bug#61326: Adding --no-add-suffix to zip patch

[Ruijie Yu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

On Feb 7, 2023, at 02:58, Adam Sjøgren via Bug reports for GNU Emacs, the Swiss army knife of text editors <bug-gnu-emacs@gnu.org> wrote:
> 
> Adding a '--no-add-suffix' option to zip 3.0 is not too bad:
> 
> diff -u orig/zip-3.0/globals.c chan/zip-3.0/globals.c
> --- orig/zip-3.0/globals.c    2008-05-25 19:26:38.000000000 +0200
> +++ chan/zip-3.0/globals.c    2023-02-06 19:42:48.000000000 +0100
> @@ -106,6 +106,7 @@
> int noisy = 1;                /* 0=quiet operation */
> int extra_fields = 1;         /* 0=create minimum, 1=don't copy old, 2=keep old */
> int use_descriptors = 0;      /* 1=use data descriptors 12/29/04 */
> +int no_add_suffix = 0;        /* 1=do not add suffix .zip to archive names without . */
> int zip_to_stdout = 0;        /* output zipfile to stdout 12/30/04 */
> int allow_empty_archive = 0;  /* if no files, create empty archive anyway 12/28/05 */
> int copy_only = 0;            /* 1=copying archive entries only */
> diff -u orig/zip-3.0/zip.c chan/zip-3.0/zip.c
> --- orig/zip-3.0/zip.c    2023-02-06 19:49:42.000000000 +0100
> +++ chan/zip-3.0/zip.c    2023-02-06 19:47:26.000000000 +0100
> @@ -1942,6 +1942,7 @@
> #ifdef UNICODE_TEST
> #define o_sC            0x146
> #endif
> +#define o_nas           0x147
> 
> 
> /* the below is mainly from the old main command line
> @@ -2042,6 +2043,7 @@
>     {"N",  "notes",       o_NO_VALUE,       o_NOT_NEGATABLE, 'N',  "add notes as entry comments"},
> #endif
>     {"o",  "latest-time", o_NO_VALUE,       o_NOT_NEGATABLE, 'o',  "use latest entry time as archive time"},
> +    {"",   "no-add-suffix", o_NO_VALUE,     o_NOT_NEGATABLE, o_nas, "do not add .zip suffix to archive name without ."},
>     {"O",  "output-file", o_REQUIRED_VALUE, o_NOT_NEGATABLE, 'O',  "set out zipfile different than in zipfile"},
>     {"p",  "paths",       o_NO_VALUE,       o_NOT_NEGATABLE, 'p',  "store paths"},
>     {"P",  "password",    o_REQUIRED_VALUE, o_NOT_NEGATABLE, 'P',  "encrypt entries, option value is password"},
> @@ -2378,6 +2380,7 @@
>   before = 0;             /* 0=ignore, else exclude files before this time */
>   after = 0;              /* 0=ignore, else exclude files newer than this time */
> 
> +  no_add_suffix = 0       /* 0=add .zip if no . as usual, else use archive name unchanged */
>   special = ".Z:.zip:.zoo:.arc:.lzh:.arj"; /* List of special suffixes */
>   key = NULL;             /* Scramble password if scrambling */
>   key_needed = 0;         /* Need scramble password */
> @@ -3299,6 +3302,11 @@
>           break;
> #endif
> 
> +        case o_nas:
> +          no_add_suffix = 1;
> +          break;
> +
> +
>         case o_NON_OPTION_ARG:
>           /* not an option */
>           /* no more options as permuting */
> @@ -3340,8 +3348,14 @@
> #endif /* !MACOS && !WINDLL */
>               {
>                 /* name of zipfile */
> -                if ((zipfile = ziptyp(value)) == NULL) {
> -                  ZIPERR(ZE_MEM, "was processing arguments");
> +                if (no_add_suffix) {
> +                  zipfile = value;
> +                }
> +                else {
> +                  if ((zipfile = ziptyp(value)) == NULL) {
> +                    ZIPERR(ZE_MEM, "was processing arguments");
> +                  }
> +                  free(value);
>                 }
>                 /* read zipfile if exists */
>                 /*
> @@ -3349,7 +3363,6 @@
>                   ZIPERR(r, zipfile);
>                 }
>                 */
> -                free(value);
>               }
>               if (show_what_doing) {
>                 fprintf(mesg, "sd: Zipfile name '%s'\n", zipfile);
> diff -u orig/zip-3.0/zip.h chan/zip-3.0/zip.h
> --- orig/zip-3.0/zip.h    2008-05-25 19:23:22.000000000 +0200
> +++ chan/zip-3.0/zip.h    2023-02-06 19:43:41.000000000 +0100
> @@ -442,6 +442,7 @@
>  extern int use_privileges;     /* use security privilege overrides */
> #endif
> extern int use_descriptors;     /* use data descriptors (extended headings) */
> +extern int no_add_suffix;       /* do not add suffix .zip to archive names without . */
> extern int allow_empty_archive; /* if no files, create empty archive anyway */
> extern int copy_only;           /* 1 = copy archive with no changes */
> extern int zip_to_stdout;       /* output to stdout */
> 
> But getting something like that accepted and distributed, and for Emacs
> to tell whether the installed zip has that option or not, seems like a
> lot of work.

Maybe, at least in the meantime, we change it such that all write operations for zip create files in temp, and move to / overwrite the original file when done? Although I don’t have a full understanding on how that would be done and whether there are problems along with it.