Unable to install the PyMuPDF python package.

[BabuNamburi]

I am trying to install the PyMuPDF python on tiangolo/uwsgi-nginx-flask:python3.8-alpine. I am seeing the following errors:

ERROR: Command errored out with exit status 1:
   command: /usr/local/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-5cww62wp/PyMuPDF/setup.py'"'"'; __file__='"'"'/tmp/pip-install-5cww62wp/PyMuPDF/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-vw1mjidt
       cwd: /tmp/pip-install-5cww62wp/PyMuPDF/
  Complete output (374 lines):
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-x86_64-3.8
  creating build/lib.linux-x86_64-3.8/fitz
  copying fitz/__init__.py -> build/lib.linux-x86_64-3.8/fitz
  copying fitz/fitz.py -> build/lib.linux-x86_64-3.8/fitz
  copying fitz/utils.py -> build/lib.linux-x86_64-3.8/fitz
  copying fitz/__main__.py -> build/lib.linux-x86_64-3.8/fitz
  running build_ext
  building 'fitz._fitz' extension
  creating build/temp.linux-x86_64-3.8
  creating build/temp.linux-x86_64-3.8/fitz
  gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -DTHREAD_STACK_SIZE=0x100000 -fPIC -I/usr/include/mupdf -I/usr/local/include/mupdf -Imupdf/thirdparty/freetype/include -I/usr/local/include/python3.8 -c fitz/fitz_wrap.c -o build/temp.linux-x86_64-3.8/fitz/fitz_wrap.o
  fitz/fitz_wrap.c: In function 'JM_get_page_labels':
  fitz/fitz_wrap.c:3591:37: warning: passing argument 3 of 'fz_buffer_storage' from incompatible pointer type [-Wincompatible-pointer-types]
   3591 |         fz_buffer_storage(ctx, res, &c);
        |                                     ^~
        |                                     |
        |                                     char **
  In file included from /usr/local/include/mupdf/fitz/output.h:6,
                   from /usr/local/include/mupdf/fitz/hash.h:6,
                   from /usr/include/mupdf/fitz.h:16,
                   from fitz/fitz_wrap.c:2767:
  /usr/local/include/mupdf/fitz/buffer.h:50:75: note: expected 'unsigned char **' but argument is of type 'char **'
     50 | size_t fz_buffer_storage(fz_context *ctx, fz_buffer *buf, unsigned char **datap);
        |                                                           ~~~~~~~~~~~~~~~~^~~~~
  fitz/fitz_wrap.c: In function 'JM_get_fontbuffer':
  fitz/fitz_wrap.c:4165:11: warning: variable 'ext' set but not used [-Wunused-but-set-variable]
   4165 |     char *ext = NULL;
        |           ^~~
  fitz/fitz_wrap.c: In function 'JM_invert_pixmap_rect':
  fitz/fitz_wrap.c:4676:19: warning: operation on 's' may be undefined [-Wsequence-point]
   4676 |                 *s++ = 255 - *s;
        |                  ~^~
  fitz/fitz_wrap.c:4677:30: warning: value computed is not used [-Wunused-value]
   4677 |             if (dest->alpha) *s++;
        |                              ^~~~
  fitz/fitz_wrap.c: In function 'JM_image_profile':
  fitz/fitz_wrap.c:4716:11: warning: pointer targets in assignment from 'char *' to 'unsigned char *' differ in signedness [-Wpointer-sign]
   4716 |         c = PyBytes_AS_STRING(imagedata);
        |           ^
  fitz/fitz_wrap.c:4719:11: warning: pointer targets in assignment from 'char *' to 'unsigned char *' differ in signedness [-Wpointer-sign]
   4719 |         c = PyByteArray_AS_STRING(imagedata);
        |           ^
  fitz/fitz_wrap.c: In function 'JM_delete_annot':
  fitz/fitz_wrap.c:5172:18: warning: unused variable 'popup' [-Wunused-variable]
   5172 |         pdf_obj *popup = pdf_dict_get(ctx, annot->obj, PDF_NAME(Popup));
        |                  ^~~~~
  fitz/fitz_wrap.c: In function 'JM_get_annot_by_xref':
  fitz/fitz_wrap.c:5355:12: warning: unused variable 'len' [-Wunused-variable]
   5355 |     size_t len = 0;
        |            ^~~
  fitz/fitz_wrap.c: In function 'JM_append_rune':
  fitz/fitz_wrap.c:5411:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   5411 |     if (ch >= 32 && ch <= 127 || ch == 10) {
        |         ~~~~~~~~~^~~~~~~~~~~~
  fitz/fitz_wrap.c: In function 'JM_new_javascript':
  fitz/fitz_wrap.c:6283:47: warning: pointer targets in passing argument 2 of 'fz_new_buffer_from_copied_data' differ in signedness [-Wpointer-sign]
   6283 |     res = fz_new_buffer_from_copied_data(ctx, data, strlen(data));
        |                                               ^~~~
        |                                               |
        |                                               char *
  In file included from /usr/local/include/mupdf/fitz/output.h:6,
                   from /usr/local/include/mupdf/fitz/hash.h:6,
                   from /usr/include/mupdf/fitz.h:16,
                   from fitz/fitz_wrap.c:2767:
