fetch-pack: move core code to libgit.a
fetch_pack() is used by transport.c, part of libgit.a while it stays
in builtin/fetch-pack.c. Move it to fetch-pack.c so that we won't get
undefined reference if a program that uses libgit.a happens to pull it
in.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
diff --git a/fetch-pack.c b/fetch-pack.c
new file mode 100644
index 0000000..099ff4d
--- /dev/null
+++ b/fetch-pack.c
@@ -0,0 +1,951 @@
+#include "cache.h"
+#include "refs.h"
+#include "pkt-line.h"
+#include "commit.h"
+#include "tag.h"
+#include "exec_cmd.h"
+#include "pack.h"
+#include "sideband.h"
+#include "fetch-pack.h"
+#include "remote.h"
+#include "run-command.h"
+#include "transport.h"
+#include "version.h"
+
+static int transfer_unpack_limit = -1;
+static int fetch_unpack_limit = -1;
+static int unpack_limit = 100;
+static int prefer_ofs_delta = 1;
+static int no_done;
+static int fetch_fsck_objects = -1;
+static int transfer_fsck_objects = -1;
+static int agent_supported;
+
+#define COMPLETE (1U << 0)
+#define COMMON (1U << 1)
+#define COMMON_REF (1U << 2)
+#define SEEN (1U << 3)
+#define POPPED (1U << 4)
+
+static int marked;
+
+/*
+ * After sending this many "have"s if we do not get any new ACK , we
+ * give up traversing our history.
+ */
+#define MAX_IN_VAIN 256
+
+static struct commit_list *rev_list;
+static int non_common_revs, multi_ack, use_sideband;
+
+static void rev_list_push(struct commit *commit, int mark)
+{
+ if (!(commit->object.flags & mark)) {
+ commit->object.flags |= mark;
+
+ if (!(commit->object.parsed))
+ if (parse_commit(commit))
+ return;
+
+ commit_list_insert_by_date(commit, &rev_list);
+
+ if (!(commit->object.flags & COMMON))
+ non_common_revs++;
+ }
+}
+
+static int rev_list_insert_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
+{
+ struct object *o = deref_tag(parse_object(sha1), refname, 0);
+
+ if (o && o->type == OBJ_COMMIT)
+ rev_list_push((struct commit *)o, SEEN);
+
+ return 0;
+}
+
+static int clear_marks(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
+{
+ struct object *o = deref_tag(parse_object(sha1), refname, 0);
+
+ if (o && o->type == OBJ_COMMIT)
+ clear_commit_marks((struct commit *)o,
+ COMMON | COMMON_REF | SEEN | POPPED);
+ return 0;
+}
+
+/*
+ This function marks a rev and its ancestors as common.
+ In some cases, it is desirable to mark only the ancestors (for example
+ when only the server does not yet know that they are common).
+*/
+
+static void mark_common(struct commit *commit,
+ int ancestors_only, int dont_parse)
+{
+ if (commit != NULL && !(commit->object.flags & COMMON)) {
+ struct object *o = (struct object *)commit;
+
+ if (!ancestors_only)
+ o->flags |= COMMON;
+
+ if (!(o->flags & SEEN))
+ rev_list_push(commit, SEEN);
+ else {
+ struct commit_list *parents;
+
+ if (!ancestors_only && !(o->flags & POPPED))
+ non_common_revs--;
+ if (!o->parsed && !dont_parse)
+ if (parse_commit(commit))
+ return;
+
+ for (parents = commit->parents;
+ parents;
+ parents = parents->next)
+ mark_common(parents->item, 0, dont_parse);
+ }
+ }
+}
+
+/*
+ Get the next rev to send, ignoring the common.
