Issue
When trying to bundle a mono app in a snap package, I'm getting this exception when the app tries to make a simple HTTP request:
System.AggregateException: One or more errors occurred. ---> System.DllNotFoundException: libc
at (wrapper managed-to-native) System.Platform:uname (intptr)
at System.Platform.CheckOS () [0x00022] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Platform.get_IsMacOS () [0x0000a] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.GetSystemWebProxy () [0x00149] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.GetDefaultWebProxy () [0x00016] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.get_DefaultWebProxy () [0x00024] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.GlobalProxySelection.get_Select () [0x00000] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.HttpWebRequest..ctor (System.Uri uri) [0x0008d] in <bd46d4d4f7964dfa9beea098499ab597>:0
at (wrapper remoting-invoke-with-check) System.Net.HttpWebRequest:.ctor (System.Uri)
at System.Net.Http.HttpClientHandler.CreateWebRequest (System.Net.Http.HttpRequestMessage request) [0x00006] in <41c316444c8a4380b9344ba09eeb18de>:0
at System.Net.Http.HttpClientHandler+<SendAsync>c__async0.MoveNext () [0x0006a] in <41c316444c8a4380b9344ba09eeb18de>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0004e] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Net.Http.HttpClient+<SendAsyncWorker>c__async0.MoveNext () [0x000f3] in <41c316444c8a4380b9344ba09eeb18de>:0
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.DllNotFoundException: libc
at (wrapper managed-to-native) System.Platform:uname (intptr)
at System.Platform.CheckOS () [0x00022] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Platform.get_IsMacOS () [0x0000a] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.GetSystemWebProxy () [0x00149] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.GetDefaultWebProxy () [0x00016] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.get_DefaultWebProxy () [0x00024] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.GlobalProxySelection.get_Select () [0x00000] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.HttpWebRequest..ctor (System.Uri uri) [0x0008d] in <bd46d4d4f7964dfa9beea098499ab597>:0
at (wrapper remoting-invoke-with-check) System.Net.HttpWebRequest:.ctor (System.Uri)
at System.Net.Http.HttpClientHandler.CreateWebRequest (System.Net.Http.HttpRequestMessage request) [0x00006] in <41c316444c8a4380b9344ba09eeb18de>:0
at System.Net.Http.HttpClientHandler+<SendAsync>c__async0.MoveNext () [0x0006a] in <41c316444c8a4380b9344ba09eeb18de>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0004e] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Net.Http.HttpClient+<SendAsyncWorker>c__async0.MoveNext () [0x000f3] in <41c316444c8a4380b9344ba09eeb18de>:0 <---
System.AggregateException: One or more errors occurred. ---> System.DllNotFoundException: libc
at (wrapper managed-to-native) System.Platform:uname (intptr)
at System.Platform.CheckOS () [0x00022] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Platform.get_IsMacOS () [0x0000a] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.GetSystemWebProxy () [0x00149] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.GetDefaultWebProxy () [0x00016] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.get_DefaultWebProxy () [0x00024] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.GlobalProxySelection.get_Select () [0x00000] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.HttpWebRequest..ctor (System.Uri uri) [0x0008d] in <bd46d4d4f7964dfa9beea098499ab597>:0
at (wrapper remoting-invoke-with-check) System.Net.HttpWebRequest:.ctor (System.Uri)
at System.Net.Http.HttpClientHandler.CreateWebRequest (System.Net.Http.HttpRequestMessage request) [0x00006] in <41c316444c8a4380b9344ba09eeb18de>:0
at System.Net.Http.HttpClientHandler+<SendAsync>c__async0.MoveNext () [0x0006a] in <41c316444c8a4380b9344ba09eeb18de>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0004e] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Net.Http.HttpClient+<SendAsyncWorker>c__async0.MoveNext () [0x000f3] in <41c316444c8a4380b9344ba09eeb18de>:0
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.DllNotFoundException: libc
at (wrapper managed-to-native) System.Platform:uname (intptr)
at System.Platform.CheckOS () [0x00022] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Platform.get_IsMacOS () [0x0000a] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.GetSystemWebProxy () [0x00149] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.GetDefaultWebProxy () [0x00016] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.WebRequest.get_DefaultWebProxy () [0x00024] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.GlobalProxySelection.get_Select () [0x00000] in <bd46d4d4f7964dfa9beea098499ab597>:0
at System.Net.HttpWebRequest..ctor (System.Uri uri) [0x0008d] in <bd46d4d4f7964dfa9beea098499ab597>:0
at (wrapper remoting-invoke-with-check) System.Net.HttpWebRequest:.ctor (System.Uri)
at System.Net.Http.HttpClientHandler.CreateWebRequest (System.Net.Http.HttpRequestMessage request) [0x00006] in <41c316444c8a4380b9344ba09eeb18de>:0
at System.Net.Http.HttpClientHandler+<SendAsync>c__async0.MoveNext () [0x0006a] in <41c316444c8a4380b9344ba09eeb18de>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0004e] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in <8f2c484307284b51944a1a13a14c0266>:0
at System.Net.Http.HttpClient+<SendAsyncWorker>c__async0.MoveNext () [0x000f3] in <41c316444c8a4380b9344ba09eeb18de>:0 <---
The snapcraft.yaml looks like this:
name: foo
base: core18 # the base snap is the execution environment for this snap
version: '0.3.1.0' # just for humans, typically '1.2+git' or '1.3.2'
summary: bar
description: |
baz
grade: devel # must be 'stable' to release into candidate/stable channels
confinement: strict
apps:
foo:
command: bin/foo
parts:
foo:
plugin: dump
source: ./staging
stage-packages:
- mono-complete
I create the snap this way:
./configure.sh --prefix=./staging
make
make install
snapcraft
I tried to fix this by bundling libc-related packages into the snap, adding them to stage-packages:
stage-packages:
- mono-complete
- libc6
- libc6-dev
- libc-dev-bin
- libc-bin
But the problem still exists. And if I try to map these with layouts:
layout:
/lib/x86_64-linux-gnu:
bind: $SNAP/lib/x86_64-linux-gnu
/usr/lib:
bind: $SNAP/usr/lib
Then I get a crash:
$ snap run foo
execv failed: No such file or directory
Maybe that /usr/lib mapping was too much, but if I constrain it to this:
layout:
/lib/x86_64-linux-gnu:
bind: $SNAP/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu:
bind: $SNAP/usr/lib/x86_64-linux-gnu
Then I still get the DllNotFoundException.
Solution
I finally solved this with this commit:
https://github.com/nblockchain/geewallet/commit/cba6abf52eaf2709b8b6a974079ac5713fd3aeec
The most important bit is to place this in the launcher script of your app:
if [[ $SNAP ]]; then
PKG_DIR=$SNAP/usr
Answered By - knocte Answer Checked By - Candace Johnson (WPSolving Volunteer)