/*
* Copyright (c) 2018, 2019 Ori Bernstein <ori@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/uio.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <endian.h>
#include <errno.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <sha1.h>
#include <unistd.h>
#include <zlib.h>
#include <ctype.h>
#include <limits.h>
#include <imsg.h>
#include <time.h>
#include <uuid.h>
#include "got_error.h"
#include "got_reference.h"
#include "got_repository.h"
#include "got_path.h"
#include "got_cancel.h"
#include "got_worktree.h"
#include "got_object.h"
#include "got_opentemp.h"
#include "got_fetch.h"
#include "got_lib_delta.h"
#include "got_lib_inflate.h"
#include "got_lib_object.h"
#include "got_lib_object_parse.h"
#include "got_lib_object_create.h"
#include "got_lib_pack.h"
#include "got_lib_sha1.h"
#include "got_lib_privsep.h"
#include "got_lib_object_cache.h"
#include "got_lib_repository.h"
#include "got_lib_dial.h"
#include "got_lib_pkt.h"
#ifndef nitems
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
#endif
#ifndef ssizeof
#define ssizeof(_x) ((ssize_t)(sizeof(_x)))
#endif
#ifndef MIN
#define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
#endif
const struct got_error *
got_fetch_connect(pid_t *fetchpid, int *fetchfd, const char *proto,
const char *host, const char *port, const char *server_path, int verbosity)
{
const struct got_error *err = NULL;
*fetchpid = -1;
*fetchfd = -1;
if (strcmp(proto, "ssh") == 0 || strcmp(proto, "git+ssh") == 0)
err = got_dial_ssh(fetchpid, fetchfd, host, port,
server_path, GOT_DIAL_DIRECTION_FETCH, verbosity);
else if (strcmp(proto, "git") == 0)
err = got_dial_git(fetchfd, host, port, server_path,
GOT_DIAL_DIRECTION_FETCH);
else if (strcmp(proto, "http") == 0 || strcmp(proto, "git+http") == 0)
err = got_error_path(proto, GOT_ERR_NOT_IMPL);
else
err = got_error_path(proto, GOT_ERR_BAD_PROTO);
return err;
}
const struct got_error *
got_fetch_pack(struct got_object_id **pack_hash, struct got_pathlist_head *refs,
struct got_pathlist_head *symrefs, const char *remote_name,
int mirror_references, int fetch_all_branches,
struct got_pathlist_head *wanted_branches,
struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity,
int fetchfd, struct got_repository *repo,
got_fetch_progress_cb progress_cb, void *progress_arg)
{
size_t i;
int imsg_fetchfds[2], imsg_idxfds[2];
int packfd = -1, npackfd = -1, idxfd = -1, nidxfd = -1, nfetchfd = -1;
int tmpfds[3];
int fetchstatus, idxstatus, done = 0;
const struct got_error *err;
struct imsgbuf fetchibuf, idxibuf;
pid_t fetchpid, idxpid;
char *tmppackpath = NULL, *tmpidxpath = NULL;
char *packpath = NULL, *idxpath = NULL, *id_str = NULL;
const char *repo_path = NULL;
struct got_pathlist_head have_refs;
struct got_pathlist_entry *pe;
struct got_reflist_head my_refs;
struct got_reflist_entry *re;
off_t packfile_size = 0;
struct got_packfile_hdr pack_hdr;
uint32_t nobj = 0;
char *path;
char *progress = NULL;
*pack_hash = NULL;
/*
* Prevent fetching of references that won't make any
* sense outside of the remote repository's context.
