-/* POSIX extended and STAR headers.
+/* POSIX extended headers for tar.
- Copyright (C) 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
#define obstack_chunk_free free
#include <obstack.h>
+bool xheader_protected_pattern_p (const char *pattern);
+bool xheader_protected_keyword_p (const char *keyword);
+
+/* Number of the global headers written so far. Not used yet */
+static size_t global_header_count;
+
+\f
+/* Keyword options */
+
+struct keyword_list
+{
+ struct keyword_list *next;
+ char *pattern;
+ char *value;
+};
+
+
+/* List of keyword patterns set by delete= option */
+static struct keyword_list *keyword_pattern_list;
+/* List of keyword/value pairs set by `keyword=value' option */
+static struct keyword_list *keyword_global_override_list;
+/* List of keyword/value pairs set by `keyword:=value' option */
+static struct keyword_list *keyword_override_list;
+/* Template for the name field of an 'x' type header */
+static char *exthdr_name;
+/* Template for the name field of a 'g' type header */
+static char *globexthdr_name;
+
+bool
+xheader_keyword_deleted_p (const char *kw)
+{
+ struct keyword_list *kp;
+
+ for (kp = keyword_pattern_list; kp; kp = kp->next)
+ if (fnmatch (kp->pattern, kw, 0) == 0)
+ return true;
+ return false;
+}
+
+bool
+xheader_keyword_override_p (const char *keyword)
+{
+ struct keyword_list *kp;
+
+ for (kp = keyword_override_list; kp; kp = kp->next)
+ if (strcmp (kp->pattern, keyword) == 0)
+ return true;
+ return false;
+}
+
+void
+xheader_list_append (struct keyword_list **root, char *kw, char *value)
+{
+ struct keyword_list *kp = xmalloc (sizeof *kp);
+ kp->pattern = xstrdup (kw);
+ kp->value = value ? xstrdup (value) : NULL;
+ kp->next = *root;
+ *root = kp;
+}
+
+void
+xheader_set_single_keyword (char *kw)
+{
+ USAGE_ERROR ((0, 0, "Keyword %s is unknown or not yet imlemented", kw));
+}
+
+void
+xheader_set_keyword_equal (char *kw, char *eq)
+{
+ bool global = true;
+ char *p = eq;
+
+ if (eq[-1] == ':')
+ {
+ p--;
+ global = false;
+ }
+
+ while (p > kw && isspace (*p))
+ p--;
+
+ *p = 0;
+
+ for (p = eq + 1; *p && isspace (*p); p++)
+ ;
+
+ if (strcmp (kw, "delete") == 0)
+ {
+ if (xheader_protected_pattern_p (p))
+ USAGE_ERROR ((0, 0, "Pattern %s cannot be used", p));
+ xheader_list_append (&keyword_pattern_list, p, NULL);
+ }
+ else if (strcmp (kw, "exthdr.name") == 0)
+ assign_string (&exthdr_name, p);
+ else if (strcmp (kw, "globexthdr.name") == 0)
+ assign_string (&globexthdr_name, p);
+ else
+ {
+ if (xheader_protected_keyword_p (kw))
+ USAGE_ERROR ((0, 0, "Keyword %s cannot be overridden", kw));
+ if (global)
+ xheader_list_append (&keyword_global_override_list, kw, p);
+ else
+ xheader_list_append (&keyword_override_list, kw, p);
+ }
+}
+
+void
+xheader_set_option (char *string)
+{
+ char *token;
+ for (token = strtok (string, ","); token; token = strtok (NULL, ","))
+ {
+ char *p = strchr (token, '=');
+ if (!p)
+ xheader_set_single_keyword (token);
+ else
+ xheader_set_keyword_equal (token, p);
+ }
+}
+
+/*
+ string Includes: Replaced By:
+ %d The directory name of the file,
+ equivalent to the result of the
+ dirname utility on the translated
+ pathname.
