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synced 2024-08-27 11:39:22 +00:00
![Nguyễn Thái Ngọc Duy](/assets/img/avatar_default.png)
resolve_ref() may return a pointer to a static buffer. Callers that use this value longer than a couple of statements should copy the value to avoid some hidden resolve_ref() call that may change the static buffer's value. The bug found by Tony Wang <wwwjfy@gmail.com> in builtin/merge.c demonstrates this. The first call is in cmd_merge() branch = resolve_ref("HEAD", head_sha1, 0, &flag); Then deep in lookup_commit_or_die() a few lines after, resolve_ref() may be called again and destroy "branch". lookup_commit_or_die lookup_commit_reference lookup_commit_reference_gently parse_object lookup_replace_object do_lookup_replace_object prepare_replace_object for_each_replace_ref do_for_each_ref get_loose_refs get_ref_dir get_ref_dir resolve_ref All call sites are checked and made sure that xstrdup() is called if the value should be saved. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
976 lines
24 KiB
C
976 lines
24 KiB
C
#include "builtin.h"
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#include "pack.h"
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#include "refs.h"
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#include "pkt-line.h"
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#include "sideband.h"
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#include "run-command.h"
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#include "exec_cmd.h"
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#include "commit.h"
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#include "object.h"
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#include "remote.h"
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#include "transport.h"
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#include "string-list.h"
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#include "sha1-array.h"
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#include "connected.h"
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static const char receive_pack_usage[] = "git receive-pack <git-dir>";
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enum deny_action {
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DENY_UNCONFIGURED,
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DENY_IGNORE,
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DENY_WARN,
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DENY_REFUSE
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};
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static int deny_deletes;
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static int deny_non_fast_forwards;
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static enum deny_action deny_current_branch = DENY_UNCONFIGURED;
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static enum deny_action deny_delete_current = DENY_UNCONFIGURED;
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static int receive_fsck_objects = -1;
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static int transfer_fsck_objects = -1;
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static int receive_unpack_limit = -1;
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static int transfer_unpack_limit = -1;
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static int unpack_limit = 100;
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static int report_status;
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static int use_sideband;
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static int prefer_ofs_delta = 1;
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static int auto_update_server_info;
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static int auto_gc = 1;
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static const char *head_name;
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static int sent_capabilities;
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static enum deny_action parse_deny_action(const char *var, const char *value)
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{
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if (value) {
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if (!strcasecmp(value, "ignore"))
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return DENY_IGNORE;
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if (!strcasecmp(value, "warn"))
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return DENY_WARN;
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if (!strcasecmp(value, "refuse"))
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return DENY_REFUSE;
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}
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if (git_config_bool(var, value))
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return DENY_REFUSE;
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return DENY_IGNORE;
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}
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static int receive_pack_config(const char *var, const char *value, void *cb)
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{
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if (strcmp(var, "receive.denydeletes") == 0) {
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deny_deletes = git_config_bool(var, value);
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return 0;
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}
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if (strcmp(var, "receive.denynonfastforwards") == 0) {
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deny_non_fast_forwards = git_config_bool(var, value);
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return 0;
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}
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if (strcmp(var, "receive.unpacklimit") == 0) {
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receive_unpack_limit = git_config_int(var, value);
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return 0;
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}
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if (strcmp(var, "transfer.unpacklimit") == 0) {
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transfer_unpack_limit = git_config_int(var, value);
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return 0;
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}
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if (strcmp(var, "receive.fsckobjects") == 0) {
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receive_fsck_objects = git_config_bool(var, value);
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return 0;
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}
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if (strcmp(var, "transfer.fsckobjects") == 0) {
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transfer_fsck_objects = git_config_bool(var, value);
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return 0;
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}
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if (!strcmp(var, "receive.denycurrentbranch")) {
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deny_current_branch = parse_deny_action(var, value);
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return 0;
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}
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if (strcmp(var, "receive.denydeletecurrent") == 0) {
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deny_delete_current = parse_deny_action(var, value);
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return 0;
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}
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if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
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prefer_ofs_delta = git_config_bool(var, value);
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return 0;
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}
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if (strcmp(var, "receive.updateserverinfo") == 0) {
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auto_update_server_info = git_config_bool(var, value);
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return 0;
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}
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if (strcmp(var, "receive.autogc") == 0) {
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auto_gc = git_config_bool(var, value);
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return 0;
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}
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return git_default_config(var, value, cb);
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}
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static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
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{
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if (sent_capabilities)
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packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
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else
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packet_write(1, "%s %s%c%s%s\n",
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sha1_to_hex(sha1), path, 0,
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" report-status delete-refs side-band-64k",
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prefer_ofs_delta ? " ofs-delta" : "");
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sent_capabilities = 1;
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return 0;
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}
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static int show_ref_cb(const char *path, const unsigned char *sha1, int flag, void *cb_data)
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{
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path = strip_namespace(path);
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/*
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* Advertise refs outside our current namespace as ".have"
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* refs, so that the client can use them to minimize data
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* transfer but will otherwise ignore them. This happens to
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* cover ".have" that are thrown in by add_one_alternate_ref()
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* to mark histories that are complete in our alternates as
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* well.
