Crash with broken installation if upgrade called from invalid cwd

[yminsky]

The upgrade I just attempted died in a rather mysterious way.

[ERROR] Actions cancelled because of Sys_error("No such file or directory")

The former state can be restored with:
opam switch import "~/.opam/system/backup/state-20160120061500.export"
Fatal error:
Sys_error("No such file or directory")
Backtrace:
  Raised at file "client/opamSolution.ml", line 468, characters 10-11
  Called from file "client/opamClient.ml", line 913, characters 19-71
  Called from file "client/opamClient.ml", line 153, characters 4-7

Here's the full terminal output.

$ opam upgrade
The following actions will be performed:
  ↗  upgrade   ocp-build           1.99.9-beta to 1.99.11-beta
  ↗  upgrade   ppx_deriving        3.0 to 3.1
  ↗  upgrade   lacaml              7.2.6 to 8.0.5
  ∗  install   base-ocamlbuild     base
  ↻  recompile ocp-indent          1.5.2                        [uses ocp-build]
  ↻  recompile ocamlbuild          0
  ↻  recompile ppx_driver          113.24.00
  ↻  recompile oasis               0.4.5
  ↻  recompile lbfgs               0.8.7                        [uses lacaml]
  ↻  recompile cppo                1.3.1
  ↻  recompile ppx_type_conv       113.24.00                    [uses ppx_deriving]
  ↻  recompile ppx_pipebang        113.24.00
  ↻  recompile ppx_let             113.24.00
  ↻  recompile ppx_inline_test     113.24.00
  ↻  recompile ppx_here            113.24.00
  ↻  recompile yojson              1.3.0
  ↻  recompile utop                1.18.1
  ↻  recompile ocplib-endian       0.8
  ↻  recompile js_of_ocaml         2.7                          [uses ppx_deriving]
  ↻  recompile ppx_variants_conv   113.24.00                    [uses ppx_type_conv]
  ↻  recompile ppx_typerep_conv    113.24.00                    [uses ppx_type_conv]
  ↻  recompile ppx_sexp_conv       113.24.00                    [uses ppx_type_conv]
  ↻  recompile ppx_fields_conv     113.24.00                    [uses ppx_type_conv]
  ↻  recompile ppx_enumerate       113.24.00                    [uses ppx_type_conv]
  ↻  recompile ppx_conv_func       113.24.00                    [uses ppx_type_conv]
  ↻  recompile ppx_compare         113.24.00                    [uses ppx_type_conv]
  ↻  recompile ppx_bin_prot        113.24.01                    [uses ppx_type_conv]
  ↻  recompile ppx_bench           113.24.00
  ↻  recompile ppx_fail            113.24.00
  ↻  recompile ppx_deriving_yojson 2.4                          [uses ppx_deriving]
  ↻  recompile merlin              2.3.1
  ↻  recompile xtmpl               0.13.0                       [uses js_of_ocaml]
  ↻  recompile xmldiff             0.5.0                        [uses js_of_ocaml]
  ↻  recompile d3                  0.2.2                        [uses js_of_ocaml]
  ↗  upgrade   ipaddr              2.4.0 to 2.7.0
  ↻  recompile ppx_sexp_value      113.24.00                    [uses ppx_sexp_conv]
  ↻  recompile ppx_sexp_message    113.24.00                    [uses ppx_sexp_conv]
  ↻  recompile ppx_custom_printf   113.24.00                    [uses ppx_sexp_conv]
  ↻  recompile ppx_xml_conv        113.24.00                    [uses ppx_type_conv]
  ↻  recompile ppx_assert          113.24.00                    [uses ppx_type_conv]
  ↻  recompile ppx_expect          113.24.00                    [uses ppx_sexp_conv, ppx_compare, ppx_assert, etc.]
  ↻  recompile ppx_jane            113.24.01                    [uses ppx_typerep_conv, ppx_fields_conv, ppx_compare, etc.]
  ↻  recompile core_kernel         113.24.00                    [uses ppx_assert]
  ↻  recompile re2                 113.24.00                    [uses ppx_assert]
  ↻  recompile patience_diff       113.24.00                    [uses ppx_assert]
  ↻  recompile core                113.24.01                    [uses ppx_assert]
  ↻  recompile async_kernel        113.24.00                    [uses ppx_assert]
  ↻  recompile textutils           113.24.00                    [uses ppx_assert]
  ↻  recompile incremental         113.24.00                    [uses ppx_assert]
  ↻  recompile async_unix          113.24.00                    [uses ppx_assert]
  ↻  recompile async_rpc_kernel    113.24.00                    [uses ppx_assert]
  ↻  recompile core_extended       113.24.00                    [uses ppx_assert]
  ↻  recompile async_extra         113.24.00                    [uses ppx_assert]
  ↻  recompile patdiff             113.24.00                    [uses ppx_assert]
  ↻  recompile core_profiler       113.24.00                    [uses ppx_assert]
  ↻  recompile core_bench          113.24.00                    [uses ppx_assert]
  ↻  recompile async               113.24.00                    [uses ppx_assert]
  ↗  upgrade   cstruct             1.8.0 to 1.9.0
  ↻  recompile rpc_parallel        113.24.00                    [uses ppx_assert]
  ↻  recompile async_shell         113.24.00                    [uses ppx_assert]
  ↻  recompile async_find          113.24.00                    [uses ppx_assert]
  ↻  recompile async_inotify       113.24.00                    [uses ppx_assert]
  ↻  recompile async_extended      113.24.00                    [uses ppx_assert]
===== ∗  1   ↻  57   ↗  5 =====
Do you want to continue ? [Y/n] y

