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image.go
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image.go
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package google
import (
"fmt"
"regexp"
"strings"
"google.golang.org/api/googleapi"
)
const (
resolveImageProjectRegex = "[-_a-zA-Z0-9]*"
resolveImageFamilyRegex = "[-_a-zA-Z0-9]*"
resolveImageImageRegex = "[-_a-zA-Z0-9]*"
)
var (
resolveImageProjectImage = regexp.MustCompile(fmt.Sprintf("projects/(%s)/global/images/(%s)$", resolveImageProjectRegex, resolveImageImageRegex))
resolveImageProjectFamily = regexp.MustCompile(fmt.Sprintf("projects/(%s)/global/images/family/(%s)$", resolveImageProjectRegex, resolveImageFamilyRegex))
resolveImageGlobalImage = regexp.MustCompile(fmt.Sprintf("^global/images/(%s)$", resolveImageImageRegex))
resolveImageGlobalFamily = regexp.MustCompile(fmt.Sprintf("^global/images/family/(%s)$", resolveImageFamilyRegex))
resolveImageFamilyFamily = regexp.MustCompile(fmt.Sprintf("^family/(%s)$", resolveImageFamilyRegex))
resolveImageProjectImageShorthand = regexp.MustCompile(fmt.Sprintf("^(%s)/(%s)$", resolveImageProjectRegex, resolveImageImageRegex))
resolveImageProjectFamilyShorthand = regexp.MustCompile(fmt.Sprintf("^(%s)/(%s)$", resolveImageProjectRegex, resolveImageFamilyRegex))
resolveImageFamily = regexp.MustCompile(fmt.Sprintf("^(%s)$", resolveImageFamilyRegex))
resolveImageImage = regexp.MustCompile(fmt.Sprintf("^(%s)$", resolveImageImageRegex))
resolveImageLink = regexp.MustCompile(fmt.Sprintf("^https://www.googleapis.com/compute/[a-z0-9]+/projects/(%s)/global/images/(%s)", resolveImageProjectRegex, resolveImageImageRegex))
)
// built-in projects to look for images/families containing the string
// on the left in
var imageMap = map[string]string{
"centos": "centos-cloud",
"coreos": "coreos-cloud",
"debian": "debian-cloud",
"opensuse": "opensuse-cloud",
"rhel": "rhel-cloud",
"sles": "suse-cloud",
"ubuntu": "ubuntu-os-cloud",
"windows": "windows-cloud",
}
func resolveImageImageExists(c *Config, project, name string) (bool, error) {
if _, err := c.clientCompute.Images.Get(project, name).Do(); err == nil {
return true, nil
} else if gerr, ok := err.(*googleapi.Error); ok && gerr.Code == 404 {
return false, nil
} else {
return false, fmt.Errorf("Error checking if image %s exists: %s", name, err)
}
}
func resolveImageFamilyExists(c *Config, project, name string) (bool, error) {
if _, err := c.clientCompute.Images.GetFromFamily(project, name).Do(); err == nil {
return true, nil
} else if gerr, ok := err.(*googleapi.Error); ok && gerr.Code == 404 {
return false, nil
} else {
return false, fmt.Errorf("Error checking if family %s exists: %s", name, err)
}
}
func sanityTestRegexMatches(expected int, got []string, regexType, name string) error {
if len(got)-1 != expected { // subtract one, index zero is the entire matched expression
return fmt.Errorf("Expected %d %s regex matches, got %d for %s", expected, regexType, len(got)-1, name)
}
return nil
}
// If the given name is a URL, return it.
// If it's in the form projects/{project}/global/images/{image}, return it
// If it's in the form projects/{project}/global/images/family/{family}, return it
// If it's in the form global/images/{image}, return it
// If it's in the form global/images/family/{family}, return it
// If it's in the form family/{family}, check if it's a family in the current project. If it is, return it as global/images/family/{family}.
// If not, check if it could be a GCP-provided family, and if it exists. If it does, return it as projects/{project}/global/images/family/{family}.
// If it's in the form {project}/{family-or-image}, check if it's an image in the named project. If it is, return it as projects/{project}/global/images/{image}.
// If not, check if it's a family in the named project. If it is, return it as projects/{project}/global/images/family/{family}.
// If it's in the form {family-or-image}, check if it's an image in the current project. If it is, return it as global/images/{image}.
// If not, check if it could be a GCP-provided image, and if it exists. If it does, return it as projects/{project}/global/images/{image}.
// If not, check if it's a family in the current project. If it is, return it as global/images/family/{family}.
