Can't re-install existing snap

snapd
1

It appears snap gets confused when installing a snap that’s already installed:

$ sudo cp /var/lib/snapd/snaps/snapcraft_417.snap /run/
[sudo] password for cris: 
$ snap install /run/snapcraft_417.snap --classic
error: cannot perform the following tasks:
- Copy snap "snapcraft" data (cannot copy "/home/cris/snap/snapcraft/417" to "/home/cris/snap/snapcraft/417": failed to copy all: "cp: cannot stat '/home/cris/snap/snapcraft/417': No such file or directory" (1))
$ snap remove snapcraft
snapcraft removed
$ snap install /run/snapcraft_417.snap 
error: cannot perform the following tasks:
- Mount snap "snapcraft" (417) (snap "snapcraft" requires classic confinement)
$ snap install /run/snapcraft_417.snap --classic
snapcraft 2.33+git34.5887a82 from 'canonical' installed

This is a problem for snapcraft which pushes snaps from the host into containers to ensure they’re updated.

$ snap version
snap    2.26.14
snapd   2.26.14
series  16
ubuntu  16.04
kernel  4.4.0-87-generic

I can reproduce both in a clean LXD instance as well as my native host machine used for development (same “version” output).

2

Thanks for the report. We’ll get that fixed.

3

Yeap! This was fixed recently (in #3611, merged about a month ago so 2.27 should have it I think)

~$ snap install test-snapd-tools
test-snapd-tools 1.0 from 'canonical' installed
~$ cp /var/lib/snapd/snaps/test-snapd-tools_6.snap .
~$ snap install ./test-snapd-tools_6.snap 
test-snapd-tools 1.0 from 'canonical' installed
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4

Even with core 16-2.27.4 from the beta channel the problem persists - as far as I understand the snapd from the core snap should be used then via the re-exec feature?

5

“snap version” will tell you, it always reports the actual running version

6

Indeed snap version seems to agree with my assumption, I’m just wondering because it still doesn’t work.

$ snap refresh core --beta
core (beta) 16-2.27.4 from 'canonical' refreshed
$ snap install /run/snapcraft_417.snap --classic
error: cannot perform the following tasks:
- Copy snap "snapcraft" data (cannot copy "/var/snap/snapcraft/417" to "/var/snap/snapcraft/417": failed to copy all: "cp: cannot stat '/var/snap/snapcraft/417': No such file or directory" (1))
$ snap version
snap    2.27.4
snapd   2.27.4
series  16
ubuntu  16.04
kernel  4.4.0-87-generic
7

could you try core from edge?

8 
$ snap refresh core --edge
core (edge) 16-2.27.3+git330.59ff0b1 from 'canonical' refreshed
$ snap install /run/snapcraft_417.snap --classic

That one appears to work. Thanks! From the version shown by snap info I thought it was an older one, but it seems to have the fix.

9

I’m not sure what’s going on with the version, indeed, but that’s a separate issue. Could you mark the topic “solved”?

10

the version is the master git commit on top of the last release … so 2.27.3-gitF003AR is correct … once .4 is in stable it should move on

1 Like