versionfmt: init rpm versionfmt
This commit is contained in:
parent
033709eaea
commit
6864a8efea
@ -16,6 +16,8 @@ package rpm
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import (
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"errors"
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"math"
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"regexp"
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"strconv"
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"strings"
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"unicode"
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@ -23,26 +25,25 @@ import (
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"github.com/coreos/clair/ext/versionfmt"
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)
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var (
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// alphanumPattern is a regular expression to match all sequences of numeric
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// characters or alphanumeric characters.
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alphanumPattern = regexp.MustCompile("([a-zA-Z]+)|([0-9]+)|(~)")
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allowedSymbols = []rune{'.', '-', '+', '~', ':', '_'}
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)
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type version struct {
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epoch int
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version string
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revision string
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epoch int
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version string
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release string
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}
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var (
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minVersion = version{version: versionfmt.MinVersion}
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maxVersion = version{version: versionfmt.MaxVersion}
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versionAllowedSymbols = []rune{'.', '-', '+', '~', ':', '_'}
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revisionAllowedSymbols = []rune{'.', '+', '~', '_'}
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)
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// newVersion function parses a string into a Version struct which can be compared
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//
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// The implementation is based on http://man.he.net/man5/deb-version
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// on https://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Version
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//
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// It uses the dpkg-1.17.25's algorithm (lib/parsehelp.c)
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// newVersion parses a string into a version type which can be compared.
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func newVersion(str string) (version, error) {
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var v version
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@ -77,34 +78,30 @@ func newVersion(str string) (version, error) {
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v.epoch = 0
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}
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// Find version / revision
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seprevision := strings.LastIndex(str, "-")
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// Find version / release
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seprevision := strings.Index(str, "-")
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if seprevision > -1 {
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v.version = str[sepepoch+1 : seprevision]
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v.revision = str[seprevision+1:]
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v.release = str[seprevision+1:]
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} else {
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v.version = str[sepepoch+1:]
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v.revision = ""
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v.release = ""
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}
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// Verify format
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if len(v.version) == 0 {
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return version{}, errors.New("No version")
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}
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if !unicode.IsDigit(rune(v.version[0])) {
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return version{}, errors.New("version does not start with digit")
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}
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for i := 0; i < len(v.version); i = i + 1 {
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r := rune(v.version[i])
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if !unicode.IsDigit(r) && !unicode.IsLetter(r) && !containsRune(versionAllowedSymbols, r) {
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if !unicode.IsDigit(r) && !unicode.IsLetter(r) && !validSymbol(r) {
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return version{}, errors.New("invalid character in version")
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}
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}
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for i := 0; i < len(v.revision); i = i + 1 {
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r := rune(v.revision[i])
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if !unicode.IsDigit(r) && !unicode.IsLetter(r) && !containsRune(revisionAllowedSymbols, r) {
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for i := 0; i < len(v.release); i = i + 1 {
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r := rune(v.release[i])
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if !unicode.IsDigit(r) && !unicode.IsLetter(r) && !validSymbol(r) {
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return version{}, errors.New("invalid character in revision")
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}
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}
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@ -112,13 +109,6 @@ func newVersion(str string) (version, error) {
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return v, nil
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}
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// newVersionUnsafe is just a wrapper around NewVersion that ignore potentiel
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// parsing error. Useful for test purposes
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func newVersionUnsafe(str string) version {
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v, _ := newVersion(str)
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return v
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}
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type parser struct{}
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func (p parser) Valid(str string) bool {
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@ -126,12 +116,6 @@ func (p parser) Valid(str string) bool {
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return err == nil
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}
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// Compare function compares two Debian-like package version
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//
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// The implementation is based on http://man.he.net/man5/deb-version
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// on https://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Version
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//
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// It uses the dpkg-1.17.25's algorithm (lib/version.c)
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func (p parser) Compare(a, b string) (int, error) {
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v1, err := newVersion(a)
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if err != nil {
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@ -165,13 +149,102 @@ func (p parser) Compare(a, b string) (int, error) {
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}
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// Compare version
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rc := verrevcmp(v1.version, v2.version)
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rc := rpmvercmp(v1.version, v2.version)
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if rc != 0 {
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return signum(rc), nil
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return rc, nil
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}
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// Compare revision
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return signum(verrevcmp(v1.revision, v2.revision)), nil
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return rpmvercmp(v1.release, v2.release), nil
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}
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// rpmcmpver compares two version or release strings.