// If not, check if it could be a GCP-provided family, and if it exists. If it does, return it as projects/{project}/global/images/family/{family}
func resolveImage(c *Config, project, name string) (string, error) {
var builtInProject string
for k, v := range imageMap {
if strings.Contains(name, k) {
builtInProject = v
break
}
}
switch {
case resolveImageLink.MatchString(name): // https://www.googleapis.com/compute/v1/projects/xyz/global/images/xyz
return name, nil
case resolveImageProjectImage.MatchString(name): // projects/xyz/global/images/xyz
res := resolveImageProjectImage.FindStringSubmatch(name)
if err := sanityTestRegexMatches(2, res, "project image", name); err != nil {
return "", err
}
return fmt.Sprintf("projects/%s/global/images/%s", res[1], res[2]), nil
case resolveImageProjectFamily.MatchString(name): // projects/xyz/global/images/family/xyz
res := resolveImageProjectFamily.FindStringSubmatch(name)
if err := sanityTestRegexMatches(2, res, "project family", name); err != nil {
return "", err
}
return fmt.Sprintf("projects/%s/global/images/family/%s", res[1], res[2]), nil
case resolveImageGlobalImage.MatchString(name): // global/images/xyz
res := resolveImageGlobalImage.FindStringSubmatch(name)
if err := sanityTestRegexMatches(1, res, "global image", name); err != nil {
return "", err
}
return fmt.Sprintf("global/images/%s", res[1]), nil
case resolveImageGlobalFamily.MatchString(name): // global/images/family/xyz
res := resolveImageGlobalFamily.FindStringSubmatch(name)
if err := sanityTestRegexMatches(1, res, "global family", name); err != nil {
return "", err
}
return fmt.Sprintf("global/images/family/%s", res[1]), nil
case resolveImageFamilyFamily.MatchString(name): // family/xyz
res := resolveImageFamilyFamily.FindStringSubmatch(name)
if err := sanityTestRegexMatches(1, res, "family family", name); err != nil {
return "", err
}
if ok, err := resolveImageFamilyExists(c, project, res[1]); err != nil {
return "", err
} else if ok {
return fmt.Sprintf("global/images/family/%s", res[1]), nil
}
if builtInProject != "" {
if ok, err := resolveImageFamilyExists(c, builtInProject, res[1]); err != nil {
return "", err
} else if ok {
return fmt.Sprintf("projects/%s/global/images/family/%s", builtInProject, res[1]), nil
}
}
case resolveImageProjectImageShorthand.MatchString(name): // xyz/xyz
res := resolveImageProjectImageShorthand.FindStringSubmatch(name)
if err := sanityTestRegexMatches(2, res, "project image shorthand", name); err != nil {
return "", err
}
if ok, err := resolveImageImageExists(c, res[1], res[2]); err != nil {
return "", err
} else if ok {
return fmt.Sprintf("projects/%s/global/images/%s", res[1], res[2]), nil
}
fallthrough // check if it's a family
case resolveImageProjectFamilyShorthand.MatchString(name): // xyz/xyz
res := resolveImageProjectFamilyShorthand.FindStringSubmatch(name)
if err := sanityTestRegexMatches(2, res, "project family shorthand", name); err != nil {
return "", err
}
if ok, err := resolveImageFamilyExists(c, res[1], res[2]); err != nil {
return "", err
} else if ok {
return fmt.Sprintf("projects/%s/global/images/family/%s", res[1], res[2]), nil
}
case resolveImageImage.MatchString(name): // xyz
res := resolveImageImage.FindStringSubmatch(name)
if err := sanityTestRegexMatches(1, res, "image", name); err != nil {
return "", err
}
if ok, err := resolveImageImageExists(c, project, res[1]); err != nil {
return "", err
} else if ok {
return fmt.Sprintf("global/images/%s", res[1]), nil
}
if builtInProject != "" {
// check the images GCP provides
if ok, err := resolveImageImageExists(c, builtInProject, res[1]); err != nil {
return "", err
} else if ok {
return fmt.Sprintf("projects/%s/global/images/%s", builtInProject, res[1]), nil
}
}
fallthrough // check if the name is a family, instead of an image
case resolveImageFamily.MatchString(name): // xyz
res := resolveImageFamily.FindStringSubmatch(name)
if err := sanityTestRegexMatches(1, res, "family", name); err != nil {
return "", err
}
if ok, err := resolveImageFamilyExists(c, c.Project, res[1]); err != nil {
return "", err
} else if ok {
return fmt.Sprintf("global/images/family/%s", res[1]), nil
}
if builtInProject != "" {
// check the families GCP provides
if ok, err := resolveImageFamilyExists(c, builtInProject, res[1]); err != nil {
return "", err
} else if ok {
return fmt.Sprintf("projects/%s/global/images/family/%s", builtInProject, res[1]), nil
}
}
}
return "", fmt.Errorf("Could not find image or family %s", name)
}