[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 *initial_base;

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

struct alt_base *alt = NULL;

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_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);
	
	if (curl_easy_perform(curl)) {
		fclose(indexfile);
		return error("Unable to get pack index %s", url);
	}

	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;
	if (got_alternates)
		return 0;
	data = xmalloc(4096);
	buffer.size = 4096;
	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) {
		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;
		}
	}

	while (i < buffer.posn) {
		int posn = i;
		while (posn < buffer.posn && data[posn] != '\n')
			posn++;
		if (data[posn] == '\n') {
			if (data[i] == '/') {
				int serverlen = strchr(base + 8, '/') - base;
				// skip 'objects' at end
				char *target = 
					xmalloc(serverlen + posn - i - 6);
				struct alt_base *newalt;
				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);
	
	if (curl_easy_perform(curl)) {
		return error("Unable to get pack index %s", url);
	}

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

	fclose(packfile);

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

	install_packed_git(target);

	return 0;
}

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 *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);
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);

	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 -1;
	}

	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(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);

        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();
	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

	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;
6eb7ed54	18
b3661567 DB	19	static char *initial_base;
	20
	21	struct alt_base
	22	{
	23	char *base;
	24	int got_indices;
	25	struct packed_git *packs;
	26	struct alt_base *next;
	27	};
	28
	29	struct alt_base *alt = NULL;
6eb7ed54	30
6eb7ed54 DB	31	static SHA_CTX c;
	32	static z_stream stream;
	33
	34	static int local;
	35	static int zret;
	36
3dcb90f5 DT	37	static int curl_ssl_verify;
3dcb90f5 DT	38
fa3e0655 DB	39	struct buffer
	40	{
	41	size_t posn;
	42	size_t size;
	43	void *buffer;
	44	};
	45
	46	static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
182005b9 DB	47	struct buffer *buffer)
182005b9 DB	48	{
fa3e0655 DB	49	size_t size = eltsize * nmemb;
	50	if (size > buffer->size - buffer->posn)
	51	size = buffer->size - buffer->posn;
	52	memcpy(buffer->buffer + buffer->posn, ptr, size);
	53	buffer->posn += size;
	54	return size;
	55	}
	56
182005b9 DB	57	static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
	58	void *data)
	59	{
bf0f910d	60	unsigned char expn[4096];
6eb7ed54 DB	61	size_t size = eltsize * nmemb;
	62	int posn = 0;
	63	do {
	64	ssize_t retval = write(local, ptr + posn, size - posn);
	65	if (retval < 0)
	66	return posn;
	67	posn += retval;
	68	} while (posn < size);
	69
	70	stream.avail_in = size;
	71	stream.next_in = ptr;
	72	do {
	73	stream.next_out = expn;
	74	stream.avail_out = sizeof(expn);
	75	zret = inflate(&stream, Z_SYNC_FLUSH);
	76	SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
	77	} while (stream.avail_in && zret == Z_OK);
	78	return size;
	79	}
	80
1e8be59d DB	81	void prefetch(unsigned char *sha1)
	82	{
	83	}
	84
b3661567	85	static int got_alternates = 0;
182005b9	86
b3661567	87	static int fetch_index(struct alt_base repo, unsigned char sha1)
182005b9 DB	88	{
	89	char *filename;
	90	char *url;
	91
	92	FILE *indexfile;
	93
	94	if (has_pack_index(sha1))
	95	return 0;
	96
