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Annotation of researchv10no/cmd/dist/lib/tryperm.c, revision 1.1

1.1     ! root        1: #define _POSIX_SOURCE
        !             2: #include <ctype.h>
        !             3: #include <stddef.h>
        !             4: #include <stdlib.h>
        !             5: #include <stdio.h>
        !             6: #include <string.h>
        !             7: #include <sys/types.h>
        !             8: #include <sys/stat.h>
        !             9: #include <fcntl.h>
        !            10: #include <unistd.h>
        !            11: #include "lib.h"
        !            12: 
        !            13: /*
        !            14:  * determine if we can recursively create the given pathname.  not a
        !            15:  * generally useful function since it destroys the pathname.
        !            16:  */
        !            17: static int
        !            18: cancreate(char *path, int recurse)
        !            19: {
        !            20:        char *slash;
        !            21: 
        !            22:        for (;;) {
        !            23:                slash = strrchr(path, '/');
        !            24:                if (! slash)
        !            25:                        return 0;       /* absolute pathnames only */
        !            26:                *slash = '\0';
        !            27:                if (!*path)
        !            28:                        break;
        !            29:                if (access(path, W_OK) == 0)
        !            30:                        return 1;
        !            31:                if (!recurse)
        !            32:                        return 0;
        !            33:                if (access(path, F_OK) == 0)
        !            34:                        return 0;
        !            35:        }
        !            36:        return access("/", W_OK) == 0;
        !            37: }
        !            38:                
        !            39: /*
        !            40:  * try the instructions of the package on the given fd against the
        !            41:  * permissions currently in the file system.  return 1 if we think we
        !            42:  * ought to go ahead and try inspkg.
        !            43:  * the right place to put this guy would be in the tarf command;
        !            44:  * then eventually we could remove all tarfile support from dist
        !            45:  * proper when (if?) most systems have adequate tar commands.
        !            46:  */
        !            47: int
        !            48: tryperm(int fd)
        !            49: {
        !            50:        return 1;
        !            51: }

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