87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
package pqutil
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import (
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"errors"
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"fmt"
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"io"
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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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"syscall"
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)
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// Home gets the PostgreSQL configuration dir in the user's home directory:
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// %APPDATA%/postgresql on Windows, and $HOME/.postgresql/postgresql.crt
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// everywhere else.
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//
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// Returns an empy string if no home directory was found.
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//
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// Matches pqGetHomeDirectory() from PostgreSQL.
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// https://github.com/postgres/postgres/blob/2b117bb/src/interfaces/libpq/fe-connect.c#L8214
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func Home() string {
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if runtime.GOOS == "windows" {
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// pq uses SHGetFolderPath(), which is deprecated but x/sys/windows has
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// KnownFolderPath(). We don't really want to pull that in though, so
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// use APPDATA env. This is also what PostgreSQL uses in some other
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// codepaths (get_home_path() for example).
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ad := os.Getenv("APPDATA")
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if ad == "" {
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return ""
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}
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return filepath.Join(ad, "postgresql")
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}
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home, _ := os.UserHomeDir()
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if home == "" {
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u, err := user.Current()
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if err != nil {
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return ""
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}
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home = u.HomeDir
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}
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return filepath.Join(home, ".postgresql")
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}
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// ErrNotExists reports if err is a "path doesn't exist" type error.
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//
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// fs.ErrNotExist is not enough, as "/dev/null/somefile" will return ENOTDIR
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// instead of ENOENT.
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func ErrNotExists(err error) bool {
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perr := new(os.PathError)
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if errors.As(err, &perr) && (perr.Err == syscall.ENOENT || perr.Err == syscall.ENOTDIR) {
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return true
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}
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return false
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}
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var WarnFD io.Writer = os.Stderr
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// Pgpass gets the filepath to the pgpass file to use, returning "" if a pgpass
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// file shouldn't be used.
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func Pgpass(passfile string) string {
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// Get passfile from the options.
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if passfile == "" {
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home := Home()
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if home == "" {
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return ""
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}
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passfile = filepath.Join(home, ".pgpass")
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}
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// On Win32, the directory is protected, so we don't have to check the file.
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if runtime.GOOS != "windows" {
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fi, err := os.Stat(passfile)
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if err != nil {
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return ""
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}
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if fi.Mode().Perm()&(0x77) != 0 {
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fmt.Fprintf(WarnFD,
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"WARNING: password file %q has group or world access; permissions should be u=rw (0600) or less\n",
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passfile)
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return ""
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}
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}
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return passfile
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}
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