	97	if (get_verbosely)
	98	fprintf(stderr, "Getting index for pack %s\n",
	99	sha1_to_hex(sha1));
	100
b3661567	101	url = xmalloc(strlen(repo->base) + 64);
182005b9	102	sprintf(url, "%s/objects/pack/pack-%s.idx",
b3661567	103	repo->base, sha1_to_hex(sha1));
182005b9 DB	104
	105	filename = sha1_pack_index_name(sha1);
	106	indexfile = fopen(filename, "w");
	107	if (!indexfile)
	108	return error("Unable to open local file %s for pack index",
	109	filename);
	110
	111	curl_easy_setopt(curl, CURLOPT_FILE, indexfile);
	112	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
	113	curl_easy_setopt(curl, CURLOPT_URL, url);
1db69b57	114	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
182005b9 DB	115
	116	if (curl_easy_perform(curl)) {
	117	fclose(indexfile);
	118	return error("Unable to get pack index %s", url);
	119	}
	120
	121	fclose(indexfile);
	122	return 0;
	123	}
	124
b3661567	125	static int setup_index(struct alt_base repo, unsigned char sha1)
182005b9 DB	126	{
	127	struct packed_git *new_pack;
	128	if (has_pack_file(sha1))
	129	return 0; // don't list this as something we can get
	130
b3661567	131	if (fetch_index(repo, sha1))
182005b9 DB	132	return -1;
	133
	134	new_pack = parse_pack_index(sha1);
b3661567 DB	135	new_pack->next = repo->packs;
b3661567 DB	136	repo->packs = new_pack;
182005b9 DB	137	return 0;
	138	}
	139
b3661567 DB	140	static int fetch_alternates(char *base)
	141	{
	142	int ret = 0;
	143	struct buffer buffer;
	144	char *url;
	145	char *data;
	146	int i = 0;
	147	if (got_alternates)
	148	return 0;
	149	data = xmalloc(4096);
	150	buffer.size = 4096;
	151	buffer.posn = 0;
	152	buffer.buffer = data;
	153
	154	if (get_verbosely)
	155	fprintf(stderr, "Getting alternates list\n");
	156
	157	url = xmalloc(strlen(base) + 31);
	158	sprintf(url, "%s/objects/info/http-alternates", base);
	159
	160	curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
	161	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
	162	curl_easy_setopt(curl, CURLOPT_URL, url);
	163
	164	if (curl_easy_perform(curl) \|\| !buffer.posn) {
	165	sprintf(url, "%s/objects/info/alternates", base);
	166
	167	curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
	168	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
	169	curl_easy_setopt(curl, CURLOPT_URL, url);
	170
	171	if (curl_easy_perform(curl)) {
	172	return 0;
	173	}
	174	}
	175
	176	while (i < buffer.posn) {
	177	int posn = i;
	178	while (posn < buffer.posn && data[posn] != '\n')
	179	posn++;
	180	if (data[posn] == '\n') {
	181	if (data[i] == '/') {
	182	int serverlen = strchr(base + 8, '/') - base;
	183	// skip 'objects' at end
	184	char *target =
	185	xmalloc(serverlen + posn - i - 6);
	186	struct alt_base *newalt;
	187	strncpy(target, base, serverlen);
	188	strncpy(target + serverlen, data + i,
	189	posn - i - 7);
	190	target[serverlen + posn - i - 7] = '\0';
	191	if (get_verbosely)
	192	fprintf(stderr,
	193	"Also look at %s\n", target);
	194	newalt = xmalloc(sizeof(*newalt));
	195	newalt->next = alt;
	196	newalt->base = target;
	197	newalt->got_indices = 0;
	198	newalt->packs = NULL;
	199	alt = newalt;
	200	ret++;
	201	}
	202	}
	203	i = posn + 1;
204	}
205	got_alternates = 1;
206
207	return ret;
208	}
209
210	static int fetch_indices(struct alt_base *repo)
182005b9 DB	211	{
	212	unsigned char sha1[20];
	213	char *url;
	214	struct buffer buffer;
	215	char *data;
	216	int i = 0;
	217
b3661567	218	if (repo->got_indices)
182005b9 DB	219	return 0;
	220
	221	data = xmalloc(4096);
	222	buffer.size = 4096;
	223	buffer.posn = 0;
	224	buffer.buffer = data;
	225
	226	if (get_verbosely)
	227	fprintf(stderr, "Getting pack list\n");
	228