+*/
+
+static const unsigned char *get_rev(void)
+{
+ struct commit *commit = NULL;
+
+ while (commit == NULL) {
+ unsigned int mark;
+ struct commit_list *parents;
+
+ if (rev_list == NULL || non_common_revs == 0)
+ return NULL;
+
+ commit = rev_list->item;
+ if (!commit->object.parsed)
+ parse_commit(commit);
+ parents = commit->parents;
+
+ commit->object.flags |= POPPED;
+ if (!(commit->object.flags & COMMON))
+ non_common_revs--;
+
+ if (commit->object.flags & COMMON) {
+ /* do not send "have", and ignore ancestors */
+ commit = NULL;
+ mark = COMMON | SEEN;
+ } else if (commit->object.flags & COMMON_REF)
+ /* send "have", and ignore ancestors */
+ mark = COMMON | SEEN;
+ else
+ /* send "have", also for its ancestors */
+ mark = SEEN;
+
+ while (parents) {
+ if (!(parents->item->object.flags & SEEN))
+ rev_list_push(parents->item, mark);
+ if (mark & COMMON)
+ mark_common(parents->item, 1, 0);
+ parents = parents->next;
+ }
+
+ rev_list = rev_list->next;
+ }
+
+ return commit->object.sha1;
+}
+
+enum ack_type {
+ NAK = 0,
+ ACK,
+ ACK_continue,
+ ACK_common,
+ ACK_ready
+};
+
+static void consume_shallow_list(struct fetch_pack_args *args, int fd)
+{
+ if (args->stateless_rpc && args->depth > 0) {
+ /* If we sent a depth we will get back "duplicate"
+ * shallow and unshallow commands every time there
+ * is a block of have lines exchanged.
+ */
+ char line[1000];
+ while (packet_read_line(fd, line, sizeof(line))) {
+ if (!prefixcmp(line, "shallow "))
+ continue;
+ if (!prefixcmp(line, "unshallow "))
+ continue;
+ die("git fetch-pack: expected shallow list");
+ }
+ }
+}
+
+struct write_shallow_data {
+ struct strbuf *out;
+ int use_pack_protocol;
+ int count;
+};
+
+static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
+{
+ struct write_shallow_data *data = cb_data;
+ const char *hex = sha1_to_hex(graft->sha1);
+ data->count++;
+ if (data->use_pack_protocol)
+ packet_buf_write(data->out, "shallow %s", hex);
+ else {
+ strbuf_addstr(data->out, hex);
+ strbuf_addch(data->out, '\n');
+ }
+ return 0;
+}
+
+static int write_shallow_commits(struct strbuf *out, int use_pack_protocol)
+{
+ struct write_shallow_data data;
+ data.out = out;
+ data.use_pack_protocol = use_pack_protocol;
+ data.count = 0;
+ for_each_commit_graft(write_one_shallow, &data);
+ return data.count;
+}
+
+static enum ack_type get_ack(int fd, unsigned char *result_sha1)
+{
+ static char line[1000];
+ int len = packet_read_line(fd, line, sizeof(line));
+
+ if (!len)
+ die("git fetch-pack: expected ACK/NAK, got EOF");
+ if (line[len-1] == '\n')
+ line[--len] = 0;
+ if (!strcmp(line, "NAK"))
+ return NAK;
+ if (!prefixcmp(line, "ACK ")) {
+ if (!get_sha1_hex(line+4, result_sha1)) {
+ if (strstr(line+45, "continue"))
+ return ACK_continue;
+ if (strstr(line+45, "common"))
+ return ACK_common;
+ if (strstr(line+45, "ready"))
+ return ACK_ready;
+ return ACK;
+ }
+ }
+ die("git fetch_pack: expected ACK/NAK, got '%s'", line);
+}
+
+static void send_request(struct fetch_pack_args *args,
+ int fd, struct strbuf *buf)
+{
+ if (args->stateless_rpc) {
+ send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
+ packet_flush(fd);
+ } else
+ safe_write(fd, buf->buf, buf->len);
+}
+
+static void insert_one_alternate_ref(const struct ref *ref, void *unused)
+{
+ rev_list_insert_ref(NULL, ref->old_sha1, 0, NULL);
+}
+
+#define INITIAL_FLUSH 16
+#define PIPESAFE_FLUSH 32
+#define LARGE_FLUSH 1024
+
+static int next_flush(struct fetch_pack_args *args, int count)
+{
+ int flush_limit = args->stateless_rpc ? LARGE_FLUSH : PIPESAFE_FLUSH;
+
+ if (count < flush_limit)
+ count <<= 1;
+ else
+ count += flush_limit;
+ return count;
+}
+
+static int find_common(struct fetch_pack_args *args,
+ int fd[2], unsigned char *result_sha1,
+ struct ref *refs)
+{
+ int fetching;
+ int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
+ const unsigned char *sha1;
+ unsigned in_vain = 0;
+ int got_continue = 0;
+ int got_ready = 0;
+ struct strbuf req_buf = STRBUF_INIT;
+ size_t state_len = 0;
+
+ if (args->stateless_rpc && multi_ack == 1)
+ die("--stateless-rpc requires multi_ack_detailed");
+ if (marked)
+ for_each_ref(clear_marks, NULL);
+ marked = 1;
+
+ for_each_ref(rev_list_insert_ref, NULL);
+ for_each_alternate_ref(insert_one_alternate_ref, NULL);
+
+ fetching = 0;
+ for ( ; refs ; refs = refs->next) {
+ unsigned char *remote = refs->old_sha1;
+ const char *remote_hex;
+ struct object *o;
+
+ /*
+ * If that object is complete (i.e. it is an ancestor of a
+ * local ref), we tell them we have it but do not have to
+ * tell them about its ancestors, which they already know
+ * about.
