tUpdate README - wendy - watch files/directories and run commands on any event
(HTM) git clone git://z3bra.org/wendy
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---
(DIR) commit 8d31be2785ab140a087843c2a125e30a7727376d
(DIR) parent a2cde2182b52311df842a36c13fddbc6e416df07
(HTM) Author: Willy Goiffon <dev@z3bra.org>
Date: Thu, 30 Apr 2020 10:59:58 +0200
Update README
Diffstat:
M README | 63 +++++++++++--------------------
1 file changed, 23 insertions(+), 40 deletions(-)
---
(DIR) diff --git a/README b/README
t@@ -46,43 +46,36 @@ that's pretty cool!
Here are some examples:
# Tell me whenever I have a new mail
- wendy -m 256 -d ~/mails/INBOX/new -t 60 -e espeak "You got a new mail"
+ wendy -m 256 -w ~/mails/INBOX/new espeak "You got a new mail"
# On-the-fly recompilation
- wendy -l | grep -i close_write
- IN_CLOSE_WRITE ... 8
- find -name "*.c" | wendy -m 8 -q -d ~/src/dev/program/ -t 1 -e make
-
+ wendy -m 138 -w ~/src/dev/program/ make
- # Get up to date with community based projects
- wendy -m 770 -f /mnt/nfs/project/ -t 30 -e popup 'project updated'
+ # Run a script against all files create in a directory
+ wendy -m 256 -w $HOME/autoupload sh -c '/usr/local/bin/upload.sh $WENDY_INODE'
- # watch creation in the directory, and modifications on a file
- wendy -m 256 -f ./my_dir -m 8 -f file.txt -e echo awesome!
+ # watch different events for different files
+ wendy -m 256 -w ./directory -m 8 -w ./file.txt
FAQ
===
> Can it work on a folder and sub folders ?
-It does not. inotify does not handle this by default, and implementing this
-would make the code grow in complexity to a level I don't want to reach.
-But you could do something like:
-
- $ tree
- .
- ├── a
- ├── b
- │ ├── c
- │ └── d
- └── e
-
- 5 directories, 0 files
-
- $ find a -type d | wendy -m 256 -v | cut -f2
-
-That will add a watch to each directory, and output the names of the file
-created (eg: "a/b/newfile").
+Yes. By using two flags: `-r` and `-d`. The former will enable "recursive
+mode", which will add a new watch on every node trigerring an IN_CREATE
+event (note: you MUST add this even to the mask).
+The latter (`-d`) will ignore every inode that is not a directory when
+adding watches. This one is not mandatory, but could create duplicate
+events reports by watching the same events on a directory, and each file
+in this directory.
+
+Note: Because of the way inotify works, it is possible to encounter race
+conditions when creating multiple levels on directories. Specifically,
+when watching a directory "a", and doing `mkdir -p a/b/c`, the directory
+"c" will most likely not be watched, because it was created before the
+watcher on "b" was added. A workaround is to do it in multiple steps,
+to give enough time to wendy to add the necessary watchers.
---
t@@ -102,13 +95,9 @@ still prefer using wendy because of this:
* inotifywait exits upon event reception [1]
* inotifywait does not allow to launch a command on event reception [2]
* inotifywait with multiple events can end in an infinite line [3]
- * inotifywait cna't read names from stdin
* inotifywait only handle the file modification event (eg, wendy can use
the IN_ONLYDIR mask)
- * inotifywait exits right when an event occur, wendy can treat all queued
- events at a specific period
- * inotify-tools : 164kb against 12kb for wendy (ok, not that relevant)
- * I like the name 'wendy' better
+ * 'wendy' is shorter/cooler to type!
[1] I'm aware of the '--monitor' flag, but the only way to exec a command with
this is a pain that implies read, a while loop and so on.
t@@ -122,7 +111,7 @@ like:
inotifywait -e <event> ~/path/to/my/file && command
done
-Good luck with this, I prefer "wendy -m <mask> -e command"
+Good luck with this, I prefer "wendy -m <mask> command"
[3] one flag per event. events written in words:
t@@ -130,10 +119,4 @@ Good luck with this, I prefer "wendy -m <mask> -e command"
I prefer
- wendy -m 774 -f ~/path/to/my/file
-
----
-
-> Would you prefer to fight one horse sized duck, or 10 duck sized horses ?
-
-Regarding size and number, I'd rather fight horses. Ducks are silly creatures.
+ wendy -m 774 -w ~/path/to/my/file