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*/
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if (!path)
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path = ".have";
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return show_ref(path, sha1, flag, cb_data);
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}
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static void write_head_info(void)
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{
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for_each_ref(show_ref_cb, NULL);
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if (!sent_capabilities)
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show_ref("capabilities^{}", null_sha1, 0, NULL);
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}
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struct command {
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struct command *next;
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const char *error_string;
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unsigned int skip_update:1,
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did_not_exist:1;
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unsigned char old_sha1[20];
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unsigned char new_sha1[20];
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char ref_name[FLEX_ARRAY]; /* more */
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};
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static const char pre_receive_hook[] = "hooks/pre-receive";
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static const char post_receive_hook[] = "hooks/post-receive";
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static void rp_error(const char *err, ...) __attribute__((format (printf, 1, 2)));
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static void rp_warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
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static void report_message(const char *prefix, const char *err, va_list params)
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{
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int sz = strlen(prefix);
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char msg[4096];
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strncpy(msg, prefix, sz);
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sz += vsnprintf(msg + sz, sizeof(msg) - sz, err, params);
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if (sz > (sizeof(msg) - 1))
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sz = sizeof(msg) - 1;
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msg[sz++] = '\n';
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if (use_sideband)
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send_sideband(1, 2, msg, sz, use_sideband);
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else
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xwrite(2, msg, sz);
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}
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static void rp_warning(const char *err, ...)
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{
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va_list params;
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va_start(params, err);
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report_message("warning: ", err, params);
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va_end(params);
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}
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static void rp_error(const char *err, ...)
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{
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va_list params;
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va_start(params, err);
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report_message("error: ", err, params);
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va_end(params);
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}
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static int copy_to_sideband(int in, int out, void *arg)
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{
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char data[128];
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while (1) {
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ssize_t sz = xread(in, data, sizeof(data));
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if (sz <= 0)
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break;
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send_sideband(1, 2, data, sz, use_sideband);
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}
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close(in);
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return 0;
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}
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typedef int (*feed_fn)(void *, const char **, size_t *);
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static int run_and_feed_hook(const char *hook_name, feed_fn feed, void *feed_state)
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{
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struct child_process proc;
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struct async muxer;
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const char *argv[2];
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int code;
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if (access(hook_name, X_OK) < 0)
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return 0;
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argv[0] = hook_name;
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argv[1] = NULL;
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memset(&proc, 0, sizeof(proc));
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proc.argv = argv;
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proc.in = -1;
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proc.stdout_to_stderr = 1;
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if (use_sideband) {
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memset(&muxer, 0, sizeof(muxer));
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muxer.proc = copy_to_sideband;
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muxer.in = -1;
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code = start_async(&muxer);
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if (code)
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return code;
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proc.err = muxer.in;
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}
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code = start_command(&proc);
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if (code) {
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if (use_sideband)
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finish_async(&muxer);
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return code;
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}
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while (1) {
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const char *buf;
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size_t n;
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if (feed(feed_state, &buf, &n))
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break;
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if (write_in_full(proc.in, buf, n) != n)
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break;
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}
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close(proc.in);
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if (use_sideband)
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finish_async(&muxer);
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return finish_command(&proc);
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}
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struct receive_hook_feed_state {
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struct command *cmd;
