undef/git-commit-vandalism
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Use /dev/null for update hook stdin.

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Currently the update hook invoked by receive-pack has its stdin
connected to the pushing client.  The hook shouldn't attempt to
read from this stream, and doing so may consume data that was
meant for receive-pack.  Instead we should give the update hook
/dev/null as its stdin, ensuring that it always receives EOF and
doesn't disrupt the protocol if it attempts to read any data.

The post-update hook is similar, as it gets invoked with /dev/null
on stdin to prevent the hook from reading data from the client.
Previously we had invoked it with stdout also connected to /dev/null,
throwing away anything on stdout, to prevent client protocol errors.
Instead we should redirect stdout to stderr, like we do with the
update hook.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Shawn O. Pearce 2006-12-30 21:55:22 -05:00 committed by Junio C Hamano
parent cd83c74cb3
commit 95d3c4f546
3 changed files with 8 additions and 6 deletions
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6
receive-pack.c
View File

@ -73,7 +73,8 @@ static int run_update_hook(const char *refname,
if (access(update_hook, X_OK) < 0)
return 0;
code = run_command_opt(RUN_COMMAND_STDOUT_TO_STDERR,
code = run_command_opt(RUN_COMMAND_NO_STDIN
| RUN_COMMAND_STDOUT_TO_STDERR,
update_hook, refname, old_hex, new_hex, NULL);
switch (code) {
case 0:
@ -188,7 +189,8 @@ static void run_update_post_hook(struct command *cmd)
argc++;
}
argv[argc] = NULL;
run_command_v_opt(argv, RUN_COMMAND_NO_STDIO);
run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
| RUN_COMMAND_STDOUT_TO_STDERR);
}
/*

6
run-command.c
View File

@ -9,12 +9,12 @@ int run_command_v_opt(const char **argv, int flags)
if (pid < 0)
return -ERR_RUN_COMMAND_FORK;
if (!pid) {
if (flags & RUN_COMMAND_NO_STDIO) {
if (flags & RUN_COMMAND_NO_STDIN) {
int fd = open("/dev/null", O_RDWR);
dup2(fd, 0);
dup2(fd, 1);
close(fd);
} else if (flags & RUN_COMMAND_STDOUT_TO_STDERR)
}
if (flags & RUN_COMMAND_STDOUT_TO_STDERR)
dup2(2, 1);
if (flags & RUN_GIT_CMD) {
execv_git_cmd(argv);

2
run-command.h
View File

@ -11,7 +11,7 @@ enum {
ERR_RUN_COMMAND_WAITPID_NOEXIT,
};
#define RUN_COMMAND_NO_STDIO 1
#define RUN_COMMAND_NO_STDIN 1
#define RUN_GIT_CMD 2 /*If this is to be git sub-command */
#define RUN_COMMAND_STDOUT_TO_STDERR 4
int run_command_v_opt(const char **argv, int opt);