Add nix-channel --list-generations

Add support to --list-generations
as another way to say
nix-env --profile /nix/var/nix/profiles/per-user/$USER/channels --list-generations
the way we did for nix-channel --rollback [generation id]
This commit is contained in:
Shamrock Lee 2021-05-14 01:33:03 +08:00 committed by Théophane Hufschmitt
parent 27f82ef4a8
commit b292177eec
2 changed files with 18 additions and 1 deletions

View file

@ -4,7 +4,7 @@
# Synopsis
`nix-channel` {`--add` url [*name*] | `--remove` *name* | `--list` | `--update` [*names…*] | `--rollback` [*generation*] }
`nix-channel` {`--add` url [*name*] | `--remove` *name* | `--list` | `--update` [*names…*] | `--list-generations` | `--rollback` [*generation*] }
# Description
@ -39,6 +39,15 @@ This command has the following operations:
for `nix-env` operations (by symlinking them from the directory
`~/.nix-defexpr`).
- `--list-generations`\
Prints a list of all the current existing generations for the
channel profile.
Works the same way as
```
nix-env --profile /nix/var/nix/profiles/per-user/$USER/channels --list-generations
```
- `--rollback` \[*generation*\]\
Reverts the previous call to `nix-channel
--update`. Optionally, you can specify a specific channel generation

View file

@ -177,6 +177,7 @@ static int main_nix_channel(int argc, char ** argv)
cRemove,
cList,
cUpdate,
cListGenerations,
cRollback
} cmd = cNone;
std::vector<std::string> args;
@ -193,6 +194,8 @@ static int main_nix_channel(int argc, char ** argv)
cmd = cList;
} else if (*arg == "--update") {
cmd = cUpdate;
} else if (*arg == "--list-generations") {
cmd = cListGenerations;
} else if (*arg == "--rollback") {
cmd = cRollback;
} else {
@ -237,6 +240,11 @@ static int main_nix_channel(int argc, char ** argv)
case cUpdate:
update(StringSet(args.begin(), args.end()));
break;
case cListGenerations:
if (!args.empty())
throw UsageError("'--list-generations' expects no arguments");
std::cout << runProgram(settings.nixBinDir + "/nix-env", false, {"--profile", profile, "--list-generations"}) << std::flush;
break;
case cRollback:
if (args.size() > 1)
throw UsageError("'--rollback' has at most one argument");