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package git
import (
"regexp"
"strconv"
"sync"
"github.com/git-lfs/git-lfs/v3/subprocess"
"github.com/rubyist/tracerx"
)
var (
gitVersionOnce sync.Once
gitVersion string
gitVersionErr error
)
func Version() (string, error) {
gitVersionOnce.Do(func() {
gitVersion, gitVersionErr =
subprocess.SimpleExec("git", "version")
})
return gitVersion, gitVersionErr
}
// IsVersionAtLeast returns whether the git version is the one specified or higher
// argument is plain version string separated by '.' e.g. "2.3.1" but can omit minor/patch
func IsGitVersionAtLeast(ver string) bool {
gitver, err := Version()
if err != nil {
tracerx.Printf("Error getting git version: %v", err)
return false
}
return IsVersionAtLeast(gitver, ver)
}
// IsVersionAtLeast compares 2 version strings (ok to be prefixed with 'git version', ignores)
func IsVersionAtLeast(actualVersion, desiredVersion string) bool {
// Capture 1-3 version digits, optionally prefixed with 'git version' and possibly
// with suffixes which we'll ignore (e.g. unstable builds, MinGW versions)
verregex := regexp.MustCompile(`(?:git version\s+)?(\d+)(?:.(\d+))?(?:.(\d+))?.*`)
var atleast uint64
// Support up to 1000 in major/minor/patch digits
const majorscale = 1000 * 1000
const minorscale = 1000
if match := verregex.FindStringSubmatch(desiredVersion); match != nil {
// Ignore errors as regex won't match anything other than digits
major, _ := strconv.Atoi(match[1])
atleast += uint64(major * majorscale)
if len(match) > 2 {
minor, _ := strconv.Atoi(match[2])
atleast += uint64(minor * minorscale)
}
if len(match) > 3 {
patch, _ := strconv.Atoi(match[3])
atleast += uint64(patch)
}
}
var actual uint64
if match := verregex.FindStringSubmatch(actualVersion); match != nil {
major, _ := strconv.Atoi(match[1])
actual += uint64(major * majorscale)
if len(match) > 2 {
minor, _ := strconv.Atoi(match[2])
actual += uint64(minor * minorscale)
}
if len(match) > 3 {
patch, _ := strconv.Atoi(match[3])
actual += uint64(patch)
}
}
return actual >= atleast
}
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