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫
[async] Archive in cache
[async_extended] Archive in cache
[async_extra] Archive in cache
[async_find] Archive in cache
[async_inotify] Archive in cache
[async_kernel] Archive in cache
[async_rpc_kernel] Archive in cache
[async_shell] Archive in cache
[async_unix] Archive in cache
[core_bench] Archive in cache
[core_extended] Archive in cache
[core_kernel] Archive in cache
[core_profiler] Archive in cache
[cppo] Archive in cache
[cstruct] Archive in cache
[d3] Archive in cache
[incremental] Archive in cache
[default] https://opam.ocaml.org/archives/ipaddr.2.7.0+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/cstruct.1.9.0+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/core.113.24.01+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/lacaml.8.0.5+opam.tar.gz downloaded
[merlin] Archive in cache
[default] https://opam.ocaml.org/archives/js_of_ocaml.2.7+opam.tar.gz downloaded
[ocp-build] Archive in cache
[default] https://opam.ocaml.org/archives/lbfgs.0.8.7+opam.tar.gz downloaded
[ocp-indent] Archive in cache
[ocplib-endian] Archive in cache
[patdiff] Archive in cache
[patience_diff] Archive in cache
[default] https://opam.ocaml.org/archives/ocp-build.1.99.11-beta+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_assert.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_bench.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_bin_prot.113.24.01+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/oasis.0.4.5+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_compare.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_conv_func.113.24.00+opam.tar.gz downloaded
[ppx_deriving_yojson] Archive in cache
[default] https://opam.ocaml.org/archives/ppx_custom_printf.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_deriving.3.1+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_driver.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_enumerate.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_expect.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_fail.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_fields_conv.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_here.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_jane.113.24.01+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_inline_test.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_let.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_pipebang.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_sexp_message.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_sexp_conv.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_sexp_value.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_type_conv.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/ppx_typerep_conv.113.24.00+opam.tar.gz downloaded
[re2] Archive in cache
[rpc_parallel] Archive in cache
[textutils] Archive in cache
[default] https://opam.ocaml.org/archives/ppx_variants_conv.113.24.00+opam.tar.gz downloaded
[xmldiff] Archive in cache
[xtmpl] Archive in cache
[default] https://opam.ocaml.org/archives/ppx_xml_conv.113.24.00+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/yojson.1.3.0+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/utop.1.18.1+opam.tar.gz downloaded