b3661567 DB	229	url = xmalloc(strlen(repo->base) + 21);
b3661567 DB	230	sprintf(url, "%s/objects/info/packs", repo->base);
182005b9 DB	231
	232	curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
	233	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
	234	curl_easy_setopt(curl, CURLOPT_URL, url);
1db69b57	235	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
182005b9 DB	236
	237	if (curl_easy_perform(curl)) {
	238	return error("Unable to get pack index %s", url);
	239	}
	240
b3661567	241	while (i < buffer.posn) {
182005b9 DB	242	switch (data[i]) {
	243	case 'P':
	244	i++;
	245	if (i + 52 < buffer.posn &&
	246	!strncmp(data + i, " pack-", 6) &&
	247	!strncmp(data + i + 46, ".pack\n", 6)) {
	248	get_sha1_hex(data + i + 6, sha1);
b3661567	249	setup_index(repo, sha1);
182005b9 DB	250	i += 51;
	251	break;
	252	}
	253	default:
	254	while (data[i] != '\n')
	255	i++;
	256	}
	257	i++;
b3661567	258	}
182005b9	259
b3661567	260	repo->got_indices = 1;
182005b9 DB	261	return 0;
	262	}
	263
b3661567	264	static int fetch_pack(struct alt_base repo, unsigned char sha1)
182005b9 DB	265	{
	266	char *url;
	267	struct packed_git *target;
	268	struct packed_git **lst;
	269	FILE *packfile;
	270	char *filename;
	271
b3661567	272	if (fetch_indices(repo))
182005b9	273	return -1;
b3661567	274	target = find_sha1_pack(sha1, repo->packs);
182005b9	275	if (!target)
b3661567	276	return -1;
182005b9 DB	277
	278	if (get_verbosely) {
	279	fprintf(stderr, "Getting pack %s\n",
	280	sha1_to_hex(target->sha1));
	281	fprintf(stderr, " which contains %s\n",
	282	sha1_to_hex(sha1));
	283	}
	284
b3661567	285	url = xmalloc(strlen(repo->base) + 65);
182005b9	286	sprintf(url, "%s/objects/pack/pack-%s.pack",
b3661567	287	repo->base, sha1_to_hex(target->sha1));
182005b9 DB	288
	289	filename = sha1_pack_name(target->sha1);
	290	packfile = fopen(filename, "w");
	291	if (!packfile)
	292	return error("Unable to open local file %s for pack",
	293	filename);
	294
	295	curl_easy_setopt(curl, CURLOPT_FILE, packfile);
	296	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
	297	curl_easy_setopt(curl, CURLOPT_URL, url);
1db69b57	298	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
182005b9 DB	299
	300	if (curl_easy_perform(curl)) {
	301	fclose(packfile);
	302	return error("Unable to get pack file %s", url);
	303	}
	304
	305	fclose(packfile);
	306
b3661567	307	lst = &repo->packs;
182005b9 DB	308	while (*lst != target)
	309	lst = &((*lst)->next);
	310	lst = (lst)->next;
	311
	312	install_packed_git(target);
	313
	314	return 0;
	315	}
	316
b3661567	317	int fetch_object(struct alt_base repo, unsigned char sha1)
6eb7ed54 DB	318	{
	319	char *hex = sha1_to_hex(sha1);
	320	char *filename = sha1_file_name(sha1);
bf0f910d	321	unsigned char real_sha1[20];
6eb7ed54 DB	322	char *url;
	323	char *posn;
	324
6eb7ed54 DB	325	local = open(filename, O_WRONLY \| O_CREAT \| O_EXCL, 0666);
	326
	327	if (local < 0)
182005b9	328	return error("Couldn't open local object %s\n", filename);
6eb7ed54 DB	329
	330	memset(&stream, 0, sizeof(stream));
	331
	332	inflateInit(&stream);
	333
	334	SHA1_Init(&c);
	335
182005b9	336	curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
6eb7ed54 DB	337	curl_easy_setopt(curl, CURLOPT_FILE, NULL);
6eb7ed54 DB	338	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1db69b57	339	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
6eb7ed54	340
b3661567 DB	341	url = xmalloc(strlen(repo->base) + 50);
	342	strcpy(url, repo->base);
	343	posn = url + strlen(repo->base);
6eb7ed54 DB	344	strcpy(posn, "objects/");
	345	posn += 8;
	346	memcpy(posn, hex, 2);
	347	posn += 2;
	348	*(posn++) = '/';
	349	strcpy(posn, hex + 2);