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int skip_broken;
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struct strbuf buf;
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};
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static int feed_receive_hook(void *state_, const char **bufp, size_t *sizep)
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{
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struct receive_hook_feed_state *state = state_;
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struct command *cmd = state->cmd;
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while (cmd &&
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state->skip_broken && (cmd->error_string || cmd->did_not_exist))
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cmd = cmd->next;
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if (!cmd)
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return -1; /* EOF */
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strbuf_reset(&state->buf);
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strbuf_addf(&state->buf, "%s %s %s\n",
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sha1_to_hex(cmd->old_sha1), sha1_to_hex(cmd->new_sha1),
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cmd->ref_name);
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state->cmd = cmd->next;
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if (bufp) {
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*bufp = state->buf.buf;
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*sizep = state->buf.len;
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}
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return 0;
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}
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static int run_receive_hook(struct command *commands, const char *hook_name,
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int skip_broken)
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{
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struct receive_hook_feed_state state;
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int status;
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strbuf_init(&state.buf, 0);
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state.cmd = commands;
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state.skip_broken = skip_broken;
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if (feed_receive_hook(&state, NULL, NULL))
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return 0;
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state.cmd = commands;
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status = run_and_feed_hook(hook_name, feed_receive_hook, &state);
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strbuf_release(&state.buf);
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return status;
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}
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static int run_update_hook(struct command *cmd)
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{
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static const char update_hook[] = "hooks/update";
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const char *argv[5];
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struct child_process proc;
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int code;
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if (access(update_hook, X_OK) < 0)
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return 0;
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argv[0] = update_hook;
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argv[1] = cmd->ref_name;
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argv[2] = sha1_to_hex(cmd->old_sha1);
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argv[3] = sha1_to_hex(cmd->new_sha1);
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argv[4] = NULL;
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memset(&proc, 0, sizeof(proc));
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proc.no_stdin = 1;
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proc.stdout_to_stderr = 1;
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proc.err = use_sideband ? -1 : 0;
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proc.argv = argv;
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code = start_command(&proc);
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if (code)
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return code;
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if (use_sideband)
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copy_to_sideband(proc.err, -1, NULL);
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return finish_command(&proc);
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}
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static int is_ref_checked_out(const char *ref)
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{
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if (is_bare_repository())
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return 0;
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if (!head_name)
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return 0;
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return !strcmp(head_name, ref);
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}
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static char *refuse_unconfigured_deny_msg[] = {
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"By default, updating the current branch in a non-bare repository",
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"is denied, because it will make the index and work tree inconsistent",
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"with what you pushed, and will require 'git reset --hard' to match",
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"the work tree to HEAD.",
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"",
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"You can set 'receive.denyCurrentBranch' configuration variable to",
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"'ignore' or 'warn' in the remote repository to allow pushing into",
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"its current branch; however, this is not recommended unless you",
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"arranged to update its work tree to match what you pushed in some",
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"other way.",
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"",
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"To squelch this message and still keep the default behaviour, set",
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"'receive.denyCurrentBranch' configuration variable to 'refuse'."
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};
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static void refuse_unconfigured_deny(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(refuse_unconfigured_deny_msg); i++)
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rp_error("%s", refuse_unconfigured_deny_msg[i]);
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}
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static char *refuse_unconfigured_deny_delete_current_msg[] = {
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"By default, deleting the current branch is denied, because the next",
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"'git clone' won't result in any file checked out, causing confusion.",
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"",
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"You can set 'receive.denyDeleteCurrent' configuration variable to",
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"'warn' or 'ignore' in the remote repository to allow deleting the",
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"current branch, with or without a warning message.",
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"",
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"To squelch this message, you can set it to 'refuse'."