+ *
+ * We use lookup_object here because we are only
+ * interested in the case we *know* the object is
+ * reachable and we have already scanned it.
+ */
+ if (((o = lookup_object(remote)) != NULL) &&
+ (o->flags & COMPLETE)) {
+ continue;
+ }
+
+ remote_hex = sha1_to_hex(remote);
+ if (!fetching) {
+ struct strbuf c = STRBUF_INIT;
+ if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
+ if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
+ if (no_done) strbuf_addstr(&c, " no-done");
+ if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
+ if (use_sideband == 1) strbuf_addstr(&c, " side-band");
+ if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
+ if (args->no_progress) strbuf_addstr(&c, " no-progress");
+ if (args->include_tag) strbuf_addstr(&c, " include-tag");
+ if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
+ if (agent_supported) strbuf_addf(&c, " agent=%s",
+ git_user_agent_sanitized());
+ packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
+ strbuf_release(&c);
+ } else
+ packet_buf_write(&req_buf, "want %s\n", remote_hex);
+ fetching++;
+ }
+
+ if (!fetching) {
+ strbuf_release(&req_buf);
+ packet_flush(fd[1]);
+ return 1;
+ }
+
+ if (is_repository_shallow())
+ write_shallow_commits(&req_buf, 1);
+ if (args->depth > 0)
+ packet_buf_write(&req_buf, "deepen %d", args->depth);
+ packet_buf_flush(&req_buf);
+ state_len = req_buf.len;
+
+ if (args->depth > 0) {
+ char line[1024];
+ unsigned char sha1[20];
+
+ send_request(args, fd[1], &req_buf);
+ while (packet_read_line(fd[0], line, sizeof(line))) {
+ if (!prefixcmp(line, "shallow ")) {
+ if (get_sha1_hex(line + 8, sha1))
+ die("invalid shallow line: %s", line);
+ register_shallow(sha1);
+ continue;
+ }
+ if (!prefixcmp(line, "unshallow ")) {
+ if (get_sha1_hex(line + 10, sha1))
+ die("invalid unshallow line: %s", line);
+ if (!lookup_object(sha1))
+ die("object not found: %s", line);
+ /* make sure that it is parsed as shallow */
+ if (!parse_object(sha1))
+ die("error in object: %s", line);
+ if (unregister_shallow(sha1))
+ die("no shallow found: %s", line);
+ continue;
+ }
+ die("expected shallow/unshallow, got %s", line);
+ }
+ } else if (!args->stateless_rpc)
+ send_request(args, fd[1], &req_buf);
+
+ if (!args->stateless_rpc) {
+ /* If we aren't using the stateless-rpc interface
+ * we don't need to retain the headers.
