mirror of
https://github.com/git/git
synced 2024-10-30 04:01:21 +00:00
f43cd49fb8
Sergey Vlasov, Andy Parkins and Alex Riesen all pointed out that it is possible for a single invocation of receive-pack to be given more refs than the OS might allow us to pass as command line parameters to a single hook invocation. We don't want to break these up into multiple invocations (like xargs might do) as that makes it impossible for the pre-receive hook to verify multiple related ref updates occur at the same time, and it makes it harder for post-receive to send out a single batch notification. Instead we pass the reference data on a pipe connected to the hook's stdin, supplying one ref per line to the hook. This way a single hook invocation can obtain an infinite amount of ref data, without bumping into any operating system limits. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
529 lines
12 KiB
C
529 lines
12 KiB
C
#include "cache.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 "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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static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
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static int deny_non_fast_forwards = 0;
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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 char capabilities[] = " report-status delete-refs ";
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static int capabilities_sent;
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static int receive_pack_config(const char *var, const char *value)
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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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return git_default_config(var, value);
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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 (capabilities_sent)
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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\n",
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sha1_to_hex(sha1), path, 0, capabilities);
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capabilities_sent = 1;
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return 0;
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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, NULL);
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if (!capabilities_sent)
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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 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 struct command *commands;
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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 int hook_status(int code, const char *hook_name)
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{
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switch (code) {
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case 0:
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return 0;
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case -ERR_RUN_COMMAND_FORK:
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return error("hook fork failed");
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case -ERR_RUN_COMMAND_EXEC:
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return error("hook execute failed");
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case -ERR_RUN_COMMAND_PIPE:
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return error("hook pipe failed");
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case -ERR_RUN_COMMAND_WAITPID:
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return error("waitpid failed");
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case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
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return error("waitpid is confused");
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case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
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return error("%s died of signal", hook_name);
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case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
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return error("%s died strangely", hook_name);
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default:
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error("%s exited with error code %d", hook_name, -code);
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return -code;
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}
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}
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static int run_hook(const char *hook_name)
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{
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static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
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struct command *cmd;
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struct child_process proc;
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const char *argv[2];
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int have_input = 0, code;
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for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
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if (!cmd->error_string)
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have_input = 1;
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}
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if (!have_input || 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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code = start_command(&proc);
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if (code)
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return hook_status(code, hook_name);
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for (cmd = commands; cmd; cmd = cmd->next) {
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if (!cmd->error_string) {
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size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
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sha1_to_hex(cmd->old_sha1),
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sha1_to_hex(cmd->new_sha1),
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cmd->ref_name);
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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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}
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return hook_status(finish_command(&proc), hook_name);
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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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struct child_process proc;
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const char *argv[5];
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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.argv = argv;
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proc.no_stdin = 1;
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proc.stdout_to_stderr = 1;
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return hook_status(run_command(&proc), update_hook);
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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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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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if (!prefixcmp(name, "refs/") && check_ref_format(name + 5)) {
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error("refusing to create funny ref '%s' locally", name);
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return "funny refname";
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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 (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 commit *old_commit, *new_commit;
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struct commit_list *bases, *ent;
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old_commit = (struct commit *)parse_object(old_sha1);
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new_commit = (struct commit *)parse_object(new_sha1);
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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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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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error("hook declined to update %s", name);
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return "hook declined";
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}
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if (is_null_sha1(new_sha1)) {
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if (delete_ref(name, old_sha1)) {
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error("failed to delete %s", name);
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return "failed to delete";
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}
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fprintf(stderr, "%s: %s -> deleted\n", name,
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sha1_to_hex(old_sha1));
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return NULL; /* good */
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}
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else {
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lock = lock_any_ref_for_update(name, old_sha1);
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if (!lock) {
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error("failed to lock %s", name);
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return "failed to lock";
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}
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if (write_ref_sha1(lock, new_sha1, "push")) {
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return "failed to write"; /* error() already called */
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}
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fprintf(stderr, "%s: %s -> %s\n", name,
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sha1_to_hex(old_sha1), sha1_to_hex(new_sha1));
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return NULL; /* good */
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}
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}
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static char update_post_hook[] = "hooks/post-update";
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static void run_update_post_hook(struct command *cmd)
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{
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struct command *cmd_p;
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int argc;
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const char **argv;
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for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
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if (cmd_p->error_string)
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continue;
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argc++;
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}
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if (!argc || access(update_post_hook, X_OK) < 0)
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return;
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argv = xmalloc(sizeof(*argv) * (2 + argc));
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argv[0] = update_post_hook;
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for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
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char *p;
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if (cmd_p->error_string)
