverlen + posn - i - 7] = '\0';
				if (get_verbosely)
					fprintf(stderr, 
						"Also look at %s\n", target);
				newalt = xmalloc(sizeof(*newalt));
				newalt->next = alt;
				newalt->base = target;
				newalt->got_indices = 0;
				newalt->packs = NULL;
				alt = newalt;
				ret++;
			}
		}
		i = posn + 1;
	}
	got_alternates = 1;
	
	return ret;
}

static int fetch_indices(struct alt_base *repo)
{
	unsigned char sha1[20];
	char *url;
	struct buffer buffer;
	char *data;
	int i = 0;

	if (repo->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(repo->base) + 21);
	sprintf(url, "%s/objects/info/packs", repo->base);

	curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
	curl_easy_setopt(curl, CURLOPT_URL, url);
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
	
	if (curl_easy_perform(curl))
		return error("%s", curl_errorstr);

	while (i < buffer.posn) {
		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(repo, sha1);
				i += 51;
				break;
			}
		default:
			while (data[i] != '\n')
				i++;
		}
		i++;
	}

	repo->got_indices = 1;
	return 0;
}

static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
{
	char *url;
	struct packed_git *target;
	struct packed_git **lst;
	FILE *packfile;
	char *filename;

	if (fetch_indices(repo))
		return -1;
	target = find_sha1_pack(sha1, repo->packs);
	if (!target)
		return -1;

	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(repo->base) + 65);
	sprintf(url, "%s/objects/pack/pack-%s.pack",
		repo->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);
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);

	if (curl_easy_perform(curl)) {
		fclose(packfile);
		return error("Unable to get pack file %s\n%s", url,
			     curl_errorstr);
	}

	fclose(packfile);

	lst = &repo->packs;
	while (*lst != target)
		lst = &((*lst)->next);
	*lst = (*lst)->next;

	install_packed_git(target);

	return 0;
}

static int fetch_object(struct alt_base *repo, unsigned char *sha1)
{
	char *hex = sha1_to_hex(sha1);
	char *filename = sha1_file_name(sha1);
	unsigned char real_sha1[20];
	char tmpfile[PATH_MAX];
	int ret;
	char *url;
	char *posn;

	snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX",
		 get_object_directory());

	local = mkstemp(tmpfile);
	if (local < 0)
		return error("Couldn't create temporary file %s for %s: %s\n",
			     tmpfile, filename, strerror(errno));

	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);
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);

	url = xmalloc(strlen(repo->base) + 50);
	strcpy(url, repo->base);
	posn = url + strlen(repo->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);
		return error("%s", curl_errorstr);
	}

	fchmod(local, 0444);
	close(local);
	inflateEnd(&stream);
	SHA1_Final(real_sha1, &c);
	if (zret != Z_STREAM_END) {
		unlink(tmpfile);
		return error("File %s (%s) corrupt\n", hex, url);
	}
	if (memcmp(sha1, real_sha1, 20)) {
		unlink(tmpfile);
		return error("File %s has bad hash\n", hex);
	}
	ret = link(tmpfile, filename);
	if (ret < 0) {
		/* Same Coda hack as in write_sha1_file(sha1_file.c) */
		ret = errno;
		if (ret == EXDEV && !rename(tmpfile, filename))
			goto out;
	}
	unlink(tmpfile);
	if (ret) {
		if (ret != EEXIST)
			return error("unable to write sha1 filename %s: %s",
				     filename, strerror(ret));
	}
 out:
	pull_say("got %s\n", hex);
	return 0;
}

int fetch(unsigned char *sha1)
{
	struct alt_base *altbase = alt;
	while (altbase) {
		if (!fetch_object(altbase, sha1))
			return 0;
		if (!fetch_pack(altbase, sha1))
			return 0;
		if (fetch_alternates(altbase->base) > 0) {
			altbase = alt;
			continue;
		}
		altbase = altbase->next;
	}
	return error("Unable to find %s under %s\n", sha1_to_hex(sha1), 
		     initial_base);
}

int fetch_ref(char *ref, unsigned char *sha1)
{
        char *url, *posn;
        char hex[42];
        struct buffer buffer;
	char *base = initial_base;
        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);
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);

        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%s",
			     url, ref, curl_errorstr);