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//
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// Lifted from github.com/cavaliercoder/go-rpm.
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// For the original C implementation, see:
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// https://github.com/rpm-software-management/rpm/blob/master/lib/rpmvercmp.c#L16
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func rpmvercmp(strA, strB string) int {
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// shortcut for equality
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if strA == strB {
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return 0
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}
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// get alpha/numeric segements
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segsa := alphanumPattern.FindAllString(strA, -1)
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segsb := alphanumPattern.FindAllString(strB, -1)
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segs := int(math.Min(float64(len(segsa)), float64(len(segsb))))
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// compare each segment
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for i := 0; i < segs; i++ {
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a := segsa[i]
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b := segsb[i]
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// compare tildes
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if []rune(a)[0] == '~' && []rune(b)[0] == '~' {
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continue
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}
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if []rune(a)[0] == '~' && []rune(b)[0] != '~' {
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return -1
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}
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if []rune(a)[0] != '~' && []rune(b)[0] == '~' {
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return 1
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}
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if unicode.IsNumber([]rune(a)[0]) {
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// numbers are always greater than alphas
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if !unicode.IsNumber([]rune(b)[0]) {
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// a is numeric, b is alpha
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return 1
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}
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// trim leading zeros
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a = strings.TrimLeft(a, "0")
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b = strings.TrimLeft(b, "0")
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// longest string wins without further comparison
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if len(a) > len(b) {
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return 1
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} else if len(b) > len(a) {
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return -1
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}
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} else if unicode.IsNumber([]rune(b)[0]) {
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// a is alpha, b is numeric
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return -1
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}
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// This is the last iteration.
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if i == segs-1 {
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// If there is a tilde in a segment past the min number of segments, find
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// it before we rely on string compare.
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lia := strings.LastIndex(strA, "~")
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lib := strings.LastIndex(strB, "~")
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if lia > lib {
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return -1
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} else if lia < lib {
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return 1
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}
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}
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// string compare
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if a < b {
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return -1
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} else if a > b {
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return 1
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}
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}
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// segments were all the same but separators must have been different
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if len(segsa) == len(segsb) {
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return 0
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}
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// whoever has the most segments wins
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if len(segsa) > len(segsb) {
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return 1
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}
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return -1
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}
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// String returns the string representation of a Version.
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@ -180,88 +253,14 @@ func (v version) String() (s string) {
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s = strconv.Itoa(v.epoch) + ":"
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}
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s += v.version
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if v.revision != "" {
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s += "-" + v.revision
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if v.release != "" {
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s += "-" + v.release
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}
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return
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}
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func verrevcmp(t1, t2 string) int {
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t1, rt1 := nextRune(t1)
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t2, rt2 := nextRune(t2)
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for rt1 != nil || rt2 != nil {
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firstDiff := 0
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for (rt1 != nil && !unicode.IsDigit(*rt1)) || (rt2 != nil && !unicode.IsDigit(*rt2)) {
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ac := 0
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bc := 0
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if rt1 != nil {
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ac = order(*rt1)
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}
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if rt2 != nil {
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bc = order(*rt2)
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}
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if ac != bc {
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return ac - bc
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}
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t1, rt1 = nextRune(t1)
