update some stuff for paths, add env mappings
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c1fc07de50
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208
funcs.go
Normal file
208
funcs.go
Normal file
@ -0,0 +1,208 @@
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package sysutils
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import (
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`os`
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`runtime`
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`strconv`
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`strings`
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)
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/*
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EnvMapper contains the environment variables as grouped by their basic type.
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If a variable's type cannot be determined, it's placed in Strings.
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If a variable's type is a list, it will be an []interface{} as each item may be a different variable type.
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It essentially is the same as EnvMap except with the types split out for convenience.
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*/
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type EnvMapper struct {
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Booleans map[string]bool `json:"bools"`
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Numbers map[string]int `json:"nums"`
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Strings map[string]string `json:"strings"`
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Lists map[string][]interface{} `json:"lists"`
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}
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// GetEnvMapper returns a pointer to a populated EnvMapper.
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func GetEnvMapper() (e *EnvMapper, err error) {
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var em map[string]interface{}
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var env EnvMapper
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env = EnvMapper{
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Booleans: nil,
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Numbers: nil,
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Strings: nil,
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Lists: nil,
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}
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for k, v := range em {
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switch t := v.(type) {
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case bool:
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if env.Booleans == nil {
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env.Booleans = make(map[string]bool, 0)
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}
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env.Booleans[k] = t
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continue
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case int:
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if env.Numbers == nil {
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env.Numbers = make(map[string]int, 0)
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}
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env.Numbers[k] = t
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continue
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case []interface{}:
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if env.Lists == nil {
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env.Lists = make(map[string][]interface{}, 0)
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}
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env.Lists[k] = t
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case string: // the "default" since everything could probably be typeswitched to a string otherwise.
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if env.Strings == nil {
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env.Strings = make(map[string]string, 0)
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}
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env.Strings[k] = t
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}
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}
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*e = env
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return
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}
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/*
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EnvMap returns a map of environment variables.
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The variable is an interface due to it attempting to use a variable's value to its "true" native type.
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If a type cannot be determined, it will be treated a string.
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*/
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func EnvMap() (envs map[string]interface{}, err error) {
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var ems map[string]string
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if ems, err = EnvMapString(); err != nil {
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return
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}
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for k, v := range ems {
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// Is int?
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if i, ok := getNum(v); ok {
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envs[k] = i
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continue
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}
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// Is bool?
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if b, ok := getBool(v); ok {
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envs[k] = b
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continue
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}
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// Is array?
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if a, ok := getArr(v); ok {
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envs[k] = a
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continue
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}
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// It's a string (probably).
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envs[k] = v
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}
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return
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}
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// EnvMapString is like EnvMap, but all values are treated as strings.
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func EnvMapString() (envs map[string]string, err error) {
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var envArray []string
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envs = make(map[string]string, 0)
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envArray = os.Environ()
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for _, e := range envArray {
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var k, v string
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var kv []string
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kv = strings.SplitN(e, "=", 2)
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k = kv[0]
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if len(kv) == 2 {
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v = kv[1]
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} else {
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v = ""
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}
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envs[k] = v
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}
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return
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}
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// UTILITY FUNCS
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// getBool attempts to convert a string value to a boolean.
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func getBool(s string) (b bool, ok bool) {
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switch s2 := strings.ToLower(strings.TrimSpace(s)); s2 {
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case "true", "yes", "y":
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b = true
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ok = true
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case "false", "no", "n":
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b = false
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ok = true
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}
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return
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}
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// getNum attempts to convert a string value to an int.
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func getNum(s string) (n int, ok bool) {
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var err error
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if n, err = strconv.Atoi(s); err == nil {
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ok = true
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}
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return
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}
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// getArr attempts to convert a string value to an array of interface{}.
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func getArr(s string) (a []interface{}, ok bool) {
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var arrS []string
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if arrS, ok = getArrStr(s); !ok {
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return
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}
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a = make([]interface{}, len(arrS))
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for idx, i := range arrS {
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if b, ok := getBool(i); ok {
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a[idx] = b
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} else if n, ok := getNum(i); ok {
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a[idx] = n
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} else if l, ok := getArr(i); ok {
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a[idx] = l
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} else {
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a[idx] = i
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}
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}
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return
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}
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// getArrStr attempts to convert a string value to an array of strings.
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func getArrStr(s string) (a []string, ok bool) {
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var sep string = ":"
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if runtime.GOOS == "windows" {
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sep = ";"
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}
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a = strings.Split(s, sep)
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l := len(s)
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if l <= 1 {
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return
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}
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ok = true
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return
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}
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@ -63,7 +63,7 @@ func main() {
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"\tService: %v\n" +
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"\tDesc: %v\n" +
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"\tReserved?: %v\n",
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p.Number, p.Proto.Name, p.ServiceName, p.Description, p.Reserved)
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p.Number, p.Protocol.Name, p.ServiceName, p.Description, p.Reserved)
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}
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----
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149
paths/func.go
149
paths/func.go
@ -20,108 +20,155 @@ package paths
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import (
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"errors"
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"fmt"
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`fmt`
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"os"
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"os/user"
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"path/filepath"
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`runtime`
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// "strconv"
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"strings"
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// "syscall"
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)
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var err error
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/*
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ExpandHome will take a tilde(~)-prefixed path and resolve it to the actual path in-place.