        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++;
		} else if (!strcmp(argv[arg], "--recover")) {
			get_recover = 1;
		}
		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();
	no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");

	curl_ssl_verify = getenv("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

	if ((ssl_cert = getenv("GIT_SSL_CERT")) != NULL) {
		curl_easy_setopt(curl, CURLOPT_SSLCERT, ssl_cert);
	}
#if LIBCURL_VERSION_NUM >= 0x070902
	if ((ssl_key = getenv("GIT_SSL_KEY")) != NULL) {
		curl_easy_setopt(curl, CURLOPT_SSLKEY, ssl_key);
	}
#endif
#if LIBCURL_VERSION_NUM >= 0x070908
	if ((ssl_capath = getenv("GIT_SSL_CAPATH")) != NULL) {
		curl_easy_setopt(curl, CURLOPT_CAPATH, ssl_capath);
	}
#endif
	if ((ssl_cainfo = getenv("GIT_SSL_CAINFO")) != NULL) {
		curl_easy_setopt(curl, CURLOPT_CAINFO, ssl_cainfo);
	}

	alt = xmalloc(sizeof(*alt));
	alt->base = url;
	alt->got_indices = 0;
	alt->packs = NULL;
	alt->next = NULL;
	initial_base = url;

	if (pull(commit_id))
		return 1;

