machinectl: show /etc/os-release information of container in status output

2 files changed, 120 insertions, 35 deletions

diff --git a/src/shared/fileio.c b/src/shared/fileio.c
index c5806249f6..fb1c1bcf9f 100644
--- a/src/shared/fileio.c
+++ b/src/shared/fileio.c
@@ -27,8 +27,12 @@
 #include "utf8.h"
 #include "ctype.h"
 
-int write_string_to_file(FILE *f, const char *line) {
+int write_string_stream(FILE *f, const char *line) {
+        assert(f);
+        assert(line);
+
         errno = 0;
+
         fputs(line, f);
         if (!endswith(line, "\n"))
                 fputc('\n', f);
@@ -51,7 +55,7 @@ int write_string_file(const char *fn, const char *line) {
         if (!f)
                 return -errno;
 
-        return write_string_to_file(f, line);
+        return write_string_stream(f, line);
 }
 
 int write_string_file_atomic(const char *fn, const char *line) {
@@ -189,29 +193,33 @@ ssize_t sendfile_full(int out_fd, const char *fn) {
         return (ssize_t) l;
 }
 
-int read_full_file(const char *fn, char **contents, size_t *size) {
-        _cleanup_fclose_ FILE *f = NULL;
+int read_full_stream(FILE *f, char **contents, size_t *size) {
         size_t n, l;
         _cleanup_free_ char *buf = NULL;
         struct stat st;
 
-        assert(fn);
+        assert(f);
         assert(contents);
 
-        f = fopen(fn, "re");
-        if (!f)
-                return -errno;
-
         if (fstat(fileno(f), &st) < 0)
                 return -errno;
 
-        /* Safety check */
-        if (st.st_size > 4*1024*1024)
-                return -E2BIG;
+        n = LINE_MAX;
 
-        n = st.st_size > 0 ? st.st_size : LINE_MAX;
-        l = 0;
+        if (S_ISREG(st.st_mode)) {
+
+                /* Safety check */
+                if (st.st_size > 4*1024*1024)
+                        return -E2BIG;
+
+                /* Start with the right file size, but be prepared for
+                 * files from /proc which generally report a file size
+                 * of 0 */
+                if (st.st_size > 0)
+                        n = st.st_size;
+        }
 
+        l = 0;
         for (;;) {
                 char *t;
                 size_t k;
@@ -248,7 +256,21 @@ int read_full_file(const char *fn, char **contents, size_t *size) {
         return 0;
 }
 
+int read_full_file(const char *fn, char **contents, size_t *size) {
+        _cleanup_fclose_ FILE *f = NULL;
+
+        assert(fn);
+        assert(contents);
+
+        f = fopen(fn, "re");
+        if (!f)
+                return -errno;
+
+        return read_full_stream(f, contents, size);
+}
+
 static int parse_env_file_internal(
+                FILE *f,
                 const char *fname,
                 const char *newline,
                 int (*push) (const char *filename, unsigned line,
@@ -275,10 +297,12 @@ static int parse_env_file_internal(
                 COMMENT_ESCAPE
         } state = PRE_KEY;
 
-        assert(fname);
         assert(newline);
 
-        r = read_full_file(fname, &contents, NULL);
+        if (f)
+                r = read_full_stream(f, &contents, NULL);
+        else
+                r = read_full_file(fname, &contents, NULL);
         if (r < 0)
                 return r;
 
@@ -532,25 +556,27 @@ fail:
         return r;
 }
 
-static int parse_env_file_push(const char *filename, unsigned line,
-                               const char *key, char *value, void *userdata) {
+static int parse_env_file_push(
+                const char *filename, unsigned line,
+                const char *key, char *value,
+                void *userdata) {
 
         const char *k;
         va_list aq, *ap = userdata;
 
         if (!utf8_is_valid(key)) {
-                _cleanup_free_ char *p = utf8_escape_invalid(key);
+                _cleanup_free_ char *p;
 
-                log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.",
-                          filename, line, p);
+                p = utf8_escape_invalid(key);
+                log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p);
                 return -EINVAL;
         }
 
         if (value && !utf8_is_valid(value)) {
-                _cleanup_free_ char *p = utf8_escape_invalid(value);
+                _cleanup_free_ char *p;
 
-                log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.",
-                          filename, line, key, p);
+                p = utf8_escape_invalid(value);
+                log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p);
                 return -EINVAL;
         }
 