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continue;
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p = xmalloc(strlen(cmd_p->ref_name) + 1);
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strcpy(p, cmd_p->ref_name);
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argv[argc] = p;
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argc++;
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}
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argv[argc] = NULL;
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run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
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| RUN_COMMAND_STDOUT_TO_STDERR);
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}
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static void execute_commands(const char *unpacker_error)
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{
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struct command *cmd = commands;
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if (unpacker_error) {
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while (cmd) {
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cmd->error_string = "n/a (unpacker error)";
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cmd = cmd->next;
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}
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return;
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}
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if (run_hook(pre_receive_hook)) {
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while (cmd) {
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cmd->error_string = "pre-receive hook declined";
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cmd = cmd->next;
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}
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return;
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}
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while (cmd) {
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cmd->error_string = update(cmd);
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cmd = cmd->next;
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}
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}
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static void read_head_info(void)
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{
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struct command **p = &commands;
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for (;;) {
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static char line[1000];
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unsigned char old_sha1[20], new_sha1[20];
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struct command *cmd;
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char *refname;
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int len, reflen;
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len = packet_read_line(0, line, sizeof(line));
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if (!len)
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break;
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if (line[len-1] == '\n')
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line[--len] = 0;
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if (len < 83 ||
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line[40] != ' ' ||
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line[81] != ' ' ||
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get_sha1_hex(line, old_sha1) ||
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get_sha1_hex(line + 41, new_sha1))
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die("protocol error: expected old/new/ref, got '%s'",
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line);
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refname = line + 82;
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reflen = strlen(refname);
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if (reflen + 82 < len) {
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if (strstr(refname + reflen + 1, "report-status"))
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report_status = 1;
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}
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cmd = xmalloc(sizeof(struct command) + len - 80);
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hashcpy(cmd->old_sha1, old_sha1);
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hashcpy(cmd->new_sha1, new_sha1);
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memcpy(cmd->ref_name, line + 82, len - 81);
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cmd->error_string = NULL;
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cmd->next = NULL;
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*p = cmd;
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p = &cmd->next;
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}
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}
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static const char *parse_pack_header(struct pack_header *hdr)
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{
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switch (read_pack_header(0, hdr)) {
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case PH_ERROR_EOF:
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return "eof before pack header was fully read";
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case PH_ERROR_PACK_SIGNATURE:
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return "protocol error (pack signature mismatch detected)";
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case PH_ERROR_PROTOCOL:
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return "protocol error (pack version unsupported)";
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default:
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return "unknown error in parse_pack_header";
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case 0:
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return NULL;
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}
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}
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static const char *pack_lockfile;
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static const char *unpack(void)
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{
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struct pack_header hdr;
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const char *hdr_err;
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char hdr_arg[38];
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hdr_err = parse_pack_header(&hdr);
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if (hdr_err)
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return hdr_err;
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snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
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ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
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if (ntohl(hdr.hdr_entries) < unpack_limit) {
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int code;
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const char *unpacker[3];
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unpacker[0] = "unpack-objects";
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unpacker[1] = hdr_arg;
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unpacker[2] = NULL;
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code = run_command_v_opt(unpacker, RUN_GIT_CMD);
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switch (code) {
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case 0:
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return NULL;
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case -ERR_RUN_COMMAND_FORK:
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return "unpack fork failed";
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case -ERR_RUN_COMMAND_EXEC:
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return "unpack execute failed";
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case -ERR_RUN_COMMAND_WAITPID:
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return "waitpid failed";
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case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
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return "waitpid is confused";
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case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
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return "unpacker died of signal";
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case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
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return "unpacker died strangely";
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default:
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return "unpacker exited with error code";
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}
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} else {
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const char *keeper[6];
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int fd[2], s, len, status;
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pid_t pid;
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char keep_arg[256];
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char packname[46];
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s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
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if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
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strcpy(keep_arg + s, "localhost");
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keeper[0] = "index-pack";
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keeper[1] = "--stdin";
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keeper[2] = "--fix-thin";
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keeper[3] = hdr_arg;
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keeper[4] = keep_arg;
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keeper[5] = NULL;
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if (pipe(fd) < 0)
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return "index-pack pipe failed";
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pid = fork();
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if (pid < 0)
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return "index-pack fork failed";
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if (!pid) {
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dup2(fd[1], 1);
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close(fd[1]);
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close(fd[0]);
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execv_git_cmd(keeper);
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die("execv of index-pack failed");
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}
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close(fd[1]);
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/*
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* The first thing we expects from index-pack's output
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* is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
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* %40s is the newly created pack SHA1 name. In the "keep"
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* case, we need it to remove the corresponding .keep file
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* later on. If we don't get that then tough luck with it.