	curl_slist_free_all(no_pragma_header);
	curl_global_cleanup();
	return 0;
}
Commit	Line	Data
6eb7ed54 DB	1	#include "cache.h"
6eb7ed54 DB	2	#include "commit.h"
6eb7ed54	3
215a7ad1	4	#include "fetch.h"
4250a5e5	5
6eb7ed54 DB	6	#include <curl/curl.h>
	7	#include <curl/easy.h>
	8
4a30976e JS	9	#if LIBCURL_VERSION_NUM < 0x070704
	10	#define curl_global_cleanup() do { /* nothing */ } while(0)
	11	#endif
	12	#if LIBCURL_VERSION_NUM < 0x070800
	13	#define curl_global_init(a) do { /* nothing */ } while(0)
	14	#endif
4a30976e	15
6eb7ed54	16	static CURL *curl;
1db69b57	17	static struct curl_slist *no_pragma_header;
1ddea77e	18	static char curl_errorstr[CURL_ERROR_SIZE];
6eb7ed54	19
b3661567 DB	20	static char *initial_base;
	21
	22	struct alt_base
	23	{
	24	char *base;
	25	int got_indices;
	26	struct packed_git *packs;
	27	struct alt_base *next;
	28	};
	29
a7928f8e	30	static struct alt_base *alt = NULL;
6eb7ed54	31
6eb7ed54 DB	32	static SHA_CTX c;
	33	static z_stream stream;
	34
	35	static int local;
	36	static int zret;
	37
3dcb90f5	38	static int curl_ssl_verify;
5acb6de1 NH	39	static char *ssl_cert;
	40	static char *ssl_key;
	41	static char *ssl_capath;
	42	static char *ssl_cainfo;
3dcb90f5	43
fa3e0655 DB	44	struct buffer
	45	{
	46	size_t posn;
	47	size_t size;
	48	void *buffer;
	49	};
	50
	51	static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
182005b9 DB	52	struct buffer *buffer)
182005b9 DB	53	{
fa3e0655 DB	54	size_t size = eltsize * nmemb;
	55	if (size > buffer->size - buffer->posn)
	56	size = buffer->size - buffer->posn;
	57	memcpy(buffer->buffer + buffer->posn, ptr, size);
	58	buffer->posn += size;
	59	return size;
	60	}
	61
182005b9 DB	62	static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
	63	void *data)
	64	{
bf0f910d	65	unsigned char expn[4096];
6eb7ed54 DB	66	size_t size = eltsize * nmemb;
	67	int posn = 0;
	68	do {
	69	ssize_t retval = write(local, ptr + posn, size - posn);
	70	if (retval < 0)
	71	return posn;
	72	posn += retval;
	73	} while (posn < size);
	74
	75	stream.avail_in = size;
	76	stream.next_in = ptr;
	77	do {
	78	stream.next_out = expn;
	79	stream.avail_out = sizeof(expn);
	80	zret = inflate(&stream, Z_SYNC_FLUSH);
	81	SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
	82	} while (stream.avail_in && zret == Z_OK);
	83	return size;
	84	}
	85
1e8be59d DB	86	void prefetch(unsigned char *sha1)
	87	{
	88	}
	89
b3661567	90	static int got_alternates = 0;
182005b9	91
b3661567	92	static int fetch_index(struct alt_base repo, unsigned char sha1)
182005b9 DB	93	{
	94	char *filename;
	95	char *url;
	96
	97	FILE *indexfile;
	98
	99	if (has_pack_index(sha1))
	100	return 0;
	101
	102	if (get_verbosely)
	103	fprintf(stderr, "Getting index for pack %s\n",
	104	sha1_to_hex(sha1));
	105
b3661567	106	url = xmalloc(strlen(repo->base) + 64);
182005b9	107	sprintf(url, "%s/objects/pack/pack-%s.idx",
b3661567	108	repo->base, sha1_to_hex(sha1));
182005b9 DB	109
	110	filename = sha1_pack_index_name(sha1);
	111	indexfile = fopen(filename, "w");
	112	if (!indexfile)
	113	return error("Unable to open local file %s for pack index",
	114	filename);
	115
	116	curl_easy_setopt(curl, CURLOPT_FILE, indexfile);
	117	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
	118	curl_easy_setopt(curl, CURLOPT_URL, url);
1db69b57	119	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
1ddea77e	120	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
182005b9 DB	121
	122	if (curl_easy_perform(curl)) {
	123	fclose(indexfile);
1ddea77e NH	124	return error("Unable to get pack index %s\n%s", url,
1ddea77e NH	125	curl_errorstr);
182005b9 DB	126	}
	127
	128	fclose(indexfile);
	129	return 0;
	130	}
	131
b3661567	132	static int setup_index(struct alt_base repo, unsigned char sha1)
182005b9 DB	133	{
	134	struct packed_git *new_pack;
	135	if (has_pack_file(sha1))
	136	return 0; // don't list this as something we can get
	137
b3661567	138	if (fetch_index(repo, sha1))
182005b9 DB	139	return -1;
	140
	141	new_pack = parse_pack_index(sha1);
b3661567 DB	142	new_pack->next = repo->packs;
b3661567 DB	143	repo->packs = new_pack;
182005b9 DB	144	return 0;
	145	}
	146
