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91 lines
3.5 KiB
91 lines
3.5 KiB
diff --git a/gnu/stat-time.h b/gnu/stat-time.h |
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index 1dc4098..7b8428e 100644 |
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--- a/gnu/stat-time.h |
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+++ b/gnu/stat-time.h |
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@@ -144,7 +144,7 @@ get_stat_mtime (struct stat const *st) |
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} |
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/* Return *ST's birth time, if available; otherwise return a value |
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- with negative tv_nsec. */ |
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+ with tv_sec and tv_nsec both equal to -1. */ |
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static inline struct timespec |
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get_stat_birthtime (struct stat const *st) |
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{ |
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@@ -163,7 +163,7 @@ get_stat_birthtime (struct stat const *st) |
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t.tv_sec = st->st_ctime; |
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t.tv_nsec = 0; |
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#else |
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- /* Birth time is not supported. Set tv_sec to avoid undefined behavior. */ |
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+ /* Birth time is not supported. */ |
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t.tv_sec = -1; |
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t.tv_nsec = -1; |
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/* Avoid a "parameter unused" warning. */ |
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@@ -177,10 +177,12 @@ get_stat_birthtime (struct stat const *st) |
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using zero. Attempt to work around this problem. Alas, this can |
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report failure even for valid time stamps. Also, NetBSD |
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sometimes returns junk in the birth time fields; work around this |
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- bug if it it is detected. There's no need to detect negative |
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- tv_nsec junk as negative tv_nsec already indicates an error. */ |
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- if (t.tv_sec == 0 || 1000000000 <= t.tv_nsec) |
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- t.tv_nsec = -1; |
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+ bug if it is detected. */ |
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+ if (! (t.tv_sec && 0 <= t.tv_nsec && t.tv_nsec < 1000000000)) |
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+ { |
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+ t.tv_sec = -1; |
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+ t.tv_nsec = -1; |
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+ } |
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#endif |
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return t; |
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diff --git a/src/extract.c b/src/extract.c |
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index 340beea..3afb95d 100644 |
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--- a/src/extract.c |
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+++ b/src/extract.c |
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@@ -119,12 +119,15 @@ struct delayed_link |
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/* The next delayed link in the list. */ |
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struct delayed_link *next; |
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- /* The device, inode number and ctime of the placeholder. Use |
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- ctime, not mtime, to make false matches less likely if some |
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- other process removes the placeholder. */ |
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+ /* The device, inode number and birthtime of the placeholder. |
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+ birthtime.tv_nsec is negative if the birthtime is not available. |
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+ Don't use mtime as this would allow for false matches if some |
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+ other process removes the placeholder. Don't use ctime as |
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+ this would cause race conditions and other screwups, e.g., |
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+ when restoring hard-linked symlinks. */ |
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dev_t dev; |
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ino_t ino; |
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- struct timespec ctime; |
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+ struct timespec birthtime; |
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/* True if the link is symbolic. */ |
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bool is_symlink; |
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@@ -1200,7 +1203,7 @@ create_placeholder_file (char *file_name, bool is_symlink, bool *interdir_made) |
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delayed_link_head = p; |
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p->dev = st.st_dev; |
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p->ino = st.st_ino; |
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- p->ctime = get_stat_ctime (&st); |
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+ p->birthtime = get_stat_birthtime (&st); |
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p->is_symlink = is_symlink; |
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if (is_symlink) |
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{ |
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@@ -1265,7 +1268,8 @@ extract_link (char *file_name, int typeflag) |
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if (ds->change_dir == chdir_current |
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&& ds->dev == st1.st_dev |
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&& ds->ino == st1.st_ino |
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- && timespec_cmp (ds->ctime, get_stat_ctime (&st1)) == 0) |
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+ && (timespec_cmp (ds->birthtime, get_stat_birthtime (&st1)) |
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+ == 0)) |
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{ |
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struct string_list *p = xmalloc (offsetof (struct string_list, string) |
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+ strlen (file_name) + 1); |
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@@ -1638,7 +1642,7 @@ apply_delayed_links (void) |
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if (fstatat (chdir_fd, source, &st, AT_SYMLINK_NOFOLLOW) == 0 |
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&& st.st_dev == ds->dev |
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&& st.st_ino == ds->ino |
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- && timespec_cmp (get_stat_ctime (&st), ds->ctime) == 0) |
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+ && timespec_cmp (get_stat_birthtime (&st), ds->birthtime) == 0) |
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{ |
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/* Unlink the placeholder, then create a hard link if possible, |
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a symbolic link otherwise. */
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