This question is odd. Please note that this is not an android-studio question but a snap question. android-studio only is one culprit which misbehaves and should be restrained by snap.
android-studio was installed via snap. But sometimes processes still hang in the background and eat a lot of CPU (and hence battery power) after closing android-studio. Then I need to kill those manually using the process ID with switch -9.
Is this really the intended way? With snap?
I tried to find any pointer on Internet but failed completely how to do that with the help of snap. Either the commands do not even seem to exist or nothing helped or was completely wrong. Also snap documentation seems to hide the bit I am looking for very well (or is it missing?).
Note that all the common things are no problem at all:
- Install a package from Ubuntu
- Remove a package
- Use a package (works mostly the way I want it)
- Properly update a package (after days of googling I finally found a workaround which automatically keeps things tidy)
But I am still puzzled how am I supposed to control an app in a snap package properly:
Well, it's snap, so everything is neatly packaged, right? And there certainly is some common easy way to fully stop everything in such a snap container, right?
For example, with lxc-stop container everything in the container is teared down. Easy. But with snap I found nothing similar.
Here is what I tried and was partially suggested by other pages:
$ snap status
error: unknown command "status", see 'snap help'.
$ snap stop android-studio
error: access denied (try with sudo)
It was started as a user, so the same user must be able to stop it again. sudo certainly is of reach here, but let's retry with sudo:
$ sudo snap stop android-studio
error: snap "android-studio" has no services
$ killall android-studio
android-studio: no process found
But with ps and top or htop there are processes (partly java, of course):
$ ps auxwww | grep android
tino 14352 0.0 0.0 2616 1732 ? S 12:48 0:00 /bin/sh /snap/android-studio/101/android-studio/bin/studio.sh
tino 14428 4.7 10.6 5042148 420488 ? Sl 12:48 2:19 /snap/android-studio/101/android-studio/jre/bin/java -classpath /snap/android-studio/101/android-studio/lib/bootstrap.jar:/snap/android-studio/101/android-studio/lib/extensions.jar:/snap/android-studio/101/android-studio/lib/util.jar:/snap/android-studio/101/android-studio/lib/jdom.jar:/snap/android-studio/101/android-studio/lib/log4j.jar:/snap/android-studio/101/android-studio/lib/trove4j.jar:/snap/android-studio/101/android-studio/lib/jna.jar:/snap/android-studio/101/android-studio/jre/lib/tools.jar -Xms256m -Xmx1280m -XX:ReservedCodeCacheSize=240m -XX:+UseConcMarkSweepGC -XX:SoftRefLRUPolicyMSPerMB=50 -XX:CICompilerCount=2 -Dsun.io.useCanonPrefixCache=false -Djdk.http.auth.tunneling.disabledSchemes="" -Djdk.attach.allowAttachSelf=true -Dkotlinx.coroutines.debug=off -Djdk.module.illegalAccess.silent=true -Djna.nosys=true -Djna.boot.library.path= -Didea.vendor.name=Google -Dawt.useSystemAAFontSettings=lcd -Dsun.java2d.renderer=sun.java2d.marlin.MarlinRenderingEngine -Dsun.tools.attach.tmp.only=true -XX:ErrorFile=/home/tino/java_error_in_STUDIO_%p.log -XX:HeapDumpPath=/home/tino/java_error_in_STUDIO.hprof -Didea.paths.selector=AndroidStudio4.1 -Djb.vmOptionsFile=/snap/android-studio/101/android-studio/bin/studio64.vmoptions -Didea.platform.prefix=AndroidStudio -Didea.jre.check=true com.intellij.idea.Main
tino 45016 0.0 0.0 11128 2452 pts/12 S+ 13:37 0:00 grep --color=auto android
$ kill 14352
$ kill 14352
-bash: kill: (14352) - No such process
$ kill 14428
$ kill 14428
$ ps auxwww | grep android
tino 14428 4.7 10.6 5042148 420488 ? Sl 12:48 2:19 /snap/android-studio/101/android-studio/jre/bin/java -classpath /snap/android-studio/101/android-studio/lib/bootstrap.jar:/snap/android-studio/101/android-studio/lib/extensions.jar:/snap/android-studio/101/android-studio/lib/util.jar:/snap/android-studio/101/android-studio/lib/jdom.jar:/snap/android-studio/101/android-studio/lib/log4j.jar:/snap/android-studio/101/android-studio/lib/trove4j.jar:/snap/android-studio/101/android-studio/lib/jna.jar:/snap/android-studio/101/android-studio/jre/lib/tools.jar -Xms256m -Xmx1280m -XX:ReservedCodeCacheSize=240m -XX:+UseConcMarkSweepGC -XX:SoftRefLRUPolicyMSPerMB=50 -XX:CICompilerCount=2 -Dsun.io.useCanonPrefixCache=false -Djdk.http.auth.tunneling.disabledSchemes="" -Djdk.attach.allowAttachSelf=true -Dkotlinx.coroutines.debug=off -Djdk.module.illegalAccess.silent=true -Djna.nosys=true -Djna.boot.library.path= -Didea.vendor.name=Google -Dawt.useSystemAAFontSettings=lcd -Dsun.java2d.renderer=sun.java2d.marlin.MarlinRenderingEngine -Dsun.tools.attach.tmp.only=true -XX:ErrorFile=/home/tino/java_error_in_STUDIO_%p.log -XX:HeapDumpPath=/home/tino/java_error_in_STUDIO.hprof -Didea.paths.selector=AndroidStudio4.1 -Djb.vmOptionsFile=/snap/android-studio/101/android-studio/bin/studio64.vmoptions -Didea.platform.prefix=AndroidStudio -Didea.jre.check=true com.intellij.idea.Main
tino 45020 0.0 0.0 11128 2544 pts/12 S+ 13:37 0:00 grep --color=auto android
$ kill -9 14428
$ kill -9 14428
-bash: kill: (14428) - No such process
Apparently some are die-hards and need -9 to be killed!
Notes:
- I do not want to use
killall java, because this will affect otherjavaapplications. - Of course I could create some script, which looks into
/procto sort out processes which belong tosnapand operate on this. - But I am looking for a command which involves
snapinstead of re-inventing the wheel with some independent external command based on internals ofsnap. - I ask this on AskUbuntu, because I only use
snapon Ubuntu
