42 lines
1.2 KiB
Go
42 lines
1.2 KiB
Go
package alpine
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import (
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"fmt"
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"os"
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"os/user"
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)
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// CreateUser creates a user in Alpine with the given UID.
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func (c *configurator) CreateUser(username string, uid int) (createdUsername string, err error) {
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UIDStr := fmt.Sprintf("%d", uid)
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u, err := c.osUser.LookupID(UIDStr)
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_, unknownUID := err.(user.UnknownUserIdError)
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if err != nil && !unknownUID {
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return "", fmt.Errorf("cannot create user: %w", err)
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} else if u != nil {
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if u.Username == username {
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return "", nil
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}
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return u.Username, nil
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}
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u, err = c.osUser.Lookup(username)
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_, unknownUsername := err.(user.UnknownUserError)
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if err != nil && !unknownUsername {
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return "", fmt.Errorf("cannot create user: %w", err)
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} else if u != nil {
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return "", fmt.Errorf("cannot create user: user with name %s already exists for ID %s instead of %d",
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username, u.Uid, uid)
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}
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file, err := c.openFile("/etc/passwd", os.O_APPEND|os.O_WRONLY, 0644)
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if err != nil {
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return "", fmt.Errorf("cannot create user: %w", err)
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}
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s := fmt.Sprintf("%s:x:%d:::/dev/null:/sbin/nologin\n", username, uid)
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_, err = file.WriteString(s)
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if err != nil {
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_ = file.Close()
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return "", err
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}
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return username, file.Close()
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}
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