89 lines
2.7 KiB
Go
89 lines
2.7 KiB
Go
package lfs
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import (
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"fmt"
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"regexp"
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"strings"
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"github.com/github/git-lfs/git"
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)
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var (
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valueRegexp = regexp.MustCompile("\\Agit[\\-\\s]media")
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)
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// Attribute wraps the structure and some operations of Git's conception of an
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// "attribute", as defined here: http://git-scm.com/docs/gitattributes.
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type Attribute struct {
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// The Section of an Attribute refers to the location at which all
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// properties are relative to. For example, for a Section with the value
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// "core", Git will produce something like:
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//
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// [core]
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// autocrlf = true
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// ...
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Section string
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// The Properties of an Attribute refer to all of the keys and values
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// that define that Attribute.
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Properties map[string]string
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}
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// Install instructs Git to set all keys and values relative to the root
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// location of this Attribute. For any particular key/value pair, if a matching
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// key is already set, it will be overridden if it is either a) empty, or b) the
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// `force` argument is passed as true. If an attribute is already set to a
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// different value than what is given, and force is false, an error will be
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// returned immediately, and the rest of the attributes will not be set.
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func (a *Attribute) Install(force bool) error {
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for k, v := range a.Properties {
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key := a.normalizeKey(k)
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if err := a.set(key, v, force); err != nil {
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return err
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}
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}
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return nil
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}
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// normalizeKey makes an absolute path out of a partial relative one. For a
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// relative path of "foo", and a root Section of "bar", "bar.foo" will be returned.
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func (a *Attribute) normalizeKey(relative string) string {
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return strings.Join([]string{a.Section, relative}, ".")
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}
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// set attempts to set a single key/value pair portion of this Attribute. If a
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// matching key already exists and the value is not equal to the desired value,
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// an error will be thrown if force is set to false. If force is true, the value
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// will be overridden.
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func (a *Attribute) set(key, value string, force bool) error {
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currentValue := git.Config.Find(key)
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if force || shouldReset(currentValue) {
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git.Config.UnsetGlobal(key)
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git.Config.SetGlobal(key, value)
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return nil
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} else if currentValue != value {
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return fmt.Errorf("The %s attribute should be \"%s\" but is \"%s\"",
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key, value, currentValue)
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}
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return nil
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}
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// Uninstall removes all properties in the path of this property.
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func (a *Attribute) Uninstall() {
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git.Config.UnsetGlobalSection(a.Section)
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}
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// shouldReset determines whether or not a value is resettable given its current
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// value on the system. If the value is empty (length = 0), then it will pass.
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// Otherwise, it will pass if the below regex matches.
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func shouldReset(value string) bool {
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if len(value) == 0 {
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return true
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}
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return valueRegexp.MatchString(value)
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}
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