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make version comparision more similar to that of dpkg

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Initially found by automated repository health checks used by Termux
in https://github.com/termux/termux-packages/issues/27472

The root problem was 4.3.5a comparing less than 4.3.5-rc1-1 by aptly
According to debian "4.3.5a" > "4.3.5-rc1-1"

This is because dpkg splits hyphen for revision at the first hyphen,
whereas aptly was splitting at the last hyphen which is different from
dpkg's behaviour.

dpkg behaviour: https://git.dpkg.org/cgit/dpkg/dpkg.git/tree/lib/dpkg/parsehelp.c#n242

Perhaps this wasn't detected as there was broken tests in the repository
since the initial commit of aptly. This also fixes those tests
This commit is contained in:
Yaksh Bariya
2025-12-01 00:22:50 +05:30
parent ba65daf6cb
commit e0f282aca9
2 changed files with 9 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
deb/version.go
+6 -6
View File
@@ -30,16 +30,16 @@ func CompareVersions(ver1, ver2 string) int {
// parseVersions breaks down full version to components (possibly empty)
func parseVersion(ver string) (epoch, upstream, debian string) {
i := strings.LastIndex(ver, "-")
if i != -1 {
debian, ver = ver[i+1:], ver[:i]
}
i = strings.Index(ver, ":")
i := strings.Index(ver, ":")
if i != -1 {
epoch, ver = ver[:i], ver[i+1:]
}
i = strings.Index(ver, "-")
if i != -1 {
debian, ver = ver[i+1:], ver[:i]
}
upstream = ver
return