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| author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2020-11-12 18:23:46 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-11-23 16:48:05 +0100 |
| commit | 51178d4979c9caeef95d616dcd3d47bdcd81a58e (patch) | |
| tree | 2cfb79d6df18ff969ba6d7552cef899ef9f58b7a | |
| parent | 0c2c24508d810a59709d598474b20eff4b81c4f9 (diff) | |
| download | barebox-51178d4979c9caeef95d616dcd3d47bdcd81a58e.tar.gz barebox-51178d4979c9caeef95d616dcd3d47bdcd81a58e.tar.xz | |
fs: introduce unsetenv() to prepare for changing setenv(var, "") behavior
Currently, we treat setenv(var, "") and setenv(var, NULL) the same
and delete var, which is surprising and leads to subtle quirks:
- setenv(var, "") is specified by POSIX to set var to an empty string,
but barebox uses it to delete variables
- nv.user= calls nv_set with NULL parameter, but nv user="" doesn't
Make the API more POSIX-like by providing unsetenv with the expected
semantics. Most user code can then use unsetenv without worrying about
whether "" or NULL is the magic deletion value.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
| -rw-r--r-- | commands/readlink.c | 2 | ||||
| -rw-r--r-- | commands/setenv.c | 7 | ||||
| -rw-r--r-- | fs/fs.c | 2 | ||||
| -rw-r--r-- | include/environment.h | 5 | ||||
| -rw-r--r-- | net/ifup.c | 2 |
5 files changed, 14 insertions, 4 deletions
diff --git a/commands/readlink.c b/commands/readlink.c index fdcf175f56..81ad25c733 100644 --- a/commands/readlink.c +++ b/commands/readlink.c @@ -50,7 +50,7 @@ static int do_readlink(int argc, char *argv[]) return 0; err: - setenv(argv[optind + 1], ""); + unsetenv(argv[optind + 1]); return 1; } diff --git a/commands/setenv.c b/commands/setenv.c index ad26770655..6992f604f5 100644 --- a/commands/setenv.c +++ b/commands/setenv.c @@ -10,6 +10,7 @@ static int do_setenv(int argc, char *argv[]) { char *equal; + int ret; if (argc < 2) return COMMAND_ERROR_USAGE; @@ -21,8 +22,12 @@ static int do_setenv(int argc, char *argv[]) argv[2] = &equal[1]; } + if (argv[2]) + ret = setenv(argv[1], argv[2]); + else + ret = unsetenv(argv[1]); - return setenv(argv[1], argv[2]) ? COMMAND_ERROR : COMMAND_SUCCESS; + return ret ? COMMAND_ERROR : COMMAND_SUCCESS; } BAREBOX_CMD_HELP_START(setenv) @@ -3066,7 +3066,7 @@ static int automount_mount(struct dentry *dentry) setenv("automount_path", am->path); export("automount_path"); ret = run_command(am->cmd); - setenv("automount_path", NULL); + unsetenv("automount_path"); if (ret) { printf("running automount command '%s' failed\n", diff --git a/include/environment.h b/include/environment.h index 9488e4e1ac..19e522cfb6 100644 --- a/include/environment.h +++ b/include/environment.h @@ -87,6 +87,11 @@ int env_push_context(void); int export(const char *); +static inline int unsetenv(const char *var) +{ + return setenv(var, NULL); +} + #endif /* _ENVIRONMENT_H_ */ /** diff --git a/net/ifup.c b/net/ifup.c index a74037939b..1870f74017 100644 --- a/net/ifup.c +++ b/net/ifup.c @@ -86,7 +86,7 @@ static int source_env_network(struct eth_device *edev) env_push_context(); for (i = 0; i < ARRAY_SIZE(vars); i++) - setenv(vars[i], ""); + unsetenv(vars[i]); cmd = basprintf("source /env/network/%s", edev->devname); ret = run_command(cmd); |