b3661567 DB	147	static int fetch_alternates(char *base)
	148	{
	149	int ret = 0;
	150	struct buffer buffer;
	151	char *url;
	152	char *data;
	153	int i = 0;
1b0c1e67	154	int http_specific = 1;
b3661567 DB	155	if (got_alternates)
	156	return 0;
	157	data = xmalloc(4096);
1b0c1e67	158	buffer.size = 4095;
b3661567 DB	159	buffer.posn = 0;
	160	buffer.buffer = data;
	161
	162	if (get_verbosely)
	163	fprintf(stderr, "Getting alternates list\n");
	164
	165	url = xmalloc(strlen(base) + 31);
	166	sprintf(url, "%s/objects/info/http-alternates", base);
	167
	168	curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
	169	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
	170	curl_easy_setopt(curl, CURLOPT_URL, url);
	171
	172	if (curl_easy_perform(curl) \|\| !buffer.posn) {
1b0c1e67 DB	173	http_specific = 0;
1b0c1e67 DB	174
b3661567 DB	175	sprintf(url, "%s/objects/info/alternates", base);
	176
	177	curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
	178	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
	179	curl_easy_setopt(curl, CURLOPT_URL, url);
	180
	181	if (curl_easy_perform(curl)) {
	182	return 0;
	183	}
	184	}
	185
1b0c1e67 DB	186	data[buffer.posn] = '\0';
1b0c1e67 DB	187
b3661567 DB	188	while (i < buffer.posn) {
	189	int posn = i;
	190	while (posn < buffer.posn && data[posn] != '\n')
	191	posn++;
	192	if (data[posn] == '\n') {
1b0c1e67 DB	193	int okay = 0;
	194	int serverlen = 0;
	195	struct alt_base *newalt;
	196	char *target = NULL;
b3661567	197	if (data[i] == '/') {
1b0c1e67 DB	198	serverlen = strchr(base + 8, '/') - base;
	199	okay = 1;
	200	} else if (!memcmp(data + i, "../", 3)) {
	201	i += 3;
	202	serverlen = strlen(base);
	203	while (i + 2 < posn &&
	204	!memcmp(data + i, "../", 3)) {
	205	do {
	206	serverlen--;
	207	} while (serverlen &&
	208	base[serverlen - 1] != '/');
	209	i += 3;
	210	}
	211	// If the server got removed, give up.
	212	okay = strchr(base, ':') - base + 3 <
	213	serverlen;
	214	} else if (http_specific) {
	215	char *colon = strchr(data + i, ':');
	216	char *slash = strchr(data + i, '/');
	217	if (colon && slash && colon < data + posn &&
	218	slash < data + posn && colon < slash) {
	219	okay = 1;
	220	}
	221	}
	222	// skip 'objects' at end
	223	if (okay) {
	224	target = xmalloc(serverlen + posn - i - 6);
b3661567 DB	225	strncpy(target, base, serverlen);
	226	strncpy(target + serverlen, data + i,
	227	posn - i - 7);
	228	target[serverlen + posn - i - 7] = '\0';
	229	if (get_verbosely)
	230	fprintf(stderr,
	231	"Also look at %s\n", target);
	232	newalt = xmalloc(sizeof(*newalt));
	233	newalt->next = alt;
	234	newalt->base = target;
	235	newalt->got_indices = 0;
	236	newalt->packs = NULL;
	237	alt = newalt;
	238	ret++;
	239	}
	240	}
	241	i = posn + 1;
	242	}
	243	got_alternates = 1;
	244
	245	return ret;
	246	}
	247
	248	static int fetch_indices(struct alt_base *repo)
182005b9 DB	249	{
	250	unsigned char sha1[20];
	251	char *url;
	252	struct buffer buffer;
	253	char *data;
	254	int i = 0;
	255
b3661567	256	if (repo->got_indices)
182005b9 DB	257	return 0;
	258
	259	data = xmalloc(4096);
	260	buffer.size = 4096;
	261	buffer.posn = 0;
	262	buffer.buffer = data;
	263
	264	if (get_verbosely)
	265	fprintf(stderr, "Getting pack list\n");
	266
b3661567 DB	267	url = xmalloc(strlen(repo->base) + 21);
b3661567 DB	268	sprintf(url, "%s/objects/info/packs", repo->base);
182005b9 DB	269
	270	curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
	271	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
	272	curl_easy_setopt(curl, CURLOPT_URL, url);
1db69b57	273	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
1ddea77e	274	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
182005b9	275
1ddea77e NH	276	if (curl_easy_perform(curl))
1ddea77e NH	277	return error("%s", curl_errorstr);
182005b9	278
b3661567	279	while (i < buffer.posn) {
182005b9 DB	280	switch (data[i]) {
	281	case 'P':
	282	i++;
	283	if (i + 52 < buffer.posn &&
	284	!strncmp(data + i, " pack-", 6) &&
	285	!strncmp(data + i + 46, ".pack\n", 6)) {
	286	get_sha1_hex(data + i + 6, sha1);
b3661567	287	setup_index(repo, sha1);
182005b9 DB	288	i += 51;
	289	break;
	290	}