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};
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static void refuse_unconfigured_deny_delete_current(void)
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{
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int i;
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for (i = 0;
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i < ARRAY_SIZE(refuse_unconfigured_deny_delete_current_msg);
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i++)
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rp_error("%s", refuse_unconfigured_deny_delete_current_msg[i]);
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}
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static const char *update(struct command *cmd)
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{
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const char *name = cmd->ref_name;
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struct strbuf namespaced_name_buf = STRBUF_INIT;
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const char *namespaced_name;
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unsigned char *old_sha1 = cmd->old_sha1;
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unsigned char *new_sha1 = cmd->new_sha1;
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struct ref_lock *lock;
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/* only refs/... are allowed */
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if (prefixcmp(name, "refs/") || check_refname_format(name + 5, 0)) {
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rp_error("refusing to create funny ref '%s' remotely", name);
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return "funny refname";
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}
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strbuf_addf(&namespaced_name_buf, "%s%s", get_git_namespace(), name);
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namespaced_name = strbuf_detach(&namespaced_name_buf, NULL);
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if (is_ref_checked_out(namespaced_name)) {
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switch (deny_current_branch) {
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case DENY_IGNORE:
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break;
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case DENY_WARN:
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rp_warning("updating the current branch");
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break;
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case DENY_REFUSE:
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case DENY_UNCONFIGURED:
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rp_error("refusing to update checked out branch: %s", name);
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if (deny_current_branch == DENY_UNCONFIGURED)
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refuse_unconfigured_deny();
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return "branch is currently checked out";
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}
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}
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if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
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error("unpack should have generated %s, "
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"but I can't find it!", sha1_to_hex(new_sha1));
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return "bad pack";
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}
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if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
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if (deny_deletes && !prefixcmp(name, "refs/heads/")) {
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rp_error("denying ref deletion for %s", name);
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return "deletion prohibited";
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}
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if (!strcmp(namespaced_name, head_name)) {