@@ -571,6 +597,7 @@ static int parse_env_file_push(const char *filename, unsigned line,
 
         va_end(aq);
         free(value);
+
         return 0;
 }
 
@@ -585,14 +612,16 @@ int parse_env_file(
                 newline = NEWLINE;
 
         va_start(ap, newline);
-        r = parse_env_file_internal(fname, newline, parse_env_file_push, &ap);
+        r = parse_env_file_internal(NULL, fname, newline, parse_env_file_push, &ap);
         va_end(ap);
 
         return r;
 }
 
-static int load_env_file_push(const char *filename, unsigned line,
-                              const char *key, char *value, void *userdata) {
+static int load_env_file_push(
+                const char *filename, unsigned line,
+                const char *key, char *value,
+                void *userdata) {
         char ***m = userdata;
         char *p;
         int r;
@@ -600,16 +629,14 @@ static int load_env_file_push(const char *filename, unsigned line,
         if (!utf8_is_valid(key)) {
                 _cleanup_free_ char *t = utf8_escape_invalid(key);
 
-                log_error("%s:%u: invalid UTF-8 for key '%s', ignoring.",
-                          filename, line, t);
+                log_error("%s:%u: invalid UTF-8 for key '%s', ignoring.", strna(filename), line, t);
                 return -EINVAL;
         }
 
         if (value && !utf8_is_valid(value)) {
                 _cleanup_free_ char *t = utf8_escape_invalid(value);
 
-                log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.",
-                          filename, line, key, t);
+                log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, t);
                 return -EINVAL;
         }
 
@@ -625,14 +652,69 @@ static int load_env_file_push(const char *filename, unsigned line,
         return 0;
 }
 
-int load_env_file(const char *fname, const char *newline, char ***rl) {
+int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) {
+        char **m = NULL;
+        int r;
+
+        if (!newline)
+                newline = NEWLINE;
+
+        r = parse_env_file_internal(f, fname, newline, load_env_file_push, &m);
+        if (r < 0) {
+                strv_free(m);
+                return r;
+        }
+
+        *rl = m;
+        return 0;
+}
+
+static int load_env_file_push_pairs(
+                const char *filename, unsigned line,
+                const char *key, char *value,
+                void *userdata) {
+        char ***m = userdata;
+        int r;
+
+        if (!utf8_is_valid(key)) {
+                _cleanup_free_ char *t = utf8_escape_invalid(key);
+
+                log_error("%s:%u: invalid UTF-8 for key '%s', ignoring.", strna(filename), line, t);
+                return -EINVAL;
+        }
+
+        if (value && !utf8_is_valid(value)) {
+                _cleanup_free_ char *t = utf8_escape_invalid(value);
+
+                log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, t);
+                return -EINVAL;
+        }
+
+        r = strv_extend(m, key);
+        if (r < 0)
+                return -ENOMEM;
+
+        if (!value) {
+                r = strv_extend(m, "");
+                if (r < 0)
+                        return -ENOMEM;
+        } else {
+                r = strv_push(m, value);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+int load_env_file_pairs(FILE *f, const char *fname, const char *newline, char ***rl) {
         char **m = NULL;
         int r;
 
         if (!newline)
                 newline = NEWLINE;
 
-        r = parse_env_file_internal(fname, newline, load_env_file_push, &m);
+        r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m);
         if (r < 0) {
                 strv_free(m);
                 return r;
diff --git a/src/shared/fileio.h b/src/shared/fileio.h
index 06c2887157..5122a9a4de 100644
--- a/src/shared/fileio.h
+++ b/src/shared/fileio.h
@@ -25,16 +25,19 @@
 
 #include "macro.h"
 
-int write_string_to_file(FILE *f, const char *line);
+int write_string_stream(FILE *f, const char *line);
 int write_string_file(const char *fn, const char *line);
 int write_string_file_atomic(const char *fn, const char *line);
 
 int read_one_line_file(const char *fn, char **line);
 int read_full_file(const char *fn, char **contents, size_t *size);
+int read_full_stream(FILE *f, char **contents, size_t *size);
 ssize_t sendfile_full(int out_fd, const char *fn);
 
 int parse_env_file(const char *fname, const char *separator, ...) _sentinel_;
-int load_env_file(const char *fname, const char *separator, char ***l);
+int load_env_file(FILE *f, const char *fname, const char *separator, char ***l);
+int load_env_file_pairs(FILE *f, const char *fname, const char *separator, char ***l);
+
 int write_env_file(const char *fname, char **l);
 
 int executable_is_script(const char *path, char **interpreter);