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Diffstat (limited to 'archive-tar.c')
-rw-r--r--archive-tar.c107
1 files changed, 72 insertions, 35 deletions
diff --git a/archive-tar.c b/archive-tar.c
index 0d1e6bd754..380e3aedd2 100644
--- a/archive-tar.c
+++ b/archive-tar.c
@@ -18,6 +18,21 @@ static int tar_umask = 002;
static int write_tar_filter_archive(const struct archiver *ar,
struct archiver_args *args);
+/*
+ * This is the max value that a ustar size header can specify, as it is fixed
+ * at 11 octal digits. POSIX specifies that we switch to extended headers at
+ * this size.
+ *
+ * Likewise for the mtime (which happens to use a buffer of the same size).
+ */
+#if ULONG_MAX == 0xFFFFFFFF
+#define USTAR_MAX_SIZE ULONG_MAX
+#define USTAR_MAX_MTIME ULONG_MAX
+#else
+#define USTAR_MAX_SIZE 077777777777UL
+#define USTAR_MAX_MTIME 077777777777UL
+#endif
+
/* writes out the whole block, but only if it is full */
static void write_if_needed(void)
{
@@ -137,6 +152,20 @@ static void strbuf_append_ext_header(struct strbuf *sb, const char *keyword,
strbuf_addch(sb, '\n');
}
+/*
+ * Like strbuf_append_ext_header, but for numeric values.
+ */
+static void strbuf_append_ext_header_uint(struct strbuf *sb,
+ const char *keyword,
+ uintmax_t value)
+{
+ char buf[40]; /* big enough for 2^128 in decimal, plus NUL */
+ int len;
+
+ len = xsnprintf(buf, sizeof(buf), "%"PRIuMAX, value);
+ strbuf_append_ext_header(sb, keyword, buf, len);
+}
+
static unsigned int ustar_header_chksum(const struct ustar_header *header)
{
const unsigned char *p = (const unsigned char *)header;
@@ -167,37 +196,36 @@ static void prepare_header(struct archiver_args *args,
struct ustar_header *header,
unsigned int mode, unsigned long size)
{
- sprintf(header->mode, "%07o", mode & 07777);
- sprintf(header->size, "%011lo", S_ISREG(mode) ? size : 0);
- sprintf(header->mtime, "%011lo", (unsigned long) args->time);
+ xsnprintf(header->mode, sizeof(header->mode), "%07o", mode & 07777);
+ xsnprintf(header->size, sizeof(header->size), "%011lo", S_ISREG(mode) ? size : 0);
+ xsnprintf(header->mtime, sizeof(header->mtime), "%011lo", (unsigned long) args->time);
- sprintf(header->uid, "%07o", 0);
- sprintf(header->gid, "%07o", 0);
+ xsnprintf(header->uid, sizeof(header->uid), "%07o", 0);
+ xsnprintf(header->gid, sizeof(header->gid), "%07o", 0);
strlcpy(header->uname, "root", sizeof(header->uname));
strlcpy(header->gname, "root", sizeof(header->gname));
- sprintf(header->devmajor, "%07o", 0);
- sprintf(header->devminor, "%07o", 0);
+ xsnprintf(header->devmajor, sizeof(header->devmajor), "%07o", 0);
+ xsnprintf(header->devminor, sizeof(header->devminor), "%07o", 0);
memcpy(header->magic, "ustar", 6);
memcpy(header->version, "00", 2);
- sprintf(header->chksum, "%07o", ustar_header_chksum(header));
+ xsnprintf(header->chksum, sizeof(header->chksum), "%07o", ustar_header_chksum(header));
}
-static int write_extended_header(struct archiver_args *args,
- const unsigned char *sha1,
- const void *buffer, unsigned long size)
+static void write_extended_header(struct archiver_args *args,
+ const unsigned char *sha1,
+ const void *buffer, unsigned long size)
{
struct ustar_header header;
unsigned int mode;
memset(&header, 0, sizeof(header));
*header.typeflag = TYPEFLAG_EXT_HEADER;
mode = 0100666;
- sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1));
+ xsnprintf(header.name, sizeof(header.name), "%s.paxheader", sha1_to_hex(sha1));
