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41dcc4dccc
Many callers of read_in_full() expect to see the exact number of bytes requested, but their error handling lumps together true read errors and short reads due to unexpected EOF. We can give more specific error messages by separating these cases (showing errno when appropriate, and otherwise describing the short read). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
42 lines
1 KiB
C
42 lines
1 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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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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if (!skip_prefix(content, "52 comment=", &comment))
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return 1;
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if (write_in_full(1, comment, 41) < 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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