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tar: use ctime, not mtime, when checking placeholders

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* src/extract.c (struct delayed_link): Rename member mtime to ctime.
All uses changed to use ctime rather than mtime.
This commit is contained in:
Paul Eggert
2010-08-24 15:44:10 -07:00
parent fbcadc9592
commit 57b11473b0
1 changed files with 7 additions and 5 deletions
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12
src/extract.c
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@@ -80,10 +80,12 @@ struct delayed_link
/* The next delayed link in the list. */
struct delayed_link *next;
/* The device, inode number and last-modified time of the placeholder. */
/* The device, inode number and ctime of the placeholder. Use
ctime, not mtime, to make false matches less likely if some
other process removes the placeholder. */
dev_t dev;
ino_t ino;
struct timespec mtime;
struct timespec ctime;
/* True if the link is symbolic. */
bool is_symlink;
@@ -924,7 +926,7 @@ create_placeholder_file (char *file_name, bool is_symlink, bool *interdir_made)
delayed_link_head = p;
p->dev = st.st_dev;
p->ino = st.st_ino;
p->mtime = get_stat_mtime (&st);
p->ctime = get_stat_ctime (&st);
p->is_symlink = is_symlink;
if (is_symlink)
{
@@ -990,7 +992,7 @@ extract_link (char *file_name, int typeflag)
for (; ds; ds = ds->next)
if (ds->dev == st1.st_dev
&& ds->ino == st1.st_ino
&& timespec_cmp (ds->mtime, get_stat_mtime (&st1)) == 0)
&& timespec_cmp (ds->ctime, get_stat_ctime (&st1)) == 0)
{
struct string_list *p = xmalloc (offsetof (struct string_list, string)
+ strlen (file_name) + 1);
@@ -1347,7 +1349,7 @@ apply_delayed_links (void)
if (lstat (source, &st) == 0
&& st.st_dev == ds->dev
&& st.st_ino == ds->ino
&& timespec_cmp (get_stat_mtime (&st), ds->mtime) == 0)
&& timespec_cmp (get_stat_ctime (&st), ds->ctime) == 0)
{
/* Unlink the placeholder, then create a hard link if possible,
a symbolic link otherwise. */