+ */
+ strbuf_setlen(&req_buf, 0);
+ state_len = 0;
+ }
+
+ flushes = 0;
+ retval = -1;
+ while ((sha1 = get_rev())) {
+ packet_buf_write(&req_buf, "have %s\n", sha1_to_hex(sha1));
+ if (args->verbose)
+ fprintf(stderr, "have %s\n", sha1_to_hex(sha1));
+ in_vain++;
+ if (flush_at <= ++count) {
+ int ack;
+
+ packet_buf_flush(&req_buf);
+ send_request(args, fd[1], &req_buf);
+ strbuf_setlen(&req_buf, state_len);
+ flushes++;
+ flush_at = next_flush(args, count);
+
+ /*
+ * We keep one window "ahead" of the other side, and
+ * will wait for an ACK only on the next one
+ */
+ if (!args->stateless_rpc && count == INITIAL_FLUSH)
+ continue;
+
+ consume_shallow_list(args, fd[0]);
+ do {
+ ack = get_ack(fd[0], result_sha1);
+ if (args->verbose && ack)
+ fprintf(stderr, "got ack %d %s\n", ack,
+ sha1_to_hex(result_sha1));
+ switch (ack) {
+ case ACK:
+ flushes = 0;
+ multi_ack = 0;
+ retval = 0;
+ goto done;
+ case ACK_common:
+ case ACK_ready:
+ case ACK_continue: {
+ struct commit *commit =
+ lookup_commit(result_sha1);
+ if (!commit)
+ die("invalid commit %s", sha1_to_hex(result_sha1));
+ if (args->stateless_rpc
+ && ack == ACK_common
+ && !(commit->object.flags & COMMON)) {
+ /* We need to replay the have for this object
+ * on the next RPC request so the peer knows
+ * it is in common with us.
+ */
+ const char *hex = sha1_to_hex(result_sha1);
+ packet_buf_write(&req_buf, "have %s\n", hex);
+ state_len = req_buf.len;
+ }
+ mark_common(commit, 0, 1);
+ retval = 0;
+ in_vain = 0;
+ got_continue = 1;
+ if (ack == ACK_ready) {
+ rev_list = NULL;
+ got_ready = 1;
+ }
+ break;
+ }
+ }
+ } while (ack);
+ flushes--;
+ if (got_continue && MAX_IN_VAIN < in_vain) {
+ if (args->verbose)
+ fprintf(stderr, "giving up\n");
+ break; /* give up */
+ }
+ }
+ }
+done:
+ if (!got_ready || !no_done) {
+ packet_buf_write(&req_buf, "done\n");
+ send_request(args, fd[1], &req_buf);
+ }
+ if (args->verbose)
+ fprintf(stderr, "done\n");
+ if (retval != 0) {
+ multi_ack = 0;
+ flushes++;
+ }
+ strbuf_release(&req_buf);
+
+ consume_shallow_list(args, fd[0]);
+ while (flushes || multi_ack) {
+ int ack = get_ack(fd[0], result_sha1);
+ if (ack) {
+ if (args->verbose)
+ fprintf(stderr, "got ack (%d) %s\n", ack,
+ sha1_to_hex(result_sha1));
+ if (ack == ACK)
+ return 0;
+ multi_ack = 1;
+ continue;
+ }
+ flushes--;
+ }
+ /* it is no error to fetch into a completely empty repo */
+ return count ? retval : 0;
+}
+
+static struct commit_list *complete;
+
+static int mark_complete(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
+{
+ struct object *o = parse_object(sha1);
+
+ while (o && o->type == OBJ_TAG) {
+ struct tag *t = (struct tag *) o;
+ if (!t->tagged)
+ break; /* broken repository */
+ o->flags |= COMPLETE;
+ o = parse_object(t->tagged->sha1);
+ }
+ if (o && o->type == OBJ_COMMIT) {
+ struct commit *commit = (struct commit *)o;
+ if (!(commit->object.flags & COMPLETE)) {
+ commit->object.flags |= COMPLETE;
+ commit_list_insert_by_date(commit, &complete);
+ }
+ }
+ return 0;
+}
+
+static void mark_recent_complete_commits(struct fetch_pack_args *args,
+ unsigned long cutoff)
+{
+ while (complete && cutoff <= complete->item->date) {
+ if (args->verbose)
+ fprintf(stderr, "Marking %s as complete\n",
+ sha1_to_hex(complete->item->object.sha1));
+ pop_most_recent_commit(&complete, COMPLETE);
+ }
+}
+
+static int non_matching_ref(struct string_list_item *item, void *unused)
+{
+ if (item->util) {
+ item->util = NULL;
+ return 0;
+ }
+ else
+ return 1;
+}
+
+static void filter_refs(struct fetch_pack_args *args,
+ struct ref **refs, struct string_list *sought)
