2: #include <petscsys.h>
  3: #if defined(PETSC_HAVE_PWD_H)
  4: #include <pwd.h>
  5: #endif
  6: #include <ctype.h>
  7: #include <sys/types.h>
  8: #include <sys/stat.h>
  9: #if defined(PETSC_HAVE_UNISTD_H)
 10: #include <unistd.h>
 11: #endif
 12: #if defined(PETSC_HAVE_STDLIB_H)
 13: #include <stdlib.h>
 14: #endif
 15: #if defined(PETSC_HAVE_SYS_UTSNAME_H)
 16: #include <sys/utsname.h>
 17: #endif
 18: #if defined(PETSC_HAVE_SYS_SYSTEMINFO_H)
 19: #include <sys/systeminfo.h>
 20: #endif

 24: /*@C
 25:    PetscGetRealPath - Get the path without symbolic links etc. and in absolute form.

 27:    Not Collective

 29:    Input Parameter:
 30: .  path - path to resolve

 32:    Output Parameter:
 33: .  rpath - resolved path

 35:    Level: developer

 37:    Notes: 
 38:    rpath is assumed to be of length PETSC_MAX_PATH_LEN.

 40:    Systems that use the automounter often generate absolute paths
 41:    of the form "/tmp_mnt....".  However, the automounter will fail to
 42:    mount this path if it is not already mounted, so we remove this from
 43:    the head of the line.  This may cause problems if, for some reason,
 44:    /tmp_mnt is valid and not the result of the automounter.

 46:    Concepts: real path
 47:    Concepts: path^real

 49: .seealso: PetscGetFullPath()
 50: @*/
 51: PetscErrorCode  PetscGetRealPath(const char path[],char rpath[])
 52: {
 54:   char           tmp3[PETSC_MAX_PATH_LEN];
 55:   PetscBool      flg;
 56: #if !defined(PETSC_HAVE_REALPATH) && defined(PETSC_HAVE_READLINK)
 57:   char           tmp1[PETSC_MAX_PATH_LEN],tmp4[PETSC_MAX_PATH_LEN],*tmp2;
 58:   size_t         N,len,len1,len2;
 59:   int            n,m;
 60: #endif

 63: #if defined(PETSC_HAVE_REALPATH)
 64:   if (!realpath(path,rpath)) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_LIB,"realpath()");
 65: #elif defined(PETSC_HAVE_READLINK)
 66:   /* Algorithm: we move through the path, replacing links with the real paths.   */
 67:   PetscStrcpy(rpath,path);
 68:   PetscStrlen(rpath,&N);
 69:   while (N) {
 70:     PetscStrncpy(tmp1,rpath,N);
 71:     tmp1[N] = 0;
 72:     n = readlink(tmp1,tmp3,PETSC_MAX_PATH_LEN);
 73:     if (n > 0) {
 74:       tmp3[n] = 0; /* readlink does not automatically add 0 to string end */
 75:       if (tmp3[0] != '/') {
 76:         PetscStrchr(tmp1,'/',&tmp2);
 77:         PetscStrlen(tmp1,&len1);
 78:         PetscStrlen(tmp2,&len2);
 79:         m    = len1 - len2;
 80:         PetscStrncpy(tmp4,tmp1,m);
 81:         tmp4[m] = 0;
 82:         PetscStrlen(tmp4,&len);
 83:         PetscStrncat(tmp4,"/",PETSC_MAX_PATH_LEN - len);
 84:         PetscStrlen(tmp4,&len);
 85:         PetscStrncat(tmp4,tmp3,PETSC_MAX_PATH_LEN - len);
 86:         PetscGetRealPath(tmp4,rpath);
 87:         PetscStrlen(rpath,&len);
 88:         PetscStrncat(rpath,path+N,PETSC_MAX_PATH_LEN - len);
 89:       } else {
 90:         PetscGetRealPath(tmp3,tmp1);
 91:         PetscStrncpy(rpath,tmp1,PETSC_MAX_PATH_LEN);
 92:         PetscStrlen(rpath,&len);
 93:         PetscStrncat(rpath,path+N,PETSC_MAX_PATH_LEN - len);
 94:       }
 95:       return(0);
 96:     }
 97:     PetscStrchr(tmp1,'/',&tmp2);
 98:     if (tmp2) {
 99:       PetscStrlen(tmp1,&len1);
100:       PetscStrlen(tmp2,&len2);
101:       N    = len1 - len2;
102:     } else {
103:       PetscStrlen(tmp1,&N);
104:     }
105:   }
106:   PetscStrncpy(rpath,path,PETSC_MAX_PATH_LEN);
107: #else /* Just punt */
108:   PetscStrcpy(rpath,path);
109: #endif

111:   /* remove garbage some automounters put at the beginning of the path */
112:   PetscStrncmp("/tmp_mnt/",rpath,9,&flg);
113:   if (flg) {
114:     PetscStrcpy(tmp3,rpath + 8);
115:     PetscStrcpy(rpath,tmp3);
116:   }
117:   return(0);
118: }