git/builtin/symbolic-ref.c

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#include "builtin.h"
#include "config.h"
#include "gettext.h"
#include "refs.h"
#include "parse-options.h"
#include "strbuf.h"
static const char * const git_symbolic_ref_usage[] = {
N_("git symbolic-ref [-m <reason>] <name> <ref>"),
N_("git symbolic-ref [-q] [--short] [--no-recurse] <name>"),
N_("git symbolic-ref --delete [-q] <name>"),
NULL
};
symbolic-ref: teach "--[no-]recurse" option Suppose you are managing many maintenance tracks in your project, and some of the more recent ones are maint-2.36 and maint-2.37. Further imagine that your project recently tagged the official 2.38 release, which means you would need to start maint-2.38 track soon, by doing: $ git checkout -b maint-2.38 v2.38.0^0 $ git branch --list 'maint-2.3[6-9]' * maint-2.38 maint-2.36 maint-2.37 So far, so good. But it also is reasonable to want not to have to worry about which maintenance track is the latest, by pointing a more generic-sounding 'maint' branch at it, by doing: $ git symbolic-ref refs/heads/maint refs/heads/maint-2.38 which would allow you to say "whichever it is, check out the latest maintenance track", by doing: $ git checkout maint $ git branch --show-current maint-2.38 It is arguably better to say that we are on 'maint-2.38' rather than on 'maint', and "git merge/pull" would record "into maint-2.38" and not "into maint", so I think what we have is a good behaviour. One thing that is slightly irritating, however, is that I do not think there is a good way (other than "cat .git/HEAD") to learn that you checked out 'maint' to get into that state. Just like the output of "git branch --show-current" shows above, "git symbolic-ref HEAD" would report 'refs/heads/maint-2.38', bypassing the intermediate symbolic ref at 'refs/heads/maint' that is pointed at by HEAD. The internal resolve_ref() API already has the necessary support for stopping after resolving a single level of a symbolic-ref, and we can expose it by adding a "--[no-]recurse" option to the command. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-10-07 22:00:39 +00:00
static int check_symref(const char *HEAD, int quiet, int shorten, int recurse, int print)
{
symbolic-ref: teach "--[no-]recurse" option Suppose you are managing many maintenance tracks in your project, and some of the more recent ones are maint-2.36 and maint-2.37. Further imagine that your project recently tagged the official 2.38 release, which means you would need to start maint-2.38 track soon, by doing: $ git checkout -b maint-2.38 v2.38.0^0 $ git branch --list 'maint-2.3[6-9]' * maint-2.38 maint-2.36 maint-2.37 So far, so good. But it also is reasonable to want not to have to worry about which maintenance track is the latest, by pointing a more generic-sounding 'maint' branch at it, by doing: $ git symbolic-ref refs/heads/maint refs/heads/maint-2.38 which would allow you to say "whichever it is, check out the latest maintenance track", by doing: $ git checkout maint $ git branch --show-current maint-2.38 It is arguably better to say that we are on 'maint-2.38' rather than on 'maint', and "git merge/pull" would record "into maint-2.38" and not "into maint", so I think what we have is a good behaviour. One thing that is slightly irritating, however, is that I do not think there is a good way (other than "cat .git/HEAD") to learn that you checked out 'maint' to get into that state. Just like the output of "git branch --show-current" shows above, "git symbolic-ref HEAD" would report 'refs/heads/maint-2.38', bypassing the intermediate symbolic ref at 'refs/heads/maint' that is pointed at by HEAD. The internal resolve_ref() API already has the necessary support for stopping after resolving a single level of a symbolic-ref, and we can expose it by adding a "--[no-]recurse" option to the command. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-10-07 22:00:39 +00:00
int resolve_flags, flag;
const char *refname;
resolve_flags = (recurse ? 0 : RESOLVE_REF_NO_RECURSE);
refname = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
HEAD, resolve_flags, NULL, &flag);
if (!refname)
die("No such ref: %s", HEAD);
else if (!(flag & REF_ISSYMREF)) {
if (!quiet)
die("ref %s is not a symbolic ref", HEAD);
else
return 1;
}