  /usr/local/include/mupdf/fitz/buffer.h:83:12: note: expected 'const unsigned char *' but argument is of type 'char *'
     83 | fz_buffer *fz_new_buffer_from_copied_data(fz_context *ctx, const unsigned char *data, size_t size);
        |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  fitz/fitz_wrap.c: In function 'JM_choice_options':
  fitz/fitz_wrap.c:6662:19: warning: unused variable 'pdf' [-Wunused-variable]
   6662 |     pdf_document *pdf = pdf_get_bound_document(ctx, annot->obj);
        |                   ^~~
  fitz/fitz_wrap.c: In function 'JM_get_widget_properties':
  fitz/fitz_wrap.c:6720:16: warning: unused variable 'res' [-Wunused-variable]
   6720 |     fz_buffer *res = NULL;
        |                ^~~
  fitz/fitz_wrap.c:6719:39: warning: unused variable 'o' [-Wunused-variable]
   6719 |     pdf_obj *obj = NULL, *js = NULL, *o = NULL;
        |                                       ^
  fitz/fitz_wrap.c:6719:27: warning: unused variable 'js' [-Wunused-variable]
   6719 |     pdf_obj *obj = NULL, *js = NULL, *o = NULL;
        |                           ^~
  fitz/fitz_wrap.c: In function 'JM_set_widget_properties':
  fitz/fitz_wrap.c:6854:9: warning: variable 'result' set but not used [-Wunused-but-set-variable]
   6854 |     int result = 0;
        |         ^~~~~~
  fitz/fitz_wrap.c: In function 'JM_embed_file':
  fitz/fitz_wrap.c:7119:64: warning: pointer targets in passing argument 2 of 'fz_new_buffer_from_copied_data' differ in signedness [-Wpointer-sign]
   7119 |                            fz_new_buffer_from_copied_data(ctx, "  ", 1),
        |                                                                ^~~~
        |                                                                |
        |                                                                char *
  In file included from /usr/local/include/mupdf/fitz/output.h:6,
                   from /usr/local/include/mupdf/fitz/hash.h:6,
                   from /usr/include/mupdf/fitz.h:16,
                   from fitz/fitz_wrap.c:2767:
  /usr/local/include/mupdf/fitz/buffer.h:83:12: note: expected 'const unsigned char *' but argument is of type 'char *'
     83 | fz_buffer *fz_new_buffer_from_copied_data(fz_context *ctx, const unsigned char *data, size_t size);
        |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  fitz/fitz_wrap.c: In function 'JM_set_ocg_arrays':
  fitz/fitz_wrap.c:7912:40: warning: unused variable 'indobj' [-Wunused-variable]
   7912 |     pdf_obj *arr = NULL, *obj = NULL, *indobj = NULL;
        |                                        ^~~~~~
  fitz/fitz_wrap.c: At top level:
  fitz/fitz_wrap.c:8703:40: warning: 'struct Document' declared inside parameter list will not be visible outside of this definition or declaration
   8703 | SWIGINTERN void delete_Document(struct Document *self){
        |                                        ^~~~~~~~
  fitz/fitz_wrap.c: In function 'Document_load_page':
  fitz/fitz_wrap.c:8997:23: warning: unused variable 'val' [-Wunused-variable]
   8997 |             PyObject *val = NULL;
        |                       ^~~
  fitz/fitz_wrap.c: In function 'Document__embfile_add':
  fitz/fitz_wrap.c:9566:20: warning: variable 'size' set but not used [-Wunused-but-set-variable]
   9566 |             size_t size = 0;
        |                    ^~~~
  fitz/fitz_wrap.c:9565:17: warning: unused variable 'entry' [-Wunused-variable]
   9565 |             int entry = 0;
        |                 ^~~~~
  fitz/fitz_wrap.c: In function 'Document_next_location':
  fitz/fitz_wrap.c:9766:17: warning: unused variable 'page_n' [-Wunused-variable]
   9766 |             int page_n = -1;
        |                 ^~~~~~
  fitz/fitz_wrap.c: In function 'Document__getPDFfileid':
  fitz/fitz_wrap.c:10008:68: warning: pointer targets in passing argument 1 of 'JM_UnicodeFromStr' differ in signedness [-Wpointer-sign]
  10008 |                         LIST_APPEND_DROP(idlist, JM_UnicodeFromStr(hex));
        |                                                                    ^~~
        |                                                                    |
        |                                                                    unsigned char *
  fitz/fitz_wrap.c:3623:41: note: expected 'const char *' but argument is of type 'unsigned char *'
   3623 | PyObject *JM_UnicodeFromStr(const char *c)
        |                             ~~~~~~~~~~~~^
  fitz/fitz_wrap.c: At top level:
  fitz/fitz_wrap.c:10100:194: warning: 'struct Graftmap' declared inside parameter list will not be visible outside of this definition or declaration