+{
+ struct ref *newlist = NULL;
+ struct ref **newtail = &newlist;
+ struct ref *ref, *next;
+ int sought_pos;
+
+ sought_pos = 0;
+ for (ref = *refs; ref; ref = next) {
+ int keep = 0;
+ next = ref->next;
+ if (!memcmp(ref->name, "refs/", 5) &&
+ check_refname_format(ref->name + 5, 0))
+ ; /* trash */
+ else {
+ while (sought_pos < sought->nr) {
+ int cmp = strcmp(ref->name, sought->items[sought_pos].string);
+ if (cmp < 0)
+ break; /* definitely do not have it */
+ else if (cmp == 0) {
+ keep = 1; /* definitely have it */
+ sought->items[sought_pos++].util = "matched";
+ break;
+ }
+ else
+ sought_pos++; /* might have it; keep looking */
+ }
+ }
+
+ if (! keep && args->fetch_all &&
+ (!args->depth || prefixcmp(ref->name, "refs/tags/")))
+ keep = 1;
+
+ if (keep) {
+ *newtail = ref;
+ ref->next = NULL;
+ newtail = &ref->next;
+ } else {
+ free(ref);
+ }
+ }
+
+ filter_string_list(sought, 0, non_matching_ref, NULL);
+ *refs = newlist;
+}
+
+static void mark_alternate_complete(const struct ref *ref, void *unused)
+{
+ mark_complete(NULL, ref->old_sha1, 0, NULL);
+}
+
+static int everything_local(struct fetch_pack_args *args,
+ struct ref **refs, struct string_list *sought)
+{
+ struct ref *ref;
+ int retval;
+ unsigned long cutoff = 0;
+
+ save_commit_buffer = 0;
+
+ for (ref = *refs; ref; ref = ref->next) {
+ struct object *o;
+
+ o = parse_object(ref->old_sha1);
+ if (!o)
+ continue;
+
+ /* We already have it -- which may mean that we were
+ * in sync with the other side at some time after
+ * that (it is OK if we guess wrong here).
+ */
+ if (o->type == OBJ_COMMIT) {
+ struct commit *commit = (struct commit *)o;
+ if (!cutoff || cutoff < commit->date)
+ cutoff = commit->date;
+ }
+ }
+
+ if (!args->depth) {
+ for_each_ref(mark_complete, NULL);
+ for_each_alternate_ref(mark_alternate_complete, NULL);
+ if (cutoff)
+ mark_recent_complete_commits(args, cutoff);
+ }
+
+ /*
+ * Mark all complete remote refs as common refs.
+ * Don't mark them common yet; the server has to be told so first.
+ */
+ for (ref = *refs; ref; ref = ref->next) {
+ struct object *o = deref_tag(lookup_object(ref->old_sha1),
+ NULL, 0);
+
+ if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
+ continue;
+
+ if (!(o->flags & SEEN)) {
+ rev_list_push((struct commit *)o, COMMON_REF | SEEN);
+
+ mark_common((struct commit *)o, 1, 1);
+ }
+ }
+
+ filter_refs(args, refs, sought);
+
+ for (retval = 1, ref = *refs; ref ; ref = ref->next) {
+ const unsigned char *remote = ref->old_sha1;
+ unsigned char local[20];
+ struct object *o;
+
+ o = lookup_object(remote);
+ if (!o || !(o->flags & COMPLETE)) {
+ retval = 0;
+ if (!args->verbose)
+ continue;
+ fprintf(stderr,
+ "want %s (%s)\n", sha1_to_hex(remote),
+ ref->name);
+ continue;
+ }
+
+ hashcpy(ref->new_sha1, local);
+ if (!args->verbose)
+ continue;
+ fprintf(stderr,
+ "already have %s (%s)\n", sha1_to_hex(remote),
+ ref->name);
+ }
+ return retval;
+}
+
+static int sideband_demux(int in, int out, void *data)
+{
+ int *xd = data;
+
+ int ret = recv_sideband("fetch-pack", xd[0], out);
+ close(out);
+ return ret;
+}
+
+static int get_pack(struct fetch_pack_args *args,
+ int xd[2], char **pack_lockfile)
+{
+ struct async demux;
+ const char *argv[20];
+ char keep_arg[256];
+ char hdr_arg[256];
+ const char **av;
+ int do_keep = args->keep_pack;
+ struct child_process cmd;
+
+ memset(&demux, 0, sizeof(demux));
+ if (use_sideband) {
+ /* xd[] is talking with upload-pack; subprocess reads from
+ * xd[0], spits out band#2 to stderr, and feeds us band#1
+ * through demux->out.