*/
TAILQ_FOREACH(pe, wanted_refs, entry) {
const char *refname = pe->path;
if (strncmp(refname, "refs/got/", 9) == 0 ||
strncmp(refname, "got/", 4) == 0 ||
strncmp(refname, "refs/remotes/", 13) == 0 ||
strncmp(refname, "remotes/", 8) == 0)
return got_error_path(refname, GOT_ERR_FETCH_BAD_REF);
}
if (!list_refs_only)
repo_path = got_repo_get_path_git_dir(repo);
for (i = 0; i < nitems(tmpfds); i++)
tmpfds[i] = -1;
TAILQ_INIT(&have_refs);
TAILQ_INIT(&my_refs);
if (!list_refs_only) {
err = got_ref_list(&my_refs, repo, NULL,
got_ref_cmp_by_name, NULL);
if (err)
goto done;
}
TAILQ_FOREACH(re, &my_refs, entry) {
struct got_object_id *id;
const char *refname;
if (got_ref_is_symbolic(re->ref))
continue;
err = got_ref_resolve(&id, repo, re->ref);
if (err)
goto done;
refname = strdup(got_ref_get_name(re->ref));
if (refname == NULL) {
err = got_error_from_errno("strdup");
goto done;
}
err = got_pathlist_append(&have_refs, refname, id);
if (err)
goto done;
}
if (list_refs_only) {
packfd = got_opentempfd();
if (packfd == -1) {
err = got_error_from_errno("got_opentempfd");
goto done;
}
} else {
if (asprintf(&path, "%s/%s/fetching.pack",
repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
err = got_opentemp_named_fd(&tmppackpath, &packfd, path);
free(path);
if (err)
goto done;
if (fchmod(packfd, GOT_DEFAULT_FILE_MODE) != 0) {
err = got_error_from_errno2("fchmod", tmppackpath);
goto done;
}
}
if (list_refs_only) {
idxfd = got_opentempfd();
if (idxfd == -1) {
err = got_error_from_errno("got_opentempfd");
goto done;
}
} else {
if (asprintf(&path, "%s/%s/fetching.idx",
repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
err = got_opentemp_named_fd(&tmpidxpath, &idxfd, path);
free(path);
if (err)
goto done;
if (fchmod(idxfd, GOT_DEFAULT_FILE_MODE) != 0) {
err = got_error_from_errno2("fchmod", tmpidxpath);
goto done;
}
}
nidxfd = dup(idxfd);
if (nidxfd == -1) {
err = got_error_from_errno("dup");
goto done;
}
for (i = 0; i < nitems(tmpfds); i++) {
tmpfds[i] = got_opentempfd();
if (tmpfds[i] == -1) {
err = got_error_from_errno("got_opentempfd");
goto done;
}
}
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fetchfds) == -1) {
err = got_error_from_errno("socketpair");
goto done;
}
fetchpid = fork();
if (fetchpid == -1) {
err = got_error_from_errno("fork");
goto done;
} else if (fetchpid == 0){
got_privsep_exec_child(imsg_fetchfds,
GOT_PATH_PROG_FETCH_PACK, tmppackpath);
}
if (close(imsg_fetchfds[1]) == -1) {
err = got_error_from_errno("close");
goto done;
}
imsg_init(&fetchibuf, imsg_fetchfds[0]);
nfetchfd = dup(fetchfd);
if (nfetchfd == -1) {
err = got_error_from_errno("dup");
goto done;
}
err = got_privsep_send_fetch_req(&fetchibuf, nfetchfd, &have_refs,
fetch_all_branches, wanted_branches, wanted_refs,
list_refs_only, verbosity);
if (err != NULL)
goto done;
nfetchfd = -1;
npackfd = dup(packfd);
if (npackfd == -1) {
err = got_error_from_errno("dup");
goto done;
}
err = got_privsep_send_fetch_outfd(&fetchibuf, npackfd);
if (err != NULL)
goto done;
npackfd = -1;
packfile_size = 0;
progress = calloc(GOT_PKT_MAX, 1);
if (progress == NULL) {
err = got_error_from_errno("calloc");
goto done;
}
*pack_hash = calloc(1, sizeof(**pack_hash));
if (*pack_hash == NULL) {
err = got_error_from_errno("calloc");
goto done;
}
while (!done) {
struct got_object_id *id = NULL;
char *refname = NULL;
char *server_progress = NULL;
off_t packfile_size_cur = 0;
err = got_privsep_recv_fetch_progress(&done,
&id, &refname, symrefs, &server_progress,
&packfile_size_cur, (*pack_hash)->sha1, &fetchibuf);
if (err != NULL)
goto done;
/* Don't report size progress for an empty pack file. */
if (packfile_size_cur <= ssizeof(pack_hdr) + SHA1_DIGEST_LENGTH)
packfile_size_cur = 0;
if (!done && refname && id) {
err = got_pathlist_insert(NULL, refs, refname, id);
if (err)
goto done;
} else if (!done && server_progress) {
char *p;
/*
* XXX git-daemon tends to send batched output with
* lines spanning separate packets. Buffer progress
* output until we see a CR or LF to avoid giving
* partial lines of progress output to the callback.