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t2, rt2 = nextRune(t2)
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}
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for rt1 != nil && *rt1 == '0' {
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t1, rt1 = nextRune(t1)
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}
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for rt2 != nil && *rt2 == '0' {
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t2, rt2 = nextRune(t2)
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}
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for rt1 != nil && unicode.IsDigit(*rt1) && rt2 != nil && unicode.IsDigit(*rt2) {
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if firstDiff == 0 {
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firstDiff = int(*rt1) - int(*rt2)
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}
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t1, rt1 = nextRune(t1)
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t2, rt2 = nextRune(t2)
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}
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if rt1 != nil && unicode.IsDigit(*rt1) {
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return 1
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}
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if rt2 != nil && unicode.IsDigit(*rt2) {
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return -1
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}
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if firstDiff != 0 {
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return firstDiff
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}
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}
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return 0
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}
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// order compares runes using a modified ASCII table
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// so that letters are sorted earlier than non-letters
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// and so that tildes sorts before anything
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func order(r rune) int {
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if unicode.IsDigit(r) {
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return 0
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}
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if unicode.IsLetter(r) {
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return int(r)
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}
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if r == '~' {
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return -1
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}
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return int(r) + 256
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}
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func nextRune(str string) (string, *rune) {
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if len(str) >= 1 {
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r := rune(str[0])
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return str[1:], &r
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}
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return str, nil
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func validSymbol(r rune) bool {
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return containsRune(allowedSymbols, r)
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}
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func containsRune(s []rune, e rune) bool {
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@ -273,17 +272,6 @@ func containsRune(s []rune, e rune) bool {
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return false
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}
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func signum(a int) int {
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switch {
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case a < 0:
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return -1
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case a > 0:
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return +1
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}
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return 0
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}
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func init() {
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versionfmt.RegisterParser("rpm", parser{})
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}
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@ -15,7 +15,6 @@
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package rpm
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import (
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"strings"
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"testing"
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"github.com/stretchr/testify/assert"
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@ -34,31 +33,27 @@ func TestParse(t *testing.T) {
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err bool
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}{
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// Test 0
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{"0", version{epoch: 0, version: "0", revision: ""}, false},
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{"0:0", version{epoch: 0, version: "0", revision: ""}, false},
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{"0:0-", version{epoch: 0, version: "0", revision: ""}, false},
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{"0:0-0", version{epoch: 0, version: "0", revision: "0"}, false},
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{"0:0.0-0.0", version{epoch: 0, version: "0.0", revision: "0.0"}, false},
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{"0", version{epoch: 0, version: "0", release: ""}, false},
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{"0:0", version{epoch: 0, version: "0", release: ""}, false},
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{"0:0-", version{epoch: 0, version: "0", release: ""}, false},
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{"0:0-0", version{epoch: 0, version: "0", release: "0"}, false},
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{"0:0.0-0.0", version{epoch: 0, version: "0.0", release: "0.0"}, false},
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// Test epoched
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{"1:0", version{epoch: 1, version: "0", revision: ""}, false},
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{"5:1", version{epoch: 5, version: "1", revision: ""}, false},
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{"1:0", version{epoch: 1, version: "0", release: ""}, false},
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{"5:1", version{epoch: 5, version: "1", release: ""}, false},
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// Test multiple hypens
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{"0:0-0-0", version{epoch: 0, version: "0-0", revision: "0"}, false},
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{"0:0-0-0-0", version{epoch: 0, version: "0-0-0", revision: "0"}, false},
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{"0:0-0-0", version{epoch: 0, version: "0", release: "0-0"}, false},
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{"0:0-0-0-0", version{epoch: 0, version: "0", release: "0-0-0"}, false},
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// Test multiple colons
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{"0:0:0-0", version{epoch: 0, version: "0:0", revision: "0"}, false},