	291	default:
	292	while (data[i] != '\n')
	293	i++;
	294	}
	295	i++;
b3661567	296	}
182005b9	297
b3661567	298	repo->got_indices = 1;
182005b9 DB	299	return 0;
	300	}
	301
b3661567	302	static int fetch_pack(struct alt_base repo, unsigned char sha1)
182005b9 DB	303	{
	304	char *url;
	305	struct packed_git *target;
	306	struct packed_git **lst;
	307	FILE *packfile;
	308	char *filename;
	309
b3661567	310	if (fetch_indices(repo))
182005b9	311	return -1;
b3661567	312	target = find_sha1_pack(sha1, repo->packs);
182005b9	313	if (!target)
b3661567	314	return -1;
182005b9 DB	315
	316	if (get_verbosely) {
	317	fprintf(stderr, "Getting pack %s\n",
	318	sha1_to_hex(target->sha1));
	319	fprintf(stderr, " which contains %s\n",
	320	sha1_to_hex(sha1));
	321	}
	322
b3661567	323	url = xmalloc(strlen(repo->base) + 65);
182005b9	324	sprintf(url, "%s/objects/pack/pack-%s.pack",
b3661567	325	repo->base, sha1_to_hex(target->sha1));
182005b9 DB	326
	327	filename = sha1_pack_name(target->sha1);
	328	packfile = fopen(filename, "w");
	329	if (!packfile)
	330	return error("Unable to open local file %s for pack",
	331	filename);
	332
	333	curl_easy_setopt(curl, CURLOPT_FILE, packfile);
	334	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
	335	curl_easy_setopt(curl, CURLOPT_URL, url);
1db69b57	336	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
1ddea77e NH	337	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1ddea77e NH	338
182005b9 DB	339	if (curl_easy_perform(curl)) {
182005b9 DB	340	fclose(packfile);
1ddea77e NH	341	return error("Unable to get pack file %s\n%s", url,
1ddea77e NH	342	curl_errorstr);
182005b9 DB	343	}
	344
	345	fclose(packfile);
	346
b3661567	347	lst = &repo->packs;
182005b9 DB	348	while (*lst != target)
	349	lst = &((*lst)->next);
	350	lst = (lst)->next;
	351
	352	install_packed_git(target);
	353
	354	return 0;
	355	}
	356
a7928f8e	357	static int fetch_object(struct alt_base repo, unsigned char sha1)
6eb7ed54 DB	358	{
	359	char *hex = sha1_to_hex(sha1);
	360	char *filename = sha1_file_name(sha1);
bf0f910d	361	unsigned char real_sha1[20];
09d92083 JH	362	char tmpfile[PATH_MAX];
09d92083 JH	363	int ret;
6eb7ed54 DB	364	char *url;
	365	char *posn;
	366
09d92083 JH	367	snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX",
09d92083 JH	368	get_object_directory());
6eb7ed54	369
09d92083	370	local = mkstemp(tmpfile);
6eb7ed54	371	if (local < 0)
09d92083 JH	372	return error("Couldn't create temporary file %s for %s: %s\n",
09d92083 JH	373	tmpfile, filename, strerror(errno));
6eb7ed54 DB	374
	375	memset(&stream, 0, sizeof(stream));
	376
	377	inflateInit(&stream);
	378
	379	SHA1_Init(&c);
	380
182005b9	381	curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
6eb7ed54 DB	382	curl_easy_setopt(curl, CURLOPT_FILE, NULL);
6eb7ed54 DB	383	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1db69b57	384	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
1ddea77e	385	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
6eb7ed54	386
b3661567 DB	387	url = xmalloc(strlen(repo->base) + 50);
	388	strcpy(url, repo->base);
	389	posn = url + strlen(repo->base);
6eb7ed54 DB	390	strcpy(posn, "objects/");
	391	posn += 8;
	392	memcpy(posn, hex, 2);
	393	posn += 2;
	394	*(posn++) = '/';
	395	strcpy(posn, hex + 2);
	396
	397	curl_easy_setopt(curl, CURLOPT_URL, url);
	398
182005b9 DB	399	if (curl_easy_perform(curl)) {
182005b9 DB	400	unlink(filename);
1ddea77e	401	return error("%s", curl_errorstr);
182005b9	402	}
6eb7ed54	403
09d92083	404	fchmod(local, 0444);
6eb7ed54 DB	405	close(local);
	406	inflateEnd(&stream);
	407	SHA1_Final(real_sha1, &c);
	408	if (zret != Z_STREAM_END) {
09d92083	409	unlink(tmpfile);
6eb7ed54 DB	410	return error("File %s (%s) corrupt\n", hex, url);
	411	}
	412	if (memcmp(sha1, real_sha1, 20)) {
09d92083	413	unlink(tmpfile);
6eb7ed54 DB	414	return error("File %s has bad hash\n", hex);
6eb7ed54 DB	415	}
09d92083 JH	416	ret = link(tmpfile, filename);
	417	if (ret < 0) {
	418	/* Same Coda hack as in write_sha1_file(sha1_file.c) */
	419	ret = errno;
	420	if (ret == EXDEV && !rename(tmpfile, filename))
	421	goto out;
	422	}
	423	unlink(tmpfile);
	424	if (ret) {