+ %f The filename of the file, equivalent
+ to the result of the basename
+ utility on the translated pathname.
+ %p The process ID of the pax process.
+ %% A '%' character. */
+
+static char *
+xheader_format_name (struct tar_stat_info *st, const char *fmt, bool allow_n)
+{
+ char *buf;
+ size_t len = strlen (fmt);
+ char *q;
+ const char *p;
+ char *dirname = NULL;
+ char *basename = NULL;
+ char pidbuf[64];
+ char nbuf[64];
+
+ for (p = exthdr_name; *p && (p = strchr (p, '%')); )
+ {
+ switch (p[1])
+ {
+ case '%':
+ len--;
+ break;
+
+ case 'd':
+ dirname = safer_name_suffix (dir_name (st->orig_file_name), false);
+ len += strlen (dirname) - 1;
+ break;
+
+ case 'f':
+ basename = base_name (st->orig_file_name);
+ len += strlen (basename) - 1;
+ break;
+
+ case 'p':
+ snprintf (pidbuf, sizeof pidbuf, "%lu",
+ (unsigned long) getpid ());
+ len += strlen (pidbuf) - 1;
+ break;
+
+ case 'n':
+ if (allow_n)
+ {
+ snprintf (nbuf, sizeof nbuf, "%lu",
+ (unsigned long) global_header_count + 1);
+ len += strlen (nbuf) - 1;
+ }
+ break;
+ }
+ p++;
+ }
+
+ buf = xmalloc (len + 1);
+ for (q = buf, p = fmt; *p; )
+ {
+ if (*p == '%')
+ {
+ switch (p[1])
+ {
+ case '%':
+ *q++ = *p++;
+ p++;
+ break;
+
+ case 'd':
+ q = stpcpy (q, dirname);
+ p += 2;
+ break;
+
+ case 'f':
+ q = stpcpy (q, basename);
+ p += 2;
+ break;
+
+ case 'p':
+ q = stpcpy (q, pidbuf);
+ p += 2;
+ break;
+
+ case 'n':
+ if (allow_n)
+ {
+ q = stpcpy (q, nbuf);
+ p += 2;
+ }
+ /* else fall through */
+
+ default:
+ *q++ = *p++;
+ if (*p)
+ *q++ = *p++;
+ }
+ }
+ else
+ *q++ = *p++;
+ }
+
+ /* Do not allow it to end in a slash */
+ while (q > buf && ISSLASH (q[-1]))
+ q--;
+ *q = 0;
+ return buf;
+}
+
+char *
+xheader_xhdr_name (struct tar_stat_info *st)
+{
+ /* FIXME: POSIX requires the default name to be '%d/PaxHeaders.%p/%f' */
+ if (!exthdr_name)
+ return xstrdup ("././@PaxHeader");
+ return xheader_format_name (st, exthdr_name, false);
+}
+
+#define GLOBAL_HEADER_TEMPLATE "/GlobalHead.%p.%n"
+
+char *
+xheader_ghdr_name (struct tar_stat_info *st)
+{
+ if (!globexthdr_name)
+ {
+ size_t len;
+ const char *tmp = getenv ("TMPDIR");
+ if (!tmp)
+ tmp = "/tmp";
+ len = strlen (tmp) + sizeof (GLOBAL_HEADER_TEMPLATE); /* Includes nul */
+ globexthdr_name = xmalloc (len);
+ strcpy(globexthdr_name, tmp);
+ strcat(globexthdr_name, GLOBAL_HEADER_TEMPLATE);
+ }
+
+ return xheader_format_name (st, globexthdr_name, true);
+}
+
+\f
/* General Interface */
+/* Used by xheader_finish() */
+static void code_string (char const *string, char const *keyword,
+ struct xheader *xhdr);
+
struct xhdr_tab
{
char const *keyword;
void (*coder) (struct tar_stat_info const *, char const *,
struct xheader *, void *data);
void (*decoder) (struct tar_stat_info *, char const *);
+ bool protect;
};
/* This declaration must be extern, because ISO C99 section 6.9.2
return NULL;
}
+bool
+xheader_protected_pattern_p (const char *pattern)
+{
+ struct xhdr_tab const *p;
+
+ for (p = xhdr_tab; p->keyword; p++)
+ if (p->protect && fnmatch (pattern, p->keyword, 0) == 0)
+ return true;
+ return false;
+}
+
+bool
+xheader_protected_keyword_p (const char *keyword)
+{
+ struct xhdr_tab const *p;
+
+ for (p = xhdr_tab; p->keyword; p++)
+ if (p->protect && strcmp (p->keyword, keyword) == 0)
+ return true;
+ return false;
+}
+
/* Decodes a single extended header record. Advances P to the next
record.