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{"0:0:0:0-0", version{epoch: 0, version: "0:0:0", revision: "0"}, false},
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{"0:0:0-0", version{epoch: 0, version: "0:0", release: "0"}, false},
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{"0:0:0:0-0", version{epoch: 0, version: "0:0:0", release: "0"}, false},
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// Test multiple hyphens and colons
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{"0:0:0-0-0", version{epoch: 0, version: "0:0-0", revision: "0"}, false},
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{"0:0-0:0-0", version{epoch: 0, version: "0-0:0", revision: "0"}, false},
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// Test valid characters in version
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{"0:09azAZ.-+~:_-0", version{epoch: 0, version: "09azAZ.-+~:_", revision: "0"}, false},
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// Test valid characters in debian revision
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{"0:0-azAZ09.+~_", version{epoch: 0, version: "0", revision: "azAZ09.+~_"}, false},
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{"0:0:0-0-0", version{epoch: 0, version: "0:0", release: "0-0"}, false},
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{"0:0-0:0-0", version{epoch: 0, version: "0", release: "0:0-0"}, false},
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// Test version with leading and trailing spaces
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{" 0:0-1", version{epoch: 0, version: "0", revision: "1"}, false},
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{"0:0-1 ", version{epoch: 0, version: "0", revision: "1"}, false},
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{" 0:0-1 ", version{epoch: 0, version: "0", revision: "1"}, false},
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{" 0:0-1", version{epoch: 0, version: "0", release: "1"}, false},
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{"0:0-1 ", version{epoch: 0, version: "0", release: "1"}, false},
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{" 0:0-1 ", version{epoch: 0, version: "0", release: "1"}, false},
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// Test empty version
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{"", version{}, true},
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{" ", version{}, true},
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@ -71,7 +66,7 @@ func TestParse(t *testing.T) {
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{"a:0-0", version{}, true},
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{"A:0-0", version{}, true},
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// Test version not starting with a digit
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{"0:abc3-0", version{}, true},
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{"0:abc3-0", version{epoch: 0, version: "abc3", release: "0"}, false},
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}
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for _, c := range cases {
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v, err := newVersion(c.str)
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@ -83,20 +78,6 @@ func TestParse(t *testing.T) {
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}
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assert.Equal(t, c.ver, v, "When parsing '%s'", c.str)
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}
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// Test invalid characters in version
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versym := []rune{'!', '#', '@', '$', '%', '&', '/', '|', '\\', '<', '>', '(', ')', '[', ']', '{', '}', ';', ',', '=', '*', '^', '\''}
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for _, r := range versym {
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_, err := newVersion(strings.Join([]string{"0:0", string(r), "-0"}, ""))
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assert.Error(t, err, "Parsing with invalid character '%s' in version should have failed", string(r))
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}
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// Test invalid characters in revision
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versym = []rune{'!', '#', '@', '$', '%', '&', '/', '|', '\\', '<', '>', '(', ')', '[', ']', '{', '}', ':', ';', ',', '=', '*', '^', '\''}
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for _, r := range versym {
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_, err := newVersion(strings.Join([]string{"0:0-", string(r)}, ""))
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assert.Error(t, err, "Parsing with invalid character '%s' in revision should have failed", string(r))
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}
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}
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func TestParseAndCompare(t *testing.T) {
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@ -105,79 +86,117 @@ func TestParseAndCompare(t *testing.T) {
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expected int
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v2 string
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}{
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{"7.6p2-4", GREATER, "7.6-0"},
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{"1.0.3-3", GREATER, "1.0-1"},
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{"1.3", GREATER, "1.2.2-2"},
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{"1.3", GREATER, "1.2.2"},
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// Some properties of text strings
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{"0-pre", EQUAL, "0-pre"},
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{"0-pre", LESS, "0-pree"},
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{"1.1.6r2-2", GREATER, "1.1.6r-1"},
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{"2.6b2-1", GREATER, "2.6b-2"},
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{"98.1p5-1", LESS, "98.1-pre2-b6-2"},
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{"0.4a6-2", GREATER, "0.4-1"},
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{"1:3.0.5-2", LESS, "1:3.0.5.1"},
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// epochs
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{"1:0.4", GREATER, "10.3"},
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{"1:1.25-4", LESS, "1:1.25-8"},
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{"0:1.18.36", EQUAL, "1.18.36"},
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{"1.18.36", GREATER, "1.18.35"},
|
||||
{"0:1.18.36", GREATER, "1.18.35"},
|
||||
// Funky, but allowed, characters in upstream version
|
||||
{"9:1.18.36:5.4-20", LESS, "10:0.5.1-22"},
|
||||
{"9:1.18.36:5.4-20", LESS, "9:1.18.36:5.5-1"},
|
||||
{"9:1.18.36:5.4-20", LESS, " 9:1.18.37:4.3-22"},
|
||||
{"1.18.36-0.17.35-18", GREATER, "1.18.36-19"},
|
||||
// Junk
|
||||
{"1:1.2.13-3", LESS, "1:1.2.13-3.1"},
|
||||
{"2.0.7pre1-4", LESS, "2.0.7r-1"},
|
||||
// if a version includes a dash, it should be the debrev dash - policy says so
|
||||
{"0:0-0-0", GREATER, "0-0"},
|
||||
// do we like strange versions? Yes we like strange versions…
|
||||
{"0", EQUAL, "0"},
|
||||
{"0", EQUAL, "00"},
|
||||
// #205960
|
||||
{"3.0~rc1-1", LESS, "3.0-1"},
|
||||
// #573592 - debian policy 5.6.12
|
||||
{"1.0", EQUAL, "1.0-0"},
|
||||
{"0.2", LESS, "1.0-0"},
|
||||
{"1.0", LESS, "1.0-0+b1"},
|
||||
{"1.0", GREATER, "1.0-0~"},
|
||||
// "steal" the testcases from (old perl) cupt
|
||||
{"1.2.3", EQUAL, "1.2.3"}, // identical
|
||||
{"4.4.3-2", EQUAL, "4.4.3-2"}, // identical
|
||||
{"1:2ab:5", EQUAL, "1:2ab:5"}, // this is correct...