if (print) {
char *to_free = NULL;
if (shorten)
refname = to_free = refs_shorten_unambiguous_ref(get_main_ref_store(the_repository),
refname,
0);
puts(refname);
free(to_free);
}
return 0;
}
int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
{
symbolic-ref: teach "--[no-]recurse" option Suppose you are managing many maintenance tracks in your project, and some of the more recent ones are maint-2.36 and maint-2.37. Further imagine that your project recently tagged the official 2.38 release, which means you would need to start maint-2.38 track soon, by doing: $ git checkout -b maint-2.38 v2.38.0^0 $ git branch --list 'maint-2.3[6-9]' * maint-2.38 maint-2.36 maint-2.37 So far, so good. But it also is reasonable to want not to have to worry about which maintenance track is the latest, by pointing a more generic-sounding 'maint' branch at it, by doing: $ git symbolic-ref refs/heads/maint refs/heads/maint-2.38 which would allow you to say "whichever it is, check out the latest maintenance track", by doing: $ git checkout maint $ git branch --show-current maint-2.38 It is arguably better to say that we are on 'maint-2.38' rather than on 'maint', and "git merge/pull" would record "into maint-2.38" and not "into maint", so I think what we have is a good behaviour. One thing that is slightly irritating, however, is that I do not think there is a good way (other than "cat .git/HEAD") to learn that you checked out 'maint' to get into that state. Just like the output of "git branch --show-current" shows above, "git symbolic-ref HEAD" would report 'refs/heads/maint-2.38', bypassing the intermediate symbolic ref at 'refs/heads/maint' that is pointed at by HEAD. The internal resolve_ref() API already has the necessary support for stopping after resolving a single level of a symbolic-ref, and we can expose it by adding a "--[no-]recurse" option to the command. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-10-07 22:00:39 +00:00
int quiet = 0, delete = 0, shorten = 0, recurse = 1, ret = 0;
const char *msg = NULL;
struct option options[] = {
OPT__QUIET(&quiet,
N_("suppress error message for non-symbolic (detached) refs")),
OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),
OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
symbolic-ref: teach "--[no-]recurse" option Suppose you are managing many maintenance tracks in your project, and some of the more recent ones are maint-2.36 and maint-2.37. Further imagine that your project recently tagged the official 2.38 release, which means you would need to start maint-2.38 track soon, by doing: $ git checkout -b maint-2.38 v2.38.0^0 $ git branch --list 'maint-2.3[6-9]' * maint-2.38 maint-2.36 maint-2.37 So far, so good. But it also is reasonable to want not to have to worry about which maintenance track is the latest, by pointing a more generic-sounding 'maint' branch at it, by doing: $ git symbolic-ref refs/heads/maint refs/heads/maint-2.38 which would allow you to say "whichever it is, check out the latest maintenance track", by doing: $ git checkout maint $ git branch --show-current maint-2.38 It is arguably better to say that we are on 'maint-2.38' rather than on 'maint', and "git merge/pull" would record "into maint-2.38" and not "into maint", so I think what we have is a good behaviour. One thing that is slightly irritating, however, is that I do not think there is a good way (other than "cat .git/HEAD") to learn that you checked out 'maint' to get into that state. Just like the output of "git branch --show-current" shows above, "git symbolic-ref HEAD" would report 'refs/heads/maint-2.38', bypassing the intermediate symbolic ref at 'refs/heads/maint' that is pointed at by HEAD. The internal resolve_ref() API already has the necessary support for stopping after resolving a single level of a symbolic-ref, and we can expose it by adding a "--[no-]recurse" option to the command. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-10-07 22:00:39 +00:00
OPT_BOOL(0, "recurse", &recurse, N_("recursively dereference (default)")),
OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
OPT_END(),
};
git_config(git_default_config, NULL);
argc = parse_options(argc, argv, prefix, options,
git_symbolic_ref_usage, 0);
if (msg && !*msg)
die("Refusing to perform update with empty message");
