X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=http-fetch.c;h=71a8c60b56914ca579db3da1d2bef6795acc7bf9;hb=48bc2fb0cd9ca05005c2062c3493e62e13593f55;hp=df99ba7cfd4302059e2b7fad6a4373cc47bce8b4;hpb=215a7ad1ef790467a4cd3f0dcffbd6e5f04c38f7;p=git.git

diff --git a/http-fetch.c b/http-fetch.c
index df99ba7c..71a8c60b 100644
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -1,6 +1,6 @@
 #include "cache.h"
 #include "commit.h"
-
+#include "pack.h"
 #include "fetch.h"
 
 #include <curl/curl.h>
@@ -13,9 +13,25 @@
 #define curl_global_init(a) do { /* nothing */ } while(0)
 #endif
 
+#define PREV_BUF_SIZE 4096
+#define RANGE_HEADER_SIZE 30
+
 static CURL *curl;
+static struct curl_slist *no_pragma_header;
+static struct curl_slist *no_range_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 char *base;
+static struct alt_base *alt = NULL;
 
 static SHA_CTX c;
 static z_stream stream;
@@ -24,6 +40,10 @@ 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
 {
@@ -71,14 +91,37 @@ void prefetch(unsigned char *sha1)
 {
 }
 
-static int got_indices = 0;
+int relink_or_rename(char *old, char *new) {
+	int ret;
+
+	ret = link(old, new);
+	if (ret < 0) {
+		/* Same Coda hack as in write_sha1_file(sha1_file.c) */
+		ret = errno;
+		if (ret == EXDEV && !rename(old, new))
+			return 0;
+	}
+	unlink(old);
+	if (ret) {
+		if (ret != EEXIST)
+			return ret;
+	}
+
+	return 0;
+}
 
-static struct packed_git *packs = NULL;
+static int got_alternates = 0;
 
-static int fetch_index(unsigned char *sha1)
+static int fetch_index(struct alt_base *repo, unsigned char *sha1)
 {
 	char *filename;
 	char *url;
+	char tmpfile[PATH_MAX];
+	int ret;
+	long prev_posn = 0;
+	char range[RANGE_HEADER_SIZE];
+	struct curl_slist *range_header = NULL;
+	CURLcode curl_result;
 
 	FILE *indexfile;
 
@@ -89,12 +132,13 @@ static int fetch_index(unsigned char *sha1)
 		fprintf(stderr, "Getting index for pack %s\n",
 			sha1_to_hex(sha1));
 	
-	url = xmalloc(strlen(base) + 64);
+	url = xmalloc(strlen(repo->base) + 64);
 	sprintf(url, "%s/objects/pack/pack-%s.idx",
-		base, sha1_to_hex(sha1));
+		repo->base, sha1_to_hex(sha1));
 	
 	filename = sha1_pack_index_name(sha1);
-	indexfile = fopen(filename, "w");
+	snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
+	indexfile = fopen(tmpfile, "a");
 	if (!indexfile)
 		return error("Unable to open local file %s for pack index",
 			     filename);
@@ -102,32 +146,159 @@ static int fetch_index(unsigned char *sha1)
 	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)) {
+	/* If there is data present from a previous transfer attempt,
+	   resume where it left off */
+	prev_posn = ftell(indexfile);
+	if (prev_posn>0) {
+		if (get_verbosely)
+			fprintf(stderr,
+				"Resuming fetch of index for pack %s at byte %ld\n",
+				sha1_to_hex(sha1), prev_posn);
+		sprintf(range, "Range: bytes=%ld-", prev_posn);
+		range_header = curl_slist_append(range_header, range);
+		curl_easy_setopt(curl, CURLOPT_HTTPHEADER, range_header);
+	}
+
+	/* Clear out the Range: header after performing the request, so
+	   other curl requests don't inherit inappropriate header data */
+	curl_result = curl_easy_perform(curl);
+	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_range_header);
+	if (curl_result != 0) {
 		fclose(indexfile);
-		return error("Unable to get pack index %s", url);
+		return error("Unable to get pack index %s\n%s", url,
+			     curl_errorstr);
 	}
 
 	fclose(indexfile);
+
+	ret = relink_or_rename(tmpfile, filename);
+	if (ret)
+		return error("unable to write index filename %s: %s",
+			     filename, strerror(ret));
+
 	return 0;
 }
 
-static int setup_index(unsigned char *sha1)
+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(sha1))
+	if (fetch_index(repo, sha1))
 		return -1;
 
 	new_pack = parse_pack_index(sha1);
-	new_pack->next = packs;
-	packs = new_pack;
+	new_pack->next = repo->packs;
+	repo->packs = new_pack;
 	return 0;
 }
 
-static int fetch_indices(void)
+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;
@@ -135,7 +306,7 @@ static int fetch_indices(void)
 	char *data;
 	int i = 0;
 
-	if (got_indices)
+	if (repo->got_indices)
 		return 0;
 
 	data = xmalloc(4096);
@@ -146,18 +317,19 @@ static int fetch_indices(void)
 	if (get_verbosely)
 		fprintf(stderr, "Getting pack list\n");
 	
