### Bug Description When one has different revisions of snapcraft available, kicking off a build with one revision and performing a build with a different revision may fail. This may only truly be the case with parallel installs of snapcraft. ### To Reproduce Attempt to build a snap with some revision of snapcraft and, at a later time, attempt a build with a different revision. ### Environment Ubuntu 24.04, snapcraft 8.7+ (tested with a fork of 8.7 and latest/edge). Build using multipass (for core20 base snaps) and lxd (for core24 base snaps). Reproducible for both cases. ### snapcraft.yaml ```yaml name: test # you probably want to 'snapcraft register <name>' base: core24 # the base snap is the execution environment for this snap version: '0.1' # just for humans, typically '1.2+git' or '1.3.2' summary: Single-line elevator pitch for your amazing snap # 79 char long summary description: | This is my-snap's description. You have a paragraph or two to tell the most important story about your snap. Keep it under 100 words though, we live in tweetspace and your description wants to look good in the snap store. grade: devel # must be 'stable' to release into candidate/stable channels confinement: devmode # use 'strict' once you have the right plugs and slots parts: my-part: # See 'snapcraft plugins' plugin: nil ``` ### Relevant log output ```shell dilyn@Ares:~/test -> snapcraft Starting snapcraft, version 8.7.4.post115 Logging execution to '/home/dilyn/.local/state/snapcraft/log/snapcraft-20250524-003630.231509.log' Launching managed ubuntu 24.04 instance... Creating instance from base instance Starting instance Starting snapcraft, version 8.7.4.post115 Logging execution to '/tmp/snapcraft.log' Initialising lifecycle Installing build-packages Installing build-snaps Pulling my-part Building my-part Staging my-part Priming my-part Packing... Reading snap metadata... Running linters... Running linter: classic Running linter: library Creating snap package... Packed test_0.1_amd64.snap dilyn@Ares:~/test -> sce /snap/snapcraft_edge/14924/bin/python: can't open file '/snap/snapcraft/14924/bin/snapcraft': [Errno 2] No such file or directory ``` ### Additional context Enable the parallel installs experimental feature and install two versions of snapcraft. It might be that even the same version (revision) but with two different `$SNAP_INSTANCE_NAME`s would satisfy reproducing this (but perhaps not). Install snapcraft from e.g. 8.x/stable and latest/edge. I specifically have a snapcraft from 8.7.x and a snapcraft from latest/edge (aliased to `sce`). I've reproduced this with `base: core2{0,4}` snaps building with both LXD and Multipass as providers. The issue is reminiscent of previously reported parallel install bugs: https://github.com/canonical/snapcraft/issues/4683 https://github.com/canonical/snapcraft/issues/4927 Uncertain if this is a regression in behaviour; I haven't been dilligently testing my parallel snapcrafts (heavily testing kernel/initrd plugins mostly, can't use other snapcrafts...) The specific error message in the log output *is* accurate; there is no `14924` directory in `/snap/snapcraft`; I only have `x1` and `x2` in that directory :)