Caleb
80 lines
2.3 KiB
Go
80 lines
2.3 KiB
Go
package appimg
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// Thanks to probono for the majority of this C code: https://discourse.appimage.org/t/accessing-appimage-desktop-file/173/4?u=calebq42
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/*
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#cgo CFLAGS: -I/usr/lib
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#cgo LDFLAGS: -L/usr/lib/libappimage.so -lappimage
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#include <appimage/appimage.h>
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#include <stdlib.h>
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int char_length(char** in){
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int i = 0;
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for (; in[i] != NULL ; i++);
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return i;
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}
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*/
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import "C"
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import (
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"errors"
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"os"
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"strings"
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"unsafe"
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)
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var (
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//ErrNotAppImage return if the given location does not point to an AppImage
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ErrNotAppImage = errors.New("file is not an appimage")
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)
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//Thanks to https://stackoverflow.com/questions/36188649/cgo-char-to-slice-string for char** to string slice code :)
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//GetDesktopFile tries to find the desktop file inside the appimage at appimageLoc and extract it to extractLoc.
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//extractLoc is deleted first to provent conflicts.
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func GetDesktopFile(appimageLoc string, extractLoc string) (*os.File, error) {
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if !strings.HasSuffix(appimageLoc, ".AppImage") {
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return nil, ErrNotAppImage
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}
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err := os.Remove(extractLoc)
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if err != os.ErrNotExist {
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return nil, err
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}
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cextractLoc := C.CString(extractLoc)
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defer C.free(unsafe.Pointer(cextractLoc))
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cloc := C.CString(appimageLoc)
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defer C.free(unsafe.Pointer(cloc))
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cfiles := C.appimage_list_files(cloc)
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defer C.appimage_string_list_free(cfiles)
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cfilesLength := C.char_length(cfiles)
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tmpslice := (*[1 << 30]*C.char)(unsafe.Pointer(cfiles))[:cfilesLength:cfilesLength]
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for _, v := range tmpslice {
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tmp := C.GoString(v)
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if strings.HasSuffix(tmp, ".desktop") {
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C.appimage_extract_file_following_symlinks(cloc, v, cextractLoc)
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break
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}
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}
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return os.Open(extractLoc)
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}
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//ExtractFile tries to extract the file at fileLoc to extractLoc from the appimage at appimageLoc.
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//extractLoc is deleted first to provent conflicts.
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func ExtractFile(appimageLoc string, fileLoc string, extractLoc string) (*os.File, error) {
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if !strings.HasSuffix(appimageLoc, ".AppImage") {
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return nil, ErrNotAppImage
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}
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err := os.Remove(extractLoc)
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if err != os.ErrNotExist {
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return nil, err
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}
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cextractLoc := C.CString(extractLoc)
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defer C.free(unsafe.Pointer(cextractLoc))
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cloc := C.CString(appimageLoc)
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defer C.free(unsafe.Pointer(cloc))
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cfileLoc := C.CString(fileLoc)
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defer C.free(unsafe.Pointer(cfileLoc))
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C.appimage_extract_file_following_symlinks(cloc, cfileLoc, cextractLoc)
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return os.Open(extractLoc)
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}
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