+ */
+ demux.proc = sideband_demux;
+ demux.data = xd;
+ demux.out = -1;
+ if (start_async(&demux))
+ die("fetch-pack: unable to fork off sideband"
+ " demultiplexer");
+ }
+ else
+ demux.out = xd[0];
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.argv = argv;
+ av = argv;
+ *hdr_arg = 0;
+ if (!args->keep_pack && unpack_limit) {
+ struct pack_header header;
+
+ if (read_pack_header(demux.out, &header))
+ die("protocol error: bad pack header");
+ snprintf(hdr_arg, sizeof(hdr_arg),
+ "--pack_header=%"PRIu32",%"PRIu32,
+ ntohl(header.hdr_version), ntohl(header.hdr_entries));
+ if (ntohl(header.hdr_entries) < unpack_limit)
+ do_keep = 0;
+ else
+ do_keep = 1;
+ }
+
+ if (do_keep) {
+ if (pack_lockfile)
+ cmd.out = -1;
+ *av++ = "index-pack";
+ *av++ = "--stdin";
+ if (!args->quiet && !args->no_progress)
+ *av++ = "-v";
+ if (args->use_thin_pack)
+ *av++ = "--fix-thin";
+ if (args->lock_pack || unpack_limit) {
+ int s = sprintf(keep_arg,
+ "--keep=fetch-pack %"PRIuMAX " on ", (uintmax_t) getpid());
+ if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
+ strcpy(keep_arg + s, "localhost");
+ *av++ = keep_arg;
+ }
+ }
+ else {
+ *av++ = "unpack-objects";
+ if (args->quiet || args->no_progress)
+ *av++ = "-q";
+ }
+ if (*hdr_arg)
+ *av++ = hdr_arg;
+ if (fetch_fsck_objects >= 0
+ ? fetch_fsck_objects
+ : transfer_fsck_objects >= 0
+ ? transfer_fsck_objects
+ : 0)
+ *av++ = "--strict";
+ *av++ = NULL;
+
+ cmd.in = demux.out;
+ cmd.git_cmd = 1;
+ if (start_command(&cmd))
+ die("fetch-pack: unable to fork off %s", argv[0]);
+ if (do_keep && pack_lockfile) {
+ *pack_lockfile = index_pack_lockfile(cmd.out);
+ close(cmd.out);
+ }
+
+ if (finish_command(&cmd))
+ die("%s failed", argv[0]);
+ if (use_sideband && finish_async(&demux))
+ die("error in sideband demultiplexer");
+ return 0;
+}
+
+static struct ref *do_fetch_pack(struct fetch_pack_args *args,
+ int fd[2],
+ const struct ref *orig_ref,
+ struct string_list *sought,
+ char **pack_lockfile)
+{
+ struct ref *ref = copy_ref_list(orig_ref);
+ unsigned char sha1[20];
+ const char *agent_feature;
+ int agent_len;
+
+ sort_ref_list(&ref, ref_compare_name);
+
+ if (is_repository_shallow() && !server_supports("shallow"))
+ die("Server does not support shallow clients");
+ if (server_supports("multi_ack_detailed")) {
+ if (args->verbose)
+ fprintf(stderr, "Server supports multi_ack_detailed\n");
+ multi_ack = 2;
+ if (server_supports("no-done")) {
+ if (args->verbose)
+ fprintf(stderr, "Server supports no-done\n");
+ if (args->stateless_rpc)
+ no_done = 1;
+ }
+ }
+ else if (server_supports("multi_ack")) {
+ if (args->verbose)
+ fprintf(stderr, "Server supports multi_ack\n");
+ multi_ack = 1;
+ }
+ if (server_supports("side-band-64k")) {
+ if (args->verbose)
+ fprintf(stderr, "Server supports side-band-64k\n");
+ use_sideband = 2;
+ }
+ else if (server_supports("side-band")) {
+ if (args->verbose)
+ fprintf(stderr, "Server supports side-band\n");
+ use_sideband = 1;
+ }
+ if (!server_supports("thin-pack"))
+ args->use_thin_pack = 0;
+ if (!server_supports("no-progress"))
+ args->no_progress = 0;
+ if (!server_supports("include-tag"))
+ args->include_tag = 0;
+ if (server_supports("ofs-delta")) {
+ if (args->verbose)
+ fprintf(stderr, "Server supports ofs-delta\n");
+ } else
+ prefer_ofs_delta = 0;
+
+ if ((agent_feature = server_feature_value("agent", &agent_len))) {
+ agent_supported = 1;
+ if (args->verbose && agent_len)
+ fprintf(stderr, "Server version is %.*s\n",
+ agent_len, agent_feature);
+ }
+
+ if (everything_local(args, &ref, sought)) {
+ packet_flush(fd[1]);
+ goto all_done;
+ }
+ if (find_common(args, fd, sha1, ref) < 0)
+ if (!args->keep_pack)
+ /* When cloning, it is not unusual to have
+ * no common commit.