*/
if (strlcat(progress, server_progress,
GOT_PKT_MAX) >= GOT_PKT_MAX) {
progress[0] = '\0'; /* discard */
continue;
}
while ((p = strchr(progress, '\r')) != NULL ||
(p = strchr(progress, '\n')) != NULL) {
char *s;
size_t n;
char c = *p;
*p = '\0';
if (asprintf(&s, "%s%s", progress,
c == '\n' ? "\n" : "") == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
err = progress_cb(progress_arg, s,
packfile_size_cur, 0, 0, 0, 0);
free(s);
if (err)
break;
n = strlen(progress);
if (n < GOT_PKT_MAX - 1) {
memmove(progress, &progress[n + 1],
GOT_PKT_MAX - n - 1);
} else
progress[0] = '\0';
}
free(server_progress);
if (err)
goto done;
} else if (!done && packfile_size_cur != packfile_size) {
err = progress_cb(progress_arg, NULL,
packfile_size_cur, 0, 0, 0, 0);
if (err)
break;
packfile_size = packfile_size_cur;
}
}
if (waitpid(fetchpid, &fetchstatus, 0) == -1) {
err = got_error_from_errno("waitpid");
goto done;
}
if (lseek(packfd, 0, SEEK_SET) == -1) {
err = got_error_from_errno("lseek");
goto done;
}
/* If zero data was fetched without error we are already up-to-date. */
if (packfile_size == 0) {
free(*pack_hash);
*pack_hash = NULL;
goto done;
} else if (packfile_size < ssizeof(pack_hdr) + SHA1_DIGEST_LENGTH) {
err = got_error_msg(GOT_ERR_BAD_PACKFILE, "short pack file");
goto done;
} else {
ssize_t n;
n = read(packfd, &pack_hdr, ssizeof(pack_hdr));
if (n == -1) {
err = got_error_from_errno("read");
goto done;
}
if (n != ssizeof(pack_hdr)) {
err = got_error(GOT_ERR_IO);
goto done;
}
if (pack_hdr.signature != htobe32(GOT_PACKFILE_SIGNATURE)) {
err = got_error_msg(GOT_ERR_BAD_PACKFILE,
"bad pack file signature");
goto done;
}
if (pack_hdr.version != htobe32(GOT_PACKFILE_VERSION)) {
err = got_error_msg(GOT_ERR_BAD_PACKFILE,
"bad pack file version");
goto done;
}
nobj = be32toh(pack_hdr.nobjects);
if (nobj == 0 &&
packfile_size > ssizeof(pack_hdr) + SHA1_DIGEST_LENGTH)
return got_error_msg(GOT_ERR_BAD_PACKFILE,
"bad pack file with zero objects");
if (nobj != 0 &&
packfile_size <= ssizeof(pack_hdr) + SHA1_DIGEST_LENGTH)
return got_error_msg(GOT_ERR_BAD_PACKFILE,
"empty pack file with non-zero object count");
}
/*
* If the pack file contains no objects, we may only need to update
* references in our repository. The caller will take care of that.
