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tag: v1.6.1.4
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#include "cache.h"
#include "tree.h"

int main(int ac, char **av)
{
unsigned char hash1[20], hash2[20], shifted[20];
struct tree *one, *two;

if (get_sha1(av[1], hash1))
die("cannot parse %s as an object name", av[1]);
if (get_sha1(av[2], hash2))
die("cannot parse %s as an object name", av[2]);
one = parse_tree_indirect(hash1);
if (!one)
die("not a treeish %s", av[1]);
two = parse_tree_indirect(hash2);
if (!two)
die("not a treeish %s", av[2]);

shift_tree(one->object.sha1, two->object.sha1, shifted, -1);
printf("shifted: %s\n", sha1_to_hex(shifted));

exit(0);
}
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