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switch (deny_delete_current) {
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case DENY_IGNORE:
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break;
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case DENY_WARN:
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rp_warning("deleting the current branch");
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break;
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case DENY_REFUSE:
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case DENY_UNCONFIGURED:
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if (deny_delete_current == DENY_UNCONFIGURED)
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refuse_unconfigured_deny_delete_current();
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rp_error("refusing to delete the current branch: %s", name);
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return "deletion of the current branch prohibited";
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}
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}
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}
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|
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if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
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!is_null_sha1(old_sha1) &&
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!prefixcmp(name, "refs/heads/")) {
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struct object *old_object, *new_object;
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struct commit *old_commit, *new_commit;
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struct commit_list *bases, *ent;
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old_object = parse_object(old_sha1);
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new_object = parse_object(new_sha1);
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if (!old_object || !new_object ||
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old_object->type != OBJ_COMMIT ||
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new_object->type != OBJ_COMMIT) {
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error("bad sha1 objects for %s", name);
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return "bad ref";
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}
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old_commit = (struct commit *)old_object;
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new_commit = (struct commit *)new_object;
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bases = get_merge_bases(old_commit, new_commit, 1);
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for (ent = bases; ent; ent = ent->next)
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if (!hashcmp(old_sha1, ent->item->object.sha1))
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break;
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free_commit_list(bases);
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if (!ent) {
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rp_error("denying non-fast-forward %s"
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" (you should pull first)", name);
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return "non-fast-forward";
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}
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}
|
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if (run_update_hook(cmd)) {
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rp_error("hook declined to update %s", name);
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return "hook declined";
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}
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|
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if (is_null_sha1(new_sha1)) {
|
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if (!parse_object(old_sha1)) {
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old_sha1 = NULL;
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|
if (ref_exists(name)) {
|
|
rp_warning("Allowing deletion of corrupt ref.");
|
|
} else {
|
|
