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-Error reporting in git
-======================
-
-`die`, `usage`, `error`, and `warning` report errors of various
-kinds.
-
-- `die` is for fatal application errors.  It prints a message to
-  the user and exits with status 128.
-
-- `usage` is for errors in command line usage.  After printing its
-  message, it exits with status 129.  (See also `usage_with_options`
-  in the link:api-parse-options.html[parse-options API].)
-
-- `error` is for non-fatal library errors.  It prints a message
-  to the user and returns -1 for convenience in signaling the error
-  to the caller.
-
-- `warning` is for reporting situations that probably should not
-  occur but which the user (and Git) can continue to work around
-  without running into too many problems.  Like `error`, it
-  returns -1 after reporting the situation to the caller.
-
-Customizable error handlers
----------------------------
-
-The default behavior of `die` and `error` is to write a message to
-stderr and then exit or return as appropriate.  This behavior can be
-overridden using `set_die_routine` and `set_error_routine`.  For
-example, "git daemon" uses set_die_routine to write the reason `die`
-was called to syslog before exiting.
-
-Library errors
---------------
-
-Functions return a negative integer on error.  Details beyond that
-vary from function to function:
-
-- Some functions return -1 for all errors.  Others return a more
-  specific value depending on how the caller might want to react
-  to the error.
-
-- Some functions report the error to stderr with `error`,
-  while others leave that for the caller to do.
-
-- errno is not meaningful on return from most functions (except
-  for thin wrappers for system calls).
-
-Check the function's API documentation to be sure.
-
-Caller-handled errors
----------------------
-
-An increasing number of functions take a parameter 'struct strbuf *err'.
-On error, such functions append a message about what went wrong to the
-'err' strbuf.  The message is meant to be complete enough to be passed
-to `die` or `error` as-is.  For example:
-
-	if (ref_transaction_commit(transaction, &err))
-		die("%s", err.buf);
-
-The 'err' parameter will be untouched if no error occurred, so multiple
-function calls can be chained:
-
-	t = ref_transaction_begin(&err);
-	if (!t ||
-	    ref_transaction_update(t, "HEAD", ..., &err) ||
-	    ret_transaction_commit(t, &err))
-		die("%s", err.buf);
-
-The 'err' parameter must be a pointer to a valid strbuf.  To silence
-a message, pass a strbuf that is explicitly ignored:
-
-	if (thing_that_can_fail_in_an_ignorable_way(..., &err))
-		/* This failure is okay. */
-		strbuf_reset(&err);