-	url = xmalloc(strlen(base) + 21);
-	sprintf(url, "%s/objects/info/packs", base);
+	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("Unable to get pack index %s", url);
-	}
+	if (curl_easy_perform(curl))
+		return error("%s", curl_errorstr);
 
-	do {
+	while (i < buffer.posn) {
 		switch (data[i]) {
 		case 'P':
 			i++;
@@ -165,7 +337,7 @@ static int fetch_indices(void)
 			    !strncmp(data + i, " pack-", 6) &&
 			    !strncmp(data + i + 46, ".pack\n", 6)) {
 				get_sha1_hex(data + i + 6, sha1);
-				setup_index(sha1);
+				setup_index(repo, sha1);
 				i += 51;
 				break;
 			}
@@ -174,26 +346,31 @@ static int fetch_indices(void)
 				i++;
 		}
 		i++;
-	} while (i < buffer.posn);
+	}
 
-	got_indices = 1;
+	repo->got_indices = 1;
 	return 0;
 }
 
-static int fetch_pack(unsigned char *sha1)
+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())
+	char tmpfile[PATH_MAX];
+	int ret;
+	long prev_posn = 0;
+	char range[RANGE_HEADER_SIZE];
+	struct curl_slist *range_header = NULL;
+	CURLcode curl_result;
+
+	if (fetch_indices(repo))
 		return -1;
-	target = find_sha1_pack(sha1, packs);
+	target = find_sha1_pack(sha1, repo->packs);
 	if (!target)
-		return error("Couldn't get %s: not separate or in any pack",
-			     sha1_to_hex(sha1));
+		return -1;
 
 	if (get_verbosely) {
 		fprintf(stderr, "Getting pack %s\n",
@@ -202,12 +379,13 @@ static int fetch_pack(unsigned char *sha1)
 			sha1_to_hex(sha1));
 	}
 
-	url = xmalloc(strlen(base) + 65);
+	url = xmalloc(strlen(repo->base) + 65);
 	sprintf(url, "%s/objects/pack/pack-%s.pack",
-		base, sha1_to_hex(target->sha1));
+		repo->base, sha1_to_hex(target->sha1));
 
 	filename = sha1_pack_name(target->sha1);
-	packfile = fopen(filename, "w");
+	snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
+	packfile = fopen(tmpfile, "a");
 	if (!packfile)
 		return error("Unable to open local file %s for pack",
 			     filename);
@@ -215,36 +393,87 @@ static int fetch_pack(unsigned char *sha1)
 	curl_easy_setopt(curl, CURLOPT_FILE, packfile);
 	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
 	curl_easy_setopt(curl, CURLOPT_URL, url);
-	
-	if (curl_easy_perform(curl)) {
+	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
+	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
+
+	/* If there is data present from a previous transfer attempt,
+	   resume where it left off */
+	prev_posn = ftell(packfile);
+	if (prev_posn>0) {
+		if (get_verbosely)
+			fprintf(stderr,
+				"Resuming fetch of pack %s at byte %ld\n",
+				sha1_to_hex(target->sha1), prev_posn);
+		sprintf(range, "Range: bytes=%ld-", prev_posn);
+		range_header = curl_slist_append(range_header, range);
+		curl_easy_setopt(curl, CURLOPT_HTTPHEADER, range_header);
+	}
+
+	/* Clear out the Range: header after performing the request, so
+	   other curl requests don't inherit inappropriate header data */
+	curl_result = curl_easy_perform(curl);
+	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_range_header);
+	if (curl_result != 0) {
 		fclose(packfile);
-		return error("Unable to get pack file %s", url);
+		return error("Unable to get pack file %s\n%s", url,
+			     curl_errorstr);
 	}
 
 	fclose(packfile);
 
-	lst = &packs;
+	ret = relink_or_rename(tmpfile, filename);
+	if (ret)
+		return error("unable to write pack filename %s: %s",
+			     filename, strerror(ret));
+
+	lst = &repo->packs;
 	while (*lst != target)
 		lst = &((*lst)->next);
 	*lst = (*lst)->next;
 
+	if (verify_pack(target, 0))
+		return -1;
 	install_packed_git(target);
 
 	return 0;
 }
 
-int fetch(unsigned char *sha1)
+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];
+	char prevfile[PATH_MAX];
+	int ret;
 	char *url;
 	char *posn;
+	int prevlocal;
+	unsigned char prev_buf[PREV_BUF_SIZE];
+	ssize_t prev_read = 0;
+	long prev_posn = 0;
+	char range[RANGE_HEADER_SIZE];
+	struct curl_slist *range_header = NULL;
+	CURLcode curl_result;
+
+	snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
+	snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
 