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫
⊘  removed   async_extended.113.24.00
⊘  removed   async_inotify.113.24.00
⊘  removed   async_find.113.24.00
⊘  removed   async_shell.113.24.00
⊘  removed   core_bench.113.24.00
⊘  removed   core_profiler.113.24.00
⊘  removed   incremental.113.24.00
⊘  removed   merlin.2.3.1
⊘  removed   ocp-indent.1.5.2
⊘  removed   lbfgs.0.8.7
⊘  removed   ipaddr.2.4.0
⊘  removed   patdiff.113.24.00
⊘  removed   core_extended.113.24.00
⊘  removed   patience_diff.113.24.00
⊘  removed   ppx_deriving_yojson.2.4
⊘  removed   ppx_xml_conv.113.24.00
⊘  removed   ppx_conv_func.113.24.00
⊘  removed   re2.113.24.00
⊘  removed   rpc_parallel.113.24.00
⊘  removed   textutils.113.24.00
⊘  removed   lacaml.7.2.6
⊘  removed   ocp-build.1.99.9-beta
⊘  removed   xmldiff.0.5.0
⊘  removed   xtmpl.0.13.0
∗  installed base-ocamlbuild.base
⊘  removed   utop.1.18.1
⊘  removed   yojson.1.3.0
⊘  removed   d3.0.2.2
⊘  removed   cstruct.1.8.0
⊘  removed   async.113.24.00
⊘  removed   async_extra.113.24.00
⊘  removed   async_rpc_kernel.113.24.00
⊘  removed   async_unix.113.24.00
⊘  removed   async_kernel.113.24.00
⊘  removed   core.113.24.01
⊘  removed   core_kernel.113.24.00
⊘  removed   ppx_jane.113.24.01
⊘  removed   ppx_bench.113.24.00
⊘  removed   ppx_bin_prot.113.24.01
⊘  removed   ppx_enumerate.113.24.00
⊘  removed   ppx_expect.113.24.00
⊘  removed   ppx_assert.113.24.00
⊘  removed   ppx_compare.113.24.00
⊘  removed   ppx_custom_printf.113.24.00
⊘  removed   ppx_fail.113.24.00
⊘  removed   ppx_fields_conv.113.24.00
⊘  removed   ppx_inline_test.113.24.00
⊘  removed   ppx_let.113.24.00
⊘  removed   ppx_pipebang.113.24.00
⊘  removed   ppx_sexp_message.113.24.00
⊘  removed   ppx_sexp_value.113.24.00
⊘  removed   ppx_here.113.24.00
⊘  removed   ppx_sexp_conv.113.24.00
⊘  removed   ppx_typerep_conv.113.24.00
⊘  removed   ppx_variants_conv.113.24.00
⊘  removed   ppx_type_conv.113.24.00
⊘  removed   ppx_driver.113.24.00
⊘  removed   ocplib-endian.0.8
⊘  removed   js_of_ocaml.2.7
[ERROR] Actions cancelled because of Sys_error("No such file or directory")

The former state can be restored with:
opam switch import "~/.opam/system/backup/state-20160120061500.export"
Fatal error:
Sys_error("No such file or directory")
Backtrace:
  Raised at file "client/opamSolution.ml", line 468, characters 10-11
  Called from file "client/opamClient.ml", line 913, characters 19-71
  Called from file "client/opamClient.ml", line 153, characters 4-7

[yminsky]

Upon some further investigation, I believe this occurred because the directory that this was being run from no longer existed. It's perhaps worth bailing out earlier and giving a better error message in this case.

[dsheets]

This is similar to #2435 and probably indicates that we need to test various operations when in an invalid cwd.

Which version of opam are you using ? I'm not able to reproduce with master, nor branch-1.2.

[AltGr]

opam normally detects when it's run with an invalid CWD, but may sometimes break when run from a directory that it itself removes, e.g. ~/.opam/<switch>/build/ (now ~/.opam/<switch>/.opam-switch/build). I am not sure if we should make sure to remove the parts that rely on cwd, or if we should change it at startup always.