53 lines
		
	
	
		
			1.3 KiB
		
	
	
	
		
			C
		
	
	
			
		
		
	
	
			53 lines
		
	
	
		
			1.3 KiB
		
	
	
	
		
			C
		
	
	
/*
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 * Copyright (c) 2005, 2006 Rene Scharfe
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 */
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#include "cache.h"
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#include "commit.h"
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#include "tar.h"
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#include "builtin.h"
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#include "quote.h"
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static const char builtin_get_tar_commit_id_usage[] =
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"git get-tar-commit-id";
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/* ustar header + extended global header content */
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#define RECORDSIZE	(512)
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#define HEADERSIZE (2 * RECORDSIZE)
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int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix)
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{
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	char buffer[HEADERSIZE];
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	struct ustar_header *header = (struct ustar_header *)buffer;
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	char *content = buffer + RECORDSIZE;
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	const char *comment;
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	ssize_t n;
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	long len;
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	char *end;
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	if (argc != 1)
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		usage(builtin_get_tar_commit_id_usage);
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	n = read_in_full(0, buffer, HEADERSIZE);
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	if (n < 0)
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		die_errno("git get-tar-commit-id: read error");
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	if (n != HEADERSIZE)
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		die_errno("git get-tar-commit-id: EOF before reading tar header");
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	if (header->typeflag[0] != 'g')
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		return 1;
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	len = strtol(content, &end, 10);
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	if (errno == ERANGE || end == content || len < 0)
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		return 1;
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	if (!skip_prefix(end, " comment=", &comment))
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		return 1;
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	len -= comment - content;
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	if (len < 1 || !(len % 2) ||
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	    hash_algo_by_length((len - 1) / 2) == GIT_HASH_UNKNOWN)
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		return 1;
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	if (write_in_full(1, comment, len) < 0)
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		die_errno("git get-tar-commit-id: write error");
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	return 0;
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}
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