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*/
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for (len = 0;
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len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
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len += s);
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close(fd[0]);
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if (len == 46 && packname[45] == '\n' &&
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memcmp(packname, "keep\t", 5) == 0) {
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char path[PATH_MAX];
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packname[45] = 0;
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snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
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get_object_directory(), packname + 5);
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pack_lockfile = xstrdup(path);
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}
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/* Then wrap our index-pack process. */
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while (waitpid(pid, &status, 0) < 0)
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if (errno != EINTR)
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return "waitpid failed";
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if (WIFEXITED(status)) {
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int code = WEXITSTATUS(status);
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if (code)
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return "index-pack exited with error code";
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reprepare_packed_git();
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return NULL;
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}
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return "index-pack abnormal exit";
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}
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}
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static void report(const char *unpack_status)
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{
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struct command *cmd;
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packet_write(1, "unpack %s\n",
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unpack_status ? unpack_status : "ok");
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for (cmd = commands; cmd; cmd = cmd->next) {
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if (!cmd->error_string)
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packet_write(1, "ok %s\n",
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cmd->ref_name);
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else
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packet_write(1, "ng %s %s\n",
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cmd->ref_name, cmd->error_string);
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}
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packet_flush(1);
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}
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static int delete_only(struct command *cmd)
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{
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while (cmd) {
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if (!is_null_sha1(cmd->new_sha1))
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return 0;
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cmd = cmd->next;
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}
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return 1;
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}
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int main(int argc, char **argv)
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{
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int i;
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char *dir = NULL;
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argv++;
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for (i = 1; i < argc; i++) {
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char *arg = *argv++;
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if (*arg == '-') {
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/* Do flag handling here */
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usage(receive_pack_usage);
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}
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if (dir)
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usage(receive_pack_usage);
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dir = arg;
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}
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if (!dir)
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usage(receive_pack_usage);
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if (!enter_repo(dir, 0))
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die("'%s': unable to chdir or not a git archive", dir);
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if (is_repository_shallow())
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die("attempt to push into a shallow repository");
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git_config(receive_pack_config);
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if (0 <= transfer_unpack_limit)
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unpack_limit = transfer_unpack_limit;
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else if (0 <= receive_unpack_limit)
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unpack_limit = receive_unpack_limit;
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write_head_info();
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/* EOF */
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|
packet_flush(1);
|
|
|
|
read_head_info();
|
|
if (commands) {
|
|
const char *unpack_status = NULL;
|
|
|
|
if (!delete_only(commands))
|
|
unpack_status = unpack();
|
|
execute_commands(unpack_status);
|
|
if (pack_lockfile)
|
|
unlink(pack_lockfile);
|
|
if (report_status)
|
|
report(unpack_status);
|
|
run_hook(post_receive_hook);
|
|
run_update_post_hook(commands);
|
|
}
|
|
return 0;
|
|
}
|