rp_warning("Deleting a non-existent ref.");
|
|
cmd->did_not_exist = 1;
|
|
}
|
|
}
|
|
if (delete_ref(namespaced_name, old_sha1, 0)) {
|
|
rp_error("failed to delete %s", name);
|
|
return "failed to delete";
|
|
}
|
|
return NULL; /* good */
|
|
}
|
|
else {
|
|
lock = lock_any_ref_for_update(namespaced_name, old_sha1, 0);
|
|
if (!lock) {
|
|
rp_error("failed to lock %s", name);
|
|
return "failed to lock";
|
|
}
|
|
if (write_ref_sha1(lock, new_sha1, "push")) {
|
|
return "failed to write"; /* error() already called */
|
|
}
|
|
return NULL; /* good */
|
|
}
|
|
}
|
|
|
|
static char update_post_hook[] = "hooks/post-update";
|
|
|
|
static void run_update_post_hook(struct command *commands)
|
|
{
|
|
struct command *cmd;
|
|
int argc;
|
|
const char **argv;
|
|
struct child_process proc;
|
|
|
|
for (argc = 0, cmd = commands; cmd; cmd = cmd->next) {
|
|
if (cmd->error_string || cmd->did_not_exist)
|
|
continue;
|
|
argc++;
|
|
}
|
|
if (!argc || access(update_post_hook, X_OK) < 0)
|
|
return;
|
|
argv = xmalloc(sizeof(*argv) * (2 + argc));
|
|
argv[0] = update_post_hook;
|
|
|
|
for (argc = 1, cmd = commands; cmd; cmd = cmd->next) {
|
|
char *p;
|
|
if (cmd->error_string || cmd->did_not_exist)
|
|
continue;
|
|
p = xmalloc(strlen(cmd->ref_name) + 1);
|
|
strcpy(p, cmd->ref_name);
|
|
argv[argc] = p;
|
|
argc++;
|
|
}
|
|
argv[argc] = NULL;
|
|
|
|
memset(&proc, 0, sizeof(proc));
|
|
proc.no_stdin = 1;
|
|
proc.stdout_to_stderr = 1;
|
|
proc.err = use_sideband ? -1 : 0;
|
|
proc.argv = argv;
|
|
|
|
if (!start_command(&proc)) {
|
|
if (use_sideband)
|
|
copy_to_sideband(proc.err, -1, NULL);
|
|
finish_command(&proc);
|
|
}
|
|
}
|
|
|
|
static void check_aliased_update(struct command *cmd, struct string_list *list)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
const char *dst_name;
|
|
struct string_list_item *item;
|
|
struct command *dst_cmd;
|
|
unsigned char sha1[20];
|
|
char cmd_oldh[41], cmd_newh[41], dst_oldh[41], dst_newh[41];
|
|
int flag;
|
|
|
|
strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
|
|
dst_name = resolve_ref(buf.buf, sha1, 0, &flag);
|
|
strbuf_release(&buf);
|
|
|
|
if (!(flag & REF_ISSYMREF))
|
|
return;
|
|
|
|
dst_name = strip_namespace(dst_name);
|
|
if (!dst_name) {
|
|
rp_error("refusing update to broken symref '%s'", cmd->ref_name);
|
|
cmd->skip_update = 1;
|
|
cmd->error_string = "broken symref";
|
|
return;
|
|
}
|
|
|
|
if ((item = string_list_lookup(list, dst_name)) == NULL)
|
|
return;
|
|
|
|
cmd->skip_update = 1;
|
|
|
|
dst_cmd = (struct command *) item->util;
|
|
|
|
if (!hashcmp(cmd->old_sha1, dst_cmd->old_sha1) &&
|
|
!hashcmp(cmd->new_sha1, dst_cmd->new_sha1))
|
|
return;
|
|
|
|
dst_cmd->skip_update = 1;
|
|
|
|
strcpy(cmd_oldh, find_unique_abbrev(cmd->old_sha1, DEFAULT_ABBREV));
|
|
strcpy(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
|
|
strcpy(dst_oldh, find_unique_abbrev(dst_cmd->old_sha1, DEFAULT_ABBREV));
|
|
strcpy(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
|
|
rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
|
|
" its target '%s' (%s..%s)",
|
|
cmd->ref_name, cmd_oldh, cmd_newh,
|
|
dst_cmd->ref_name, dst_oldh, dst_newh);
|
|
|
|
cmd->error_string = dst_cmd->error_string =
|
|
"inconsistent aliased update";
|
|
}
|
|
|
|
static void check_aliased_updates(struct command *commands)
|
|
{
|
|
struct command *cmd;
|
|
struct string_list ref_list = STRING_LIST_INIT_NODUP;
|
|
|
|
for (cmd = commands; cmd; cmd = cmd->next) {
|
|
struct string_list_item *item =
|
|
string_list_append(&ref_list, cmd->ref_name);
|
|
item->util = (void *)cmd;
|
|
}
|
|
sort_string_list(&ref_list);
|
|
|
|
for (cmd = commands; cmd; cmd = cmd->next)
|
|
check_aliased_update(cmd, &ref_list);
|
|
|
|
string_list_clear(&ref_list, 0);
|
|
}
|
|
|
|
static int command_singleton_iterator(void *cb_data, unsigned char sha1[20])
|
|
{
|
|
struct command **cmd_list = cb_data;
|
|
struct command *cmd = *cmd_list;
|
|
|
|
if (!cmd || is_null_sha1(cmd->new_sha1))
|
|
return -1; /* end of list */
|
|
*cmd_list = NULL; /* this returns only one */
|
|
hashcpy(sha1, cmd->new_sha1);
|
|
return 0;
|
|
}
|
|
|
|
static void set_connectivity_errors(struct command *commands)
|
|
{
|
|
struct command *cmd;
|
|
|
|