Returns true on success, false otherwise. */
len = strtoul (*p, p, 10);
if (**p != ' ')
{
- ERROR ((0, 0, _("Malformed extended header: missing whitespace after the length")));
+ ERROR ((0, 0,
+ _("Malformed extended header: missing whitespace after the length")));
return false;
}
eqp = *p;
**p = 0;
+
+ if (xheader_keyword_deleted_p (keyword)
+ || xheader_keyword_override_p (keyword))
+ return true;
t = locate_handler (keyword);
if (t)
{
return true;
}
+static void
+run_override_list (struct keyword_list *kp, struct tar_stat_info *st)
+{
+ for (; kp; kp = kp->next)
+ {
+ struct xhdr_tab const *t = locate_handler (kp->pattern);
+ if (t)
+ t->decoder (st, kp->value);
+ }
+}
+
void
xheader_decode (struct tar_stat_info *st)
{
char *p = extended_header.buffer + BLOCKSIZE;
char *endp = &extended_header.buffer[extended_header.size-1];
+ run_override_list (keyword_global_override_list, st);
+
while (p < endp)
if (!decode_record (&p, st))
break;
+
+ run_override_list (keyword_override_list, st);
}
void
xheader_store (char const *keyword, struct tar_stat_info const *st, void *data)
{
struct xhdr_tab const *t;
-
+ char *value;
+
if (extended_header.buffer)
return;
t = locate_handler (keyword);
if (!t)
return;
+ if (xheader_keyword_deleted_p (keyword)
+ || xheader_keyword_override_p (keyword))
+ return;
if (!extended_header.stk)
{
extended_header.stk = xmalloc (sizeof *extended_header.stk);
void
xheader_finish (struct xheader *xhdr)
{
+ struct keyword_list *kp;
+
+ for (kp = keyword_override_list; kp; kp = kp->next)
+ code_string (kp->value, kp->pattern, xhdr);
+
obstack_1grow (xhdr->stk, 0);
xhdr->buffer = obstack_finish (xhdr->stk);
xhdr->size = strlen (xhdr->buffer);
{ "uname", uname_coder, uname_decoder },
/* Sparse file handling */
- { "GNU.sparse.size", sparse_size_coder, sparse_size_decoder },
- { "GNU.sparse.numblocks", sparse_numblocks_coder, sparse_numblocks_decoder },
- { "GNU.sparse.offset", sparse_offset_coder, sparse_offset_decoder },
- { "GNU.sparse.numbytes", sparse_numbytes_coder, sparse_numbytes_decoder },
+ { "GNU.sparse.size", sparse_size_coder, sparse_size_decoder, true },
+ { "GNU.sparse.numblocks", sparse_numblocks_coder, sparse_numblocks_decoder,
+ true },
+ { "GNU.sparse.offset", sparse_offset_coder, sparse_offset_decoder,
+ true },
+ { "GNU.sparse.numbytes", sparse_numbytes_coder, sparse_numbytes_decoder,
+ true },
#if 0 /* GNU private keywords (not yet implemented) */
projects / chaz / tar / commitdiff