-	local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
+	if (unlink(prevfile) && (errno != ENOENT))
+		return error("Failed to unlink %s (%s)",
+			     prevfile, strerror(errno));
+	if (rename(tmpfile, prevfile) && (errno != ENOENT))
+		return error("Failed to rename %s to %s (%s)",
+			     tmpfile, prevfile, strerror(errno));
+
+	local = open(tmpfile, O_WRONLY | O_CREAT | O_EXCL, 0666);
+
+	/* Note: if another instance starts now, it will turn our new
+	   tmpfile into its prevfile. */
 
 	if (local < 0)
-		return error("Couldn't open local object %s\n", filename);
+		return error("Couldn't create temporary file %s for %s: %s\n",
+			     tmpfile, filename, strerror(errno));
 
 	memset(&stream, 0, sizeof(stream));
 
@@ -255,10 +484,12 @@ int fetch(unsigned char *sha1)
 	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(base) + 50);
-	strcpy(url, base);
-	posn = url + strlen(base);
+	url = xmalloc(strlen(repo->base) + 50);
+	strcpy(url, repo->base);
+	posn = url + strlen(repo->base);
 	strcpy(posn, "objects/");
 	posn += 8;
 	memcpy(posn, hex, 2);
@@ -268,34 +499,105 @@ int fetch(unsigned char *sha1)
 
 	curl_easy_setopt(curl, CURLOPT_URL, url);
 
-	if (curl_easy_perform(curl)) {
-		unlink(filename);
-		if (fetch_pack(sha1))
-			return error("Tried %s", url);
-		return 0;
+	/* If a previous temp file is present, process what was already
+	   fetched. */
+	prevlocal = open(prevfile, O_RDONLY);
+	if (prevlocal != -1) {
+		do {
+			prev_read = read(prevlocal, prev_buf, PREV_BUF_SIZE);
+			if (prev_read>0) {
+				if (fwrite_sha1_file(prev_buf,
+						     1,
+						     prev_read,
+						     NULL) == prev_read) {
+					prev_posn += prev_read;
+				} else {
+					prev_read = -1;
+				}
+			}
+		} while (prev_read > 0);
+		close(prevlocal);
+	}
+	unlink(prevfile);
+
+	/* Reset inflate/SHA1 if there was an error reading the previous temp
+	   file; also rewind to the beginning of the local file. */
+	if (prev_read == -1) {
+		memset(&stream, 0, sizeof(stream));
+		inflateInit(&stream);
+		SHA1_Init(&c);
+		if (prev_posn>0) {
+			prev_posn = 0;
+			lseek(local, SEEK_SET, 0);
+			ftruncate(local, 0);
+		}
+	}
+
+	/* If we have successfully processed data from a previous fetch
+	   attempt, only fetch the data we don't already have. */
+	if (prev_posn>0) {
+		if (get_verbosely)
+			fprintf(stderr,
+				"Resuming fetch of object %s at byte %ld\n",
+				hex, prev_posn);
+		sprintf(range, "Range: bytes=%ld-", prev_posn);
+		range_header = curl_slist_append(range_header, range);
+		curl_easy_setopt(curl, CURLOPT_HTTPHEADER, range_header);
+	}
+
+	/* Clear out the Range: header after performing the request, so
+	   other curl requests don't inherit inappropriate header data */
+	curl_result = curl_easy_perform(curl);
+	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_range_header);
+	if (curl_result != 0) {
+		return error("%s", curl_errorstr);
 	}
 
+	fchmod(local, 0444);
 	close(local);
 	inflateEnd(&stream);
 	SHA1_Final(real_sha1, &c);
 	if (zret != Z_STREAM_END) {
-		unlink(filename);
+		unlink(tmpfile);
 		return error("File %s (%s) corrupt\n", hex, url);
 	}
 	if (memcmp(sha1, real_sha1, 20)) {
-		unlink(filename);
+		unlink(tmpfile);
 		return error("File %s has bad hash\n", hex);
 	}
-	
+	ret = relink_or_rename(tmpfile, filename);
+	if (ret)
+		return error("unable to write sha1 filename %s: %s",
+			     filename, strerror(ret));
+
 	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;
@@ -303,6 +605,8 @@ int fetch_ref(char *ref, unsigned char *sha1)
         
         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);
@@ -314,7 +618,8 @@ int fetch_ref(char *ref, unsigned char *sha1)
         curl_easy_setopt(curl, CURLOPT_URL, url);
 
         if (curl_easy_perform(curl))
-                return error("Couldn't get %s for %s\n", url, ref);
+                return error("Couldn't get %s for %s\n%s",
+			     url, ref, curl_errorstr);
 
         hex[40] = '\0';
         get_sha1_hex(hex, sha1);
@@ -341,6 +646,8 @@ int main(int argc, char **argv)
 		} else if (argv[arg][1] == 'w') {
 			write_ref = argv[arg + 1];
 			arg++;
+		} else if (!strcmp(argv[arg], "--recover")) {
+			get_recover = 1;
 		}
 		arg++;
 	}
@@ -354,18 +661,43 @@ int main(int argc, char **argv)
 	curl_global_init(CURL_GLOBAL_ALL);
 
 	curl = curl_easy_init();
+	no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
+	no_range_header = curl_slist_append(no_range_header, "Range:");
 
-	curl_ssl_verify = gitenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
+	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
 
-	base = url;
+	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;
 }