if (delete) {
if (argc != 1)
usage_with_options(git_symbolic_ref_usage, options);
symbolic-ref: teach "--[no-]recurse" option Suppose you are managing many maintenance tracks in your project, and some of the more recent ones are maint-2.36 and maint-2.37. Further imagine that your project recently tagged the official 2.38 release, which means you would need to start maint-2.38 track soon, by doing: $ git checkout -b maint-2.38 v2.38.0^0 $ git branch --list 'maint-2.3[6-9]' * maint-2.38 maint-2.36 maint-2.37 So far, so good. But it also is reasonable to want not to have to worry about which maintenance track is the latest, by pointing a more generic-sounding 'maint' branch at it, by doing: $ git symbolic-ref refs/heads/maint refs/heads/maint-2.38 which would allow you to say "whichever it is, check out the latest maintenance track", by doing: $ git checkout maint $ git branch --show-current maint-2.38 It is arguably better to say that we are on 'maint-2.38' rather than on 'maint', and "git merge/pull" would record "into maint-2.38" and not "into maint", so I think what we have is a good behaviour. One thing that is slightly irritating, however, is that I do not think there is a good way (other than "cat .git/HEAD") to learn that you checked out 'maint' to get into that state. Just like the output of "git branch --show-current" shows above, "git symbolic-ref HEAD" would report 'refs/heads/maint-2.38', bypassing the intermediate symbolic ref at 'refs/heads/maint' that is pointed at by HEAD. The internal resolve_ref() API already has the necessary support for stopping after resolving a single level of a symbolic-ref, and we can expose it by adding a "--[no-]recurse" option to the command. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-10-07 22:00:39 +00:00
ret = check_symref(argv[0], 1, 0, 0, 0);
if (ret)
die("Cannot delete %s, not a symbolic ref", argv[0]);
if (!strcmp(argv[0], "HEAD"))
die("deleting '%s' is not allowed", argv[0]);
return refs_delete_ref(get_main_ref_store(the_repository),
NULL, argv[0], NULL, REF_NO_DEREF);
}
switch (argc) {
case 1:
symbolic-ref: teach "--[no-]recurse" option Suppose you are managing many maintenance tracks in your project, and some of the more recent ones are maint-2.36 and maint-2.37. Further imagine that your project recently tagged the official 2.38 release, which means you would need to start maint-2.38 track soon, by doing: $ git checkout -b maint-2.38 v2.38.0^0 $ git branch --list 'maint-2.3[6-9]' * maint-2.38 maint-2.36 maint-2.37 So far, so good. But it also is reasonable to want not to have to worry about which maintenance track is the latest, by pointing a more generic-sounding 'maint' branch at it, by doing: $ git symbolic-ref refs/heads/maint refs/heads/maint-2.38 which would allow you to say "whichever it is, check out the latest maintenance track", by doing: $ git checkout maint $ git branch --show-current maint-2.38 It is arguably better to say that we are on 'maint-2.38' rather than on 'maint', and "git merge/pull" would record "into maint-2.38" and not "into maint", so I think what we have is a good behaviour. One thing that is slightly irritating, however, is that I do not think there is a good way (other than "cat .git/HEAD") to learn that you checked out 'maint' to get into that state. Just like the output of "git branch --show-current" shows above, "git symbolic-ref HEAD" would report 'refs/heads/maint-2.38', bypassing the intermediate symbolic ref at 'refs/heads/maint' that is pointed at by HEAD. The internal resolve_ref() API already has the necessary support for stopping after resolving a single level of a symbolic-ref, and we can expose it by adding a "--[no-]recurse" option to the command. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-10-07 22:00:39 +00:00
ret = check_symref(argv[0], quiet, shorten, recurse, 1);
break;
case 2:
if (!strcmp(argv[0], "HEAD") &&
!starts_with(argv[1], "refs/"))
die("Refusing to point HEAD outside of refs/");
if (check_refname_format(argv[1], REFNAME_ALLOW_ONELEVEL) < 0)
die("Refusing to set '%s' to invalid ref '%s'", argv[0], argv[1]);
ret = !!refs_update_symref(get_main_ref_store(the_repository),
argv[0], argv[1], msg);
break;
default:
usage_with_options(git_symbolic_ref_usage, options);
}
return ret;
}