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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-12-23 13:41:58 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-12-23 13:55:38 +0100
commitb4e5a24a3031c83ca51b50d34dea1a05aedf7b44 (patch)
tree72c75fc2a0928963c1958900e387bc6c2e01971b /lib/tar
parentf92e31c94f953a68309dab7df75f5f9cc67caa7a (diff)
Add libtar.a function to create hardlink records
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/tar')
-rw-r--r--lib/tar/write_header.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/lib/tar/write_header.c b/lib/tar/write_header.c
index acce280..cd65f59 100644
--- a/lib/tar/write_header.c
+++ b/lib/tar/write_header.c
@@ -215,3 +215,53 @@ out_skip:
fprintf(stderr, "WARNING: %s: %s\n", name, reason);
return 1;
}
+
+int write_hard_link(FILE *fp, const struct stat *sb, const char *name,
+ const char *target, unsigned int counter)
+{
+ tar_header_t hdr;
+ char buffer[64];
+ size_t len;
+
+ memset(&hdr, 0, sizeof(hdr));
+
+ len = strlen(target);
+ if (len >= 100) {
+ sprintf(buffer, "gnu/target%u", counter);
+ if (write_gnu_header(fp, sb, target, len,
+ TAR_TYPE_GNU_SLINK, buffer))
+ return -1;
+ sprintf(hdr.linkname, "hardlink_%u", counter);
+ } else {
+ memcpy(hdr.linkname, target, len);
+ }
+
+ len = strlen(name);
+ if (len >= 100) {
+ sprintf(buffer, "gnu/name%u", counter);
+ if (write_gnu_header(fp, sb, name, len,
+ TAR_TYPE_GNU_PATH, buffer)) {
+ return -1;
+ }
+ sprintf(hdr.name, "gnu/data%u", counter);
+ } else {
+ memcpy(hdr.name, name, len);
+ }
+
+ write_number(hdr.mode, sb->st_mode & ~S_IFMT, sizeof(hdr.mode));
+ write_number(hdr.uid, sb->st_uid, sizeof(hdr.uid));
+ write_number(hdr.gid, sb->st_gid, sizeof(hdr.gid));
+ write_number(hdr.size, 0, sizeof(hdr.size));
+ write_number_signed(hdr.mtime, sb->st_mtime, sizeof(hdr.mtime));
+ hdr.typeflag = TAR_TYPE_LINK;
+ memcpy(hdr.magic, TAR_MAGIC_OLD, sizeof(hdr.magic));
+ memcpy(hdr.version, TAR_VERSION_OLD, sizeof(hdr.version));
+ sprintf(hdr.uname, "%u", sb->st_uid);
+ sprintf(hdr.gname, "%u", sb->st_gid);
+ write_number(hdr.devmajor, 0, sizeof(hdr.devmajor));
+ write_number(hdr.devminor, 0, sizeof(hdr.devminor));
+
+ update_checksum(&hdr);
+ return write_retry("writing tar hard link record",
+ fp, &hdr, sizeof(hdr));
+}