  10100 | SWIGINTERN PyObject *Document_insert_pdf(struct Document *self,struct Document *docsrc,int from_page,int to_page,int start_at,int rotate,int links,int annots,int show_progress,int final,struct Graftmap *_gmap){
        |                                                                                                                                                                                                  ^~~~~~~~
  fitz/fitz_wrap.c: In function 'Document__get_char_widths':
  fitz/fitz_wrap.c:10224:36: warning: unused variable 'fb_font' [-Wunused-variable]
  10224 |             fz_font *font = NULL, *fb_font= NULL;
        |                                    ^~~~~~~
  fitz/fitz_wrap.c:10221:17: warning: unused variable 'lang' [-Wunused-variable]
  10221 |             int lang = 0;
        |                 ^~~~
  fitz/fitz_wrap.c:10220:17: warning: unused variable 'cwlen' [-Wunused-variable]
  10220 |             int cwlen = 0;
        |                 ^~~~~
  fitz/fitz_wrap.c: In function 'Document_extract_font':
  fitz/fitz_wrap.c:10370:24: warning: unused variable 'len' [-Wunused-variable]
  10370 |             Py_ssize_t len = 0;
        |                        ^~~
  fitz/fitz_wrap.c: In function 'Document_fullcopy_page':
  fitz/fitz_wrap.c:11018:69: warning: pointer targets in passing argument 2 of 'fz_new_buffer_from_copied_data' differ in signedness [-Wpointer-sign]
  11018 |                                fz_new_buffer_from_copied_data(gctx, "  ", 1), NULL, 0);
        |                                                                     ^~~~
        |                                                                     |
        |                                                                     char *
  In file included from /usr/local/include/mupdf/fitz/output.h:6,
                   from /usr/local/include/mupdf/fitz/hash.h:6,
                   from /usr/include/mupdf/fitz.h:16,
                   from fitz/fitz_wrap.c:2767:
  /usr/local/include/mupdf/fitz/buffer.h:83:12: note: expected 'const unsigned char *' but argument is of type 'char *'
     83 | fz_buffer *fz_new_buffer_from_copied_data(fz_context *ctx, const unsigned char *data, size_t size);
        |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  fitz/fitz_wrap.c:10977:22: warning: unused variable 'page2' [-Wunused-variable]
  10977 |             pdf_obj *page2 = NULL;
        |                      ^~~~~
  fitz/fitz_wrap.c: In function 'Document__move_copy_page':
  fitz/fitz_wrap.c:11054:26: warning: unused variable 'page2' [-Wunused-variable]
  11054 |                 pdf_obj *page2 = pdf_lookup_page_loc(gctx, pdf, nb, &parent2, &i2);
        |                          ^~~~~
  fitz/fitz_wrap.c: In function 'Document__get_page_labels':
  fitz/fitz_wrap.c:11185:24: warning: unused variable 'res' [-Wunused-variable]
  11185 |             fz_buffer *res = NULL;
        |                        ^~~
  fitz/fitz_wrap.c: In function 'Page_get_svg_image':
  fitz/fitz_wrap.c:11664:29: warning: unused variable 'seps' [-Wunused-variable]
  11664 |             fz_separations *seps = NULL;
        |                             ^~~~
  fitz/fitz_wrap.c: At top level:
  fitz/fitz_wrap.c:12179:104: warning: 'struct Colorspace' declared inside parameter list will not be visible outside of this definition or declaration
  12179 | SWIGINTERN struct Pixmap *Page__makePixmap(struct Page *self,struct Document *doc,PyObject *ctm,struct Colorspace *cs,int alpha,int annots,PyObject *clip){
        |                                                                                                        ^~~~~~~~~~
  fitz/fitz_wrap.c:12408:151: warning: 'struct Graftmap' declared inside parameter list will not be visible outside of this definition or declaration
  12408 | SWIGINTERN PyObject *Page__show_pdf_page(struct Page *self,struct Page *fz_srcpage,int overlay,PyObject *matrix,int xref,int oc,PyObject *clip,struct Graftmap *graftmap,char *_imgname){
        |                                                                                                                                                       ^~~~~~~~
  fitz/fitz_wrap.c: In function 'Page__insertImage':`

Attached are the minimalistic example files to reproduce the errors.

Any help would be highly appreciated.
requirements.txt
Dockerfile.txt

[tiangolo]

Hello, thanks for the patience. That's probably because you are trying to use Alpine, but you probably shouldn't. Alpine is no longer supported. As you are using a compiled extension, you should probably use the standard base image. You can read more about it here: https://github.com/tiangolo/uwsgi-nginx-flask-docker#-alpine-python-warning