prepare_header(args, &header, mode, size);
write_blocked(&header, sizeof(header));
write_blocked(buffer, size);
- return 0;
}
static int write_tar_entry(struct archiver_args *args,
@@ -208,7 +236,7 @@ static int write_tar_entry(struct archiver_args *args,
struct ustar_header header;
struct strbuf ext_header = STRBUF_INIT;
unsigned int old_mode = mode;
- unsigned long size;
+ unsigned long size, size_in_header;
void *buffer;
int err = 0;
@@ -233,10 +261,10 @@ static int write_tar_entry(struct archiver_args *args,
size_t rest = pathlen - plen - 1;
if (plen > 0 && rest <= sizeof(header.name)) {
memcpy(header.prefix, path, plen);
- memcpy(header.name, path + plen + 1, rest);
+ memcpy(header.name, path + plen + 1, rest);
} else {
- sprintf(header.name, "%s.data",
- sha1_to_hex(sha1));
+ xsnprintf(header.name, sizeof(header.name), "%s.data",
+ sha1_to_hex(sha1));
strbuf_append_ext_header(&ext_header, "path",
path, pathlen);
}
@@ -259,23 +287,25 @@ static int write_tar_entry(struct archiver_args *args,
if (S_ISLNK(mode)) {
if (size > sizeof(header.linkname)) {
- sprintf(header.linkname, "see %s.paxheader",
- sha1_to_hex(sha1));
+ xsnprintf(header.linkname, sizeof(header.linkname),
+ "see %s.paxheader", sha1_to_hex(sha1));
strbuf_append_ext_header(&ext_header, "linkpath",
buffer, size);
} else
memcpy(header.linkname, buffer, size);
}
- prepare_header(args, &header, mode, size);
+ size_in_header = size;
+ if (S_ISREG(mode) && size > USTAR_MAX_SIZE) {
+ size_in_header = 0;
+ strbuf_append_ext_header_uint(&ext_header, "size", size);
+ }
+
+ prepare_header(args, &header, mode, size_in_header);
if (ext_header.len > 0) {
- err = write_extended_header(args, sha1, ext_header.buf,
- ext_header.len);
- if (err) {
- free(buffer);
- return err;
- }
+ write_extended_header(args, sha1, ext_header.buf,
+ ext_header.len);
}
strbuf_release(&ext_header);
write_blocked(&header, sizeof(header));
@@ -289,24 +319,33 @@ static int write_tar_entry(struct archiver_args *args,
return err;
}
-static int write_global_extended_header(struct archiver_args *args)
+static void write_global_extended_header(struct archiver_args *args)
{
const unsigned char *sha1 = args->commit_sha1;
struct strbuf ext_header = STRBUF_INIT;
struct ustar_header header;
unsigned int mode;
- int err = 0;
- strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40);
+ if (sha1)
+ strbuf_append_ext_header(&ext_header, "comment",
+ sha1_to_hex(sha1), 40);
+ if (args->time > USTAR_MAX_MTIME) {
+ strbuf_append_ext_header_uint(&ext_header, "mtime",
+ args->time);
+ args->time = USTAR_MAX_MTIME;
+ }
+
+ if (!ext_header.len)
+ return;
+
memset(&header, 0, sizeof(header));
*header.typeflag = TYPEFLAG_GLOBAL_HEADER;
mode = 0100666;
- strcpy(header.name, "pax_global_header");
+ xsnprintf(header.name, sizeof(header.name), "pax_global_header");
prepare_header(args, &header, mode, ext_header.len);
write_blocked(&header, sizeof(header));
write_blocked(ext_header.buf, ext_header.len);
strbuf_release(&ext_header);
- return err;
}
static struct archiver **tar_filters;
@@ -382,10 +421,8 @@ static int write_tar_archive(const struct archiver *ar,
{
int err = 0;
- if (args->commit_sha1)
- err = write_global_extended_header(args);
- if (!err)
- err = write_archive_entries(args, write_tar_entry);
+ write_global_extended_header(args);
+ err = write_archive_entries(args, write_tar_entry);
if (!err)
write_trailer();
return err;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-18 04:19:57 +0000