|
||||
{"7:1-a:b-5", EQUAL, "7:1-a:b-5"}, // and this
|
||||
{"57:1.2.3abYZ+~-4-5", EQUAL, "57:1.2.3abYZ+~-4-5"}, // and those too
|
||||
{"1.2.3", EQUAL, "0:1.2.3"}, // zero epoch
|
||||
{"1.2.3", EQUAL, "1.2.3-0"}, // zero revision
|
||||
{"009", EQUAL, "9"}, // zeroes…
|
||||
{"009ab5", EQUAL, "9ab5"}, // there as well
|
||||
{"1.2.3", LESS, "1.2.3-1"}, // added non-zero revision
|
||||
{"1.2.3", LESS, "1.2.4"}, // just bigger
|
||||
{"1.2.4", GREATER, "1.2.3"}, // order doesn't matter
|
||||
{"1.2.24", GREATER, "1.2.3"}, // bigger, eh?
|
||||
{"0.10.0", GREATER, "0.8.7"}, // bigger, eh?
|
||||
{"3.2", GREATER, "2.3"}, // major number rocks
|
||||
{"1.3.2a", GREATER, "1.3.2"}, // letters rock
|
||||
{"0.5.0~git", LESS, "0.5.0~git2"}, // numbers rock
|
||||
{"2a", LESS, "21"}, // but not in all places
|
||||
{"1.3.2a", LESS, "1.3.2b"}, // but there is another letter
|
||||
{"1:1.2.3", GREATER, "1.2.4"}, // epoch rocks
|
||||
{"1:1.2.3", LESS, "1:1.2.4"}, // bigger anyway
|
||||
{"1.2a+~bCd3", LESS, "1.2a++"}, // tilde doesn't rock
|
||||
{"1.2a+~bCd3", GREATER, "1.2a+~"}, // but first is longer!
|
||||
{"5:2", GREATER, "304-2"}, // epoch rocks
|
||||
{"5:2", LESS, "304:2"}, // so big epoch?
|
||||
{"25:2", GREATER, "3:2"}, // 25 > 3, obviously
|
||||
{"1:2:123", LESS, "1:12:3"}, // 12 > 2
|
||||
{"1.2-5", LESS, "1.2-3-5"}, // 1.2 < 1.2-3
|
||||
{"5.10.0", GREATER, "5.005"}, // preceding zeroes don't matters
|
||||
{"3a9.8", LESS, "3.10.2"}, // letters are before all letter symbols
|
||||
{"3a9.8", GREATER, "3~10"}, // but after the tilde
|
||||
{"1.4+OOo3.0.0~", LESS, "1.4+OOo3.0.0-4"}, // another tilde check
|
||||
{"2.4.7-1", LESS, "2.4.7-z"}, // revision comparing
|
||||
{"1.002-1+b2", GREATER, "1.00"}, // whatever...
|
||||
// Tests imported from tests/rpmvercmp.at
|
||||
{"1.0", EQUAL, "1.0"},
|
||||
{"1.0", LESS, "2.0"},
|
||||
{"2.0", GREATER, "1.0"},
|
||||
|
||||
{"2.0.1", EQUAL, "2.0.1"},
|
||||
{"2.0", LESS, "2.0.1"},
|
||||
{"2.0.1", GREATER, "2.0"},
|
||||
|
||||
{"2.0.1a", EQUAL, "2.0.1a"},
|
||||
{"2.0.1a", GREATER, "2.0.1"},
|
||||
{"2.0.1", LESS, "2.0.1a"},
|
||||
|
||||
{"5.5p1", EQUAL, "5.5p1"},
|
||||
{"5.5p1", LESS, "5.5p2"},
|
||||
{"5.5p2", GREATER, "5.5p1"},
|
||||
|
||||
{"5.5p10", EQUAL, "5.5p10"},
|
||||
{"5.5p1", LESS, "5.5p10"},
|
||||
{"5.5p10", GREATER, "5.5p1"},
|
||||
|
||||
{"10xyz", LESS, "10.1xyz"},
|
||||
{"10.1xyz", GREATER, "10xyz"},
|
||||
|
||||
{"xyz10", EQUAL, "xyz10"},
|
||||
{"xyz10", LESS, "xyz10.1"},
|
||||
{"xyz10.1", GREATER, "xyz10"},
|
||||
|
||||
{"xyz.4", EQUAL, "xyz.4"},
|
||||
{"xyz.4", LESS, "8"},
|
||||
{"8", GREATER, "xyz.4"},
