follow-up: can't get any fsck msgid to fire for tags

follow-up: can't get any fsck msgid to fire for tags

[Xavier Morel]

Following the previous investigation of commits I figured I'd look at
tags, and I'm wondering if I'm doing something wrong because going
down the list I attempted to trigger 5 fsck diagnostics and got 0 to
work.

My process is simple: create a loose object with an error in it e.g.

    object 00
    type blob
    name bad
    tagger a <a> 0 +0000

    msg

which has an invalid sha1 reference for the object and thus seems like
it would trigger badObjectSha1[0].

Then run fsck on that object, enabling the msgid if it defaults to
IGNORE or INFO, and look at the result.

- badObjectSha1: error in git show (fatal: bad object), fsck says
  "object could not be parsed" and "object missing"
- badTagName: the diag doesn't trigger at all
- badType: does error with "unknown tag type" (followed by "could not
  be parsed" and "object missing") but the msgid is never listed so I
  don't think this is from fsck
- extraHeaderEntry: "object could not be parsed" and "object missing"
  (also "bad object" from "git show", despite extraHeaderEntry being
  ignore by default so that's quite strange)
- missingObject: "object could not be parsed" and "object missing"

I'm really confused at this point.

Note: creating a ref for the annotated tag and fsck-ing the entire
repository sometimes generates different but not materially
better errors.

[0] https://git-scm.com/docs/git-fsck#Documentation/git-fsck.txt-codebadObjectSha1code