git

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#include "builtin.h"
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#include "transport.h"
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static const char usage_msg[] =
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	"git remote-fd <remote> <url>";
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/*
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 * URL syntax:
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 *	'fd::<inoutfd>[/<anything>]'		Read/write socket pair
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 *						<inoutfd>.
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 *	'fd::<infd>,<outfd>[/<anything>]'	Read pipe <infd> and write
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 *						pipe <outfd>.
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 *	[foo] indicates 'foo' is optional. <anything> is any string.
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 *
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 * The data output to <outfd>/<inoutfd> should be passed unmolested to
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 * git-receive-pack/git-upload-pack/git-upload-archive and output of
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 * git-receive-pack/git-upload-pack/git-upload-archive should be passed
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 * unmolested to <infd>/<inoutfd>.
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 *
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 */
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#define MAXCOMMAND 4096
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static void command_loop(int input_fd, int output_fd)
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{
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	char buffer[MAXCOMMAND];
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	while (1) {
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		size_t i;
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		if (!fgets(buffer, MAXCOMMAND - 1, stdin)) {
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			if (ferror(stdin))
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				die("Input error");
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			return;
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		}
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		/* Strip end of line characters. */
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		i = strlen(buffer);
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		while (i > 0 && isspace(buffer[i - 1]))
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			buffer[--i] = 0;
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		if (!strcmp(buffer, "capabilities")) {
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			printf("*connect\n\n");
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			fflush(stdout);
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		} else if (starts_with(buffer, "connect ")) {
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			printf("\n");
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			fflush(stdout);
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			if (bidirectional_transfer_loop(input_fd,
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				output_fd))
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				die("Copying data between file descriptors failed");
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			return;
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		} else {
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			die("Bad command: %s", buffer);
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		}
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	}
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}
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int cmd_remote_fd(int argc, const char **argv, const char *prefix)
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{
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	int input_fd = -1;
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	int output_fd = -1;
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	char *end;
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	BUG_ON_NON_EMPTY_PREFIX(prefix);
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	if (argc != 3)
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		usage(usage_msg);
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	input_fd = (int)strtoul(argv[2], &end, 10);
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	if ((end == argv[2]) || (*end != ',' && *end != '/' && *end))
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		die("Bad URL syntax");
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	if (*end == '/' || !*end) {
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		output_fd = input_fd;
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	} else {
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		char *end2;
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		output_fd = (int)strtoul(end + 1, &end2, 10);
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		if ((end2 == end + 1) || (*end2 != '/' && *end2))
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			die("Bad URL syntax");
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	}
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	command_loop(input_fd, output_fd);
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	return 0;
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}
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