
Fix #20456 At some point during the 1.17 cycle abbreviated refs to issue branches started breaking. This is likely due serious inconsistencies in our management of refs throughout Gitea - which is a bug needing to be addressed in a different PR. (Likely more than one) We should try to use non-abbreviated refs as much as possible. That is where a user has inputted a abbreviated ref we should add refs/heads/ if it is branch etc. I know people keep writing and merging PRs that remove prefixes from stored content but it is just wrong and it keeps causing problems like this. We should only remove the prefix at the time of presentation as the prefix is the only way of knowing umambiguously and permanently if the ref is referring to a branch, tag or commit. We need to make it so that every ref has the appropriate prefix, and probably also need to come up with some definitely unambiguous way of storing SHAs if they're used in a ref field. We must not store potentially ambiguous refs. (Especially tagnames - there is no reason why users cannot create a branch with the same short name as a tag and vice versa and any attempt to prevent this will fail. You can even create a branch and a tag that matches a SHA1 pattern.) To that end in order to fix this bug, when parsing issue templates check the provided Ref, if it does not start with refs/ add the BranchPrefix to it. This allows people to make their templates refer to a tag. Next we need to handle the issue links that are already written. The links here are created with `git.RefURL` Here we see there is a bug introduced in #17551 whereby the provided Ref can be double-escaped so we remove the incorrect external escape. (The escape added in #17551 is in the right place - unfortunately it missed that the calling function was doing the wrong thing.) Then within RefURL we check if the unprefixed ref could actually be a SHA before defaulting that an unprefixed ref is actually a commit - if not it is assumed to be a branch. This will handle most of the problem cases excepting the very unusual cases where someone has deliberately written a branch to look like a SHA1. But please if something is called a `ref` or interpreted as a `ref` make it a full-ref before storing or using it. By all means if something is a `branch` assume the prefix is removed but always add it back in if you are using it as a `ref`. Stop storing abbreviated branch names and tag names as refs. It will keep on causing problems like this. Fix #20456 Signed-off-by: Andrew Thornton <art27@cantab.net>
175 lines
4.1 KiB
Go
175 lines
4.1 KiB
Go
// Copyright 2015 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package git
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import (
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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"sync"
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"code.gitea.io/gitea/modules/util"
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)
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// ObjectCache provides thread-safe cache operations.
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type ObjectCache struct {
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lock sync.RWMutex
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cache map[string]interface{}
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}
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func newObjectCache() *ObjectCache {
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return &ObjectCache{
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cache: make(map[string]interface{}, 10),
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}
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}
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// Set add obj to cache
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func (oc *ObjectCache) Set(id string, obj interface{}) {
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oc.lock.Lock()
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defer oc.lock.Unlock()
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oc.cache[id] = obj
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}
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// Get get cached obj by id
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func (oc *ObjectCache) Get(id string) (interface{}, bool) {
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oc.lock.RLock()
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defer oc.lock.RUnlock()
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obj, has := oc.cache[id]
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return obj, has
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}
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// isDir returns true if given path is a directory,
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// or returns false when it's a file or does not exist.
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func isDir(dir string) bool {
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f, e := os.Stat(dir)
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if e != nil {
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return false
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}
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return f.IsDir()
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}
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// isFile returns true if given path is a file,
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// or returns false when it's a directory or does not exist.
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func isFile(filePath string) bool {
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f, e := os.Stat(filePath)
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if e != nil {
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return false
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}
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return !f.IsDir()
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}
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// isExist checks whether a file or directory exists.
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// It returns false when the file or directory does not exist.
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func isExist(path string) bool {
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_, err := os.Stat(path)
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return err == nil || os.IsExist(err)
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}
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// ConcatenateError concatenats an error with stderr string
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func ConcatenateError(err error, stderr string) error {
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if len(stderr) == 0 {
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return err
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}
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return fmt.Errorf("%w - %s", err, stderr)
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}
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// RefEndName return the end name of a ref name
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func RefEndName(refStr string) string {
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if strings.HasPrefix(refStr, BranchPrefix) {
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return refStr[len(BranchPrefix):]
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}
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if strings.HasPrefix(refStr, TagPrefix) {
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return refStr[len(TagPrefix):]
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}
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return refStr
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}
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// RefURL returns the absolute URL for a ref in a repository
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func RefURL(repoURL, ref string) string {
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refName := util.PathEscapeSegments(RefEndName(ref))
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switch {
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case strings.HasPrefix(ref, BranchPrefix):
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return repoURL + "/src/branch/" + refName
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case strings.HasPrefix(ref, TagPrefix):
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return repoURL + "/src/tag/" + refName
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case !SHAPattern.MatchString(ref):
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// assume they mean a branch
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return repoURL + "/src/branch/" + refName
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default:
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return repoURL + "/src/commit/" + refName
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}
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}
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// SplitRefName splits a full refname to reftype and simple refname
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func SplitRefName(refStr string) (string, string) {
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if strings.HasPrefix(refStr, BranchPrefix) {
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return BranchPrefix, refStr[len(BranchPrefix):]
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}
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if strings.HasPrefix(refStr, TagPrefix) {
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return TagPrefix, refStr[len(TagPrefix):]
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}
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return "", refStr
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}
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// ParseBool returns the boolean value represented by the string as per git's git_config_bool
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// true will be returned for the result if the string is empty, but valid will be false.
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// "true", "yes", "on" are all true, true
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// "false", "no", "off" are all false, true
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// 0 is false, true
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// Any other integer is true, true
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// Anything else will return false, false
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func ParseBool(value string) (result, valid bool) {
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// Empty strings are true but invalid
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if len(value) == 0 {
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return true, false
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}
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// These are the git expected true and false values
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if strings.EqualFold(value, "true") || strings.EqualFold(value, "yes") || strings.EqualFold(value, "on") {
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return true, true
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}
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if strings.EqualFold(value, "false") || strings.EqualFold(value, "no") || strings.EqualFold(value, "off") {
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return false, true
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}
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// Try a number
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intValue, err := strconv.ParseInt(value, 10, 32)
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if err != nil {
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return false, false
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}
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return intValue != 0, true
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}
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// LimitedReaderCloser is a limited reader closer
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type LimitedReaderCloser struct {
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R io.Reader
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C io.Closer
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N int64
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}
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// Read implements io.Reader
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func (l *LimitedReaderCloser) Read(p []byte) (n int, err error) {
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if l.N <= 0 {
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_ = l.C.Close()
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return 0, io.EOF
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}
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if int64(len(p)) > l.N {
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p = p[0:l.N]
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}
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n, err = l.R.Read(p)
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l.N -= int64(n)
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return n, err
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}
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// Close implements io.Closer
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func (l *LimitedReaderCloser) Close() error {
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return l.C.Close()
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}
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