for (cmd = commands; cmd; cmd = cmd->next) {
|
|
struct command *singleton = cmd;
|
|
if (!check_everything_connected(command_singleton_iterator,
|
|
0, &singleton))
|
|
continue;
|
|
cmd->error_string = "missing necessary objects";
|
|
}
|
|
}
|
|
|
|
static int iterate_receive_command_list(void *cb_data, unsigned char sha1[20])
|
|
{
|
|
struct command **cmd_list = cb_data;
|
|
struct command *cmd = *cmd_list;
|
|
|
|
while (cmd) {
|
|
if (!is_null_sha1(cmd->new_sha1)) {
|
|
hashcpy(sha1, cmd->new_sha1);
|
|
*cmd_list = cmd->next;
|
|
return 0;
|
|
}
|
|
cmd = cmd->next;
|
|
}
|
|
*cmd_list = NULL;
|
|
return -1; /* end of list */
|
|
}
|
|
|
|
static void execute_commands(struct command *commands, const char *unpacker_error)
|
|
{
|
|
struct command *cmd;
|
|
unsigned char sha1[20];
|
|
|
|
if (unpacker_error) {
|
|
for (cmd = commands; cmd; cmd = cmd->next)
|
|
cmd->error_string = "n/a (unpacker error)";
|
|
return;
|
|
}
|
|
|
|
cmd = commands;
|
|
if (check_everything_connected(iterate_receive_command_list,
|
|
0, &cmd))
|
|
set_connectivity_errors(commands);
|
|
|
|
if (run_receive_hook(commands, pre_receive_hook, 0)) {
|
|
for (cmd = commands; cmd; cmd = cmd->next)
|
|
cmd->error_string = "pre-receive hook declined";
|
|
return;
|
|
}
|
|
|
|
check_aliased_updates(commands);
|
|
|
|
free((char *)head_name);
|
|
head_name = resolve_ref("HEAD", sha1, 0, NULL);
|
|
if (head_name)
|
|
head_name = xstrdup(head_name);
|
|
|
|
for (cmd = commands; cmd; cmd = cmd->next)
|
|
if (!cmd->skip_update)
|
|
cmd->error_string = update(cmd);
|
|
}
|
|
|
|
static struct command *read_head_info(void)
|
|
{
|
|
struct command *commands = NULL;
|
|
struct command **p = &commands;
|
|
for (;;) {
|
|
static char line[1000];
|
|
unsigned char old_sha1[20], new_sha1[20];
|
|
struct command *cmd;
|
|
char *refname;
|
|
int len, reflen;
|
|
|
|
len = packet_read_line(0, line, sizeof(line));
|
|
if (!len)
|
|
break;
|
|
if (line[len-1] == '\n')
|
|
line[--len] = 0;
|
|
if (len < 83 ||
|
|
line[40] != ' ' ||
|
|
line[81] != ' ' ||
|
|
get_sha1_hex(line, old_sha1) ||
|
|
get_sha1_hex(line + 41, new_sha1))
|
|
die("protocol error: expected old/new/ref, got '%s'",
|
|
line);
|
|
|
|
refname = line + 82;
|
|
reflen = strlen(refname);
|
|
if (reflen + 82 < len) {
|
|
if (strstr(refname + reflen + 1, "report-status"))
|
|
report_status = 1;
|
|
if (strstr(refname + reflen + 1, "side-band-64k"))
|
|
use_sideband = LARGE_PACKET_MAX;
|
|
}
|
|
cmd = xcalloc(1, sizeof(struct command) + len - 80);
|
|
hashcpy(cmd->old_sha1, old_sha1);
|
|
hashcpy(cmd->new_sha1, new_sha1);
|
|
memcpy(cmd->ref_name, line + 82, len - 81);
|
|
*p = cmd;
|
|
p = &cmd->next;
|
|
}
|
|
return commands;
|
|
}
|
|
|
|
static const char *parse_pack_header(struct pack_header *hdr)
|
|
{
|
|
switch (read_pack_header(0, hdr)) {
|
|
case PH_ERROR_EOF:
|
|
return "eof before pack header was fully read";
|
|
|
|
case PH_ERROR_PACK_SIGNATURE:
|
|
return "protocol error (pack signature mismatch detected)";
|
|
|
|
case PH_ERROR_PROTOCOL:
|
|
return "protocol error (pack version unsupported)";
|
|
|
|
default:
|
|
return "unknown error in parse_pack_header";
|
|
|
|
case 0:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static const char *pack_lockfile;
|
|
|
|
static const char *unpack(void)
|
|
{
|
|
struct pack_header hdr;
|
|
const char *hdr_err;
|
|
char hdr_arg[38];
|
|
int fsck_objects = (receive_fsck_objects >= 0
|
|
? receive_fsck_objects
|
|
: transfer_fsck_objects >= 0
|
|
? transfer_fsck_objects
|
|
: 0);
|
|
|
|
hdr_err = parse_pack_header(&hdr);
|
|
if (hdr_err)
|
|
return hdr_err;
|
|
snprintf(hdr_arg, sizeof(hdr_arg),
|
|
"--pack_header=%"PRIu32",%"PRIu32,
|
|
ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
|
|
|
|
if (ntohl(hdr.hdr_entries) < unpack_limit) {
|
|
int code, i = 0;
|
|
const char *unpacker[4];
|
|
unpacker[i++] = "unpack-objects";
|
|
if (fsck_objects)
|
|
unpacker[i++] = "--strict";
|
|
unpacker[i++] = hdr_arg;
|
|
unpacker[i++] = NULL;
|
|
code = run_command_v_opt(unpacker, RUN_GIT_CMD);
|
|
if (!code)
|
|
return NULL;
|
|
return "unpack-objects abnormal exit";
|
|
} else {
|
|
const char *keeper[7];
|
|
int s, status, i = 0;
|
|
char keep_arg[256];
|
|
struct child_process ip;
|
|
|
|
