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tail: with -f, use polling when a file is on an FS of unknown type

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Before, we would use inotify in that case, which would work as long
as updates were taking place locally, but not at all when remote.
Move hard-coded list of known remote FS types into a more
maintainable table in stat.c, alongside the list of FS
names and magic numbers.  Generate a new is_local_fs_type function.
* src/Makefile.am (fs-is-local.h): New rule, generated file.
* src/extract-magic: Revamp to parse local/remote keyword after
each magic number in src/stat.c's case statements.
Accept new --local option.
* src/.gitignore: Ignore the generated fs-is-local.h.
* src/tail.c [HAVE_INOTIFY]: Include fs-is-local.h.
(fremote) [HAVE_INOTIFY]: Use the new function in place of
the switch stmt with hard-coded list of FS types.
Emit a warning when processing a file on a file system of unknown type.
* NEWS (Changes in behavior): Mention it.
Suggested by Sven Breuner.
This commit is contained in:
Jim Meyering
2011-12-22 23:23:02 +01:00
parent 6e3299fcdb
commit 9c54c0a1d0
6 changed files with 150 additions and 109 deletions
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NEWS
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@@ -32,6 +32,13 @@ GNU coreutils NEWS -*- outline -*-
[you might say this was introduced in coreutils-7.5, along with inotify
support, but the new magic numbers weren't in the usual places then.]
** Changes in behavior
tail -f now uses polling (not inotify) when any of its file arguments
resides on a file system of unknown type. In addition, for each such
argument, tail -f prints a warning with the FS type magic number and a
request to report it to the bug-reporting address.
* Noteworthy changes in release 8.14 (2011-10-12) [stable]