[PATCH v2] t1402: test forbidden characters in refnames

From: Nikolaus Schuetz <nikolauspschuetz@gmail.com>

git-check-ref-format(1) documents that a refname cannot contain a space, tilde, caret, colon, question-mark, asterisk, open-bracket or backslash, nor the sequence "..", and cannot be the single character "@". Of these, only "?", "\" and ".." were tested embedded in an otherwise-valid refname; "*" was checked only as a lone character or with --refspec-pattern.

Test all of them in that embedded form with a single loop, and check that "@" alone is rejected even with --allow-onelevel -- where "@" is otherwise a valid refname component, as "refs/@" confirms.

Signed-off-by: Nikolaus Schuetz <nikolauspschuetz@gmail.com>
---
    t1402: test forbidden characters in refnames
    
    git-check-ref-format(1) documents the characters that a refname may not
    contain (space, tilde, caret, colon, question-mark, asterisk,
    open-bracket) and the rule that it may not be the single character "@".
    t1402 only exercised a few of these directly.
    
    This adds the remaining forbidden characters in embedded form, and
    checks that "@" alone is rejected even with --allow-onelevel, where "@"
    is otherwise a valid refname component (as "refs/@" confirms).
    
    Test-only; documents existing behaviour, in the spirit of 919eb8ace
    (t1402: check for refs ending with a dot).

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-2203%2Fnikolauspschuetz%2Fns%2Ft1402-forbidden-characters-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-2203/nikolauspschuetz/ns/t1402-forbidden-characters-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/2203

Range-diff vs v1:

 1:  f254db5b09 ! 1:  cc013499f9 t1402: test forbidden characters in refnames
     @@ Commit message
          t1402: test forbidden characters in refnames
      
          git-check-ref-format(1) documents that a refname cannot contain a
     -    space, tilde, caret, colon, question-mark, asterisk or open-bracket,
     -    and that it cannot be the single character "@".  Of these, only "?"
     -    was tested as a character embedded in an otherwise-valid refname;
     -    "*" was checked only as a lone character or with --refspec-pattern.
     +    space, tilde, caret, colon, question-mark, asterisk, open-bracket or
     +    backslash, nor the sequence "..", and cannot be the single character
     +    "@".  Of these, only "?", "\" and ".." were tested embedded in an
     +    otherwise-valid refname; "*" was checked only as a lone character or
     +    with --refspec-pattern.
      
     -    Add the remaining forbidden characters in that embedded form, and
     -    check that "@" alone is rejected even with --allow-onelevel -- where
     -    "@" is otherwise a valid refname component, as "refs/@" confirms.
     +    Test all of them in that embedded form with a single loop, and check
     +    that "@" alone is rejected even with --allow-onelevel -- where "@" is
     +    otherwise a valid refname component, as "refs/@" confirms.
      
          Signed-off-by: Nikolaus Schuetz <nikolauspschuetz@gmail.com>
      
       ## t/t1402-check-ref-format.sh ##
     -@@ t/t1402-check-ref-format.sh: invalid_ref '.refs/foo'
     +@@ t/t1402-check-ref-format.sh: invalid_ref 'foo/./bar'
     + invalid_ref 'foo/bar/.'
     + invalid_ref '.refs/foo'
       invalid_ref 'refs/heads/foo.'
     - invalid_ref 'heads/foo..bar'
     - invalid_ref 'heads/foo?bar'
     -+invalid_ref 'heads/foo~bar'
     -+invalid_ref 'heads/foo^bar'
     -+invalid_ref 'heads/foo:bar'
     -+invalid_ref 'heads/foo*bar'
     -+invalid_ref 'heads/foo[bar'
     -+invalid_ref 'heads/foo bar'
     +-invalid_ref 'heads/foo..bar'
     +-invalid_ref 'heads/foo?bar'
     ++for c in '?' '~' '^' ':' '*' '[' ' ' '\' '..'
     ++do
     ++	invalid_ref "heads/foo${c}bar"
     ++done
       valid_ref 'foo./bar'
       invalid_ref 'heads/foo.lock'
       invalid_ref 'heads///foo.lock'
     @@ t/t1402-check-ref-format.sh: invalid_ref '.refs/foo'
      +valid_ref 'refs/@'
      +invalid_ref '@' --allow-onelevel
       invalid_ref 'heads/v@{ation'
     - invalid_ref 'heads/foo\bar'
     +-invalid_ref 'heads/foo\bar'
       invalid_ref "$(printf 'heads/foo\t')"
     + invalid_ref "$(printf 'heads/foo\177')"
     + valid_ref "$(printf 'heads/fu\303\237')"

 t/t1402-check-ref-format.sh | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)