Bug#800388: PathChanged triggers too early, not just when file is closed

[Joachim Breitner]

Package: systemd
Version: 226-3
Severity: normal
Control: block 799782 by -1

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Hi,

local-apt-repository ships with the following file:

$ cat /lib/systemd/system/local-apt-repository.path
[Path]
PathChanged=/srv/local-apt-repository

[Install]
WantedBy=paths.target

If a process opens a not-yet-existing file in /srv/local-apt-repository,
starts writing and eventually closes it that systemd would activate the
corresponding service only after the close – at least that is my reading
of systemd.path(5).

This can be reproduced by installing local-apt-repository, and running

$ pv -L 100 < .../some.deb > /srv/local-apt-repository/some.deb

and observing in the journal that dpkg-deb complains about an invalid
file.

Is the documentation misleading me here, or is there a bug?

If it is not a bug: Would it be possible to provide the behaviour that
was hoping for here?

Thanks,
Joachim

- -- Package-specific info:

- -- System Information:
Debian Release: stretch/sid
  APT prefers buildd-unstable
  APT policy: (500, 'buildd-unstable'), (500, 'unstable'), (101, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.1.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  adduser         3.113+nmu3
ii  libacl1         2.2.52-2
ii  libapparmor1    2.10-2+b1
ii  libaudit1       1:2.4.4-3+b1
ii  libblkid1       2.27-3
ii  libc6           2.19-22
ii  libcap2         1:2.24-11
ii  libcap2-bin     1:2.24-11
ii  libcryptsetup4  2:1.6.6-5
ii  libgcrypt20     1.6.3-2
ii  libkmod2        21-1
ii  liblzma5        5.1.1alpha+20120614-2.1
ii  libmount1       2.27-3
ii  libpam0g        1.1.8-3.1
ii  libseccomp2     2.2.3-2
ii  libselinux1     2.3-2+b1
ii  libsystemd0     226-3
ii  mount           2.27-3
ii  sysv-rc         2.88dsf-59.2
ii  udev            226-3
ii  util-linux      2.27-3

Versions of packages systemd recommends:
ii  dbus            1.10.0-3
ii  libpam-systemd  226-3

Versions of packages systemd suggests:
pn  systemd-container  <none>
ii  systemd-ui         3-4

- -- Configuration Files:
/etc/systemd/journald.conf changed [not included]
/etc/systemd/logind.conf changed [not included]

- -- no debconf information

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