|
||||
{"xyz.4", LESS, "2"},
|
||||
{"2", GREATER, "xyz.4"},
|
||||
|
||||
{"5.5p2", LESS, "5.6p1"},
|
||||
{"5.6p1", GREATER, "5.5p2"},
|
||||
|
||||
{"5.6p1", LESS, "6.5p1"},
|
||||
{"6.5p1", GREATER, "5.6p1"},
|
||||
|
||||
{"6.0.rc1", GREATER, "6.0"},
|
||||
{"6.0", LESS, "6.0.rc1"},
|
||||
|
||||
{"10b2", GREATER, "10a1"},
|
||||
{"10a2", LESS, "10b2"},
|
||||
|
||||
{"1.0aa", EQUAL, "1.0aa"},
|
||||
{"1.0a", LESS, "1.0aa"},
|
||||
{"1.0aa", GREATER, "1.0a"},
|
||||
|
||||
{"10.0001", EQUAL, "10.0001"},
|
||||
{"10.0001", EQUAL, "10.1"},
|
||||
{"10.1", EQUAL, "10.0001"},
|
||||
{"10.0001", LESS, "10.0039"},
|
||||
{"10.0039", GREATER, "10.0001"},
|
||||
|
||||
{"4.999.9", LESS, "5.0"},
|
||||
{"5.0", GREATER, "4.999.9"},
|
||||
|
||||
{"20101121", EQUAL, "20101121"},
|
||||
{"20101121", LESS, "20101122"},
|
||||
{"20101122", GREATER, "20101121"},
|
||||
|
||||
{"2_0", EQUAL, "2_0"},
|
||||
{"2.0", EQUAL, "2_0"},
|
||||
{"2_0", EQUAL, "2.0"},
|
||||
|
||||
// RhBug:178798 case
|
||||
{"a", EQUAL, "a"},
|
||||
{"a+", EQUAL, "a+"},
|
||||
{"a+", EQUAL, "a_"},
|
||||
{"a_", EQUAL, "a+"},
|
||||
{"+a", EQUAL, "+a"},
|
||||
{"+a", EQUAL, "_a"},
|
||||
{"_a", EQUAL, "+a"},
|
||||
{"+_", EQUAL, "+_"},
|
||||
{"_+", EQUAL, "+_"},
|
||||
{"_+", EQUAL, "_+"},
|
||||
{"+", EQUAL, "_"},
|
||||
{"_", EQUAL, "+"},
|
||||
|
||||
// Basic testcases for tilde sorting
|
||||
{"1.0~rc1", EQUAL, "1.0~rc1"},
|
||||
{"1.0~rc1", LESS, "1.0"},
|
||||
{"1.0", GREATER, "1.0~rc1"},
|
||||
{"1.0~rc1", LESS, "1.0~rc2"},
|
||||
{"1.0~rc2", GREATER, "1.0~rc1"},
|
||||
{"1.0~rc1~git123", EQUAL, "1.0~rc1~git123"},
|
||||
{"1.0~rc1~git123", LESS, "1.0~rc1"},
|
||||
{"1.0~rc1", GREATER, "1.0~rc1~git123"},
|
||||
|
||||
// These are included here to document current, arguably buggy behaviors
|
||||
// for reference purposes and for easy checking against unintended
|
||||
// behavior changes.
|
||||
//
|
||||
// AT_BANNER([RPM version comparison oddities])
|
||||
// RhBug:811992 case
|
||||
// {"1b.fc17", EQUAL, "1b.fc17"},
|
||||
// {"1b.fc17", LESS, "1.fc17"},
|
||||
// {"1.fc17", GREATER, "1b.fc17"},
|
||||
// {"1g.fc17", EQUAL, "1g.fc17"},
|
||||
// {"1g.fc17", GREATER, "1.fc17"},
|
||||
// {"1.fc17", LESS, "1g.fc17"},
|
||||
|
||||
// Non-ascii characters are considered equal so these are all the same, eh...
|
||||
// {"1.1.α", EQUAL, "1.1.α"},
|
||||
// {"1.1.α", EQUAL, "1.1.β"},
|
||||
// {"1.1.β", EQUAL, "1.1.α"},
|
||||
// {"1.1.αα", EQUAL, "1.1.α"},
|
||||
// {"1.1.α", EQUAL, "1.1.ββ"},
|
||||
// {"1.1.ββ", EQUAL, "1.1.αα"},
|
||||
}
|
||||
|
||||
var (
|
||||
|
Loading…
Reference in New Issue
Block a user