+ */
+ warning("no common commits");
+
+ if (args->stateless_rpc)
+ packet_flush(fd[1]);
+ if (get_pack(args, fd, pack_lockfile))
+ die("git fetch-pack: fetch failed.");
+
+ all_done:
+ return ref;
+}
+
+static int fetch_pack_config(const char *var, const char *value, void *cb)
+{
+ if (strcmp(var, "fetch.unpacklimit") == 0) {
+ fetch_unpack_limit = git_config_int(var, value);
+ return 0;
+ }
+
+ if (strcmp(var, "transfer.unpacklimit") == 0) {
+ transfer_unpack_limit = git_config_int(var, value);
+ return 0;
+ }
+
+ if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
+ prefer_ofs_delta = git_config_bool(var, value);
+ return 0;
+ }
+
+ if (!strcmp(var, "fetch.fsckobjects")) {
+ fetch_fsck_objects = git_config_bool(var, value);
+ return 0;
+ }
+
+ if (!strcmp(var, "transfer.fsckobjects")) {
+ transfer_fsck_objects = git_config_bool(var, value);
+ return 0;
+ }
+
+ return git_default_config(var, value, cb);
+}
+
+static struct lock_file lock;
+
+static void fetch_pack_setup(void)
+{
+ static int did_setup;
+ if (did_setup)
+ return;
+ git_config(fetch_pack_config, NULL);
+ if (0 <= transfer_unpack_limit)
+ unpack_limit = transfer_unpack_limit;
+ else if (0 <= fetch_unpack_limit)
+ unpack_limit = fetch_unpack_limit;
+ did_setup = 1;
+}
+
+struct ref *fetch_pack(struct fetch_pack_args *args,
+ int fd[], struct child_process *conn,
+ const struct ref *ref,
+ const char *dest,
+ struct string_list *sought,
+ char **pack_lockfile)
+{
+ struct stat st;
+ struct ref *ref_cpy;
+
+ fetch_pack_setup();
+ if (args->depth > 0) {
+ if (stat(git_path("shallow"), &st))
+ st.st_mtime = 0;
+ }
+
+ if (sought->nr) {
+ sort_string_list(sought);
+ string_list_remove_duplicates(sought, 0);
+ }
+
+ if (!ref) {
+ packet_flush(fd[1]);
+ die("no matching remote head");
+ }
+ ref_cpy = do_fetch_pack(args, fd, ref, sought, pack_lockfile);
+
+ if (args->depth > 0) {
+ struct cache_time mtime;
+ struct strbuf sb = STRBUF_INIT;
+ char *shallow = git_path("shallow");
+ int fd;
+
+ mtime.sec = st.st_mtime;
+ mtime.nsec = ST_MTIME_NSEC(st);
+ if (stat(shallow, &st)) {
+ if (mtime.sec)
+ die("shallow file was removed during fetch");
+ } else if (st.st_mtime != mtime.sec
+#ifdef USE_NSEC
+ || ST_MTIME_NSEC(st) != mtime.nsec
+#endif
+ )
+ die("shallow file was changed during fetch");
+
+ fd = hold_lock_file_for_update(&lock, shallow,
+ LOCK_DIE_ON_ERROR);
+ if (!write_shallow_commits(&sb, 0)
+ || write_in_full(fd, sb.buf, sb.len) != sb.len) {
+ unlink_or_warn(shallow);
+ rollback_lock_file(&lock);
+ } else {
+ commit_lock_file(&lock);
+ }
+ strbuf_release(&sb);
+ }
+
+ reprepare_packed_git();
+ return ref_cpy;
+}