s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
|
|
if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
|
|
strcpy(keep_arg + s, "localhost");
|
|
|
|
keeper[i++] = "index-pack";
|
|
keeper[i++] = "--stdin";
|
|
if (fsck_objects)
|
|
keeper[i++] = "--strict";
|
|
keeper[i++] = "--fix-thin";
|
|
keeper[i++] = hdr_arg;
|
|
keeper[i++] = keep_arg;
|
|
keeper[i++] = NULL;
|
|
memset(&ip, 0, sizeof(ip));
|
|
ip.argv = keeper;
|
|
ip.out = -1;
|
|
ip.git_cmd = 1;
|
|
status = start_command(&ip);
|
|
if (status) {
|
|
return "index-pack fork failed";
|
|
}
|
|
pack_lockfile = index_pack_lockfile(ip.out);
|
|
close(ip.out);
|
|
status = finish_command(&ip);
|
|
if (!status) {
|
|
reprepare_packed_git();
|
|
return NULL;
|
|
}
|
|
return "index-pack abnormal exit";
|
|
}
|
|
}
|
|
|
|
static void report(struct command *commands, const char *unpack_status)
|
|
{
|
|
struct command *cmd;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
|
|
packet_buf_write(&buf, "unpack %s\n",
|
|
unpack_status ? unpack_status : "ok");
|
|
for (cmd = commands; cmd; cmd = cmd->next) {
|
|
if (!cmd->error_string)
|
|
packet_buf_write(&buf, "ok %s\n",
|
|
cmd->ref_name);
|
|
else
|
|
packet_buf_write(&buf, "ng %s %s\n",
|
|
cmd->ref_name, cmd->error_string);
|
|
}
|
|
packet_buf_flush(&buf);
|
|
|
|
if (use_sideband)
|
|
send_sideband(1, 1, buf.buf, buf.len, use_sideband);
|
|
else
|
|
safe_write(1, buf.buf, buf.len);
|
|
strbuf_release(&buf);
|
|
}
|
|
|
|
static int delete_only(struct command *commands)
|
|
{
|
|
struct command *cmd;
|
|
for (cmd = commands; cmd; cmd = cmd->next) {
|
|
if (!is_null_sha1(cmd->new_sha1))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void add_one_alternate_sha1(const unsigned char sha1[20], void *unused)
|
|
{
|
|
add_extra_ref(".have", sha1, 0);
|
|
}
|
|
|
|
static void collect_one_alternate_ref(const struct ref *ref, void *data)
|
|
{
|
|
struct sha1_array *sa = data;
|
|
sha1_array_append(sa, ref->old_sha1);
|
|
}
|
|
|
|
static void add_alternate_refs(void)
|
|
{
|
|
struct sha1_array sa = SHA1_ARRAY_INIT;
|
|
for_each_alternate_ref(collect_one_alternate_ref, &sa);
|
|
sha1_array_for_each_unique(&sa, add_one_alternate_sha1, NULL);
|
|
sha1_array_clear(&sa);
|
|
}
|
|
|
|
int cmd_receive_pack(int argc, const char **argv, const char *prefix)
|
|
{
|
|
int advertise_refs = 0;
|
|
int stateless_rpc = 0;
|
|
int i;
|
|
char *dir = NULL;
|
|
struct command *commands;
|
|
|
|
packet_trace_identity("receive-pack");
|
|
|
|
argv++;
|
|
for (i = 1; i < argc; i++) {
|
|
const char *arg = *argv++;
|
|
|
|
if (*arg == '-') {
|
|
if (!strcmp(arg, "--advertise-refs")) {
|
|
advertise_refs = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--stateless-rpc")) {
|
|
stateless_rpc = 1;
|
|
continue;
|
|
}
|
|
|
|
usage(receive_pack_usage);
|
|
}
|
|
if (dir)
|
|
usage(receive_pack_usage);
|
|
dir = xstrdup(arg);
|
|
}
|
|
if (!dir)
|
|
usage(receive_pack_usage);
|
|
|
|
setup_path();
|
|
|
|
if (!enter_repo(dir, 0))
|
|
die("'%s' does not appear to be a git repository", dir);
|
|
|
|
if (is_repository_shallow())
|
|
die("attempt to push into a shallow repository");
|
|
|
|
git_config(receive_pack_config, NULL);
|
|
|
|
if (0 <= transfer_unpack_limit)
|
|
unpack_limit = transfer_unpack_limit;
|
|
else if (0 <= receive_unpack_limit)
|
|
unpack_limit = receive_unpack_limit;
|
|
|
|
if (advertise_refs || !stateless_rpc) {
|
|
add_alternate_refs();
|
|
write_head_info();
|
|
clear_extra_refs();
|
|
|
|
/* EOF */
|
|
packet_flush(1);
|
|
}
|
|
if (advertise_refs)
|
|
return 0;
|
|
|
|
if ((commands = read_head_info()) != NULL) {
|
|
const char *unpack_status = NULL;
|
|
|
|
if (!delete_only(commands))
|
|
unpack_status = unpack();
|
|
execute_commands(commands, unpack_status);
|
|
if (pack_lockfile)
|
|
unlink_or_warn(pack_lockfile);
|
|
if (report_status)
|
|
report(commands, unpack_status);
|
|
run_receive_hook(commands, post_receive_hook, 1);
|
|
run_update_post_hook(commands);
|
|
if (auto_gc) {
|
|
const char *argv_gc_auto[] = {
|
|
"gc", "--auto", "--quiet", NULL,
|
|
};
|
|
run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
|
|
}
|
|
if (auto_update_server_info)
|
|
update_server_info(0);
|
|
}
|
|
if (use_sideband)
|
|
packet_flush(1);
|
|
return 0;
|
|
}
|