	350
	351	curl_easy_setopt(curl, CURLOPT_URL, url);
	352
182005b9 DB	353	if (curl_easy_perform(curl)) {
182005b9 DB	354	unlink(filename);
b3661567	355	return -1;
182005b9	356	}
6eb7ed54 DB	357
	358	close(local);
	359	inflateEnd(&stream);
	360	SHA1_Final(real_sha1, &c);
	361	if (zret != Z_STREAM_END) {
	362	unlink(filename);
	363	return error("File %s (%s) corrupt\n", hex, url);
	364	}
	365	if (memcmp(sha1, real_sha1, 20)) {
	366	unlink(filename);
	367	return error("File %s has bad hash\n", hex);
	368	}
	369
e78d9772	370	pull_say("got %s\n", hex);
6eb7ed54 DB	371	return 0;
	372	}
	373
b3661567 DB	374	int fetch(unsigned char *sha1)
	375	{
	376	struct alt_base *altbase = alt;
	377	while (altbase) {
	378	if (!fetch_object(altbase, sha1))
	379	return 0;
	380	if (!fetch_pack(altbase, sha1))
	381	return 0;
	382	if (fetch_alternates(altbase->base) > 0) {
	383	altbase = alt;
	384	continue;
	385	}
	386	altbase = altbase->next;
	387	}
	388	return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
	389	initial_base);
	390	}
	391
cd541a68 DB	392	int fetch_ref(char ref, unsigned char sha1)
cd541a68 DB	393	{
fa3e0655 DB	394	char url, posn;
	395	char hex[42];
	396	struct buffer buffer;
b3661567	397	char *base = initial_base;
fa3e0655 DB	398	buffer.size = 41;
	399	buffer.posn = 0;
	400	buffer.buffer = hex;
	401	hex[41] = '\0';
	402
	403	curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
	404	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1db69b57	405	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
fa3e0655 DB	406
	407	url = xmalloc(strlen(base) + 6 + strlen(ref));
	408	strcpy(url, base);
	409	posn = url + strlen(base);
	410	strcpy(posn, "refs/");
	411	posn += 5;
	412	strcpy(posn, ref);
	413
	414	curl_easy_setopt(curl, CURLOPT_URL, url);
	415
	416	if (curl_easy_perform(curl))
	417	return error("Couldn't get %s for %s\n", url, ref);
	418
	419	hex[40] = '\0';
	420	get_sha1_hex(hex, sha1);
	421	return 0;
cd541a68 DB	422	}
cd541a68 DB	423
6eb7ed54 DB	424	int main(int argc, char **argv)
	425	{
	426	char *commit_id;
	427	char *url;
	428	int arg = 1;
6eb7ed54 DB	429
	430	while (arg < argc && argv[arg][0] == '-') {
	431	if (argv[arg][1] == 't') {
4250a5e5	432	get_tree = 1;
6eb7ed54	433	} else if (argv[arg][1] == 'c') {
4250a5e5	434	get_history = 1;
6eb7ed54	435	} else if (argv[arg][1] == 'a') {
4250a5e5 DB	436	get_all = 1;
	437	get_tree = 1;
	438	get_history = 1;
e78d9772 JH	439	} else if (argv[arg][1] == 'v') {
e78d9772 JH	440	get_verbosely = 1;
fa3e0655 DB	441	} else if (argv[arg][1] == 'w') {
	442	write_ref = argv[arg + 1];
	443	arg++;
6eb7ed54 DB	444	}
	445	arg++;
	446	}
	447	if (argc < arg + 2) {
215a7ad1	448	usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
6eb7ed54 DB	449	return 1;
	450	}
	451	commit_id = argv[arg];
	452	url = argv[arg + 1];
	453
6eb7ed54 DB	454	curl_global_init(CURL_GLOBAL_ALL);
	455
	456	curl = curl_easy_init();
1db69b57	457	no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
6eb7ed54	458
a9ab586a	459	curl_ssl_verify = getenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
3dcb90f5	460	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
9f6cf65e	461	#if LIBCURL_VERSION_NUM >= 0x070907
3dcb90f5	462	curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
9f6cf65e	463	#endif
3dcb90f5	464
b3661567 DB	465	alt = xmalloc(sizeof(*alt));
	466	alt->base = url;
	467	alt->got_indices = 0;
	468	alt->packs = NULL;
	469	alt->next = NULL;
	470	initial_base = url;
6eb7ed54	471
4250a5e5	472	if (pull(commit_id))
6eb7ed54 DB	473	return 1;
6eb7ed54 DB	474
1db69b57	475	curl_slist_free_all(no_pragma_header);
6eb7ed54 DB	476	curl_global_cleanup();
	477	return 0;
	478	}