*/
if (nobj == 0) {
free(*pack_hash);
*pack_hash = NULL;
goto done;
}
if (lseek(packfd, 0, SEEK_SET) == -1) {
err = got_error_from_errno("lseek");
goto done;
}
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_idxfds) == -1) {
err = got_error_from_errno("socketpair");
goto done;
}
idxpid = fork();
if (idxpid == -1) {
err= got_error_from_errno("fork");
goto done;
} else if (idxpid == 0)
got_privsep_exec_child(imsg_idxfds,
GOT_PATH_PROG_INDEX_PACK, tmppackpath);
if (close(imsg_idxfds[1]) == -1) {
err = got_error_from_errno("close");
goto done;
}
imsg_init(&idxibuf, imsg_idxfds[0]);
npackfd = dup(packfd);
if (npackfd == -1) {
err = got_error_from_errno("dup");
goto done;
}
err = got_privsep_send_index_pack_req(&idxibuf, (*pack_hash)->sha1,
npackfd);
if (err != NULL)
goto done;
npackfd = -1;
err = got_privsep_send_index_pack_outfd(&idxibuf, nidxfd);
if (err != NULL)
goto done;
nidxfd = -1;
for (i = 0; i < nitems(tmpfds); i++) {
err = got_privsep_send_tmpfd(&idxibuf, tmpfds[i]);
if (err != NULL)
goto done;
tmpfds[i] = -1;
}
done = 0;
while (!done) {
int nobj_total, nobj_indexed, nobj_loose, nobj_resolved;
err = got_privsep_recv_index_progress(&done, &nobj_total,
&nobj_indexed, &nobj_loose, &nobj_resolved,
&idxibuf);
if (err != NULL)
goto done;
if (nobj_indexed != 0) {
err = progress_cb(progress_arg, NULL,
packfile_size, nobj_total,
nobj_indexed, nobj_loose, nobj_resolved);
if (err)
break;
}
imsg_clear(&idxibuf);
}
if (close(imsg_idxfds[0]) == -1) {
err = got_error_from_errno("close");
goto done;
}
if (waitpid(idxpid, &idxstatus, 0) == -1) {
err = got_error_from_errno("waitpid");
goto done;
}
err = got_object_id_str(&id_str, *pack_hash);
if (err)
goto done;
if (asprintf(&packpath, "%s/%s/pack-%s.pack",
repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
if (asprintf(&idxpath, "%s/%s/pack-%s.idx",
repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
if (rename(tmppackpath, packpath) == -1) {
err = got_error_from_errno3("rename", tmppackpath, packpath);
goto done;
}
free(tmppackpath);
tmppackpath = NULL;
if (rename(tmpidxpath, idxpath) == -1) {
err = got_error_from_errno3("rename", tmpidxpath, idxpath);
goto done;
}
free(tmpidxpath);
tmpidxpath = NULL;
done:
if (tmppackpath && unlink(tmppackpath) == -1 && err == NULL)
err = got_error_from_errno2("unlink", tmppackpath);
if (tmpidxpath && unlink(tmpidxpath) == -1 && err == NULL)
err = got_error_from_errno2("unlink", tmpidxpath);
if (nfetchfd != -1 && close(nfetchfd) == -1 && err == NULL)
err = got_error_from_errno("close");
if (npackfd != -1 && close(npackfd) == -1 && err == NULL)
err = got_error_from_errno("close");
if (packfd != -1 && close(packfd) == -1 && err == NULL)
err = got_error_from_errno("close");
if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
err = got_error_from_errno("close");
for (i = 0; i < nitems(tmpfds); i++) {
if (tmpfds[i] != -1 && close(tmpfds[i]) == -1 && err == NULL)
err = got_error_from_errno("close");
}
free(tmppackpath);
free(tmpidxpath);
free(idxpath);
free(packpath);
free(progress);
TAILQ_FOREACH(pe, &have_refs, entry) {
free((char *)pe->path);
free(pe->data);
}
got_pathlist_free(&have_refs);
got_ref_list_free(&my_refs);
if (err) {
free(*pack_hash);
*pack_hash = NULL;
TAILQ_FOREACH(pe, refs, entry) {
free((void *)pe->path);
free(pe->data);
}
got_pathlist_free(refs);
TAILQ_FOREACH(pe, symrefs, entry) {
free((void *)pe->path);
free(pe->data);
}
got_pathlist_free(symrefs);
}
return err;
}
