Commitc509ae4

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backup: sanity check that external directories do not overlap

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Original file line number	Diff line number	Diff line change
`@@ -3494,6 +3494,30 @@ check_external_for_tablespaces(parray *external_list)`
`3494`	`3494`	`}`
`3495`	`3495`	`}`
`3496`	`3496`	`PQclear(res);`
	`3497`	`+`
	`3498`	`+/* Check that external directories do not overlap */`
	`3499`	`+if (parray_num(external_list)<2)`
	`3500`	`+return;`
	`3501`	`+`
	`3502`	`+for (i=0;i<parray_num(external_list);i++)`
	`3503`	`+{`
	`3504`	`+char*external_path=parray_get(external_list,i);`
	`3505`	`+`
	`3506`	`+for (j=0;j<parray_num(external_list);j++)`
	`3507`	`+{`
	`3508`	`+char*tmp_external_path=parray_get(external_list,j);`
	`3509`	`+`
	`3510`	`+/* skip yourself */`
	`3511`	`+if (j==i)`
	`3512`	`+continue;`
	`3513`	`+`
	`3514`	`+if (path_is_prefix_of_path(external_path,tmp_external_path))`
	`3515`	`+elog(ERROR,"External directory path (-E option) \"%s\" "`
	`3516`	`+"contain another external directory \"%s\"",`
	`3517`	`+external_path,tmp_external_path);`
	`3518`	`+`
	`3519`	`+}`
	`3520`	`+}`
`3497`	`3521`	`}`
`3498`	`3522`
`3499`	`3523`	`/* Get index list for given database */`

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