	425	if (ret != EEXIST)
	426	return error("unable to write sha1 filename %s: %s",
	427	filename, strerror(ret));
	428	}
	429	out:
e78d9772	430	pull_say("got %s\n", hex);
6eb7ed54 DB	431	return 0;
	432	}
	433
b3661567 DB	434	int fetch(unsigned char *sha1)
	435	{
	436	struct alt_base *altbase = alt;
	437	while (altbase) {
	438	if (!fetch_object(altbase, sha1))
	439	return 0;
	440	if (!fetch_pack(altbase, sha1))
	441	return 0;
	442	if (fetch_alternates(altbase->base) > 0) {
	443	altbase = alt;
	444	continue;
	445	}
	446	altbase = altbase->next;
	447	}
	448	return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
	449	initial_base);
	450	}
	451
cd541a68 DB	452	int fetch_ref(char ref, unsigned char sha1)
cd541a68 DB	453	{
fa3e0655 DB	454	char url, posn;
	455	char hex[42];
	456	struct buffer buffer;
b3661567	457	char *base = initial_base;
fa3e0655 DB	458	buffer.size = 41;
	459	buffer.posn = 0;
	460	buffer.buffer = hex;
	461	hex[41] = '\0';
	462
	463	curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
	464	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1db69b57	465	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
1ddea77e	466	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
fa3e0655 DB	467
	468	url = xmalloc(strlen(base) + 6 + strlen(ref));
	469	strcpy(url, base);
	470	posn = url + strlen(base);
	471	strcpy(posn, "refs/");
	472	posn += 5;
	473	strcpy(posn, ref);
	474
	475	curl_easy_setopt(curl, CURLOPT_URL, url);
	476
	477	if (curl_easy_perform(curl))
1ddea77e NH	478	return error("Couldn't get %s for %s\n%s",
1ddea77e NH	479	url, ref, curl_errorstr);
fa3e0655 DB	480
	481	hex[40] = '\0';
	482	get_sha1_hex(hex, sha1);
	483	return 0;
cd541a68 DB	484	}
cd541a68 DB	485
6eb7ed54 DB	486	int main(int argc, char **argv)
	487	{
	488	char *commit_id;
	489	char *url;
	490	int arg = 1;
6eb7ed54 DB	491
	492	while (arg < argc && argv[arg][0] == '-') {
	493	if (argv[arg][1] == 't') {
4250a5e5	494	get_tree = 1;
6eb7ed54	495	} else if (argv[arg][1] == 'c') {
4250a5e5	496	get_history = 1;
6eb7ed54	497	} else if (argv[arg][1] == 'a') {
4250a5e5 DB	498	get_all = 1;
	499	get_tree = 1;
	500	get_history = 1;
e78d9772 JH	501	} else if (argv[arg][1] == 'v') {
e78d9772 JH	502	get_verbosely = 1;
fa3e0655 DB	503	} else if (argv[arg][1] == 'w') {
	504	write_ref = argv[arg + 1];
	505	arg++;
820eca68 DB	506	} else if (!strcmp(argv[arg], "--recover")) {
820eca68 DB	507	get_recover = 1;
6eb7ed54 DB	508	}
	509	arg++;
	510	}
	511	if (argc < arg + 2) {
215a7ad1	512	usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
6eb7ed54 DB	513	return 1;
	514	}
	515	commit_id = argv[arg];
	516	url = argv[arg + 1];
	517
6eb7ed54 DB	518	curl_global_init(CURL_GLOBAL_ALL);
	519
	520	curl = curl_easy_init();
1db69b57	521	no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
6eb7ed54	522
a9ab586a	523	curl_ssl_verify = getenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
3dcb90f5	524	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
9f6cf65e	525	#if LIBCURL_VERSION_NUM >= 0x070907
3dcb90f5	526	curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
9f6cf65e	527	#endif
3dcb90f5	528
5acb6de1 NH	529	if ((ssl_cert = getenv("GIT_SSL_CERT")) != NULL) {
	530	curl_easy_setopt(curl, CURLOPT_SSLCERT, ssl_cert);
	531	}
7d167feb	532	#if LIBCURL_VERSION_NUM >= 0x070902
5acb6de1 NH	533	if ((ssl_key = getenv("GIT_SSL_KEY")) != NULL) {
	534	curl_easy_setopt(curl, CURLOPT_SSLKEY, ssl_key);
	535	}
7d167feb	536	#endif
5acb6de1 NH	537	#if LIBCURL_VERSION_NUM >= 0x070908
	538	if ((ssl_capath = getenv("GIT_SSL_CAPATH")) != NULL) {
	539	curl_easy_setopt(curl, CURLOPT_CAPATH, ssl_capath);
	540	}
	541	#endif
	542	if ((ssl_cainfo = getenv("GIT_SSL_CAINFO")) != NULL) {
	543	curl_easy_setopt(curl, CURLOPT_CAINFO, ssl_cainfo);
	544	}
	545
b3661567 DB	546	alt = xmalloc(sizeof(*alt));
	547	alt->base = url;
	548	alt->got_indices = 0;
	549	alt->packs = NULL;
	550	alt->next = NULL;
	551	initial_base = url;
6eb7ed54	552
4250a5e5	553	if (pull(commit_id))
6eb7ed54 DB	554	return 1;
6eb7ed54 DB	555
1db69b57	556	curl_slist_free_all(no_pragma_header);
6eb7ed54 DB	557	curl_global_cleanup();
	558	return 0;
	559	}