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Note that it only works for current user; the syntax ~someotheruser/foo/bar is currently unsupported.
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*/
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func ExpandHome(path *string) (err error) {
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var usr *user.User
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func ExpandHome(path *string) error {
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// Props to this guy.
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// https://stackoverflow.com/a/43578461/733214
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if len(*path) == 0 {
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return errors.New("empty path")
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err = errors.New("empty path")
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return
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} else if (*path)[0] != '~' {
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return nil
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return
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}
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// E(ffective)UID (e.g. chown'd user for SUID)
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/*
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uid := strconv.Itoa(syscall.Geteuid())
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usr, err := user.LookupId(euid)
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*/
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// R(real)UID (invoking user)
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usr, err := user.Current()
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if err != nil {
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// (Real)UID (invoking user)
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if usr, err = user.Current(); err != nil {
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return err
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}
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*path = filepath.Join(usr.HomeDir, (*path)[1:])
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return nil
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return
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}
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func GetPathEnv() ([]string, error) {
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paths := []string{}
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for _, p := range strings.Split(os.Getenv("PATH"), ":") {
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// GetPathEnv returns a slice of the PATH variable's items.
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func GetPathEnv() (paths []string, err error) {
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var pathVar string = "PATH"
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var sep string = ":"
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paths = make([]string, 0)
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if runtime.GOOS == "windows" {
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pathVar = "Path"
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sep = ";"
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}
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for _, p := range strings.Split(os.Getenv(pathVar), sep) {
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if err = RealPath(&p); err != nil {
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return nil, err
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return
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}
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paths = append(paths, p)
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}
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return paths, nil
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return
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}
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func MakeDirIfNotExist(path *string) error {
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exists, stat, err := RealPathExistsStat(path)
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if err != nil {
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// MakeDirIfNotExist will create a directory at a given path if it doesn't exist.
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func MakeDirIfNotExist(path string) (err error) {
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var stat os.FileInfo
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var exists bool
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var locPath string = path
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if exists, stat, err = RealPathExistsStat(&locPath); err != nil {
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if !exists {
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// This, at least as of golang 1.15, uses the user's umask.
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// It does not actually create a dir with 0777.
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// It's up to the caller to do an os.Chmod() on the path after, if desired.
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os.MkdirAll(*path, 0777)
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return nil
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if err = os.MkdirAll(locPath, 0777); err != nil {
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return
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}
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err = nil
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return
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} else {
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return err
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return
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}
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}
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// So it exists, but it probably isn't a dir.
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if !stat.Mode().IsDir() {
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return errors.New(fmt.Sprintf("path %v exists but is not a directory", *path))
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err = errors.New(fmt.Sprintf("path %v exists but is not a directory", locPath))
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return
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}
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// This should probably never happen. Probably.
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return errors.New("undefined behaviour")
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err = errors.New("undefined")
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return
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}
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func RealPath(path *string) error {
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err := ExpandHome(path)
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if err != nil {
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return err
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// RealPath will transform a given path into the very best guess for an absolute path in-place.
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func RealPath(path *string) (err error) {
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if err = ExpandHome(path); err != nil {
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return
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}
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*path, err = filepath.Abs(*path)
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if err != nil {
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return err
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if *path, err = filepath.Abs(*path); err != nil {
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return
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}
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return nil
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return
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}
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func RealPathExists(path *string) (bool, error) {
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// I know it's hacky, but we use the bool as a sort of proto-state-machine thing.
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// If err != nil and bool is true, the error occurred during path absolution.
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// If err != nil and bool is false, the path does not exist.
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err := RealPath(path)
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if err != nil {
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return true, err
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/*
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RealPathExists is like RealPath, but will also return a boolean as to whether the path
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actually exists or not.
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It's hacky, but the "exists" bool along with err is a sort of proto-state-machine.
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If err != nil and bool is true, the error occurred during path absolution.
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If err != nil and bool is false, the path does not exist.
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*/
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func RealPathExists(path *string) (exists bool, err error) {
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if err = RealPath(path); err != nil {
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exists = true
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return
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}
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if _, err := os.Stat(*path); err != nil {
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return false, err
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if _, err = os.Stat(*path); err != nil {
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return
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}
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return true, nil
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exists = true
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return
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}
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func RealPathExistsStat(path *string) (bool, os.FileInfo, error) {
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// Same deal as RealPathExists.
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// If err != nil and bool is true, the error occurred during path absolution.
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// If err != nil and bool is false, the path does not exist.
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err := RealPath(path)
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if err != nil {
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return true, nil, err
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// RealPathExistsStat is like RealPathExists except it will also return the os.FileInfo for the path (assuming it exists).
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func RealPathExistsStat(path *string) (exists bool, stat os.FileInfo, err error) {
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// See the comments for RealPathExists for details on this.
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if err = RealPath(path); err != nil {
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exists = true
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return
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}
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stat, err := os.Stat(*path)
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if err != nil {
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return false, nil, err
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if stat, err = os.Stat(*path); err != nil {
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return
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}
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return true, stat, nil
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exists = true
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return
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}
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