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678eb55f5d
In a future commit, we're going to work with some large files which will be at least 4 GiB in size. To take advantage of the sparseness functionality on most Unix systems and avoid running the system out of disk, it would be convenient to use truncate(2) to simply create a sparse file of sufficient size. However, the GNU truncate(1) utility isn't portable, so let's write a tiny test helper that does the work for us. Signed-off-by: brian m. carlson <bk2204@github.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
26 lines
456 B
C
26 lines
456 B
C
#include "test-tool.h"
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#include "git-compat-util.h"
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/*
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* Truncate a file to the given size.
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*/
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int cmd__truncate(int argc, const char **argv)
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{
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char *p = NULL;
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uintmax_t sz = 0;
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int fd = -1;
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if (argc != 3)
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die("expected filename and size");
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sz = strtoumax(argv[2], &p, 0);
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if (*p)
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die("invalid size");
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fd = xopen(argv[1], O_WRONLY | O_CREAT, 0600);
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if (ftruncate(fd, (off_t) sz) < 0)
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die_errno("failed to truncate file");
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return 0;
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}
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