77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
package instruction
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import (
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"fmt"
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"github.com/xdrm-brackets/nix-amer/internal/exec"
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"github.com/xdrm-brackets/nix-amer/internal/pkg"
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"github.com/xdrm-brackets/nix-amer/internal/ser"
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)
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// T is the instruction common interface
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type T interface {
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// Raw input line
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Raw() string
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// Build the instruction with input arguments
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Build(string) error
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// Exec the given instruction
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Exec(ExecutionContext) ([]byte, error)
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// DryRun checks the success of the given instruction without actually running it (non-destructive)
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DryRun(ExecutionContext) ([]byte, error)
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}
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// ExecutionContext contains system-specific drivers to manage the host
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type ExecutionContext struct {
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PackageManager pkg.PackageManager
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ServiceManager ser.ServiceManager
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Executor exec.Executor
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Alias map[string]string
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}
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// CreateContext creates an execution contet with the given package-manager and service-manager
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// default values are taken from each go package (pkg, ser)
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// if _exec is set, it will override the default (os) executor
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func CreateContext(_pkg, _ser string, _exec ...exec.Executor) (*ExecutionContext, error) {
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// 1. fail if no value and no defaults
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if len(_pkg)+len(pkg.DefaultManager) < 1 {
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return nil, fmt.Errorf("missing package manager")
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}
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if len(_ser)+len(ser.DefaultManager) < 1 {
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return nil, fmt.Errorf("missing service manager")
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}
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// 2. set default
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if len(_pkg) < 1 {
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_pkg = pkg.DefaultManager
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}
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if len(_ser) < 1 {
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_ser = ser.DefaultManager
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}
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var executor exec.Executor = new(exec.Default)
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// 3. load custom executor (optional)
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if len(_exec) > 0 && _exec[0] != nil {
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executor = _exec[0]
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}
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// 4. load managers
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pkg, err := pkg.Load(_pkg, executor)
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if err != nil {
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return nil, fmt.Errorf("package manager: %s", err)
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}
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ser, err := ser.Load(_ser, executor)
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if err != nil {
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return nil, fmt.Errorf("service manager: %s", err)
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}
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// 4. build context
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return &ExecutionContext{
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PackageManager: pkg,
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ServiceManager: ser,
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Executor: executor,
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Alias: make(map[string]string),
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}, nil
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}
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