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Make every not exist error unwrappable to a fs.ErrNotExist (#20891)

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A lot of our code is repeatedly testing if individual errors are
specific types of Not Exist errors. This is repetitative and unnecesary.
`Unwrap() error` provides a common way of labelling an error as a
NotExist error and we can/should use this.

This PR has chosen to use the common `io/fs` errors e.g.
`fs.ErrNotExist` for our errors. This is in some ways not completely
correct as these are not filesystem errors but it seems like a
reasonable thing to do and would allow us to simplify a lot of our code
to `errors.Is(err, fs.ErrNotExist)` instead of
`package.IsErr...NotExist(err)`

I am open to suggestions to use a different base error - perhaps
`models/db.ErrNotExist` if that would be felt to be better.


Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: delvh <dev.lh@web.de>
This commit is contained in:
zeripath 2022-10-18 06:50:37 +01:00 • committed by GitHub
parent 6af1a0c8c0
commit 716fcfcf72
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48 changed files with 545 additions and 20 deletions
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10
models/foreignreference/error.go
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@ -6,6 +6,8 @@ package foreignreference
import (
"fmt"
"code.gitea.io/gitea/modules/util"
)
// ErrLocalIndexNotExist represents a "LocalIndexNotExist" kind of error.
@ -25,6 +27,10 @@ func (err ErrLocalIndexNotExist) Error() string {
return fmt.Sprintf("repository %d has no LocalIndex for ForeignIndex %d of type %s", err.RepoID, err.ForeignIndex, err.Type)
}
func (err ErrLocalIndexNotExist) Unwrap() error {
return util.ErrNotExist
}
// ErrForeignIndexNotExist represents a "ForeignIndexNotExist" kind of error.
type ErrForeignIndexNotExist struct {
RepoID int64
@ -41,3 +47,7 @@ func IsErrForeignIndexNotExist(err error) bool {
func (err ErrForeignIndexNotExist) Error() string {
return fmt.Sprintf("repository %d has no ForeignIndex for LocalIndex %d of type %s", err.RepoID, err.LocalIndex, err.Type)
}
func (err ErrForeignIndexNotExist) Unwrap() error {
return util.ErrNotExist
}